per day - Draws, {Time - SC Fan:146:value} hrs. If we’re ok with discharging it up to 50% we can drop that down to a 185 amp hour battery. Choose the amount of time that appliance would typically be used on the bar to the right. Maybe I’ll get one that runs on a 90 watt power brick, and now all of a sudden my lithium battery isn’t quite as taxed by running that laptop.  Flexible polycrystalline, Batteries 2. We see this common mistake pretty often. 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. Jump To Frequently Asked Questions Cell booster. And then we have recommended components for those specific sizes. Generally, you will be able to go down a size from this. Also, is there a good way to get power use estiments for devices? Hey Ross, good catch! 2) Get a MPPT charge controller. And those are in series with the first battery. Go Power! We can then quote an off-grid system for you! Advertisement. Some days I might not be running my laptop, some days I might be running a little more. As you can see, if you run everything DC powered your efficiency is going to be higher in terms of how much power you’re getting out of that. This can also limit how much solar you can have on your motorhome or camper. And battery failure can lead to major headaches when you’re parked literally in, Not only was it a cool venture, but Majilé’s circumstances was such that it made sense, too!  Battery monitor (optional – basic) per day - Draws, {Time - CPAP:270:value} hrs. Visit ParkedInParadise.com/solar-calculator for more information. All rights reserved. Absolutely, and it is recommended to supplement any solar system unless you plan on driving infrequently. I was using a spare 12v car battery with an inverter but it only lasts 2 hours or less before the battery dies. How much Solar do I need for my RV? Battery life is affected by how quickly you are using power. Enter the quantity of each appliance by entering a value in the form field. Thinking if I have just 1 and it stops working for some reason, then I have no reserve. So in this case, I have two 90 watt DC powered components in my system. I can’t connect the inverter to the van’s battery for obvious reasons. February 21, 2019 by Role. Now one thing I forgot is the laptop and the Macbook are both running off of AC power. Oh that vent fan is on maybe 4 hours of the day, at night to cool the van off. The first thing that you need to figure out is all of the components that you’re using in your RV or camper van. So in this case, 100 watt, 12V panels in parallel will give: 12 v (12 to 18v) and 300 watts out total. 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%. If you’re in the desert southwest and an angled system you’ll have 6-7 hours of available sun. In this case we have a list set up and you can add and delete component lines.  Renogy 100W Solar Kit (MPPT charge controller) The voltage of the solar controller is the rated output of the controller. Say this number comes out to 25 amps, but you know your MPPT specs say that it can go to 240 watts and you only have 220 watts of solar, that charge controller can be a 20 amp charge controller. You kind of want to make sure that those are running efficiently.  Solar panel extension cable 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.  Battery isolator 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. 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