Hello, first post so sorry if this is in the wrong forum.
I have a UK 3-phase (3x80A) supply and 3-phase zappi charger (used at 22KW). Our house loads are all on one phase.
I'm considering adding a single phase hybrid Fox inverter, with EP11 batteries and 5 solar panels.
The batteries would be charged off peak at the same time as the EV and timed house loads (washing etc.).
I think the EV and house loads currently peak around 50A on the house phase.
I think this leaves enough headroom for the inverter to charge batteries on the house phase but would I be better putting it on a different phase? If so could the inverter be configured (with a 3-phase meter?) to balance the house import on one phase with equivalent export on its phase (so my net summing meter reads about zero)?
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It's normally best practice to use a 3ph inverter so you can cover loads on all phases, while the inverter does allow a fair amount of unbalanced load. That being said, there is nothing preventing you using a 1ph inverter on one phase.
I would recommend a H1-gen2 or KH series if going single phase, as with the latest firmware, you can configure dynamic load management and set the max current to say 75amps so you stay under your 80amp limit, regardless of what is running at the time as the fox system will throttle the charging speed down. You could also configure a long and slow overnight charge by setting the battery charge amps. (Word of warning, the battery charge amps are DC Amps not AC amps so don't get those confused.)
I have recorded the steps to adjust the battery amps here
I would recommend a H1-gen2 or KH series if going single phase, as with the latest firmware, you can configure dynamic load management and set the max current to say 75amps so you stay under your 80amp limit, regardless of what is running at the time as the fox system will throttle the charging speed down. You could also configure a long and slow overnight charge by setting the battery charge amps. (Word of warning, the battery charge amps are DC Amps not AC amps so don't get those confused.)
I have recorded the steps to adjust the battery amps here
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FoxESS Tri Inverter Installation
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32 x 490w across 4 arrays
Dual Tesla Household
Heatpump & Low Carbon Housebuild
Thanks for the quick response. Sorry to come straight back with more questions!
Are you recommending putting the single-phase H1-gen2 or KH series on the same phase as the house load?
(and using load management to prevent drawing over 80A). That does seem the simplest option.
I gather a 6KW H3 can supply about 2KW per phase.
If I'm using 3KW on one phase can it be configured to provide 3KW (across the phases) so that the net import is zero?
A 3-phase inverter will cost more, and I assume cost more to install and I don't think I can justify it.
Are you recommending putting the single-phase H1-gen2 or KH series on the same phase as the house load?
(and using load management to prevent drawing over 80A). That does seem the simplest option.
I gather a 6KW H3 can supply about 2KW per phase.
If I'm using 3KW on one phase can it be configured to provide 3KW (across the phases) so that the net import is zero?
A 3-phase inverter will cost more, and I assume cost more to install and I don't think I can justify it.