Previously installed system:
Solaredge 368H inverter with 5.8kWp PV's.
MyEnergi Zappi 2
MyEnergi Eddi
Newly added system:
FoxESS H1/AC 6kW inverter with 2x10kWh batteries.
CT clamps to the Myenergi devices were incorrectly re-placed by the installers (the PV's were taking in power rather than generating it) so I did have some fiddling to do to make things work as expected. I say this in case I've inadvertently cocked things up. My problem now is that the batteries do not take any surplus energy from the PV's. The FoxESS inverter sees them as a generating 'load' but it's all going to the grid. The installer either doesn't know or isn't interested in a solution. Can anyone give me some help/advice please?
3rd party PV's not charging the batteries
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Dave Foster
- Posts: 1786
- Joined: Thu Oct 13, 2022 7:21 pm
The traces you have posted don’t appear that unusual, although i’m not sure what you are trying to do with the 2 schedules that set self use from 05:30 to 16.15 and 16:45 to 23:30.
If you are setting a minsoc of 70% the batteries won’t be used unless they get above that value when charging from solar.
Normally you would just force charge you batteries in the early hours and then leave them in self use with minsoc at 10% for the rest of the day.
On the picture of the house, if you swipe left you will see the pv production, self sufficiency etc.. but at the bottom of the page is the daily graphs for load, grid, battery and solar and below that your state of charge - it would be helpful if you could post that so I can see how the system behaves during the day.
If you are setting a minsoc of 70% the batteries won’t be used unless they get above that value when charging from solar.
Normally you would just force charge you batteries in the early hours and then leave them in self use with minsoc at 10% for the rest of the day.
On the picture of the house, if you swipe left you will see the pv production, self sufficiency etc.. but at the bottom of the page is the daily graphs for load, grid, battery and solar and below that your state of charge - it would be helpful if you could post that so I can see how the system behaves during the day.
Sorry - I should have clarified those settings - the batteries stop charging at 0530 (at 85%) and then seemed to want to keep discharging to the grid no matter what the PV's were doing. As they weren't being charged by solar I decided to set a limit on this vampire drain from at 70% and then once the PV stopped generating (around 1630 ish) the batteries could kick in until 2330. If the PV charged the batteries as I would have expected this wouldn't be necessary. I can show previous days where this has been the case ie., both the batteries and the PV both merrily discharge to the grid.
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Dave Foster
- Posts: 1786
- Joined: Thu Oct 13, 2022 7:21 pm
What I would expect to happen after 05:30 is that the batteries would immediately start to be used to cover the house load (plus ~100 watts ti run the inverter/batteries etc..) but nothing should be exported to the grid - is that the phantom load you mean?
Then in the morning when the solar generation starts the inverter will wait until there is sufficient solar to run the house load which would reduce the battery usage to almost nothing, and then any excess would be used to charge the batteries.
If the batteries are not charging from the solar (and there is no sign of it on your traces) that suggests the inverters CT clamp might not be in the right place and it isn’t measuring the generation correctly.
The CT clamp for the inverter would normally be on the the live feed of the smart meter but as you have a zappi you would typically wire it such that the live feed was split - one leg to the Zappi and the other to the house consumer unit, solar and Fox inverter, and that way the EV charge is not seen by the Fox inverter which would flatten you home batteries.
Then in the morning when the solar generation starts the inverter will wait until there is sufficient solar to run the house load which would reduce the battery usage to almost nothing, and then any excess would be used to charge the batteries.
If the batteries are not charging from the solar (and there is no sign of it on your traces) that suggests the inverters CT clamp might not be in the right place and it isn’t measuring the generation correctly.
The CT clamp for the inverter would normally be on the the live feed of the smart meter but as you have a zappi you would typically wire it such that the live feed was split - one leg to the Zappi and the other to the house consumer unit, solar and Fox inverter, and that way the EV charge is not seen by the Fox inverter which would flatten you home batteries.