Sanity check for charging batteries independently of the multiplus

Q&A and troubleshooting
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1

I’m running a multiplus 24/3000 70-50 and a Smart Solar 250-100. Battery bank is 24v 280ah eve cells. WHat I want to be able to do is generator charge the batteries while the multiplus is inverting. Having a non - AC passthrough option would be ideal but sadly it isn’t available on the multiplus as far as I know.

The reason I want to do this is generator frequency is variable at best and I want to shield the house from this if the generator decides it wants to have a cow and jump around all the place. I also would like the option of having a small generator just chip away at charging the batteries on dead days without worrying about a 2k load all of a sudden and ending up with a snapped crank.

So I’m thinking of something like a Victron Phoenix Smart Charger 24V 25A model to do this with the generator running it and it charging the batteries with the multiplus on the other side blissfully unaware. Would also like to be able to connect what I use to a Venus as well.

Anyone tried something like this?

2

In VE config for the inverter you can set the acceptable limits for voltage and frequency. If you generator then throws a fit, and goes outside these limits, the inverter will switch from charging to inverting and automatically isolate your loads from the erratic voltage / frequency. The inverter will then wait for the generator to settle down again, re-synchronise and commence charging again.