Looking for a a basic formula
Hairfarm
Solar Expert Posts: 225 ✭✭✭
Greetings,
What is the basic formula that will allow me to convert AC watts into DC amps?
In other words, if a load can potentially draw 2000 watts max from my inverter, then how many DC amps is the inverter pulling from my battery bank?
What is the formula for that?
I couldn't find this anywhere in my notes that I've taken from this forum over the last few days.
thanks,
What is the basic formula that will allow me to convert AC watts into DC amps?
In other words, if a load can potentially draw 2000 watts max from my inverter, then how many DC amps is the inverter pulling from my battery bank?
What is the formula for that?
I couldn't find this anywhere in my notes that I've taken from this forum over the last few days.
thanks,
Comments
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Re: Looking for a a basic formula
Here is what I do... I will use "real numbers"--Just substitute your values:- 2,000 Watt * 1/0.85 Inverter eff * 1/10.5 volt batt cutoff * 1.25 NEC Derating = 280 Amp circuit/fuse/breaker minimum
If you just want the amps at any typical value:- Power = Watts = Volts * Amps
- Amps = Watts / DC Volts
But, of course, inverters have losses (around 85% is a good number), the inverter will draw more than its loads:- Amps = Watts * 1/eff * 1/DC Volts
- 2,000 watts * 1/0.85 inverter eff * 1/12.2 volts = 193 amps at nominal battery voltage and inverter efficiency
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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