diy solar

diy solar

Repairing inverters...

When connecting battery the bms detects short and trips. The inverter doesn't see any battery voltage and multimeter doesn't see short across battery terminals. I'm yet to investigate but i hope its something simple.
Have you tried pre charging the inverter capacitors? Otherwise, the inrush to fill those caps is huge and will often trip the BMS over current protection.
 
Currently I’m repairing a “broken” Huawei Sun 2000 3KTL L1 that our installer (I work in a company that install PV in Italy) broke due to a inverted polarity on the PV input. We tried to ask Huawei to repair it, they had denied it and told to ask a third part company to repair it.
We had sent it and they declared that it’s irreparable.
Now it’s half working, only one MPPT of two. Now it’s in my garage and I’m trying to repair it using my skills learned on the appliances PCB and school-academic electronic and electrotechnics.
I tried to find some schematics or indication, the only documentation aviable are on a sketchy webpage that asks a payment to read it, I had considered it a scam. Huawei (asking as installer) do not gave nothing more than the manual / datasheet, same as SMA, Fronius, PowerOne, etc..

I wanted to open a thread on it but I had a problem with my diy battery and wanted to tidy up it before.
I will post the repair and updates on the “hybrid - grid tied inverter” section.
 
I notice several of the contributors to this thread are new members. I agree with all the sentiment expressed but I have found a distinct lack of interest in electronics on this site.

I recently repaired a Fronius GTI but there was no reaction to the thread at all so I simply stopped posting.
 
I have repaired two inverters this year so far, the diagnosis and repair were in two places.

Aurora Power one was on YouTube, lots to choose from.

The SMA SB2500 was finally found on GitHub where the schematics had been posted.

Both repairs ended up being the same, remove and replace the DC relay's.
 
I notice several of the contributors to this thread are new members. I agree with all the sentiment expressed but I have found a distinct lack of interest in electronics on this site.

I recently repaired a Fronius GTI but there was no reaction to the thread at all so I simply stopped posting.
Please keep posting. There's often no rhyme or reason to why some posts get ignored.
 
I notice several of the contributors to this thread are new members. I agree with all the sentiment expressed but I have found a distinct lack of interest in electronics on this site.

I recently repaired a Fronius GTI but there was no reaction to the thread at all so I simply stopped posting.
Don't feel too bad. Our knowledge of electronics exceeds the capabilities of approximately 99% of the people that come here. Most visitors are just after information about solar and how to make it work. I also used to post technical information and came to the same conclusion as you. It's not worth the time since nobody really cares.
 
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