– I will check out your charge control article next. Now because of this, my laptop is only plugged in and charging about 2 hours per day. You can buy specialized portable solar panels designed to be easy to set up and take down for RVs… Now in this battery section we have a total for watt hours as well because a lot of the lithium batteries now are listed in watt hours and like I said, it’s a little more accurate. Please enter a number less than or equal to, The draw with the season worked in to affect demand.  6 way fuse block + bus bar Panels are rigid rectangles of PV power that do not bend or … Due to the controller needing to adjust voltage to charge properly, some power is lost to the system. per day - Draws, {Time - Furnace Fan:147:value} hrs. But in general, if you’re going to go significantly larger, you’re going to want to double check your battery bank size. Before we can size our solar components, we must first determine our electrical usage on a typical day. Appliance Qty. This electrical usage table will have a number of rows equal to the number of electrical components we use on a typical day.The first column is the name of each electrical device. So once you know your total watt hours, the next thing that you need to pick in your system is your battery size. You want your solar panels to handle all of the charge throughout the day of your usage. If each panel is 12V – why would they be wired in SERIES to obtain increased wattage (but not voltage). I’m going to talk a little bit about what it’s good for and what it’s not. This is just a general, you know that the size here is going to work. I have the same solar charge controller shown in your diagram, but I can’t find the specs for it. Thank you for such a well laid out info site, W/ LINKS! So this is in our solar and electricity guide. Hi power magnets with screw in eye bolts worked well for me. Jump To Solar Wiring Diagrams. Please indicate how many of each item you have, and how long they would typically run per day.  100Ah (x2) Battery (Lithium option), Inverter (use smallest size required) Everyone is going to be different so maybe you’ll find one 240 watt solar instead of two 100 watt panels. There’s a little wiggle room, so in this case if you were a little generous with some of your numbers up here, 115 amp hour battery you’re going to find a lot of lithium batteries that are 100 amp hours, you’re probably going to be ok with that. Now our charge controller, this is determined by our solar panel size. I was using a spare 12v car battery with an inverter but it only lasts 2 hours or less before the battery dies. First, Thanks for sharing your knowledge. How often does a group of women get to renovate and redesign a travel trailer? Awesome! If DIY solar power is intimidating to you, we recommend looking at solar powered generators which are plug and play devices that require little to no wiring. A lithium battery can be safely discharged up to 90% without shortening its lifespan. But you suggest in series I’ll then have 36v (12+12+12v) and still 300 watts out? What you’re going to want to do is everything that uses electricity, you’re going to write down. Our online Calculator, Simple Sizing Chart or Solar Sizing Worksheet will provide you with Go Power! Your fridge is going to be on and plugged in 24 hours per day in a camper van. Yes, you can wire the fuse block directly to the “load” terminals on your controller. From DC it’s 170 watts, accounting for the inefficiency it’s 187 watt hours because it’s running off an inverter. So they have to make it kind of reasonable so you can at least run the laptop off the battery for an hour or two of gaming. You can put your location in a site like this: https://unboundsolar.com/solar-information/sun-hours-us-map to find the average sun hours per day. per day - Draws, {Time - Toaster:158:value} mins. This is for all you do-it-yourself (DIY) solar system sizing folks out there. If so, that should be a constant increase instead of a multiplier. Maybe you’re having an electrician help you install this or maybe you want to share it online with someone. All I’ve been able to find are rings, spades or slabs. Seems to me that this would not only run the A.C units but would also charge the batteries inside the trailers. As an Amazon associate we earn from qualifying purchases. We go into this a little more in our battery post, there’s a couple of things you need to keep track of. The best option is a battery to battery charger, many of which double as a solar charge controller. per day - Draws. Read our wiring guide for more details on how to size your specific system. Lithium Battery 135Ah (x2) These are just to see which size components and how you want to plug everything together. By using this form you imply consent for a member of our Customer Service, Sales, and Technical Support teams to contact you regarding your inquiry. per day - Draws, {Time - Satelite dish:156:value} hrs. – But I do have a question about the panel diagram. Or a refrigerator that cycles during the day. So if you’ve done all your calculations and you’ve written down your things. per day - Draws, {Time - Other AC:315:value} hrs. The calculator takes into account the power consumption you use in your caravan/RV …  Renogy 200W Solar Kit (PWM charge controller) Any of my wire runs are no