Battery powering screen is ok (low voltage). Pv powering screen means the connection from high voltage to low voltage is working. Maybe the high voltage bus to inverter is faulting. Lots of capacitors there, so not diy friendly repair.
Lol has anyone actually gotten the password on these forums? I didn't try but it could be 0000 for all I know.
Capacitors usually blow correct? Blown capacitors in my experience emit alot of smoke and residue and will smell bad in the box forever basically lol. Neither was detected inside this unit from basic opening of panel. Is there some other way the DC bus could fail less noticeable from over voltage? Also not so DIY, working with capacitors is fairly common for me.
Usually the AC PWM IGBT H-bridge devices. They often take out the gate drivers also. If they short out, they can also blow out the battery side MOSFET's.
This is exactly the kind of info I was hoping for, Thank you!. Have people had luck finding replacement components and soldering new ones in?
Wouldn't they just freewheel and passively rectify incoming AC into DC and charge DC bus capacitors? The IGBT body diodes in inverter H-bridge look like they form a bridge rectifier.
That, I do not know?
Trust me, I don’t want to share the thoughts I had, when I learned that…
What if the inverter is on and not frequency/voltage synchronized?
Then thing goes BOOM!
I don't think the battery input is shorted, the battery seemed to handle being hooked up okay, granted I didn't check for dead short and I should have but it read like 53V on the screen so I doubt it's shorted
Ah ok. Well if you wired the AC onto the wrong end I’m not sure the inverter can be blamed for not detecting the AC and refusing to start.
The inverter has to be active, independently putting AC output with battery power that is out of sync with applied AC on output terminals to blow the H-bridge IGBT's.
My point is that you may have large energized capacitors that need to be discharged before working on the board. Not that they have blown.
Gotcha, yeah that's something I can handle assuming I could find the issue and it seemed fixable
Wait so that's quite different than just reversing the wires and turning on?
What do you mean by reverse? Wire to AC out instead of AC in?
I'm not sure I'm just trying to get to the bottom of that the other person is talking about as far as this potential failure to judge how likely it is to be related to my issue based on the difference in Inverter architecture and likelihood of someone doing it on accident. For example if he means feeding the load side with grid once everything is already on and working correctly then that seems unlikely to be done on accident but if he means just simply reversing grid and load during installation and then turning on can cause this then its more likely which then tells me to dig deeper for damaged fets or igbts
