Set up a small system for a local guy... He seems to think the battery is draining too quickly

[ericfx1984]

This is exactly the reason most here insist on having a basic energy audit before proceeding with unknown requirements.

Which I did... He still did not believe it...

 

[ericfx1984]

Gallons of gas consumed in a generator is a decent approximation of electrical needs.

A gallon of gas has 33.7kWh of energy in it. Assume the generator converts 1/3rd of that into electricity.

So, one will need 11.2kWh of electrical energy for for every gallon of gas their generator consumes if supplying via solar/battery.

I never realized that... It's good to know that conversion

 

[Ampster]

one will need 11.2kWh of electrical energy for for every gallon of gas their generator consumes if supplying via solar/battery.

At $5 per gallon that is $0.44 per kWh.

 

[sunshine_eggo]

I never realized that... It's good to know that conversion

While it's already been discussed, it's worth noting that the inverter idle power draw is a NEW load. 3kW Growatt/MPPT tend to be between 40-50W, which would be 960-1200 additional Wh/day on top of the use calculated from the generator consumption.

 

[sunshine_eggo]

At $5 per gallon that is $0.44 per kWh.

Sadly... it seems like that's competitive with some utility rates!