You want a solar panel that will charge your battery in 10 peak sun hours. Let’s say you have a 12V 100Ah lead acid battery and a PWM charge controller in your campervan. Once you’ve entered the above info, click “Calculate Solar Panel Size” to get an estimate of what size panel you need to charge your 12V battery at your desired speed. Desired Charge Time (in peak sun hours): How quickly do you want your solar panel to charge your battery, in peak sun hours?.Solar Charge Controller Type: Will you be using a PWM or MPPT solar charge controller?.Battery Depth of Discharge (DoD): What level of discharge is your battery at? 100% means fully discharged and 0% means fully charged.Battery Type: Is your battery a lead acid or lithium (LiFePO4) battery?.Battery Amp Hours (Ah): What is your battery’s capacity in amp hours? (If you only know its capacity in watt hours, first convert watt hours to amp hours).Battery Voltage (V): What is your battery’s voltage? We’ve gone ahead and entered 12 volts already, but you can always change it if your battery has a different voltage. To find out what size solar panel you need to charge your 12V battery, you’ll need to enter the following info into our solar panel size calculator at the top of this page: What Size Solar Panel to Charge 12V Battery?
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