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Two LifePo4 battery packs I need to switch between, suggestions?


BritManToo

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So I have 2x 48V packs that don't seem to work well connected in parallel, but work fine seperately.

Would like to switch between them, so only 1 connected to inverter at a time.

 

DC switch than can handle 100A, just switch the positive wires, and not expensive.

Any suggestions for a product on Lazada/Shoppee?

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1 hour ago, Crossy said:

Daft thought.

 

Do your BMS's have an on-off switch you can use to isolate one or other pack?

The BMS have a mind of their own and will switch on when they feel like it.

I don't trust their software switches.

Edited by BritManToo
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1 hour ago, sometimewoodworker said:

Also a switch that can handle 48v 100A through it is a very different beast to one that will switch that load. So if you can stop the load and switch you will have an easier time.

I do have a breaker between inverter and battery packs, so I can remove the load while switching batteries ........ and my normal DC load is 5-10A.

Edited by BritManToo
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7 minutes ago, Crossy said:

Great minds and all that carp ???? 

 

It's not rated to actually switch DC, but if the load is small when you switch, I reckon it will be the cheapest way to go.

 

 

I think I only need to connect the positive, the 2 batteries can share the negative 24/7.

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1 minute ago, BritManToo said:

I think I only need to connect the positive, the 2 batteries can share the negative 24/7.

 

Yeah, no issues doing that. You could also run the two poles in parallel for extra safety margin.

 

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General wisdom is that an AC rated switch can handle about a tenth of the AC voltage rating on DC.

 

These knife switches have a large contact clearance so are probably capable of a much larger AC voltage than they're rated for (insulation notwithstanding).

 

Move it briskly when swapping and give it a try.

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