How many amp hours is that?

One of the most common questions I get, and for good reason, people want to compare traditional lead-acid with lithium. The simple answer is Watt Hours/Volts=Amp Hours. Unfortunately as you drain your battery, volts drops, and as the voltage drops, loads begin to draw more amps. Furthermore you can expect to access only about half of what a typical lead acids stated capacity is. The best way to measure your battery capacity is with a shunt, that will keep track of the watt hours your loads are pulling as you drain the battery.