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Par Pip 4048 - pylon us3000 - error 08 - DC bus voltage High


Cybertza
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Hi Guys

I would really appreciate some input from the experts here:

I have 2 x pip4048 2015 units. Getting the fun error 08 regularly now. Have tried quite some things to try and resolve it. 
 

I have confirmed that I have DC runaway on the bus.

But I don’t know if that’s the issue inverter thinks battery is at 53% but pylon thinks it’s at 100% therefore the inverter wants to offload overvolt to the battery there but battery doesn’t take amps as it’s close on full. Getting me to this issue since it is unable to get the voltage down in the allotted time. I have tested multiple firmware’s LC builds.

 

Any insights would be highly appreciated.

 

 

 

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43 minutes ago, Cybertza said:

I don’t know if that’s the issue inverter thinks battery is at 53% but pylon thinks it’s at 100% therefore the inverter wants to offload overvolt to the battery there but battery doesn’t take amps as it’s close on full.

No, that's just the silly Axpert "SOC" guess-o-meter. It does at times push power into the battery in an effort to reduce the bus voltage, however. I don't think it takes the battery voltage into consideration when doing this; it's an emergency situation.

43 minutes ago, Cybertza said:

I have tested multiple firmware’s LC builds.

Have you tried factory firmware, in case it's a bug in the patched firmware? For example, in the folder where you unzip dsp_LF1_73.00e.zip to, delete dsp.hex, duplicate dsp_original_73.00.hex, and rename the copy to dsp.hex. Then flash the firmware again, and you'll get the latest factory firmware (that I know of) for your hardware (same hardware as mine).

Edit: The other possibility is that the bus soft start power supply isn't turning off, or is turning on at night.

Edited by Coulomb
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So i based my testing on the way that i understood the bus deals with Over Volt, that it wants to dump it into battery, but since the battery is Charged up the battery does not take the charge.

I set the Bulk(cv) and Float to 50 for a day, No problem occured, Bus never over 405v.

Then over the next few days, i edged the two values up to 53v. 

I have not had the error again. So ultimately i believe that it was a result thereof, that the PYLON gets full, and like any battery refuses to take more charge, this causing runaway on the DC bus. 

Will monitor it for a few more days and report back, then move onto the latest custom firmware again.

All this testing was done on LF1 72 70C

 

Edited by Cybertza
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  • 6 months later...

I am having a similar issue with my inverter setup:

1. MUST 5KVA 
2. 12x 330W Canadian Solar Panels
3. 2x Pylontech US3000 batteries

We have had no power due to a fault for some a few weeks so have been running on panels during the day and batteries at night. I have noticed that if i turn over to generator at the end of the day after the batteries are charged (needed to run my stove), the error comes up on the inverter after about an hour or two of running the generator. Yesterday we had our grid power restored in the afternoon after the fault was repaired. In the evening when batteries were fully charged and still on grid power, the error came up again. Had to restart the inverter and switch off grid power, so that batteries were no longer charging. 

Any suggestions as to what I can try?

Regards Sheyn

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8 hours ago, Sheyn said:

the error comes up on the inverter after about an hour or two of running the generator.

Any suggestions as to what I can try?

Try isolating (disconnecting) the solar panels at night. If yours is a 450 V max PV model (you didn't say), these have an issue where leakage to earth can cause superimposed voltage to rectify somehow and pump up the bus voltage.

See this post, which leads to this post with a solution (if you are handy with electronics). The second post has a lot more discussion about the issue if you are interested.

If yours is a 145 V max PV model, then this won't be the issue, and disconnecting the panels at night won't help.

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