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SLA charger for 8-10 batteries at once

Thread starter #1
Hi
Im helping with some community events and setting up some uplights in trees, they are 12v rgb and im running them from 12v 12sla batteries.
There will be 8-10 batteries and to make life simple it would be good to plug all them in at once and then leave them for the week till the next markets week after.

IS there a way to do this other than spending $1000 on 10 separate chargers and using up power points all over the house :)

Cheers
Stu
 

Pommie

Well-Known Member
Most Helpful Member
#2
Just use one charger that can keep them all charged. I'm assuming all batteries are in parallel.

Mike.
 
Thread starter #3
Thanks for the reply.
The batts are all separate 1 for each light, then ill remove after the event and take them home, then leave on charge for the following week.
If i make a cable that plugs into them all then and turns into 1 parallel connection for the charger, would that work?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
#4
Thanks for the reply.
The batts are all separate 1 for each light, then ill remove after the event and take them home, then leave on charge for the following week.
If i make a cable that plugs into them all then and turns into 1 parallel connection for the charger, would that work?
Unfortunately not, as they will have differing degrees of charge, so will charge and discharge into each other until equalised.
 

MikeMl

Well-Known Member
Most Helpful Member
#5
Unfortunately not, as they will have differing degrees of charge, so will charge and discharge into each other until equalised.
Assuming that they are all the same nominal voltage, then SLAs can be paralleled for charging. Even if one is initially nearly fully charged, and another is mostly discharged. Yes, when first connected, you will be discharging one while charging the other. If you leave the charger connected for a day or two, then at the end of that period, both batteries (or more batteries) will have reached full charge.

The end-of-charge condition for SLAs is terminal voltage reaching ~14.4V and that the current has dropped to less than a few 10s of mA into each battery. The only time charging multiple SLAs in parallel wouldn't work is if one has a shorted-cell!
 
#6
Sorry, my link didn't work properly. Try this "ONE" For a multiple bay charger. May not fit your budget but worked well for us.
 
Last edited:

Pommie

Well-Known Member
Most Helpful Member
#7
I agree with paralleling the batteries. Once charged thay will act as one battery. Much simpler than multiple chargers.

Mike.
 

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