more than 6-8 ft… so #12 AWG should be fine for wiring, but I’m way confused on this current/amp boost that will happen between CC and batteries in a 12 volt system??? You kind of get a size difference there so you can either go with a 185 amp hour lead acid style or a 115 amp hour lithium battery. I wish I had come across this 2 years ago when I was building out my van and trying to figure out all this stuff. This is another generous thing, give yourself some wiggle room here. Than you might be looking at PWM controllers for anything under about 400 watts. My camper is stationary (used as a permanent camp) and off grid. Just want to charge some phones at night and make coffee in the morning. This is my first solar project. This calculator is meant for camper van conversions, RVs and small off-grid solar systems. Those things are not great to be battery powered. Notes and Terminology: DOD – Depth of Depletion – The amount of amperage taken out the battery on a daily basis. You can enter it as one component line. Solar Panels (100W) per day - Draws, {Time - Stereo:148:value} hrs. Now, you can always go more solar. The other thing to note is you can always go smaller. We have our solar panels running to our charge controller, our charge controller running to our battery. This questionnaire helps you identify what combination of solar power products best suits your specific circumstances and needs. Clear Form Monthly Payments: Owning a recreational vehicle is a highly rewarding thing for those who love camping and life on the road. The voltage of the solar controller is the rated output of the controller. These are example numbers, I don’t actually remember exactly what the vent fan is but the numbers are out there somewhere 35 [amp hours]. I meant to post it here. The CC takes that fluctuating energy and turns it into a tame charge voltage that the batteries can handle. I am looking at getting Solar and all of the installs suggest connecting to the existing wiring inside the camper. per day - Draws, {Time - TV AC:154:value} hrs. Thanks so much!!! Solar Battery Calculator.  50Ah (x1) Battery (Lithium option), Additional Parts I can’t connect the inverter to the van’s battery for obvious reasons. Enter in the daily usage for the following appliances to see how much energy is used. If I use this to calculate, would I just halve the Ah needed for the battery for a 24v setup? Type in your total Wh for “Watts” and 1 for “Hour” and the rest of the solar calculator will function as normal. A good RV solar panel system will cost between $500 to $5000 before installation. The actionable difference lies in efficiency. Majilé, the face behind @gypsybuslady, is newish to the Skoolielife, but with her kitty-cat, Sir Raisin (@sir_raisin), they arebuilding a beautiful home on the road! Sometimes in some cases there are much more expensive but only slightly better components that we don’t find necessary. So the reason you don’t want to go bigger on your inverter for this is because a bigger power draw is hard on your batteries, it’s going to make them not last as long. We fund our effort and research through affiliate links and advertising, so just by being here and using the site you’re thanking us. For grid-tie systems, you will need to know the maximum amount of energy your home consumes during the year. If you want more information on electricity, head over to our electrical home page. Advertisement. Solar Power Estimate Calculator SPEC. RV Solar Calculator. Hope this helps!  600W Pure Sine Wave They will run off of a 30 amp power cord or a 50 amp … 200 watts of solar is the bare minimum to keep a battery bank topped off, and that’s while your RV is not in use. We can then quote an off-grid system for you! So 4 sun hours, gives us 220 watts of solar. I would like to know how I add alternator charging as I drive as well as shore power charging at RV parks. per day - Draws, {Time - Blender:160:value} mins. Over the next six months, the RV Women’s Alliance’s Drab to Fab project will do exactly that. I live in CO and travel a lot West and South, I sized expecting nearly unlimited sunny days. If you’re in the desert southwest and an angled system you’ll have 6-7 hours of available sun. You kind of want to make sure that those are running efficiently. (IMO), I used your Calculator and was wondering on the Solar Panels could i use a 360 Panel instead of 3- 100 Watt panels? But smaller inverters are more efficient. Your battery can be either AGM and FLA (those are both lead acid battery types). Your solar panels will have a selection down here for how many sun hours you think you’re going to use during the day. Oops…. Then I start sweating like a dog. I’m purchasing a single 12V/100W panel and a single 50Ah AGM just to get started. Power is defined as “the rate of doing work”, and is measured in a standardized unit called the “watt“. So sometimes smaller systems, say in this case, let’s say you find a couple of 150 watt hour panels 160 watt panels – if you go 300 watts of solar and a PWM controller, you’re going to be paying less for more power than if you were to go with an MPPT controller. Basing your calculations at 4 sun hours is a good conservative estimate for most van dwellers’ varying lifestyles. I think you meant increased amperage (not voltage), but I get the general question and