question

scraggs avatar image

Multiplus II 48/8000 off grid generator sizing

Hi everyone
I am trying to spec a generator for my planned offgrid setup which includes a multiplus II 48/8000 linked to a 930amp wet cell battery bank, I believe the recommended minimum for the 48/8000 works out somewhere around 11kva but my question is would that 11kva allow for any passthrough when the charger is running at full power, my rough calculations (which could be wrong) tells me there is a little kw spare but not a huge amount and obviously there are loses along the way.
With trying to keep fuel usage to a minimum I am looking to try optimise the generator size to fuel usage to the throughput I need and keep the charger going at it's best.

Generatorcharging
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1 Answer
shaneyake avatar image
shaneyake answered ·

You can tell the Multiplus-II what the maximum power it can draw from the AC-INPUT.
You can then use an 11kva generator, configure the Multiplus to 11kva.
You then turn on a bunch of loads, let's say 5kva. The multiplus will then use the remaining 6kva to charge the batteries. If your load goes up or down the multiplus will increase or decrease the charging rate to keep the generator at below 11kva. I would not use a generator smaller than 8kva with 8kva inverter as the transition to and from generator could overload a smaller genny.

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