LV5048 Kaput

[jasonhc73]

Today both my MPP-Solar LV5048's died.

Both are in parallel and ka-put.

Any ideas for trouble shooting?

The system was working perfectly and then just stopped. The system is capable of 10 kW, and at the time had about 1200 watts A/C output load, and about 800 watts DC-PV input.

I have good DC V. As soon as they are connected to the inverters the V is basically 1 VDC. I'm thinking dead capacitors.

Some sad pictures of DCV and ACV readings;

LV5048 Died - Google Drive

drive.google.com

 

[gnubie]

Are you saying the PV falls to one volt? Sounds like the solar charger side of the unit is fried. Could the array Voc have exceeded the LV5048's max PV voltage? If it is pulling the array to 1 volt there will be a lot of current flowing through the PV wire which you could measure with a clamp meter.

If battery voltage, then yikes. That can really only mean big current and the BMS tripping. If that's the case perhaps the inverter side is fried, ie shorted transistors.

 

[Mtour]

Have you tried bypassing the bms..

 

[jasonhc73]

Have you tried bypassing the bms..

That's what is next.

Are you saying the PV falls to one volt? Sounds like the solar charger side of the unit is fried. Could the array Voc have exceeded the LV5048's max PV voltage? If it is pulling the array to 1 volt there will be a lot of current flowing through the PV wire which you could measure with a clamp meter.

If battery voltage, then yikes. That can really only mean big current and the BMS tripping. If that's the case perhaps the inverter side is fried, ie shorted transistors.

Not the PV, the battery. I suspect the BMSes.

 

[jasonhc73]

Yuuuup, all the BMSs' mosfetts shit themself.

Back to the basic setup. The BMS is now just a cell monitor.

 

[solardad]

Yuuuup, all the BMSs' mosfetts shit themself.

Back to the basic setup. The BMS is now just a cell monitor.

@jasonhc73

I guess that is good news but it stinks the BMS failed. What BMS were you using?
Thanks

 

[jasonhc73]

@jasonhc73

I guess that is good news but it stinks the BMS failed. What BMS were you using?
Thanks

ANT-BMS sold by ICGOGO.
See my thread BYD-BMS;

BYD BMS

A no cut, no splice, plug-n-play. It has a screen, Bluetooth, and more settings in the app than we know what to do with. Will already reviewed this BMS. The Inside wires: The Outside Wires: Conclusion: Molex Micro-Fit 3.0 430251000 10POS 3mm Molex Micro-Fit 3.0 or 1729521001...

diysolarforum.com

 

[nwillitts]

damn jason,you freaked me out.

 

[GVSolar]

Sorry to hear that sir, small comfort, but better the BMS than the inverters or the batteries.
Like the man said, "Barn's burnt down... now I can see the moon."
Best...