Hi,
I had my system installed 3 weeks ago, this morning I noticed that my battery didn't charge overnight and there is an alarm on the app showing code 26, 27 and 1.
Whole solar system is installed on separate consumer unit, the breaker ladled as PV was off, it tripped right after midnight ( i have a schedule to force charge the battery from 00:01)
This is 10.5kw Hybrid Inverter (the other PV barker is for a 3.6kw slave Inverter).
Rvolt stats on the inverter shows in similar range every day 237-248 range.
Any suggestions to why this tripped ?
The breaker appears to be rated ok based on your 10.5kW inverter, you wouldn’t normally expect that to trip - but - it will depend upon how that circuit has been wired, it is possible if that also feeds your main consumer unit that you might have exceed the 50A. - probably best for your installer to check that out.
When your batteries charge normally overnight what is the charging power ? (You should be able to see from the app graph what the charge kW is).
For now switch the breaker back on and if it closes ok without popping open then you should be ok until the battery charges again - it is possible to limit the battery charge power in the inverter settings which will keep you going whilst you wait for your installer to check it out, if if you can tell me that battery charge power i’ll guide you from there.
When your batteries charge normally overnight what is the charging power ? (You should be able to see from the app graph what the charge kW is).
For now switch the breaker back on and if it closes ok without popping open then you should be ok until the battery charges again - it is possible to limit the battery charge power in the inverter settings which will keep you going whilst you wait for your installer to check it out, if if you can tell me that battery charge power i’ll guide you from there.
Hey Dave,
I have attached the charge and discharge stats from from the event time when barker tripped.
I am also attached the spider web they left in my meter box....
I have attached the charge and discharge stats from from the event time when barker tripped.
I am also attached the spider web they left in my meter box....
Attachments:
Hmm, not much sensible I can say about that wiring....
It looks like your inverter must be coming off a single feed that also contains your 'serial inverter' and car charger. Is the serial inverter a solar only inverter and you have CT2 connected to it to monitor ?
It appears as if the CT clamp has been fitted in the main meter cupboard which would suggest that your inverter will see your EV charger as load and try and supply it from battery as well ?.
I can see from you scheduler settings that you are charging your batteries, then dumping them to grid, then charging again during the low tariff period - is that your intention ?
All of that said the battery charge power is 9.73kW and your grid consumption is 10.54kW and even taking the lowest grid voltage range it's still only 48A which should be well within that 50A breakers capability... the only slight doubt in my mind is that you are going from a Force Charge to Force Discharge which will see almost a 100A swing which might be catching the breaker out, you could try leaving a couple of minutes between charge and discharge schedules.
As I said you can reduce your maximum charge power in the Inverter Settings, to do that at the Inverter panel go into Settings, Battery, Max Chg Cur and enter a number in Amps for the DC charge current.
To work out the power you need to know your battery voltage, so for example if you have an EP11 it's a nominal 380V and so to reduce the charge power to 5kW, and you would choose 13.2A (DC amps = Charge Power [watts]/ Battery volts)
It looks like your inverter must be coming off a single feed that also contains your 'serial inverter' and car charger. Is the serial inverter a solar only inverter and you have CT2 connected to it to monitor ?
It appears as if the CT clamp has been fitted in the main meter cupboard which would suggest that your inverter will see your EV charger as load and try and supply it from battery as well ?.
I can see from you scheduler settings that you are charging your batteries, then dumping them to grid, then charging again during the low tariff period - is that your intention ?
All of that said the battery charge power is 9.73kW and your grid consumption is 10.54kW and even taking the lowest grid voltage range it's still only 48A which should be well within that 50A breakers capability... the only slight doubt in my mind is that you are going from a Force Charge to Force Discharge which will see almost a 100A swing which might be catching the breaker out, you could try leaving a couple of minutes between charge and discharge schedules.
As I said you can reduce your maximum charge power in the Inverter Settings, to do that at the Inverter panel go into Settings, Battery, Max Chg Cur and enter a number in Amps for the DC charge current.
To work out the power you need to know your battery voltage, so for example if you have an EP11 it's a nominal 380V and so to reduce the charge power to 5kW, and you would choose 13.2A (DC amps = Charge Power [watts]/ Battery volts)
From what I have gathered so far they are running separate cable for each solar inverter and EV so 3 additional AC cables from the meter box, they did cat5 cable as well so the EV can read data or something ? and it tells me the power production on the EV charger display.
Yes it is my intention to charge and discharge overnight.
It looks like the system went offline at 00:22 so that's 21 minutes since the force charger started. Will the swing from discharge to charge would trip the breaker with 21 min delay ?
I have a small inverter in the garage 3.6kw that runs 8 panels and only sends the energy to the system.
I know the wiring doesn't look impressive but i doubt I will be able to get it changed just for the esthetics, unless I can prove that is not installed in accordance to regulations which I am not so familiar with myself.
I will try to reduce the charging power and see how it goes.
Yes it is my intention to charge and discharge overnight.
It looks like the system went offline at 00:22 so that's 21 minutes since the force charger started. Will the swing from discharge to charge would trip the breaker with 21 min delay ?
I have a small inverter in the garage 3.6kw that runs 8 panels and only sends the energy to the system.
I know the wiring doesn't look impressive but i doubt I will be able to get it changed just for the esthetics, unless I can prove that is not installed in accordance to regulations which I am not so familiar with myself.
