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A 3000W solar inverter converts 12V, 24V, or 48V DC power from your battery bank into standard 120V AC power that runs household appliances. The “3000W” rating refers to the continuous power output capacity, meaning it can safely deliver 3000 watts of power indefinitely under normal operating conditions.
With a 3000W inverter, you will usually draw much less than 3000W. For example, just running a TV would only draw about 70W. So work out what appliances you want to run and the total wattage of these devices to find your power draw. 3. Runtime Calculation Let's do some example calculations. The equation you need to use are as follows:
So to get more capacity you can hook up multiple batteries to an inverter. To work out how many batteries you need for a 3000 watt inverter you just need to know how many amps your inverter uses each hour. (The same equation as above: running Watts ÷ Volts = Inverter Amps). Then you just multiply your inverter amps by the runtime you need.
Let's say you have a 300Ah battery. 300 ÷ 250 = 1.2 hours. Drawing 3000 watts from a 300Ah battery will run for a maximum of 1.2 hours. If you reduce your power draw to 2000 watts, you would increase your runtime to nearly 2 hours! Remember, a 3000W inverter won't always draw maximum power, it depends what appliances you are running.
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