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Burning electrical smell! Victron Multiplus 24v

satanas

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Joined
May 6, 2021
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17
Hey all,

I've searched all around and can't find anything regarding what's going on in my setup. I have an off-grid system in a travel trailer that has been working incredibly all year. It's 4x SOK batteries wired in series-parallel; the system is 24V/200Ah. 4x 200W rich solar panels, a lynx distributor, step down converter, victron battery shut-off protect and a bunch of other little things and of course the Victron Multiplus 24V/3000W that this post is about!

Over the last couple days, I've noticed a burning electrical smell when I power on the inverter and hit it with some loads. Needless to say, it hasn't been on long! I checked all the connections and they all seem tight. Right before this, a friend was watching my rig and noted the batteries kept draining/ weren't adequately charging, but I think what was going on was that whatever is happening with the inverter was alarming the rest of the system and it was shutting off in response.

Also, when testing it earlier I had all DC appliances shut off and put a few loads on the inverter (steadily increasing in amperage) while observing the inverter with the face plate off. Nothing smoked and nothing smelled. But I tried again later with a few 12V lights on and the smell happened almost immediately. Could it have anything to do with DC loads and AC loads occurring simultaneously?

Let me know if anyone has any recommendations or troubleshooting ideas/ if any of the above theories may be a lead to something. Apart from the smell, it continues to power loads like normal, but I haven't left it on and running long enough to see if anything else weird happens.

Please let me know what you all think. I really appreciate it!
 
Last edited:
Hey all,

I've searched all around and can't find anything regarding what's going on in my setup. I have an off-grid system in a travel trailer that has been working incredibly all year. It's 4x SOK batteries wired in series-parallel; the system is 24V/200Ah. 4x 200W rich solar panels, a lynx distributor, step down converter, victron battery shut-off protect and a bunch of other little things and of course the Victron Multiplus 24V/3000W that this post is about!

Over the last couple days, I've noticed a burning electrical smell when I power on the inverter and hit it with some loads. Needless to say, it hasn't been on long! I checked all the connections and they all seem tight. Right before this, a friend was watching my rig and noted the batteries kept draining/ weren't adequately charging, but I think what was going on was that whatever is happening with the inverter was alarming the rest of the system and it was shutting off in response.

Also, when testing it earlier I had all DC appliances shut off and put a few loads on the inverter (steadily increasing in amperage) while observing the inverter with the face plate off. Nothing smoked and nothing smelled. But I tried again later with a few 12V lights on and the smell happened almost immediately. Could it have anything to do with DC loads and AC loads occurring simultaneously?

Let me know if anyone has any recommendations or troubleshooting ideas/ if any of the above theories may be a lead to something. Apart from the smell, it continues to power loads like normal, but I haven't left it on and running long enough to see if anything else weird happens.

Please let me know what you all think. I really appreciate it!

Is it just the silicone smell (like from control boards) or the burned rubber smell (like cable insulation)? Have you checked all the fans in the equipment to confirm they are spinning? Does any of your equipment have temperature sensor readouts in them? Perhaps an infrared temp gun to manually check some key places. Are all the fuses/breakers spec'd out proper for the cable sizes (breaker/fuse 20% smaller than wire ampacity limits), etc...
 
Disconnect your step down converter and test without it in the chain.
Those step down boxes can fail in fun and exciting ways that end up taking out other things in the chain.
 
Is it just the silicone smell (like from control boards) or the burned rubber smell (like cable insulation)? Have you checked all the fans in the equipment to confirm they are spinning? Does any of your equipment have temperature sensor readouts in them? Perhaps an infrared temp gun to manually check some key places. Are all the fuses/breakers spec'd out proper for the cable sizes (breaker/fuse 20% smaller than wire ampacity limits), etc...
Hey! Thanks for the response. It's difficult for me to differentiate those smells, but if I had to wager it would be more of a hot rubber smell than the frying of silicon. I finally set up the app which I didn't have before and no problems were detected. I tested with the inverter turned on while all the breakers were off and there was no smell detected. When I turned the AC breakers on, the smell began. So I'm wondering if its an issue in the wiring between the main AC breaker and the inverter. I have multiple circuits and 6/3 wire running between the inverter and the main breaker in a furrion 120v/12v ac panel. All the cables/fuses should be good barring some tremendous oversight ; I posted here while planning out the system and it's archived
 
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Disconnect your step down converter and test without it in the chain.
Those step down boxes can fail in fun and exciting ways that end up taking out other things in the chain.
Thank you - I'll give this a shot and report back
 
Any photos of the install? What size battery cable did you use?
 
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