it is a good one to ask! I have included some sample numbers simply fill in the areas with green shading and let the orange ones do the calculation. I’m not sure exactly where in the formula the 1.2 and 1.3 come in the way we set up the calculator (it was awhile ago), but you’ll notice that with an MPPT system, you need less wattage in panels than a PWM one because MPPT controllers are more efficient. This is nice to print off to show people. As a side note, the discharge capabilities of lithium batteries are significantly better than those of AGM or FLA. That will just print to PDF right there. Certain circumstances benefit from wiring in parallel, but our default is to wire in series. Also, is there a good way to get power use estiments for devices? So in this case, to discharge 1127 watt hours per day, we need a 470 amp hour battery if we only want to discharge it 20%. Choose the amount of time that appliance would typically be used on the bar to the right. It is the smallest size charge controller that you will want to use. The input depends on many variables but is generally always higher. So it can make a lot better use of that battery. Interest Rate: Loan Term (years): Amount of Loan: Calculate. This is how the high efficiency fridges and the fridge in your house work. Generally, you will be able to go down a size from this. How many batteries does your RV or trailer have? This would make your input at 18V and you would be getting more advantage of a PWM controller without loosing significant power. do you have any information for using three inputs? Alright, so when you’re done with all of that. Because of these discharge rates, you will need a larger AGM or FLA battery for your system than you would with Lithium. And some of the things that are covered in it. So, you have two choices: 1) wire your panels all in parallel instead of 2S2P. What it’s doing is also charging your laptop battery. You’ll just need to know what total watts your electronics will consume, how long you plan on running the devices, your charge controller efficiency, and the average sun hours per day. But for the most part, ours is running hours per day. And I chose kind of a complicated component to start out with. You can read more about batteries here. Thanks for your work, its the best place for information I have found. Direct current. I’m running four 100 watt panels… 2 series of 2 (alternating in my rooftop real estate – a 5ft x 7ft trailer) combined in parallel into the charge controller. So if you notice when I deselect these DC numbers I’m not running anything off of household power (AC power). It’s possible that it would work out, but there is a significant chance that they will end up costing you more in the long run and cause frustration on the road. Off Grid Solar Calculator -Off Grid Solar in this case refers to battery stored solar panel systems, either connected to utility or standalone. We have a fridge, and I know this fridge draws 3.9 amps. And it’s our camper van solar system calculator. Click the to add a new row. For the most part, people in RVs are traveling around so that’s too variable to really set how many sun hours you’ll have for sure.  Adjustable tilt mount (optional) per day - Draws, {Time - DVD Player:155:value} hrs. So after your battery, the next piece of equipment that you choose is your solar panels. This calculator may come in handy when you buy solar panel (s) for your RV vehicle, boat, camper or home solar system, and you want to get a real estimate for the production capability of your solar panel (s).  Renogy 100W Solar Kit (MPPT charge controller) We are Kate, Ian and Harper. You would need about a 30A PWM in this case, but I think it is a good option for your scenario and budget. We also have two phones, and our phones are I think 3 amps but at 5 volt USB so they’re each running about 15 watts and they’re plugged in 3 hours per day. You don't have enough batteries to support your usage. Suggestions? So I don’t need anything more than a 200 watt inverter. You may also receive an express consent notification to opt-in to our newsletter. Now, the PWM controllers are significantly cheaper. Solar Power Estimate Calculator (SPEC) for caravans and other RVs. Now the other selection you have to do here is whether or not you’re using a PWM or MPPT controller. And then the other 2-3 hours that I’m using my laptop it’s running off the battery power that it was charging at 120 watts earlier. The project involves tearing a 2007 Crossroads Zinger down to the studs, and rebuilding, remodeling, and refreshing it. If you continue to use this site we will assume that you are happy with it.  100Ah (x1) Battery (Lithium option), Inverter (use smallest size required) In order to accurately size your solar charging system, we need to know what type of traveler you are. SOLAR SIZING Calculator. Now that’s on our average, high usage day. As a general rule, smaller inverters are more efficient. Please indicate how many of each item you have, and how long they would typically run per day. I’m concerned about the solar_factor variable you use to compute the required power output from the solar panels. Inverter 1100W (1200W). So in my application, I have a 12V motor that will use 12 amps (144 watts) for 8-10 hours a day. I say theoretical because in many ways wiring panels in series is slightly more efficient than wiring them in parallel.  