Did I damage my inverter or batteries?
- Thread starter wolverine
- Start date
42OhmsPA
What's in a title?
More info needed. You back fed the AC input or output? Wiring diagram?
Solar is in the barn working fine, I wanted to see if i could run the pump in the house, i turned off main breaker in the house and ran solar to that box worked fine. I turned on main breaker to house without disconnecting solar, BMS fried? Thanks
42OhmsPA
What's in a title?
When you say solar is in the barn I'm assuming you mean the inverter, panels and batteries?... A diagram or photos would be very helpful.... So you fed/backfed AC from the inverter/solar in the barn to the house panel with the mains off and the pump ran, then you turned the mains on with the inverter/solar still feeding AC to the panel and the out of sync phases collided resulting in scent of magic smoke?
If the above assumption is correct you likely fried alot more than a BMS.
Did the mains breaker trip after you flipped it back on? What does the manual for your EG4 state for the error you are seeing?
NEpowerandlight
New Member
- Joined
- Sep 15, 2022
- Messages
- 119
Did you try to power a 240v pump with an inverter that outputs 120v?
crossy
Solar Addict
This is one reason that interlocked breakers and transfer switches are made.
Sending grid AC up the output of an inverter that's not designed for it is very often fatal to the inverter
It's a tough lesson, but most of us only do it once!
What does the inverter manual say about that error?
Sending grid AC up the output of an inverter that's not designed for it is very often fatal to the inverter
It's a tough lesson, but most of us only do it once!
What does the inverter manual say about that error?
The main did not trip. when i got back to the barn I disconnected the solar to the house, the inverter was running in bypass on acv, in the barn still had power to loads. all 3 batteries were tripped, tried to reset and reconnect to inverter with com cable, there was allot of clicking from batteries and all 3 trip-default code is 6p, battery is not connected. I think BMS is done, inverter is still running i will try user-defind tomorrow see what happens. thanks
crossy
Solar Addict
If you disconnect the batteries from the inverter do they still trip out?
Do they then have an output voltage?
Do they then have an output voltage?
Going to check tomorrow. Thanks for response.
crossy
Solar Addict
I do hope it all lives, but I'm not holding my breath
Signature Solar are active on the forum so they may be able to offer insight and a way to a (reasonably) economical fix.
Rest assured that you are not the first (and certainly will not be the last) to shove energy where it's not supposed to go!
Signature Solar are active on the forum so they may be able to offer insight and a way to a (reasonably) economical fix.
Rest assured that you are not the first (and certainly will not be the last) to shove energy where it's not supposed to go!
Quattrohead
Solar Wizard
You have blown the inverter, the CPU and bypass relays are still running OK.
Batteries should be fine, it's the 48v bus in the inverter that shat the bed.
Batteries should be fine, it's the 48v bus in the inverter that shat the bed.
crossy
Solar Addict
Yeah, my money is on there being a whole load of topless FETS and bits of plastic inside the box
To all Thank you for responding to my call for help. Checked batteries this morning and seem to be good, one bad inverter is better than 3- bad batteries. I am 69 years old and new nothing about solar, not even a smart phone. I did this project by my self, I could not find anyone who wanted to work, not even electricians. Even with this mistake I am happy with this project. If anyone from Signature solar could advise me on inverter repair or replace? And again Thanks
, one bad inverter is better than 3- bad batteries. I am 69 years old and new nothing about solar, not even a smart phone. I did this project by my self, I could not find anyone who wanted to work, not even electricians. Even with this mistake I am happy with this project. If anyone from Signature solar could advise me on inverter repair or replace? And again Thanks42OhmsPA
What's in a title?
@signaturesolarHelpUs see above.
RCinFLA
Solar Wizard
- Joined
- Jun 21, 2020
- Messages
- 3,574
If inverter was not active with AC voltage output nothing would likely happen, but if inverter was active and you jammed it against an out of phase AC source it can blow out the PWM H-bridge IGBT devices.
This is a picture of PWM sinewave generation H-bridge IGBT's that was subjected to grid applied to a running asynchronous inverter output. It also sometimes takes out the IGBT input gate opto-isolator driver devices.
By the way, an input transfer switch that immediately jumps between a generator and grid can do the same thing.
You have to let the inverter disconnect its pass-through relay on AC input before changing AC input source which can take some time for inverter to recognize AC input has gone away, leaving the pass-through relay engaged, subjecting the inverter to an abrupt AC input phase shift between generator and grid phase.
This is a picture of PWM sinewave generation H-bridge IGBT's that was subjected to grid applied to a running asynchronous inverter output. It also sometimes takes out the IGBT input gate opto-isolator driver devices.
By the way, an input transfer switch that immediately jumps between a generator and grid can do the same thing.
You have to let the inverter disconnect its pass-through relay on AC input before changing AC input source which can take some time for inverter to recognize AC input has gone away, leaving the pass-through relay engaged, subjecting the inverter to an abrupt AC input phase shift between generator and grid phase.
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