Migonium

Yeah😆 and it’s inside the inverter only, +1C otside and some snow 0050 looks like mppt temperature, sometimes it gets above 100C under 4kW of load and looks like i am getting 02 error from there

Hi, thanks for the reply! Here is the firmware version u1 31 02 and the rest of specs from the label. About the sensor: I haven’t disconnected anything. I’m probably don’t have it at all. I have 4*12v lead-acid batteries 200ah each. There wasn’t any slot in this inverter to connect any external sensor. If I understood you correctly… if you are talking about internal battery charging sensor then that might be a problem

Okay, that’s what I’m getting under significant load until i’ll get 02 error: Q1 (01 00 00 000 017 000 014 00 00 000 0050 0000 11 Q1 (01 00 02 000 017 000 014 00 00 000 0050 0000 11 Q1 (01 00 19 000 017 000 014 00 00 000 0090 0000 13 Q1 (01 00 10 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 09 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 05 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 05 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 02 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 03 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 04 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 02 000 017 000 013 00 00 000 0100 0000 13 Q1 (01 00 05 000 017 000 013 00 00 000 0100 0000 11 Q1 (01 00 15 000 017 000 013 00 00 000 0099 0000 13 Q1 (01 00 03 000 017 000 013 00 00 000 0098 0000 13 Q1 (01 00 02 000 017 000 013 00 00 000 0097 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0096 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0095 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0094 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0093 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0092 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0091 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0090 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0089 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0088 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0087 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0086 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0085 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0084 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0083 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0082 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0081 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0080 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0079 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0078 0000 13 Q1 (01 00 01 000 016 000 013 00 00 000 0077 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0076 0000 13 Q1 (01 00 02 000 016 000 013 00 00 000 0073 0000 11 Q1 (01 00 19 000 016 000 013 00 00 000 0093 0000 13 Q1 (01 00 04 000 016 000 013 00 00 000 0103 0000 13 Q1 (01 00 04 000 016 000 012 00 00 000 0102 0000 13 and in this case it’s normal cuz i’m loading inverter up to 100% but the main issue that I’m getting this error without any load (200-300W) but when battery charging from utility or from the solar panels (more frequently on 20amps charge current, less on 10amps). Now I’ll continue to monitor that floating error and hopefully will understand why it happens. Current question is which temperature in the response refers to which NTC? I’ve found docs on communication protocol of this inverter but there is no any word about Q1 command, it looks like it’s really undocumented anywhere.

Thank you! That is exactly what I was looking for

Btw how to send command? Is there some script to do that? I see that standard watchpower doesn’t have such option

It looks similar by resistance output to this one which i can order locally https://arduino.ua/files/MF52A1.pdf +1C = 29~31 kOhms but first will try to send q1 command somehow. Currently i have solar assistant software on raspberry pi connected to the inverter but it doesn’t allow to send commands. Will try to do that from the laptop.

I’ve disassembled it and seen what’s inside. So there are 3 resistors on radiators looks exactly as yours and fourth near the transformer. Measured resistance of two of them: first one which is on the mppt controller is 37.8 kOhms and second one on the bottom right radiator is 29.8 kOhms in the same conditions (~+1C outside). Also measured that when they heated by the hand resistance drops so that means that they are correct NTC not PTC. But why so big difference in resistance? Is that normal? Maybe i can try to attach them vice versa to see if i’ll get a new error? In the meantime cleaned inverter from dust and assembled back, will wait for the answer.. thanks! (Btw measured disconnected from the board)

Okay, got you! Thanks! Will try to disassemble it on the weekend

Thaks for the response! That sounds like an idea (i have some variable resistors to try this hack), but where i can find that exact resistor which is giving high (or low) spikes? I mean that one which is responsible to measure mppt charger temperature? (On the board)

Hi, i am also from Ukraine and my name is also Mike and i have exactly same problem With the same inverter (Axioma ismppt bf 5000) but for me this error happens when battery in the charge mode only and environment temperature drops under +10C. Fighting with this problem over 2 years and it looks like without firmware modifications it’s impossible to fix it cuz it looks like 02 error is not only about high temperature but about low as well. Never got this error in the summer. Btw inverter throws this error randomly , it might be once in two days or might be twice a day… and it also depends on amps using to charge battery: on 10 amps it not so often, on 20 amps it happens almost every time when battery trying to charge. (Have 4*200ah flooded batteries)