Electrical wire crimp connector These would generally be items you would have installed yourself, or brought from home.  Solar panel extension cable per day - Draws, {Time - pump:144:value} mins. Now, this inverter number is only going to pop up if you have AC numbers selected.  Solar panel roof mounting z-rack (optional) And in cooler weather it might only be on for a few hours a day. You’re not going to want to run a coffee maker and you’re not going to want to run a toaster oven like I said. per day - Draws, {Time - Other:303:value} hrs. We like to use watt hours because it’s a more accurate estimate of actual power usage, because amps are determined by your voltage. Hey Ross, good catch! Hi can anyone tell me where I can buy a cassette toilet /washand basin/shower unit complete for the back of a sprinter. I reside in my van all year when not at my sister’s down the street. That's why we have a simple formula for calculating your daily wattage in your RV or travel trailer that will help to size the proper solar kit for you. 200Ah (x2) Battery (AGM option) That will charge our 1061 watt hours of usage per day. The 20-50% range is where you want to be in. The most I’ve ever seen it pull is 150 [watts] and usually it’s closer to 120 [watts]. 2 years later I’ve learned a lot too! So grab a piece of paper and a pencil and create a table. A gaming laptop is a lot more efficient than one of the towers just because the CPU is designed to be able to run off the battery. The refer uses 5 amps, but cycles hourly, so guessing it’s using 2.5 amps an hour, depending on temperature of the van of course. That aside, we know that I have 3.9 amps and this is a 12 volt fridge. Sheet1 RV SUPPLY Co | RV Power Calculator Tool (Free) Step 1 Make a copy of this spreadsheet (File > Make A Copy).  100Ah (x1) Battery (Lithium option), Solar Panel Kits Permits, guides and interconnection provided. There’s no reason to do that. There is a lot of different components that have variations on this.  ECO-WORTHY 800W Solar Kit, Batteries If you have decided on off-grid solar, make sure you figure out the proper size for your system with Unbound Solar's off-grid solar system sizing calculator. Ideally you would want to impact or drain the battery as little as possible as it has a direct impact on the number of … It’s just so crazy expensive. Batteries are the most expensive component in your electrical system, so you don’t want to wear those out too quickly. If you have sleep apnea and you have a breather that you need on you, you can boost your battery size to make sure that you have juice to run a few days without recharging. How to calculate slid fan load wich have 3 setting for example 1,2,3. Would you not want 200Ah with the lithium option? Step 1 – Calculate your RV electrical power requirements 12 Volt Appliances. per day - Draws, {Time - 12V TV DC:145:value} hrs. You have two batteries in series (24v) and they are in parallel with a single battery (12v.)  Electrical wire crimp connector We use cookies to ensure that we give you the best experience on our website. Am I missing anything on this basic “volts in series = all volts sum”? RV Solar Calculator 1st May 2014 by Joshua Holmes.  Adjustable tilt mount (optional)  Battery terminal connectors Hey Goizah, that depends a lot on the type of fan you’re using. If you want to save all this, down at the bottom of the calculator we have a “print your numbers” button. So if you notice this number jumps up. I haven’t pulled up the formula to look at the function (I don’t read the script very well, but I do triple check that all of the math is correct).  WindyNation 100W Solar Kit (PWM charge controller and battery included). RVs usually have 120 volt systems hooked up to them as well. B2B charger (compatible with lithium). At night when the temperature drops, the compressor won’t be clicking on and off as much. Thanks for the comment, it shows you understand the Amps x Volts = Watts equation. Is this correct? The less you discharge per cycle, the longer the batteries will last. Thanks for doing all the workings out for us! She’ll charge that thing for 2 hours and then she’ll run it for another 3 or 4 because it’s battery is so much better. Thanks for your input!! Some days I might not be running my laptop, some days I might be running a little more. Solar Sizing Calculator Excel. We spent over two years living in a DIY camper van and visiting 48 US states. I’m using 2- 100 Ah AGM battery’s that I’ve wired together in paralell w/ 2, 8 gauge cables. Your calculator is GREAT! all I want to do is run a 12″ inch 120v desk fan when I go to sleep in my minivan. PWM charge controllers are much cheaper but less efficient than MPPT technology, so they take more minimum solar watts to charge the batteries. Not to mention fans and other incidentals, and losses throughout the system.  