Has anyone else had issues with MPP Solar LVX6048 Battery Terminals? And also fan direction..??

[yrksolar]

So I'm about ready to implement 3 of the MPP Solar LVX6048 split phase inverters.
I happened to find this post, and I believe 1 or 2 others where the battery terminals seem to have a cold solder joint, or possibly just where soldered correctly:

Thread 'LVX6048 Battery Terminal'

Jan 22, 2024

This happened last year, but I finally got around to disassembling my burned out LVX6048. It looks like it was a bad soldering job that caused this issue, but I think the battery terminal design is just poorly designed. There is a little daughter board that the battery cables connect to, and then two bus bars jump that to the mainboard. There was black/burn marks on all four connections, but the negative pad on the mainboard won the race to release the magic smoke. Unit is out of warranty, so MPP Solar said all they can do is sell me a replacement mainboard. Not sure if the other Voltronic...

• iamrich
• Replies: 11
• Forum: Up in smoke... learn from my mistake!

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I plan on having a friend of mine redo the solder joints on them, and maybe add some potting to keep them stable when installing.

While I was taking 2 of the 3 units apart I noticed that the fan direction is actually pulling the hot air from the transformer and all the other components DOWN and out the bottom. (Note the fans are mounted at the bottom of the unit)

This seems very counterintuitive to me as you would think you would want to bring in the cooler air from the bottom and blow it out of the top of the unit.
Maybe I spent too many years building gaming computers

 

[Quattrohead]

You are right on on both accounts.

 

[yrksolar]

Thank you sir! I also just ordered some copper bus bars to replace the aluminum ones.

I also hear people comment on the noise that these make. Having not installed one yet, do you know if it is transformer noise, or fan noise, both?

I can always find some quieter fans I'm sure if that is one of the culprits.

 

[42OhmsPA]

When I was running my TP6048, same inverter, the fans were high pitched screamers. "Transformer" noise was minimal in comparison.

 

[yrksolar]

Thank you! Just the information I was looking for.

When I find something better i'll be sure to post a follow up thread.

I think i'm going to flip them so they are pulling in cool air from the bottom, and possibly add two more at the top to help pull the hot air out.

They are deep which is good for static pressure.

 

[42OhmsPA]

I'd monitor temps before and after. I'm sure there was some kind of logic and reasoning behind their madness.

 

[yrksolar]

Yes, great idea.

 

[fmeili1]

While I was taking 2 of the 3 units apart I noticed that the fan direction is actually pulling the hot air from the transformer and all the other components DOWN and out the bottom. (Note the fans are mounted at the bottom of the unit)

This seems very counterintuitive to me as you would think you would want to bring in the cooler air from the bottom and blow it out of the top of the unit.
Maybe I spent too many years building gaming computers

see my build thread about the same issue with all these "Voltronic Axpert Max" clones (I'm using EG4 6500EX-48, but the same with MPP Solar LVX6048). Beside my active cooling with a ducted mini split, the easiest thing is to 3D print some 45 degree windshields placed on the sides to separate the hot rising air from the bottom air outlets a bit from the upper cold air inlets. This will give you some positive cooling effect!