charlez

And not night-time for me. Can be wet and bypass, but if panels are generating some power all seems ok. @APV solution is lasting.

Yes they are poly crystalline and Class A. See data sheet attached. Model Number is CS6U-330P. Canadian_Solar-Datasheet-MaxPower-CS6U-P-v5.52en.pdf

Don't think I will be using Canadian Solar again. Wonder if I should try get them to replace? They do seem to be the common denominator.

Hi @APV rained last night and no 08 error for a change. Yes works exactly like you say. Bulb glows for a second or two and the relay kicks in. I used wire from 30amp extension cord. Next to the 40 amp wire it does look thin but it's only a short run and my 12 panels only producing 4000w absolute max at 220v so should be fine. A BIG thank you to you for figuring this out! I would still like to know what's causing the leak and if other inverters are designed to overcome panel leaks. Charles

Thanks @APV it's in and nothing blew up.

Hi @Classna I searched on "LD03-16B12" and it seems there are many options internationally to source this component.

Hi @APV, been struggling to find a 40amp 220v DC 12vdc coil relay (this for 12 335wp panels in two strings). Would you please suggest a part number and manufacturer. Thanks Charles

Thanks @APV, pity my supplier didn't disclose this issue when I was sold the kit. Please share components needed. Thanks Charles.

Thanks @APV and @Coulomb. Impressive skills. With my setup if it's rains and there is PV voltage, with some current, in bypass mode, the bus voltage stays stable. This changes at sunset as I experienced today. Good all day, then, with the onset of evening, a crash with 08 error.

Thanks @APV all in bypass mode?

This thread gives Voltronic a lot to go on.

@Coulomb I think you are on to it. When mains voltage has peaked at 240v or so has been a feature of the problem. This is what I sent to my supplier when it first happend. Inverter went down at point 1 on graph, restarted a few times between 1 and 2 but same issue with error "08" caused inverter to fail. So left off from 2 to point 3. Hope this helps. Charles

Thanks @Coulomb. I have a 350w pump that runs 24/7 so unlikely that the load dropped below that. I do have a 1hp pump supplying water to the house connected and fridge connected. These are the defining features of the problem as I see them: Load around 15% No PV voltage But PV breaker connected Bypass mode Moisture on panels Been in bypass mode for quite a while, multiple hours Rained the whole night on and off. Disconnected the panels and the unit stayed up all night. Still raining but panels producing some power at 1 or 2 amps. Bus voltage stable. ================ Status ================== Parameter Value Unit ac_input_frequency 49.9 Hz ac_input_voltage 232.5 V ac_output_active_power 0666 W ac_output_apparent_power 0697 VA ac_output_frequency 49.9 Hz ac_output_load 013 % ac_output_voltage 232.5 V battery_capacity 057 % battery_charging_current 002 A battery_discharge_current 00000 A battery_voltage 49.90 V battery_voltage_from_scc 00.00 V bus_voltage 372 V inverter_heat_sink_temperature 0033 Deg_C is_ac_charging_on 0 True - 1/False - 0 is_battery_voltage_to_steady_while_charging 0 True - 1/False - 0 is_charging_on 0 True - 1/False - 0 is_configuration_changed 0 True - 1/False - 0 is_load_on 1 True - 1/False - 0 is_sbu_priority_version_added 0 True - 1/False - 0 is_scc_charging_on 1 True - 1/False - 0 is_scc_firmware_updated 0 True - 1/False - 0 pv_input_current_for_battery 0002 A pv_input_voltage 130.0 V unknown_value_in_byte_response 010 Need to put that script together to monitor bus voltage.

Hi all, thought I would share this. Spent whole day on bypass, rainy day with very little power generated. PV panels connected, bus voltage has risen to 480V at about 17:30. ================ Status ================== Parameter Value Unit ac_input_frequency 49.8 Hz ac_input_voltage 226.6 V ac_output_active_power 0992 W ac_output_apparent_power 1065 VA ac_output_frequency 49.8 Hz ac_output_load 021 % ac_output_voltage 226.6 V battery_capacity 057 % battery_charging_current 000 A battery_discharge_current 00000 A battery_voltage 49.90 V battery_voltage_from_scc 00.00 V bus_voltage 480 V inverter_heat_sink_temperature 0031 Deg_C is_ac_charging_on 0 True - 1/False - 0 is_battery_voltage_to_steady_while_charging 0 True - 1/False - 0 is_charging_on 0 True - 1/False - 0 is_configuration_changed 0 True - 1/False - 0 is_load_on 1 True - 1/False - 0 is_sbu_priority_version_added 0 True - 1/False - 0 is_scc_charging_on 0 True - 1/False - 0 is_scc_firmware_updated 0 True - 1/False - 0 pv_input_current_for_battery 0000 A pv_input_voltage 000.0 V unknown_value_in_byte_response 010 PV panels disconnected, bus voltage drops ================ Status ================== Parameter Value Unit ac_input_frequency 49.8 Hz ac_input_voltage 227.7 V ac_output_active_power 1042 W ac_output_apparent_power 1161 VA ac_output_frequency 49.8 Hz ac_output_load 023 % ac_output_voltage 227.7 V battery_capacity 057 % battery_charging_current 000 A battery_discharge_current 00000 A battery_voltage 49.90 V battery_voltage_from_scc 00.00 V bus_voltage 442 V inverter_heat_sink_temperature 0031 Deg_C is_ac_charging_on 0 True - 1/False - 0 is_battery_voltage_to_steady_while_charging 0 True - 1/False - 0 is_charging_on 0 True - 1/False - 0 is_configuration_changed 0 True - 1/False - 0 is_load_on 1 True - 1/False - 0 is_sbu_priority_version_added 0 True - 1/False - 0 is_scc_charging_on 0 True - 1/False - 0 is_scc_firmware_updated 0 True - 1/False - 0 pv_input_current_for_battery 0000 A pv_input_voltage 000.0 V unknown_value_in_byte_response 010 Thanks Charles

@rddkrn thanks for this. Something I have been wanting to do. Would you mind sharing your code? Is it Python?

@APV was hoping this was the problem. The way I see it now is: Does not seem to be leakage because of poor wiring protocol. Could be a problem with Canadian Solar with water ingress. Not a specific earthing problem with my setup. I have earthed the panels to a panel specific earth spike. My PV panels are isolated via a DC breaker and surge protector. All this still points to the Axpert, most likely firmware but obviously could be hardware. Even is the panels had an internal issue the leakage should be isolated and not cause a high bus voltage issue, but this is something I know very little about.

No water and crashed with the 08 error after being on bypass for a few hours.

Hope this works.

Hi @APV I must confess I also took a short-cut and my pv wires are also just lying on the roof. Do you think that if I cable tie them to the rails that would be good enough? By the way they these are the panels: 330 WATT POLY CANADIAN SOLAR PANELS

This morning got Error 08 again after some rain. Thanks to @APV by isolating the PV array I was able to restart the inverter without it crashing again. With the PV array connected the bus voltage would have spike again requiring multiple starts. My earth leakage did not trip.

Error 08 happened this morning again:

@BvR how are you communicating with Voltronic? Would it help if we did the same?

That's way beyond me. A Google search seems to reveal that more people are experiencing the problem. Has to be firmware.

Interesting this manual says 08 error is a firmware problem. Copy_of_PIP-HS_MS_4-5KVA_new_Service_manual_201506A (1).pdf

@APV I can confirm the problem persists, happened now after full day of cloud cover and on bypass mode.