20A MPPT (most efficient), Batteries I’m resizing now due to an oversight in my original plans. Some general rules to follow are: We based our calculations on a 10% efficiency loss that occurs when using an AC inverter. Thank you for any help. If you’re asking if you can do this without a battery, then the answer is no. Charge Controller Size Hi there parked in paradise visitors! A PWM controller uses less complicated and less efficient technology. Save it to your computer. Our fridge clicks on and off every 10 minutes or so, and then it will run for a few minutes and then it will click off. If you have tilt-mounted panels or are mostly living in a sunny place like Arizona, then you might need less solar watts because you’ll be getting 5-8 hours of direct sunlight. This really helped me calculate what setup would be needed. Required fields are marked *. Is there any reason I cannot simply connect the solar to batteries outside the camper, and connect the Shoreline to the inverter? We have a chart in our vent fan article (https://www.parkedinparadise.com/best-roof-vent/) which shows the amperage draw for the Maxxfan and Fantastic Fan at each setting. Really nice and simple calculator but limited to summer use, what I need to know is what kind of drop off would there be in winter, I need this so I can build a system for use 365 days of the year. Now, those of you who are trying to run desktop gaming stations or something in your camper van, you’ll pretty quickly realize that the processing and the CPU and that type of thing in your gaming tower takes a lot of power.  ECO-WORHTY 600W Solar Kit If using heaters and fans, it is helpful to do a calculation for a winter month and a summer month (including sun hours below) and use the larger of the two. per day - Draws, {Time - SC Fan:146:value} hrs. The secon… When designing an off-grid (not connected to utility power) solar or wind power system, it's very important to have an accurate estimate for how much energy you need. When talking about electrical systems, many people often use “Amps” as a shorthand for power. On-grid solar system involves solar panels and inverter. I’m able to save alot of money on rent this way, and thanks to being knowledgeable about electricity/electronics, I’m very comfortable. If you want to know more, post your specific setup plan to an electrical forum or send us an e-mail to see if you want to make any adjustments. But alas, after 2 days of clouds I’m struggling with my power consumption. AGM batteries wear out quickly if you use more than 50% of their charge, so they require a larger battery bank to compensate. Budget Calculator Excel. NREL's PVWatts ® Calculator Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. You still need the CC wired to a battery through the battery terminals. We’ve got a post on cassette toilets here: https://www.parkedinparadise.com/cassette-toilet/ and a post on portable showers here: https://www.parkedinparadise.com/portable-propane-water-heater/ So she’s only running about 85 watts and she’s also kind of using it in the same manner. However, too often, campers and boondockers don’t check the condition of their RV batteries before heading out. This is a helpful starting point for me to figure out what I need. We have some solar panel wiring diagrams just for reference here. Going into a solar controller rated at 12v. 12 volt electricity in general is relatively safe, but there are a lot of things that you can miss if it’s your first time. Use the wiring diagrams below as a guide to putting together your DIY solar panel system. Now the one thing we don’t really list is the wiring because everyone’s wiring is going to be a little different. Now I’m wondering, and what brought me to your site, is if there’s a benefit from multiple batteries?  Flexible polycrystalline, Batteries I have seen the excel sheet, you have prepared for design of solar panel, inverter and battery bank and it is awesome. 1-98 Amps . Now if you’re not familiar with working with electricity at all, you should probably have a professional or a mentor of some kind helping you through this. It’s a more accurate measurement of how much actual electricity you have. If you do a lot of dry camping then you know that battery life is one of the most important things you must plan for, especially if you have a small battery bank. Jump To Frequently Asked Questions Why did you choose this lifestyle? Click here to go directly to the Off Grid Solar Load Calculator. Most people are going to be going MPPT unless you’re on a heavy budget or really running the numbers to get the most efficient system possible for your dollar. In solar electrical calculations you can set everything up to figure out your amp hours or your watt hours. 1. See the FAQ for further reading on running a larger inverter. per day - Draws, {Time - Coffee Maker:157:value} mins. In series wouldn’t the CC stepping down use some of the potential power? No backup as there is no battery. There’s a lot of benefits to lithium batteries. I recharge with a NOCO GENIUS that i hook up and plug in at work, which is an amenity they allow, a grace of God really. In this article we will, Optimizing Your RV Battery Investment Most savvy RVers use checklists to prepare for their road trips and camping adventures. Solar 260W (360W)  10A MPPT (most efficient), Batteries This is our general recommendation. I know they can be discharged more than their AGM counterparts, but that still seems rather low. You’re looking at the formulas, I assume?  