I will try to reduce the charging power and see how it goes.
If it was 20 mins into the Force Charge it won’t be the c/o from charge to discharge - the breaker should be rated for it but it’s entirely possible it may be tripping early.
I would keep a careful eye on it as the inverter can still output at 10.5kw which may also trip it if the output was maintained for 20 mins. But in the long run probably best to get it changed (for a 63A)
I would keep a careful eye on it as the inverter can still output at 10.5kw which may also trip it if the output was maintained for 20 mins. But in the long run probably best to get it changed (for a 63A)
Yh it is very random, it was running on the same schedule for like a week and it tripped first time, they only thing i noticed that grid load the time it tripped was 10.65kw, max load so far was always under 10.5
Thank you for looking into to this.
Thank you for looking into to this.
Sebastian and Dave, did this work ? My system a 5kw inverter and 10kw battery for the last couple of weeks charges for about 15 minutes in the 2-5 am cheap rate time and I wake up to a tripped breaker on the consumer unit fitted by the installers nearly a year ago. It always switches back on fine. I've logged this with fox and let the installers know. I'm not very technical but any thoughts or help on this you can offer would be appreciated.
How big is your breaker, and is it an RCD that trips with leakage (if you post a picture I can tell you).JDW wrote: ↑Sat Nov 08, 2025 5:31 am Sebastian and Dave, did this work ? My system a 5kw inverter and 10kw battery for the last couple of weeks charges for about 15 minutes in the 2-5 am cheap rate time and I wake up to a tripped breaker on the consumer unit fitted by the installers nearly a year ago. It always switches back on fine. I've logged this with fox and let the installers know. I'm not very technical but any thoughts or help on this you can offer would be appreciated.
Changing the MaxChargeCur will work but it’s really masking another fault i.e. either a faulty or under-rated breaker.
Do you know whether you have a Gen2 H1 if not can you say when it was installed ?
I'll attach a picture of the circuit breaker fitted by the installers. The breaker that trips is the one labelled "RTAMB32BD". It says it's 30ma.
The system was installed in Jan 25 but was charging o.k although this year the amount of sunshine we had with 13 400w panels I barely needed to charge the battery.
Is it possible that progressive load on the circuit breaker if it isn't rated high enough to safely pass through the load would make it more prone to tripping ? I'm not a sparky as you can tell but interested to know. I'm able to change setting on the inverter as a short-term fix so if you were able to tell me they exact path to setting requiring changing this would help whilst I wait for a fix from the original installer company. Appreciate your help
Settings, (password is 0000 so press Enter 4 times), then Battery and MaxChgCurr - this is the DC current in amps and you need to know your battery voltage to work out power in watts.- if you go to the app click on ‘Devices’, Battery, Info, Detailed Parameters it will show you your battery voltage.
Power in watts is the Battery Voltage * the DC Charge current - so for example if your battery voltage is 300V and you set a charge current of 10A your charge rate will be 3000 watts.
The breaker you have attached is an RCD which trips if it senses too much leakage current - large chargers, heaters etc.. all have large leakage and so when you are charging at high power the leakage is too much for that breaker.
Fox recommend that the system uses a 100mA Type A RCD and so changing that RCD for an RCD with a larger rating would likely solve your problem - i’d recommend getting in touch with your installer or a qualified electrician to do that.
Let me know how you get on.
Power in watts is the Battery Voltage * the DC Charge current - so for example if your battery voltage is 300V and you set a charge current of 10A your charge rate will be 3000 watts.
The breaker you have attached is an RCD which trips if it senses too much leakage current - large chargers, heaters etc.. all have large leakage and so when you are charging at high power the leakage is too much for that breaker.
Fox recommend that the system uses a 100mA Type A RCD and so changing that RCD for an RCD with a larger rating would likely solve your problem - i’d recommend getting in touch with your installer or a qualified electrician to do that.
Let me know how you get on.
Thank you Dave. Great information. I'll make the changes and see if it gets me through the next few days while I await a larger RCD. I'm a little disappointed my installer appears to have provided me an RCD that could not cope with the load but hopefully they will rectify this. Thanks again for the info.
Thanks for the advice Dave, I reduced the setting to 30 and the battery charge dropped from 6.5kw to 4.5kw. at 6.5kw the RCD was tripping after about 10 minutes recharging but I got a solid recharge in the early hours without an RCD trip.
I wonder if there is damage within the RCD board.
I will now see how the installer after sales support measures up. I do have a support ticket logged with foxess but the potential logic of a customer fiddling around disconnecting multiple electrical cables to potentially return these units to base smacks of a high risk activity for the non electrically trained. I'm hoping there is an onsite support model.
Ok well that explains the tripping, it’s possible one of the conductors was left slightly loose and it has been arcing which will eventually cause the contact to severely overheat and damage the cables (i’m hoping it isn’t in the inverter mains connector) - obviously not good but fingers crossed for a quick response.
For safety leave the breaker off so that the inverter is isolated until the installer is able to attend and make it safe,
For safety leave the breaker off so that the inverter is isolated until the installer is able to attend and make it safe,
Good shout Dave I've turned the RCD off. The burning smell was coming from the gap between the solar PV system main AC isolator and the PV RCD. Thank you for your advice I'll update once the installer has attended.