THERED117
Sparky, Sparky, yeah, yeah, yeah
Removed battery terminals and read the ohms across the pos neg on the inverter. Both inverters are dead.
Need help! System is down
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Adam De Lay
Solar Wizard
I thought you said you had one inverter working and you could limp along till #2 got replaced?
THERED117
Sparky, Sparky, yeah, yeah, yeah
Was. It died about 3 hours later.
THERED117
Sparky, Sparky, yeah, yeah, yeah
Adam De Lay
Solar Wizard
I wonder if it was only running off PV power then and not battery power?
THERED117
Sparky, Sparky, yeah, yeah, yeah
I'm 100% dead in the water. Been staying at the inlaws and going out to the house morning and evening taking care of the animals. Wife is about to go crazy.
THERED117
Sparky, Sparky, yeah, yeah, yeah
Possible. Not sure. I would love to open one up and see what the hell happened.
timselectric
If I can do it, you can do it.
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There should be a fuse just above the battery terminals. I would look to see if it blew.
timselectric
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That reading could be from the capacitors on the terminal board. (Between the terminals)
THERED117
Sparky, Sparky, yeah, yeah, yeah
Can I remove the cover to check? It's not accessible with out removing the panel.
THERED117
Sparky, Sparky, yeah, yeah, yeah
I've thought of that too. I don't want to screw up a warranty but digging too deep.
timselectric
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On my Growatt, I can see the fuse by looking up through the bottom removed cover. (Through the ventilation openings)
Not sure on those units.
Not sure on those units.
timselectric
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Actually through the fans, on mine.
THERED117
Sparky, Sparky, yeah, yeah, yeah
Ok. I'm not there right now but I will be in a little while. If the battery cables are connected the battery brekers will trip. With them removed I can power on my batteries.
THERED117
Sparky, Sparky, yeah, yeah, yeah
You can see it by looking through the ven fans too
Batavian
New Member
No one else has this on their display? Mine has it on 2p1 only, was thinking it was because the battery com cable was connected to that inverter.
Any answers?
Hedges
I See Electromagnetic Fields!
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Would certainly like to know what blows FETs in an inverter.
Reverse polarity would do that, but they ran for a few months so not reversed.
Fuse? That would show open.
Yes, shorted caps would be zero ohms too.
Overheating from overload could kill FETs. Caps can short, maybe if over-voltage or over temperature (which can occur from high ripple, e.g. running full load for an extended time, if not designed to handle that.)
We have switch-mode bench supplies at work, and have blown a few powering inductive loads. Consider what yours drive (inductive or otherwise), and how they are switched.
Maybe if an inductive load is connected and disconnected, resistive loads absorb the energy (limited higher voltage to drive the extra current.) But if no resistive loads, voltage across FETs spikes much higher.
There are various designs of "snubber". I designed an amplifier to drive RF into a capacitive load and was paranoid about that. I put diodes clipping output voltages beyond the rails.
Wonder if just load-dump causes inverter to hurt itself?
Reverse polarity would do that, but they ran for a few months so not reversed.
Fuse? That would show open.
Yes, shorted caps would be zero ohms too.
Overheating from overload could kill FETs. Caps can short, maybe if over-voltage or over temperature (which can occur from high ripple, e.g. running full load for an extended time, if not designed to handle that.)
We have switch-mode bench supplies at work, and have blown a few powering inductive loads. Consider what yours drive (inductive or otherwise), and how they are switched.
Maybe if an inductive load is connected and disconnected, resistive loads absorb the energy (limited higher voltage to drive the extra current.) But if no resistive loads, voltage across FETs spikes much higher.
There are various designs of "snubber". I designed an amplifier to drive RF into a capacitive load and was paranoid about that. I put diodes clipping output voltages beyond the rails.
Wonder if just load-dump causes inverter to hurt itself?
THERED117
Sparky, Sparky, yeah, yeah, yeah
SS kinda confirmed the same theory.
timselectric
If I can do it, you can do it.
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It's directly above the positive terminal. Bolted between the terminal bar and the circuit board. It looks like a short piece of bus bar that is narrowed in the middle.
It's more of a fusible link, than a fuse. But serves the same purpose.
THERED117
Sparky, Sparky, yeah, yeah, yeah
The day before I had a breaker trip. That's when the current limiting setting changed. The next morning I did a controlled shutdown and start up to see if "turning it off/on would fix it.
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