Now a lot of systems use amps just because that’s how 12 volt systems have always been measured in the past, and in vehicles it’s a good transition. 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! So this calculator at the top, if you put your amps and your volts, it does a simple calculation and gives you your watts. This section helps us identify how much power your DC appliances use in your RV or trailer. So in this case, 100 watt, 12V panels in parallel will give: 12 v (12 to 18v) and 300 watts out total. We like to use watt hours because it’s a more accurate estimate of actual power usage, because amps are determined by your voltage. Can you confirm that the wiring can be setup so that the fuse block / load can be wired directly through the controller? Estimated Watt Hours So this is just something to keep you aware. If you have things like toasters, if you have things like blenders, you’re going to see how quickly those things add up your electricity. Read our wiring post to determine the proper wire size for your build. First, Thanks for sharing your knowledge. Maybe you’ll say hey, maybe I want to trade in my laptop or before I buy a laptop I’ll get one that’s more efficient. If you want me to dig up the formula, let me know, it’ll just take some effort on my part. AC components are running off of your inverter. For batteries, my choice would be to scrap the old ones. From DC it’s 170 watts, accounting for the inefficiency it’s 187 watt hours because it’s running off an inverter. Is it to account for solar panel power output during sunrise and sunset? 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. per day - Draws, {Time - Cell Phone Charger:153:value} hrs. Enter number of Watts each device uses and your estimated max hours of use per day. And that thing is running about 5 hours per day. You can go down here and, these are all for reference. I’m WAY over powered as I only use 3 low wattage fans and recharge my tablet and phone. Not to mention fans and other incidentals, and losses throughout the system. I want to maintain the 70 C temperature of 50 liters (approx) water using 500 W DC heater for 24×7. If you have to run these, this inverter number is our general recommended max size based on your batteries. Along the way, we've met with other van lifers, checked out their rigs, and learned a lot about adventure travel. 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. per day - Draws, {Time - Stereo:148:value} hrs. The remodeled unit is set, For RVers and boondockers, microwaves and other off-grid appliances provide many creature comforts of home. Read our, Large Systems: Wiring Diagram (AGM Batteries), Large Systems: Wiring Diagram (Lithium Batteries). 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. Living in a van requires cutting down on unnecessary electronics as much as possible. Hi there parked in paradise visitors!  100Ah 12v (x4+) Lithium Battery. If you run an AC powered object like my laptop, then that efficiency is going to be reduced so you’re going to have to use more energy to charge the laptop than you would if it were DC powered. All I’ve been able to find are rings, spades or slabs. See below for details. I am planning to use 2 100W panels. The battery is essential for the system, not just to store energy but to create a balanced energy source (rather than the erratic energy that comes from the sun). So grab a piece of paper and a pencil and create a table. This seems to be the sweet spot for many RVers … So 4 sun hours, gives us 220 watts of solar. mobile power equipment recommendations based on your specific power usage.. At Go Power! Go bigger if you can with this, unless you don’t have enough roof space or if you’re on a significant budget. If you want to save all this, down at the bottom of the calculator we have a “print your numbers” button. These are the component sizes I’m going to go with. But if you’re twice daily using an 1800W induction burner, you’ll want a large battery bank to handle the heavy loads or else will be replacing your expensive batteries quickly. You can buy specialized portable solar panels designed to be easy to set up and take down for RVs… Free Solar Power Calculators. Over the next six months, the RV Women’s Alliance’s Drab to Fab project will do exactly that. We have a cool solar panel calculator on our site and i’m going to walk you through how to use it because there are a lot of steps involved and sometimes just seeing someone go through it helps quite a bit. RV Solar Calculator 1st May 2014 by Joshua Holmes. Now there are some cases where for off-grid and storage and stuff things change a little bit, but for an RV or a camper van this is a good starting point. 