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Axpert MKS II 5kW Error 08


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On 2020/04/12 at 3:31 PM, charlez said:

@Coulomb thanks for this info. But as you said earlier they may provide a setting later using SOC. What software are you using to manage your inverters? This is what I can get out of my Narada batteries. Just passing a couple of fields to emoncms and not being used. Using the voltage to switch and not ideal.

temp::[31.0, 32.0, 31.0, 31.0] C
soh::100.0 %
status::[[], [], [], [('Charging', True)]] flag
packvolts::53.61 volts
soc::100.0 %
capacity::112.76 ah
addr::[1] BID
current::2.44 amps
cell_volts::(53.61300000000001, [3.554, 3.564, 3.567, 3.558, 3.549, 3.561, 3.564, 3.551, 3.567, 3.609, 3.613, 3.601, 3.587, 3.586, 3.582]) volts
cycles::330 cycles
 

Hi Charlez/ Everyone,

First off I want to thank each and everyone here for this create post and contribution to the community. I also started to get this 08 error and this has help me tremendously. @Charlez is it possible to give me more info regarding how you got the info from your Narada BMS? Did you use specific command protocol or does this automatically send for example every few seconds? Did you use RS485 or RS232? I tried searching all over the internet and could not get any info on this or command protocols. I could get for polyntech but nothing for Narada. Thanks in advance. 
 

Quintin

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On 2020/11/17 at 10:35 AM, HermanD said:

Enable an AC charge current of only 2A and switch the inverter charge priority to "Solar First"

Very interested in this potential solution Herman.

Are you referring to setting 11 - Maximum utility charging current to be set to 2A and setting 16 - Charge source priority to be set to CSO instead of OSO?

With OSO only solar can charge batteries but with CSO, utility can also charge if there is no solar

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On 2020/11/17 at 1:35 PM, HermanD said:

I had the same issue with the Error8 when my inverter(s) are in bypass mode, no solar input from panels and rain in the air.  My approach to solve (hide) this is to not add any additional hardware to the setup.  Enable an AC charge current of only 2A and switch the inverter charge priority to "Solar First".  The MKSII inverter can only charge from AC when in bypass mode, thus it will not use the AC charging when there is still battery available.  AC charging will not be used in bypass mode with solar availability.  The 2A AC charge setting is only enough to bias the inverter and do not really charge the batteries over the night period (My batteries SOC will go up with 1% maximum after about 10 hours on bypass).  After enabling these settings on my inverters I have not experience Error8 again for the entire winter (lots of rain and bypass mode incidents).  I hope this helps a few of you.

Thats a good solution too if one has batteries

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  • 2 weeks later...
On 2020/12/01 at 8:50 AM, Smirresa said:

Very interested in this potential solution Herman.

Are you referring to setting 11 - Maximum utility charging current to be set to 2A and setting 16 - Charge source priority to be set to CSO instead of OSO?

With OSO only solar can charge batteries but with CSO, utility can also charge if there is no solar

Hi Smirresa,

Yes, setting 11 set to 2A and setting 16 set to CSO.  In CSO the inverter will only charge from utility in bypass mode when there no solar.  If you are in bypass mode, but there is solar (cloudy day with batteries low), then the AC charge will not occur.  If you are running from batteries and no solar (at night time) then the AC charge will not occur.  AC charging will only work when you are in bypass mode and no solar.

Regards

 

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  • 3 weeks later...
On 2020/12/15 at 10:55 AM, HermanD said:

Hi Smirresa,

Yes, setting 11 set to 2A and setting 16 set to CSO.  In CSO the inverter will only charge from utility in bypass mode when there no solar.  If you are in bypass mode, but there is solar (cloudy day with batteries low), then the AC charge will not occur.  If you are running from batteries and no solar (at night time) then the AC charge will not occur.  AC charging will only work when you are in bypass mode and no solar.

Regards

 

 

Thanks Herman

Implemented this solution on two separate systems in two different parts of the country on the 1st of December, when I first saw the post.

No error 08 messages on either of the systems since then, despite intermittent cloudy and wet weather.

Seems like a lasting solution. If anything changes I will give feedback

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  • 2 months later...

Hi, wondered if there was any new feedback on this? Similar issue on Growatt, but mostly 11:00 morning starts to trip- not load related, and not only during rainy days. Did have utility charge set high (40amp) especially during latest loadshed again to not be caught out, have dropped it to 10A.

In this case it is 2x 5kW in parallel- and mostly one of the two that always error 8.

 

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  • 2 months later...
On 2021/03/20 at 8:17 PM, Igubu said:

any new feedback

The solution Herman proposed definitely solved the 08 (and 04) errors/problems on the Axpert inverters. Not a single error or trip since making the changes in Dec 2020. Not familiar with the Growatt inverters

On 2021/03/20 at 8:17 PM, Igubu said:

In this case it is 2x 5kW in parallel- and mostly one of the two that always error 8.

I had the problem on two systems. One with 2 x 5kVA in parallel and the other with a single 5kVA unit.

As far as I remember, for the dual system, the 08 error mostly occurred on the master inverter

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56 minutes ago, Smirresa said:

The solution Herman proposed definitely solved the 08 (and 04) errors/problems on the Axpert inverters. Not a single error or trip since making the changes in Dec 2020. Not familiar with the Growatt inverters

I had the problem on two systems. One with 2 x 5kVA in parallel and the other with a single 5kVA unit.

As far as I remember, for the dual system, the 08 error mostly occurred on the master inverter

The Growatt has the same axpert designed mainboard- many similarities:)

on the positive side the friend with the same issue has not seen it since the same change was done approx 7 weeks ago! So I reckon this is a design fault in the board- but will Growatt refund because of it? Difficult to prove, but I’m of the opinion grid charge is a feature that has to work as designed.

 

 

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