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Error 02 on Utility charge


9H1LO

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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 ?

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  • 2 weeks later...

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 ?

 

 

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1 hour ago, 9H1LO said:

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

Well, the protocol manual says "The unit is ℃(NTC A/D value for 1~3KVA )". So that would explain why the value goes down when the temperature goes up: it's a raw NTC A/D value.

1 hour ago, 9H1LO said:

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!)

I don't know the firmware for the lower power models, but for the 5 kVA models, it works on the highest of all available temperature measurements (three internal, and possibly one from the Solar Charge Controller). So it's probably taking heed of the other temperature sensor. So try paralleling it with a 10 kΩ resistor as well and see if that stops the problem. I would not leave it like that, though perhaps finding a suitable value for each NTC might be OK (I assume a 10 kΩ resistor was just a first guess).

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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 !

 

Edited by 9H1LO
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  • 3 weeks later...
2 hours ago, Coulomb said:

Several. Do a search. Unfortunately, I don't recall any solutions.

search on here was first thing i did after it happened :P 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

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9 hours ago, 9H1LO said:

graph from qpigs bus voltage, over the last week

Huh. Perhaps the resolution isn't high enough, but there are no events there that should qualify as bus over-voltage. So either they're very short transients, or not showing because of the sample rate, or the firmware doesn't know what it's doing.

10 hours ago, 9H1LO said:

replacing it...

Sadly, that's looking likely.

10 hours ago, 9H1LO said:

not sure how best to connect the dc psu in so at sunset it can take over

I would not use a power supply to charge the battery, always an actual battery charger. Axperts and their ilk are usually called "off-grid" inverters, since they can be used off-grid, even though 95% of them probably connect AC-in to the grid. Hybrid inverters are like grid-tie inverters that can drop the AC-in connection when the grid fails, while continuing to supply some of your loads from battery and/or solar.

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  • 4 months later...

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