Axpert settings

[Asto]

Hi,

i have an installed a mecer axpert 5kVA inverter, 4xUS2000 pylontech,10x 340W solar panels.

the only settings availability in terms of priority are U, SBU and S only. I have selected SBU as per the client's request but Utility is charging the batteries whenever the sundisappears,it is not using batteries.What could be the problem

setting 12 - 47.5V

setting 13- 52.2V

setting 26- 53.2V

setting 27 - 51V

setting 29 - 46.5V

[Coulomb]

3 hours ago, Asto said:

setting 12 - 47.5V

setting 13- 52.2V

? All Axperts I've seen only allow whole volts for the above settings. Is this a really recent model perhaps? I recommend 48 and 50 V respectively.

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setting 26- 53.2V

This is the manufacturer's recommendation, but it's too high for Axperts. The consensus seems to be around 52.5 V.

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setting 27 - 51V

This one could go up a bit to 51.8 V.

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setting 29 - 46.5V

When this setting is higher than 2 volts less than setting 12, it overrides the effective value for setting 12 (to setting 29 plus 2.0 V). This could be part of the problem. However, 46.5 V is my recommended value for this setting (so setting 12 needs to go higher).

The other undocumented behaviour is that once the inverter is in line mode (AC-in connects to AC-out, so the utility powers the loads and enables utility battery charging), it won't stop using utility power till the battery voltage reaches 4.0 V more than the value in setting 29 (hence 50.5 V).

Edit: However, whatever is in setting 13 (back to battery voltage) is likely keeping it in line mode even longer.

Edited August 14, 2020 by Coulomb

[Asto]

Thanks for the information,its a recent model (those with high PV input voltage). I will try your recommended values and advise you on the results!

[Beat]

29 "Low DC cut off voltage" 46.5 V  is set way to high. It should be 41 or 42 V. This might be the reason for continuous charging.

 

[Beat]

I just installed an Axpert MKS 5K (5 kW) with 9 Canadian panels and 9.6 kWh Li-Ir-Pho battery. So far it works well. But when fully charged and reached the floating voltage it cuts off the solar panels and discharges the battery with the load down below 90%. It should maintain the floating voltage but it doesn't. I went trough the entire manual but could not find any clou. Can anybody help?

 

Edited August 22, 2020 by Beat

[Beat]

I think I solved the problem thanks to the fact that I installed the remote control panel in my home office. So I can monitor the inverter as well as the batteries.

I cranked 27 (floating voltage) up to 54.5 V but left 26 (bulk charging voltage) at 54 V. Now it switches the panels on and off and maintains about 51.5 V and never reaches more than 53 V.

Anyhow it looks like I need more batteries to be able to collect all the solar energy of a day and maintain during the night.

[Asto]

On 2020/08/14 at 3:30 PM, Asto said:

Thanks for the information,its a recent model (those with high PV input voltage). I will try your recommended values and advise you on the results!

thanks @Coulombyour magic worked out.