Nasa BM2

[Sapphal]

Hi All

I have a bank of 5 x 110A leisure batteries and have acqiuired a Nasa BM2 battery monitor.  This has a 200 amp shunt and a cable presumably rated for 200 amps.  However, the cable supplied is considerably thinner than the cable from the batteries.  I have a 2kw inverter.

Questions is.

Can I just fit alarger cable to the shunt?  I am not going to pull more than 200 amps from the batteries.

TIA

[Richard10002]

6 minutes ago, Sapphal said:

Hi All

I have a bank of 5 x 110A leisure batteries and have acqiuired a Nasa BM2 battery monitor.  This has a 200 amp shunt and a cable presumably rated for 200 amps.  However, the cable supplied is considerably thinner than the cable from the batteries.  I have a 2kw inverter.

Questions is.

Can I just fit alarger cable to the shunt?  I am not going to pull more than 200 amps from the batteries.

TIA

The cable supplied doesn't carry the full current. The shunt sits in the negative battery cable, which is what carries the current. Fit it as per the instructions and it will be fine.

[Old Son]

and clean your battery terminals!!

[blackrose]

Yes, they're in a terrible state...

[Alan de Enfield]

Interested to know what the 2x Crocodile clips with very thin leads are for ?

[mrsmelly]

20 minutes ago, Alan de Enfield said:

Interested to know what the 2x Crocodile clips with very thin leads are for ?

My guess would be an mains battery charger? how say you?

[Alan de Enfield]

Just now, mrsmelly said:

My guess would be an mains battery charger? how say you?

That's what I assume (and hoped it wasn't), but you never know - it may be for a 'roving' 12v inspection lamp.

[Sapphal]

Thanks for the info re the BM2.

I don't know what the croc clips are for they were there when i bought the boat.  Strangely they are doth connected to the starter battery +ve (left of picture).  Perhaps to be used as an emergency jump to the starter battery?

Yes, I intend to clean and grease all the battery terminals and generally clean the whole battery compartment.

Thanks to alll

[Alan de Enfield]

1 hour ago, Sapphal said:

Perhaps to be used as an emergency jump to the starter battery?

I suggest you don't try it - you will just end up with a heap of melted and shorted cables and (probably) toxic smoke.

[Sapphal]

2 minutes ago, Alan de Enfield said:

I suggest you don't try it - you will just end up with a heap of melted and shorted cables and (probably) toxic smoke.

I agree - they look far too thin, I will remove the wires when I clean up the battery terminals.  If I ever need to jump the starter, I will use proper heavy duty jump leads.