21 Gallery of Solar Sizing Calculator Excel. On-grid solar system involves solar panels and inverter. And those don’t even need to be charged up all the way at the end of each day. Again, we go through all of this on our charge controller post if you want to know details. It’s mostly plug and play and it’s pretty fun doing it on your own not only because you save some money and you can have a system sized exactly to what you need it, but it also helps you diagnose issues later down the road if you know what’s going on. Im guessing thats for the durration of use? I would then use the CC to step to the 12v needed to charge the battery. I am looking at getting Solar and all of the installs suggest connecting to the existing wiring inside the camper. Yes, this component can benefit from upsizing if you’re not sure if you’ll need more solar or not. Suggestions? I’m able to save alot of money on rent this way, and thanks to being knowledgeable about electricity/electronics, I’m very comfortable. Going smaller will be giving up power from your panels. If you don’t have any AC electronics you do not need an inverter, saving some money and efficiency. If you need a grid-tie or utility interactive system, please contact our office for a quotation. This is relative to how much total capacity the battery has, so larger batteries can discharge more quickly (hence a larger inverter). You don't have enough batteries to support your usage. per day - Draws, {Time - Propane Alarm:151:value} hrs. I can get the amps I want using 1, 2, 3, or more batteries. We go into this a little more in our battery post, there’s a couple of things you need to keep track of. We have our solar panels running to our charge controller, our charge controller running to our battery. Laptops are another variable component in that they’re only pulling their max watts. the system can recharge the batteries the rest of the day. Sometimes if you size down it won’t quite work for a few specific panels and that kind of thing. So, in this case we’ve got 220 watts. 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. Assuming we get 5 hours of direct sunlight, we know a 100 watt solar panel will produce 30 amp hours per day.. For our experiment, 5 hours of direct sunlight without clouds x 6 amps generated per hour = 30 amp hours per day that the solar … I have looked for 10 gauge ends to crimp onto the end of wire that will fit into the holes but have had no luck. It’s a really good quick reference for your camper van. That will just print to PDF right there.  100Ah (x1) Battery (Lithium option), Inverter (use smallest size required) 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. I say theoretical because in many ways wiring panels in series is slightly more efficient than wiring them in parallel. So once you have that all figured out, how do you put it all together? Thanks again. Maybe you’re having an electrician help you install this or maybe you want to share it online with someone.  Battery monitor (optional – premium) We want to share access to this amazing lifestyle with as many people as possible so this solar calculator is our contribution. But the main difference (as it relates to this calculator) is the depth of discharge – or DOD. 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. Also, is there a good way to get power use estiments for devices? 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. RVs … What the sun will provide: A 100 watt solar panel produces approximately 6 amps per hour in direct summer sun without clouds.. The actionable difference lies in efficiency. Then I start sweating like a dog. You kind of want to make sure that those are running efficiently. Different fridges run a little different. 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). I’m going to talk a little bit about what it’s good for and what it’s not. I have included some sample numbers simply fill in the areas with green shading and let the orange ones do the calculation. Basing your calculations at 4 sun hours is a good conservative estimate for most van dwellers’ varying lifestyles. Regards, Get. This is excellent. So as you’re picking one out it’s ok to look at the specifications on this. So, with that said, an MPPT charge controller has the ability to “convert” the extra voltage above that charge level to amperage, thus using as much energy as possible for charging the batteries. There’s two of those so we’ll say 6 hours per day. They will run off of a 30 amp power cord or a 50 amp … Our customer's unique systems are important to us at Outside Supply! An Unbound Renewable Energy Company Open Mon … Charge Controller And those are in series with the first battery. RV Loan Calculator. Now one thing I forgot is the laptop and the Macbook are both running off of AC power. Solar Sizing for Your RV. 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. And it’s our camper van solar system calculator. *Fuses and wire gage size are going to vary depend on how long your are running the wires. That inverter is going to come out blank. What time of year do you use the RV or trailer the most? Budget Calculator Excel.  Rigid Monocrystalline Try to cut back on induction burners, coffee makers, crockpots and other high-energy devices, Make sure you have the correct hours listed for your refrigerator and electronics. Learn more about RV batteries in our RV Solar Education series here, {Time - Light Bulbs:143} hrs. Thank you so much!  