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I am installing a (new out of the box) Multiplus II 12/3000 on my boat. I have only connected the DC plus and minus (in order to setup the Multiplus before connecting AC). As soon as I connect the DC breaker, the Multiplus trips the battery shortcut protection. The Multiplus on/off switch is off when this happens.
Any ideas?
Thanks,
Villy
PS. It's not reverse polarity.
Hi @villychr
This will be the Multi filling it's capacitors. They're large and take quite a hit.
If you have a spare 12V Pb battery handy, try jumpering it across to precharge them, then switch in your main battery. Usually comes with a spark.
If you're going to do this regularly you could arrange a precharge circuit, Some Li battery makers even have such in their product range, but it's just a resistor really.
With thanks
Villy
A precharge done that way only takes the spark. Quick.
Does your bms need resetting or something? V on the Multi terminals? I don't know, you'll have to delve..
If yes, I think I have a problem with the Multiplus.
Possibly not, I don't think it would pass relay tests without being correctly wired. It's best to follow the instructions and wire it properly before jumping the gun and trying to make it work before it is ready.
Same applies for people trying to install it without batteries..
Even without lights, if you haven'r tripped your battery, you should be able to talk to it via a mk3 adapter and veflash.
It does sound like your battery BMS has not enjoyed the precharge, which will occur even if the multi is set to off.
Another common mistake, is having the rocker switch in the wrong "charger" position, instead of "on"
