question

Hi, what you call Gen Support is what we call PowerAssist, and I think its might be fair to say that we invented the feature for this market. (!). So yes; normally there is no need for a large generator.

I dont have time to help with all calculations (anyone, please help Peter); but, I would be surprised if you’d need a generator thats of higher capacity than your inverter/charger pack (10kVA).

It’s nicely explained here:

https://www.victronenergy.com/blog/2016/08/29/multiplus-magic-small-generator-big-power/

Considerations to that I can think of that define the generator size are:

- minimum input current limit (generator must be able to supply at least that)

- time to charge: take generator capacity, substract average load by consumers, and then you’ll have the available power to use to charge the batteries. Take ~15% out in losses in the charger, and now you’ll have the power that can go into the battery. Now, find out how much energy needs to go in, divide that by the power, and you’ll have the charge time. If too long, take a larger generator (or add solar instead of investing in a new generator).

- perhaps there are more considerations; I’m sure someone else here doing these calculations daily can chip in.

Success!

Hi Peter. I too have a single 48/5000/70 (not 2x, so I don't quite know how to deal with that). But I have a CCGX, which has a setting to tell the Multi to limit genny input. If you don't have a GX box then perhaps you should?? Yeh, of course it works.. :)

An ongoing issue I have is that my Multi is very picky about accepting dirty power. Not blaming Victron for that, I just had to go through the VEConfigure settings to fix it. Right to the ultimate point of telling it to "Accept Dirty Power". That seemed to come with a downgrading of amps, below the GX setting, but still ok for me so I left it. Not sure if it's meant to do that.. Older Yamaha 6600 (AVR).

This is the most comprehensive information that we have about generators and multis:

https://www.victronenergy.com/upload/documents/VE_Marine_generator_test_RVA_07-jan-2008.pdf