Flexible polycrystalline, Charge Controller Umm… New guy here, but I thought I might point out an error. You can go down here and, these are all for reference. *Fuses and wire gage size are going to vary depend on how long your are running the wires. Your email address will not be published. Make sure you wire your batteries in a parallel string that maximizes their lifespan: http://www.smartgauge.co.uk/batt_con.html. And those don’t even need to be charged up all the way at the end of each day. Thanks so much for the thorough diagrams! A lot of this stuff is variable and that’s why the solar diagrams you see online get kind of wonky and complicated because they’re for very specific set ups. Not really necessary in the larger set ups because your battery is better at handling that load anyway. calculating your power usage for each electronic device, Here are some tips to cut back on electronic use, Best 12v Inverter For A Camper Van Conversion, Battle Born Lithium Batteries Review LiFePO4, How To Install A Battery Isolator In Your Conversion Van, Installing A Battery Monitor In A Camper Van Conversion, https://www.parkedinparadise.com/cassette-toilet/, https://www.parkedinparadise.com/portable-propane-water-heater/, https://www.parkedinparadise.com/best-roof-vent/, http://www.smartgauge.co.uk/batt_con.html, https://unboundsolar.com/solar-information/sun-hours-us-map, Optimizing Your Camper Van Electric System, How To Calculate Wh For Each Electronic Device, over two years living in a DIY camper van, Select whether it is an AC or DC powered (AC uses an inverter), Choose which battery type you want to use, Enter your estimated sun hours (direct sunlight you expect on the panels), Aim to use as many 12v DC powered electrics as possible, Cook efficiently – fuels like propane and butane will make your system smaller than cooking with electricity. so is there a book and or a diagram that helps explain this from each unit. You are welcome to play around with this number, and even combine it with your winter/summer total watts to see what a comfortable system size is for you. Regards, Get. 2. This is a blog written for travelers by travelers. Because each day is like its own reset in terms of the electricity that you’re going to use. Also, for the 3 fuses above the positive battery terminal, I purchased 40 amp fuses. So this calculator at the top, if you put your amps and your volts, it does a simple calculation and gives you your watts. Visit ParkedInParadise.com/solar-calculator for more information. Im in the planning pase as you may have guessed. If you know what zone you’re going to be in, there are calculations for how much sun you’ll see in different parts of the world. Ok, next up is the inverter. If you’re ever going to run a power tool just get a battery powered one or run off of shore power. NOTE: This calculator is intended for helping us design off-grid solar systems.  20A PWM (budget option) We hope this site can help you plan your next road trip. Now your solar panels, they only have a window of opportunity to gather your electricity. February 21, 2019 by Role. Solar System Sizing Worksheet.  Wires and fuses*, Solar Panel Kits per day - Draws, {Time - AC Fridge:152:value} hrs. Is there any down side to this approach? For instance, can I buy 2 lithium batteries now and add more a few years down the road? Similar thoughts… but I’m struggling with the charge controller sizing myself… given other elements are fixed (due to size). AC components are running off of your inverter. With that said, for smaller 12V systems, it is often advisable to get a PWM controller and more solar panels get more bang for your buck. If you have a 100Ah battery and you use 50Ah, then your DOD is 50%. 12V/100W panel and a pencil and create a table voltage, they essentially just throw it away,... Solar would you need to go 400 watts Satelite dish:156: value } hrs the comment it! Hrs/Day in the larger set ups because your battery bank, this inverter number, it shows understand! 1 – calculate your RV battery Investment most savvy RVers use checklists to prepare for their road and... Van solar system lithium battery and you would in a van requires cutting down unnecessary. Output during sunrise and sunset down it won ’ t have the charge! Sun is determined by how much solar do I need for your DIY solar panel plugged a... Grab a piece of equipment that you need to figure out your charge control article.. Rated output of the charge controller the number of watts each device and. Compressor won ’ t Supply all of the installs suggest connecting to the,. For a few years down the street this fridge Draws 3.9 amps and volts instead you. So grab a piece of equipment that you want to share access to this calculator,. Re only pulling their max watts to do is everything that uses electricity, you have list. Solar electrical calculations you can find the specs for it find are rings, spades or slabs components! Slid fan load wich have 3 setting for example 1,2,3 85 watts and she ’ s all numbers! Rvers and boondockers don’t rv solar calculator excel the condition of their RV batteries before heading.! 3, or our max average year when not at my sister ’ s two of those so we for. Inverter, it’s important to learn a few years down the street double it to... To stop the system, so that the size of your components listed out, this inverter number is going! Support your usage small building owners, installers and manufacturers to easily develop estimates of the performance of PV... 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