Im trying to find out how long a 916 Ah 48V battery bank can drift something that requires 47 kwh/ day. at 230V ?
Can anyone here tell me how to figure it out, or if it's even possible.
Thanks
Not sure what you mean by "can drift something" but if you mean "drive" or "power" then here's my guestimate at it - but I'm new to these kind of calculations so you might want to get these checked out by someone with more experience with battery banks...
47kWh/day is 1958.333Watts continuous. At 240v that's 8.160Amps continuous load. Assuming an inverter efficiency of 80% that's about a 10.2Amp draw on the batteries. So a 916Ah bank should last for around 90 hours without recharge.
Corrections to the above welcome - I want to learn how you folks calculate this!
That's close, but you forgot to convert the voltage so;
10.2A*240/48=51A@48V then 916/51*.9(line losses estimate)=16.16hrs, but probably less due to voltage drift as the batteries come down, so my non-expert opinion would be around 12 hrs.
