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How to charge multiple batteries in a strange configuration? Answered

Hi all, 

Basically I'm planning on making an electric motorbike within the next year or so and need to know how to charge the batteries.
I'm planning to have 8 batteries altogether, 4 batteries connected in series, then the 2 sets of 4 connected in parallel to up the capacity.
How would I go about charging this configuration?
The batteries are going to be high capacity, deep cycle sealed lead acid batteries.

Cheers,

- Will

Discussions

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iceng
iceng

5 years ago

Mixing different capacity batteries is a very bad electrical drive power decision.

Mixing different capacity identical batteries is only a bad electrical drive power decision.

Charging them as one group will destroy some of the batteries and possibly your garage and home.

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petercd
petercd

5 years ago

What voltage and amp hour rating is the 4 series config, 48V? 105amp hour?

If so, you will need a 48V capable charger that can handle the combined parallel amperage, ie 210amp hr capacity.

Remember to take the charge rate into account too.

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rickharris
rickharris

5 years ago

8 deep cycle lead acid batteries? Have you calculated how much these will weigh?

For an electric vehicle light weight = range and acceleration. Your probably better off going fro a much lighter weight set up and fewer batteries that will be easier to charge.

I agree with Steve on the charging. Different batteries will have different discharge/charge characteristics trying to charge them all as a block is going to lead to problems.

Our electric racing car used 2 deep cycle batteries - giving use about 2 hours at 30 MPH.

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steveastrouk
steveastrouk

5 years ago

It's not a good configuration, and tends to lead to an early death for once or more batteries. If the batteries are new and identical, they can 'work', but its not good.

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artworker
artworker

5 years ago

Before applying mpilchfamily's technique. Just make sure all the batteries are at the same voltage (each one seperately).

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mpilchfamily
mpilchfamily

5 years ago

The same way you would any single battery of the total output voltage and type.