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bryn avatar image

generator choices offgrid

I am about to change our inverter over to a new victron, and we need to get a generator to go with it.


The system will be a venus GX and a victron multiplus 5000/48 AC-coupled with a fronius primo 5-0-1 and later on a DC coupled blue solar MPPT. Batteries are 2x LG RESU 10, so 20kwh in total.


I want the AC input on the multiplus to be a generator- for charging only. I've always been told that we need to use an inverter generator to keep the power quality up but I note that a few places on the victron site suggest that AVR units will be fine- thoughts? I don't want a huge generator, about 5kva ish is my plan, and use the current limiter on the ac input to ensure its not overloaded.

Generatoroffgrid
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Generators are a 'dime a dozen' these days -- I have found the issue is getting the VenusGX to produce or provide any control or monitoring whatsoever to be very difficult. I spent hundreds of $ on the VenusGX and all it does is provide dodgy data that can't be relied upon. Victron staff will not even answer any questions. It appears that selling Victron products is given priority but providing actual support is very poor...

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Christyler avatar image
Christyler answered ·

I use a Cummins Onan 4.8 me, it works really well, and it's easy to integrate the remote start

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JohnC avatar image
JohnC answered ·

Hi Bryn. I don't think Victron have any particular recommended types (at least officially), and they've put some work into testing them (perhaps before the inverter era). This is ageing a little now, and it's quite lengthy, but you may have your eyes widened if you delve to the more technical aspects: https://www.victronenergy.com/upload/documents/VE_Marine_generator_test_RVA_07-jan-2008.pdf

I've a 48/5000 Multi at home and have used both types. The Multi is fairly picky about power quality and my old Yamaha AVR it doesn't like. But can be tweaked to accept it, with some loss of power capacity and efficiency.

If you could find a supplier to 'guarantee' acceptance by the Multi, then go for it.


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bryn avatar image
bryn answered ·

batteries already exist- we have an existing system where the inverter is not coping, so I need to swap it out.


that multiplus page is what I was referring to- it says AVR units are ok. I guess I just want to validate that people find they do work ok and that I don't need an inverter unit.

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ian@solarplants avatar image
ian@solarplants answered ·

An SDMO in the 6 to 10 Kva range would be a nice choice

LG Resu are not a good choice for off grid set-ups however. 2 x BYD B-Box or B-Box pro would be better, or Victron home brand Li Fe PO4

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Boekel avatar image
Boekel answered ·
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