![]() To support 150 amp hours of battery power, 300 amp hours of battery capacity is required. Note – if this 150 amps is drawn from the battery for one hour, 150 amp hours (AH) of battery power will be used. This is the DC current the inverter will use to operate the 1500 watt load. Formula: 12 volt inverters require approximately one (1) amp of DC input for each 10 watts of AC output.Įxample: How many DC amps will a Vanner 12 volt inverter require to operate three 500 watt quartz lights, or a 1500 watt electric heater?Ģ) 1500 watts/10 (from formula) = 150 amps.Since the calculations yield approximate values, an appropriate safety factor should be considered when designing and specifying system components, such as wire size and length. This “Rule of Thumb” is intended as a general guide for estimating the DC amps required to operate a DC to AC inverter. ![]() Formulas and Examples for 12 & 24 Volt DC Systems
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