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Camper Van Battery Size Calculator (For 12V Systems)
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Device NamePower (W)Device QuantityHours Used Per DayWatt Hours (Wh) per dayAmp Hours (Ah) per dayNotesColor Code
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LED Lights368.515312.8Cells shaded in GREEN are for you to fill in. DO NOT edit the code in the YELLOW cells.

1. Device Name: Enter Each Device In Your Camper Van.
We already filled some devices as an example. You can add more or delete as you need.

2. Power (W): Enter Operating Wattage Of Each Device.
The wattage can be found on the product's box, manual, or online page. The pre-filled numbers are an example, you can change the wattage number based on your products.

3. Device Quantity: Enter Number Of Devices In Your Van.
For example, if you have 12 LED lights, enter 12. If you have two smartphones, enter 2.

4. Hours Used Per Day

For example, if you use LED lights for 8.5 hours per day, enter the number 8.5. If you only use the hair dryer for 6 minutes/day, enter the formula: =6/60

5. Go To Part 2
Once you have sized your battery bank, go to part 2 (next tab) to build your solar system.
You Fill In
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Vent Fan3120605Auto Generated
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12V Fridge (see note)551633027.5
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Smartphone1222484
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Laptops652226021.7
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Water Pump5710.528.52.4
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Diesel Heater2013605.0
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Inverter Only1515.2578.86.6
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Blender24010.0500012.01.00
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Instant Pot75010.1667125.010.4
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Hair Dryer80010.180.06.7
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0.00.0
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0.00.0
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0.00.0
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0.00.0
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0.00.0
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Daily Energy Usage:103Ah
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Recommended MINIMUM Battery Size:AGM Battery:412Ah
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Lithium Battery:206AhFor A Step-Step Battery Size Calculation Guide:Click Here
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Recommended MINIMUM Solar Wattage*
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Battery Type:AGM or Lithium
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Total Watts:206W
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*go to Part 2 in next tab for our solar system calculator
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