Hello.
Photovoltaic generation can use MPPT to optimize power inversion in shady or varying conditions. Is there such thing as for a battery source inverter ?
Say an inverter works on 24VDC battery in for 120VAC out. When battery voltage decreases, some kind of MPPT to track the diminishing battery voltage to maintain operation -say to 15VDC input. Otherwise, the inverter stops working at its input reaches -say 21V- even if load decreases.

Typical behavior of automotive 12V inverters; which shut-off and stop working at 11V (or do not even start if not near 14V)

 

MPPT is designed to find the maximum power point due to the solar-cell's varying internal resistance (from the maximum power theorem this occurs when the equivalent converter resistance equals that solar-cell resistance).
That wouldn't work for a battery which has a very low internal resistance.
Operating at the max power point would thus lead to very large currents and wasting half the power in the battery resistance.

And for good battery life you don't want to discharge them to that low a voltage.

 

Hello.
Photovoltaic generation can use MPPT to optimize power inversion in shady or varying conditions. Is there such thing as for a battery source inverter ?
Say an inverter works on 24VDC battery in for 120VAC out. When battery voltage decreases, some kind of MPPT to track the diminishing battery voltage to maintain operation -say to 15VDC input. Otherwise, the inverter stops working at its input reaches -say 21V- even if load decreases.

Typical behavior of automotive 12V inverters; which shut-off and stop working at 11V (or do not even start if not near 14V)

You'll only do that once. If your battery reaches 15V on load, you'll need to buy a new battery.

 

Thanks, gentlemen.