question

I can't talk about the UK regulations and if this will be certified there BUT You should be able to export the maximum of your PV panels to the grid no problem via the Pass-Through. It's rated at a maximum of the 5000VA the MultiPlus can deliver via the AcOut I believe... Also you can put a limit on the ACIn of the MultiPlus that it will not exceed for example the 32A. I can't recall if that's also applied for the feedin to the grid... It should be in the manual...

@7hvn Sorry but you are not correct your array does not determine the power to the grid your inverter does. Please confirm your inverter size ie is it 3kW if so this is what you put. Another person has asked a simular question i will copy my response below.

Oversizing an array is common practise and an array can be 133% larger than its inverter ie if you have a 3kW inverter you can oversize the array to 3.99kW it will still only ever convert 3kW useable energy. Oversizing is a way to make the inverter start its morning cycles early and finish later good for low light conditions. Hope this makes sense. your inverter determines how much you can dump to the grid. PS if one system is AC PV and the other DC not on a hybrid inverter then the two sums of the inverters need to be added to get the overall total of potential power that can go to the grid.

Yes they over compensate building safety margins in, likely hood of you dumping your whole setup into the grid well the stars and the moon would need to align, but over engineering is what we do best in this county and most of the time pays off. Always good to have a buffer margin hope this makes sense?

I have just been though the process of DNO application but its taken a bit longer than some about a month and a half but approved G99 7kW system just because i wanted to build some redundancy into my install for higher load services eventually EV charger so i wanted 100amp supply instead of my 60amp supply. They only approved it after they changed the fuse

@7hvn Oh right. they would more than likely require you to demonstrate that it does not produce more ie someone might come out to see the system. But yes you are correct you could only ever dump 4.4kW but if the PV was ever wired on the input side then you could dump that potentioal. Not saying you but if someone took over that system it could happen. if that is factored in now by them they never have to worry that extra power not compensated for is being dumped into the grid

Some updates:

I've looked further into:

• ESS > Grid Feed-In > AC-coupled PV - feed in excess > Limit system feed-in > Maximum feed-in > 1000W

I cannot get this setup to work - I believe this is for Fronius AC PV Inverters only.

This kind of makes sense as my SolarEdge Inverter can currently only modulate its output in APS mode. The only time it goes into APS mode is on a LOM event where the Victron Aux relay is used to perform the dry contact to set the PV Inverter into APS mode. Thus by default the Victron cannot modulate to reduce the PV generation via frequency shifting if the grid is still live.

Next I looked at 'Grid Current Limit' aka 'Input Current Limit'.

• VRM Dashboard: 'Grid Current Limit'
• Remote Console: MulitPlus-II 48/5000/70-50 > Input Current Limit > 50.0

The latter implies that this is an 'Input' current limit only but it appears to be an 'Export' limit also.

For testing I set the 'Grid Current Limit' in the dashboard to 13A (2.99kW @ 230v). I then set the 'Grid setpoint' (ESS > Grid setpoint) to -4000W. The export appears throttled at just under 3000W. Now changing the 'Grid Current Limit' to 16A the export to rise then limits around 3680W.

In theory then if I set the 'Grid Current Limit' at just under 32A I should stay within my export limitation.

I don't really think this is the idea solution though as it limits import too. Is there no way to set an Import Limit and Export limit separately?

Thanks in advance...