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Charging multiple 12v batteries Answered

I have eight 12v 18Ah SLA batteries that I need to wire to get 48v. I need to be able to charge them all at once, but can't find a 48v charger anywhere. Is there a way I can wire a 12v charger to parallel charge the batteries while they're wired in series?

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iceng

2 years ago

Here is a simple three battery set wired to a Cinch 10 pin receptacle and a 10 pin Cinch plug. One way the batteries are in series = 36V, pull the plug rotate it by 180' and plug it in and you have all batteries in parallel.

Click the pic to see the entire image.

If this is interesting I can look at doing this with four batteries. Of course each of my battery representation is two of yours in permanent parallel.

12v-3g-cinch3.JPG
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steveastroukiceng

Answer 2 years ago

Oh that's VERY clever !! I like that !

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rickharris

2 years ago

Not really. The effect of charging them in parallel will be a) you will need a lot of current b) some batteries will charge at different rates resulting in over charging of some and undercharging others.

Buy 8 12 volt chargers.

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Charlie_Szaszrickharris

Answer 2 years ago

I should have mentioned that I plan on building a scooter. It might add a bit of weight to the scooter, but 8 small chargers for $72 seems close enough to my price range, but I'd rather just have a single charger.

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rickharrisCharlie_Szasz

Answer 2 years ago

Think really carefully if this is for a vehicle. Every pound you add will reduce you range and speed.

My electric car with 2 SLAs could reach 30 Mph and travel 50 - 80 miles. Adding weight significantly reduced both range and speed.

8 SLAs is a LOT of weight.

https://www.google.co.uk/#q=charging+multiple+SLA+...

The combined wisdom of Google on the issue.

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Downunder35mCharlie_Szasz

Answer 2 years ago

You can use a single charger if you don't plan to use the batteries for long.
After a few charging/discharging cycles you will already notice problems.
Not worth the hassle IMHO, better to isolate the batteries and use one charger per battery.

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-max-rickharris

Answer 2 years ago

When charging in parallel, I don't think different AH ratings would be a big deal, given that the cells will stay balanced, but different chemistries, different charge/discharge characteristics, and different voltages in parallel could ruin your day.

Of course make sure all batteries are topped off at exactly the same voltage before connecting them together, especially for larger, meaner batteries or anything lithium.

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Charlie_Szasz-max-

Answer 2 years ago

They're sealed batteries & all the same batteries of the same brand.