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Old 02-26-2019, 10:09 AM   #1
Skoolie
 
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Help Sizing Charger

So i jumped the gun last fall and purchased 8 215 ah fla batteries for the bus, but just now getting around to buying something to charge them from shore.

Looking for advice on best charging them. Currently looking at a a Progressive Dynamics 24v 40amp charger. Is that enough?

I have some 12v dc stuff and some 110ac (fridge, tv) that i plan eventually to get an inverter for.

Also am thinking of a manual switch or plug to change from inverter to shore.

Thoughts?
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Old 02-26-2019, 10:10 AM   #2
Skoolie
 
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I do plan to add solar eventually which is why i am thinking a 24v bank might be best and downconvert for my 12v stuff
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Old 02-26-2019, 10:48 AM   #3
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Well.....

FLA like to be charged at C/8-C/12. A good rule of thumb is 10% of your batterys C20 rate.

What is the voltage of your batterys? You gave us. Amp-hour rating but not voltage.


Some good battery info:

https://www.solarpaneltalk.com/forum...your-batteries

https://www.solarpaneltalk.com/forum...tteries-part-2
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Old 02-26-2019, 10:57 AM   #4
Skoolie
 
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Sorry, they are 6v golf cart batteries
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Old 02-26-2019, 11:16 AM   #5
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So 8 6v 215ah batteries comes to a bank of
24v 430ah

10% of 430 is 43amps recommended, the charger i am looking at is 24v 40amp

is this close enough?
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Old 02-26-2019, 11:19 AM   #6
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Eight GC2's in series will yield a 48 volt / 215 amp-hour battery.

If you want to go 24volt, I would recommend four L-16 batteries in series. That will yield a 24 volt / 400 amp-hour battery.

A good starting point would be 10% of the C20 rate. The charger that you linked appears to be adequate.
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Old 02-26-2019, 11:32 AM   #7
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I already have the batteries, is it bad to go 24v series parallel then?
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Old 02-26-2019, 11:39 AM   #8
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I'm using the progressive dynamics 9245C to charge my 12v GC batteries. I managed to get 7 years out of my batteries before I began to notice any decline in their service. I've been careful not to let the batteries go low on water and not to over discharge them. Also, I installed the "pendant" which allows me to see what charge rate is being applied as well as to select a rate. There are several good charger/converters on the market so give them all a look.
Jack
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Old 02-26-2019, 12:20 PM   #9
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The default should be 12V unless you have compelling reasons to go any higher.

What you might save in thinner wire gets eaten up by higher costs in all the ancillary gear, especially load devices, high-current buck converters aren't cheap.

IMO
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Old 02-26-2019, 12:36 PM   #10
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Quote:
Originally Posted by MambaJack View Post
I already have the batteries, is it bad to go 24v series parallel then?
Not all batteries are exactly the same. Internal resistance can vary enough that some of the batteries in the parallel string will "do more of the work" than others. They can also charge at slightly different rates. This can lead to premature battery failure.

There is a lot of good solar, battery and charging info in the stickies on www.solarpaneltalk.com.

Learning from others mistakes costs a lot less than learning from your own
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