rogeriko wrote: ↑Tue Aug 02, 2022 10:37 pm
Not for your current situation Justme but general information about matching generators to off grid setups.
If you have a dodgy generator of any type or voltage you can put a fullwave rectifier on the output to give you DC voltage. It could be a three phase generator with a 3 phase rectifier or a 110v generator. Anyway this DC voltage you connect to the PV input of a regular cheap Grid Tied Inverter. The AC output of the inverter you connect to your Off Grid setup. The GTI must be smaller than the output of the generator because it will just run at full power. The PV GTI inverter will think the DC voltage is solar power and start feeding your grid. As long as you have an Off grid battery inverter like SMA or many others this will charge your batteries from the GTI output and when the batteries are charged or there is no more demand on your grid it will shut the GTI down and no longer take any load from the generator which will just idle.
I did consider a similar option for my pto gennerator. But using direct mains into the CU & letting the multipluss II's charge the bats. But as you say the charge must be => than the genny which in my case they are not.
If I did this with the main genny Ithink my numbers wont work.
genny 11kw (single phase 240v but can be split to 110v as well, or even further as it has more wires).
2 x multiplus II 5000 48 70
Even at max charge thats 8.4kw
Would also need a helish sized rectifier.
Or would say a 8kw grid inverter limit the draw on the genny & as the charge drops the multi will phase shift bringing the "solar" power down.
).).