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PIP 5048 MK, Axpert king 5kVA - MPPT current adjusting


vitecekmatrka
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Dear solar colleagues, professors, lectors, producers, tunners, users. 

Im not really happy that one of my 3 inverters does not show correct PV watts, gained from PV current ( after conversion to batt related on 48V) 

I have 2 same orientated 3S 5P pannels on each. same solar conditions, same brand of pannels - if I read by clamp meter ( DC, with hall) both inverters input shows practically same current and voltage on PV input. 
In axpert it does not show same values even both inverter ( AC 230 ) are switched off. 

The PV A input need an software adjustment. 

PV current shall be same on both inverters and it must cooperate to battery current if inverter is only in a charger mode. 

Dear friends, does anybody hede do this kind of adjustment? Ive read somewhere, that it shall be possible but now I dont have idea where it was posted. 
If is here ( this forum) please send me link where to be found. 

Please add also instructions what sw needs to be installed in laptop. 

Thank you with big greetings 

Please accept my Best Regards. 
Vit Matrka, czech republic

MPPT 3375 Wp difference - adjust need.PNG

Edited by vitecekmatrka
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On 2021/01/31 at 6:23 PM, vitecekmatrka said:

The PV A input need an software adjustment. 

PV current shall be same on both inverters and it must cooperate to battery current if inverter is only in a charger mode. 

I think perhaps part of your main problem is that the battery voltage measurements are a little out of calibration. They all use the same battery (or they should), so they should read the same battery voltage. It may be possible to adjust the battery measurements so that they agree better, and therefore share the charge current better.

But really, it doesn't matter too much if one inverter has a larger or smaller share than the others. As long as the battery gets the charge it needs.

Adjusting the battery voltage calibration isn't exactly easy; instructions are here.

As for why two of your inverters are in standby mode and only one is in battery mode, I've not noticed that before. I'm not familiar with the Kings as yet; hopefully I'll learn a lot more about them soon. I'd say it's because you have such a low load (413 VA, 8% of one inverter's rated output) that it only justifies the overhead of one inverter; the others just charge the battery. Kings with their double conversion have relatively poor efficiency at low loads (especially AC-in to AC-out), so the firmware seems to keep some of them in standby to avoid wasting power. 

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9 hours ago, Coulomb said:

I think perhaps part of your main problem is that the battery voltage measurements are a little out of calibration. They all use the same battery (or they should), so they should read the same battery voltage. It may be possible to adjust the battery measurements so that they agree better, and therefore share the charge current better.

But really, it doesn't matter too much if one inverter has a larger or smaller share than the others. As long as the battery gets the charge it needs.

Adjusting the battery voltage calibration isn't exactly easy; instructions are here.

As for why two of your inverters are in standby mode and only one is in battery mode, I've not noticed that before. I'm not familiar with the Kings as yet; hopefully I'll learn a lot more about them soon. I'd say it's because you have such a low load (413 VA, 8% of one inverter's rated output) that it only justifies the overhead of one inverter; the others just charge the battery. Kings with their double conversion have relatively poor efficiency at low loads (especially AC-in to AC-out), so the firmware seems to keep some of them in standby to avoid wasting power. 

Dear Coulomb, 
I would like to instruct you, in your post, to add my remarks. 
First of all is that Standby mode is given by the main switch is off on 2 in standby mode. last one is inverting. Standby mode is a PV charger only or bypasss in case of last one death or switche off the pushbutton. 
Problem is not a battery voltage. 
Problem is that the inverter with SN ...243 has same Sout pannels field as the Inverter with SN ... 133 both have 5x3S jinko 225Wp. 
Both in real charging battery at same value ( same real power to battery) 
But the ..243 its measuring different charging current. 

Wel SCC is charging correctly on all of them, the only thing is that it measures different value in comparsion to the inverter No 3. 

Thank you for sending be intructions for calibration of voltage on battery.

As I told in different topic ( Axpert king or PIP 5048MK) i got 65 kWh battery and 20 kWp of pannels , 3 inverter in parallel ( 2 of them Im dynamically switching off not by sw but by the pushbutton hardware modiffication) to save 130W in total every hour, that means during 16 hours night close to 2 kWh only noload consumpion. If you are interested at I can prepare some prhotos  how I control them. 

So to summarize, They work very perfect. one of them just sending bad value ( measured ) of PV watts, in reality all of SCC MPPT works perfetly and charging on same power ( regarding to installed kWp on each one inverter)

Hope it helped a bit. 

Thank you and looking forward. 
Please accept my Best Regards, Vit
 

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6 hours ago, vitecekmatrka said:

Problem is that the inverter with SN ...243 has same Sout pannels field as the Inverter with SN ... 133 both have 5x3S jinko 225Wp. 
Both in real charging battery at same value ( same real power to battery) 
But the ..243 its measuring different charging current. 

Ah, OK. I deal with about 50 posts a day lately, and it's easy to forget the context.

That pretty much has to be the shunt resistors on the SCC, or something in the op-amp amplifying the shunt voltage.

This AEVA post shows a reader fixing his SCC, turned out to be a small resistor (not the shunt) and/or op-amp.

Edited by Coulomb
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