The Ultimate Off-Grid Solar & Battery Runtime Calculator
Stop guessing how much off-grid power you really have. Whether you are sizing a LiFePO4 lithium battery or calculating AGM battery runtime, most DIY setups fail because they overlook critical “real-world” factors. This professional 12V off-grid solar calculator accounts for inverter efficiency loss, battery Depth of Discharge (DoD), and the 75% solar output rule to give you an accurate picture of your power needs. Use the tool below to calculate your daily Watt-hour (Wh) consumption, determine your required solar panel wattage, and find out exactly how many hours you need to drive to reach a full charge via DC-DC charging. Don’t get stranded with a flat battery—input your specs below to master your van life electrical system today.
⏱️ The Ultimate Battery Simulator
Daily Charging Sources
Select your AC-DC charger size. The generator powers the charger, which then safely charges the battery.
12V DC Appliances
240V/110V AC Appliances (+15% Inverter Loss)
Target Goal: —
Actual Runtime: —
The Breakdown: Your battery bank holds 0Wh of usable energy. You consume 0Wh per day (including inverter loss), and generate 0Wh per day via solar/generator. Your net power deficit is 0Wh per day.