mrzed001
Voice of reason
Hi ,
OP bought and installed a new PowMr WM5k-III inverter about a month ago.
Used it with 9 solar panels:
- 6pcs of 410W, 49.5Voc, 40.9Vmpp
- 3pcs of 390W, 45.06Voc, 38.01Vmpp. One of them was connected to a TIGO optimizer (because of shadows)
All together 432Voc, (would be 475Voc in -10 Celsius), 359Vmpp (near the inverters ideal 320Vmpp)
So ideal for the MPPT specification.
DC fuse and DC overvoltage protection was on the PV string (there was no storm, no lightning).
And then in a sunny day ... the magic smoke escaped from the unit.
Cause unknown.
The MPPT part is heavily damaged. The DC bus is fried. And it even burned out the AC side.
We still do not know what caused this brutal malfunction.
Any ideas are welcome
Some pics from the motherboard of the inverter
OP bought and installed a new PowMr WM5k-III inverter about a month ago.
Used it with 9 solar panels:
- 6pcs of 410W, 49.5Voc, 40.9Vmpp
- 3pcs of 390W, 45.06Voc, 38.01Vmpp. One of them was connected to a TIGO optimizer (because of shadows)
All together 432Voc, (would be 475Voc in -10 Celsius), 359Vmpp (near the inverters ideal 320Vmpp)
So ideal for the MPPT specification.
DC fuse and DC overvoltage protection was on the PV string (there was no storm, no lightning).
And then in a sunny day ... the magic smoke escaped from the unit.
Cause unknown.
The MPPT part is heavily damaged. The DC bus is fried. And it even burned out the AC side.
We still do not know what caused this brutal malfunction.
Any ideas are welcome
Some pics from the motherboard of the inverter