Victron overload alarm

[G1969]

This is a question for Roger/ Nigel at off grid or any other knowledgeable person please.

I got an overload alarm on the multiplus yesterday. The heating was on 2000w, fridge on say 240w, then the wife put the kettle on -another 2000w, so pulling 4300w or so. I was plugged in to a 16amp supply, and set the limit to 16amp, the multiplus was assisting making up the 800w or so difference. Is all this too much for the wiring, should I not be going over the 16amp limit?

 

[bigtwin]

What size is your multiplus?

Ian

 

[AdrianChen]

Was the charger going at the same time? Then you would have for EG 120amps charging = 1500w plus your load of 4300=5800 of which 3840ish would be from ehu and around 2000 plus a bit more for losses from the inverter running at full tilt?

If the cables to feed the inverter (assuming 3000VA version) are correctly sized, say 95mm but not 50 or less then I guess all is well.

If the battery was full, and no charger current running was there a further warning about "ripple"?

 

[G1969]

What size is your multiplus?

Ian

3000

 

[G1969]

Was the charger going at the same time? Then you would have for EG 120amps charging = 1500w plus your load of 4300=5800 of which 3840ish would be from ehu and around 2000 plus a bit more for losses from the inverter running at full tilt?

If the cables to feed the inverter (assuming 3000VA version) are correctly sized, say 95mm but not 50 or less then I guess all is well.

If the battery was full, and no charger current running was there a further warning about "ripple"?

No I think the batteries were charged, as this was the following morning, so charged overnight. No additional warning ?

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[AdrianChen]

Was the charger going at the same time? Then you would have for EG 120amps charging = 1500w plus your load of 4300=5800 of which 3840ish would be from ehu and around 2000 plus a bit more for losses from the inverter running at full tilt?

If the cables to feed the inverter (assuming 3000VA version) are correctly sized, say 95mm but not 50 or less then I guess all is well.

If the battery was full, and no charger current running was there a further warning about "ripple"?

PS. at least it wasn't an alarm, just a warning so you were aware....

 

[WESTY66]

I didn’t get an overload alarm but I stick my head into the garage one day whilst we were away and I heard the multiplus making a hell of a racket, I shouted Mrs Westy “Oi what you got on in there” “microwave, kettle and air fryer, why?” Wtf woman, two out of three ain’t bad, turn one off!!! women and electrics eh, I’m sure she thought she was at home

 

[AdrianChen]

Ok well the battery should cope fine with 800w, so if ehu was working, then I think I would connections and fuses. If you get another warning, you could carefully touch the cable ends and fuses to see if one is hot.

Sorry not much help.

The question about ripple was about some bms that when full the battery output picked up some interference from the bms cutting charging in and out causing high ripple in the output. Way beyond my understanding, but thought I'd ask.

Does Vrm show any history that shows what the battery was doing?

 

[G1969]

Ok well the battery should cope fine with 800w, so if ehu was working, then I think I would connections and fuses. If you get another warning, you could carefully touch the cable ends and fuses to see if one is hot.

Sorry not much help.

The question about ripple was about some bms that when full the battery output picked up some interference from the bms cutting charging in and out causing high ripple in the output. Way beyond my understanding, but thought I'd ask.

Does Vrm show any history that shows what the battery was doing?

Thanks Adrian, I can not see anything, I will just put it down to wife error!!, what would you say is the total limit? I have 560 lithium

 

[WESTY66]

Thanks Adrian, I can not see anything, I will just put it down to wife error!!, what would you say is the total limit? I have 560 lithium

It’s ALWAYS wife error

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[AdrianChen]

The multi inverter will do a constant 2400w I think, and you're battery 250 amps, so I guess it might be worth checking what the low voltage alarm is set to in the multi, I can't member the default, but do remember fiddling with it!

But unless the system was set to inverter only 800w shouldn't drop the voltage that much I'd have thought.

I'll see if I can see what's in the manual about the defaults after dinner.


OK well the default in VE.Configure 3 sets Low voltage alarm to 10.9v (shutdown at 9.3v). I must have upped that because mine is currently set to 12.8v with shutdown at 12.5v. Pretty sure the battery would shutdown itself around then. I suppose the installer would have set "sensible" values when installing the system.

Still no help/answer, however blaming the wife is always a good thing!