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need some advice please, I have ( I think in error ) purchased a hybrid 1KW (axpert clone type china thing) 12v (PWM) model, I have installed a few of these in the past however always 24v or 48v versions which are always MPPT, but this time I needed to go with 12V as having moved to Lifpo4 and battery cost is high so I'm trying out a small system with 12v on 1 lifepo4 So....my issue is this, I think i should have got an MPPT version of the inverter as the specs say VmPP 15-18V with Max Open circuit voltage of 55v, my panels are vmpp of 31.4v and OC of 38.4v, so i take this as the inverter will be fine but highly inefficient, right ? Or would the panel voltage be too high anyway ? What if i put an MPPT controller between the panels and inverter PV input ? Or should i just try to find the MPPT version of the inverter and sell the PWM one ? (still in un-opened box) thanks

fitted the inverter again after a while not in use getting the error 08 again bus doesn't show any peaks at or before shutdown...i'm really at a loss

graph from qpigs bus voltage, over the last week, the drops below 400v are always coinciding with error 08 - the gaps are due to it being offline after the failure

search on here was first thing i did after it happened didn't manage to find a solution i will take it apart and have a look around the board again but I can't keep going on like this so i will probably get rid of it i'm now considering 2 options, replacing it with a better branded hybrid inverter or building a hybrid from separate components....pv controller....dc psu...dv/ac inverter ect, just not sure how best to connect the dc psu in so at sunset it can take over to charge the batteries & take the inverter load...need to find more info

lately getting a new issue.....error 08 (bus voltage too high) and shutdown killing the o/p i'm getting sick of this inverter now ! anyone had this issue ?

thanks for your reply, yes i did consult the protocol manual, thanks to it I have written some software to monitor it in my HA system, however the value i don't really think is ℃ as its always been some strange value so it must be some raw value from the ADC as you say. The 10k res was just a trial to see how it behaves, yes i will try and put a 10k across the other NTC and see what happens. i have had some corrosion due to condensation, as i mentioned in another thread i had issues with the VBat voltage divider going bad and giving bad readings also and i cleaned that up and it was fixed but now I keep having these temperature shutdowns even though the damn thing would not even be luke warm i rarely charge from grid, its not efficient but on day like today, when the batteries have been depleted to around 65 to 75 % due to the sun coming in and out all day, by the late afternoon there is not enough sun to top the batteries up again and supply the load also, to currently get around this i have made some changes to my scripts to watch out for this situation, whereby if its now 2pm and the batteries are <65% then switch the load to grid and use all PV to top up the batteries. I want to have the batteries at 100% for the night time as my countries electricity supply is currently not 100% reliable if i can at least get it do not keep shutting down on charge due to incorrect temp reading i will be happy with that then for safety i think i will add some ds18b20 sensors to the heatsinks connected to the controller i'm talking to inverter with, but i would rather actually fix the problem then doing work-arounds and by-passing the in-built protections !

i do not know about this preset, i don't think mine has it and i would not go around varying things unless you have a service manual explaining what they are or you know what you are doing, it could make things worse i don't think its something for an electrician (the inverter installer type) find someone with electronics repair skills that can go down to component level if you don't have the skills to do it yourself

on my 2KVA model the 1M smd voltage dividers are just above the fan and in high humidity condensation was building up on them, eventually they failed due to corrosion, i only noticed after inverter kept shutting down saying (i think error 09) and high battery voltage and reading was >30v even though batteries were at 26V (2kva is 24V) I cleaned up the board and replaced the 1M resistors, and also put a small 1M preset instead of one of them to calibrate the reading as the divider is not that precise in my opinion then I sprayed some varnish over the area after drying it properly to avoid this condensation building up as my inverter is outside in a cabinet but in my country it could be 25C with 99% humidity and the fans make the situation worst due to venturi effect i think

checked both the NTC's that are screwed to the heatsinks, this model does not seem to have an NTC on board next to the x-former both NTC's are around 15K ohms cold and go down when heated When running QPIGS command on USB i get a reading that says temperature is around 60C, even though the unit will be cold in an ambient of around 15C, heating the charger side NTC makes the QPIGS reading go down not up....so i'm not really sure if the reading on the USB interface is really deg C or arbitrary at this stage I added a 10K resistor in parallel to the charger side NTC to see the behaviour, the reading was gone from 60C to 30C now but when charging batteries from utility (set @10amps) it still shuts down with error 02 after about 5 minuets and even the output is switched off even if being in LINE mode (this is stupid it should just go to bypass not kill the o/p in my opinion!) anyone have experience with this situation ?

i have what i think is an axpert "clone", its called Iconica 2KVA its been installed for over a year and had some minor issues, mainly due to condensation around the fan area (its too noisy to keep inside!) recently it has been shutting down the output and giving error 02 which seems to be temperature related, and i narrowed this down to only happening when I charge from Utililty, the worst thing is that it totally kills the output and goes off, protecting itself i guess, this happens within about 2 minutes of the charge starting, I am suspecting that the issue may be a faulty NTC or some resistors around the NTC, I have looked at the service manual for the 5KVA model and the NTC's look quite similar, anyone with any experience with these issues ?