Battery monitor (optional) So in my application, I have a 12V motor that will use 12 amps (144 watts) for 8-10 hours a day. 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. I think that thing was pulling 2.9 [amps]. I have included a simple excel calculator to help you size up your system.  200Ah (x1) Battery (AGM option) The project involves tearing a 2007 Crossroads Zinger down to the studs, and rebuilding, remodeling, and refreshing it. There are a few different ways to arrange panels, batteries, and connectors. I might pick up a 400 watt inverter just because they’re easier to find, especially ones that plug into the batteries.  Solar panel extension cable Hi can anyone tell me where I can buy a cassette toilet /washand basin/shower unit complete for the back of a sprinter.  600W Pure Sine Wave  B2B charger (solar CC included, incompatible with lithium) A 100W solar panel plugged into a PWM controller will not be putting in 100W of power to your batteries. Buy panels direct and DIY or hire a contractor, saving thousands. Direct current. So, you have two choices: 1) wire your panels all in parallel instead of 2S2P.  Renogy 200W Solar Kit (MPPT charge controller) It’s just so crazy expensive. Now our charge controller, this is determined by our solar panel size.  20A PWM (budget option) Thinking if I have just 1 and it stops working for some reason, then I have no reserve. It is a DC powered fridge, so that means it’s plugging right into the DC electrical system. So once you have your battery, your power storage, you know your power storage can discharge a full day’s use, you can always boost that if you want. Step 1 – Calculate your RV electrical power requirements 12 Volt Appliances. But smaller inverters are more efficient.  1500W Pure Sine Wave, Additional Parts We have a fridge, and I know this fridge draws 3.9 amps. You might find that helpful. Certain circumstances benefit from wiring in parallel, but our default is to wire in series. 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. Solar, Alternator and shore power. But if it’s just charging the battery and I’m surfing the internet – 120 [watts]. Your batteries do need to be able to be charged all the way as well so you can’t get too big of a battery bank or else you’ll start losing some of the charging efficiencies and your solar won’t be able to charge up those last few steps. So they can’t supply all of that charge throughout the day like your batteries are going to be able to discharge. I have the same solar charge controller shown in your diagram, but I can’t find the specs for it. I find that to be a little redundant. 2) Get a MPPT charge controller. 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. If I have 3 and one stops working, I can re-wire in the field with the 2 remaining? We recommend reading our post on charge controllers for more information. These are just to see which size components and how you want to plug everything together. Say hey, here’s all my numbers, this is my daily power usage. 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. Timesheet Calculator Excel. So say we have this fuse box here, you’ll be able to jump in this list of all of the components. If you have a 100Ah battery and you use 50Ah, then your DOD is 50%. Yes! Oops…. This is based on your solar panel wattage. per day - Draws, {Time - Blender:160:value} mins. 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. We use cookies to ensure that we give you the best experience on our website.  Rigid Monocrystalline Lithium Battery 135Ah (x2) 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%. So that’s the amount of power that it needs. Similar thoughts… but I’m struggling with the charge controller sizing myself… given other elements are fixed (due to size).  Flexible polycrystalline, Solar Panel Kits 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. You’ll notice that changes your solar panel size calculation. By answering these simple questions, we can estimate the size of your system in a few moments.  10A MPPT (most efficient), Batteries If it is significantly lower than your needs, consider getting a larger battery bank to compensate.  Adjustable tilt mount (optional) Now I’m thinking scrap the [free] group 27 deep cycle battery with ~80 amp-hours capacity and just going with 3 (maybe 4) 35 amp-hour AGM in parallel (again a space issue – fitting “short” batteries under the frame). Due to the controller needing to adjust voltage to charge properly, some power is lost to the system. These diagrams are designed to be understood by a beginner for a safe and effective install with readily accessible components. Great site! NREL's PVWatts ® Calculator Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world.  75Ah (x1) Battery (AGM option) Than you might be looking at PWM controllers for anything under about 400 watts. 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