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Old 12-15-2019, 11:56 AM   #1
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Battery Charger question

I'm going to buy two Duracell 6v GC2 batteries and hook them up in series for 12v. They are rated at 215 Ah each. (So a total rating of 215 Ah with both in series)

Would this battery charger be able to fully charge them (when hooked up to the series connection as one 12v battery)?

https://www.amazon.com/Automotive-Ba...W1PRB8FRV3A6H7

I don't want to buy this if it's not going to work for this setup.

Thanks!
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Old 12-15-2019, 12:15 PM   #2
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I believe those are lead acid batteries.
Looks like a good choice. Sweet spot for a charger is, for a number of reasons, approximately 10 amps. A couple of references for you;

https://batteryuniversity.com/learn/...d_acid_battery
http://batteriesbyfisher.com/determining-charge-time
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Old 12-15-2019, 12:36 PM   #3
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I guess what I'm concerned about is that the batteries that I'm going to buy are 215 Ah. Should this not be an issue? I'm guessing at an 8 amp charge it would take a long time to charge. No big deal. But it would be able to fully charge those 215 Ah batteries, right?
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Old 12-15-2019, 12:54 PM   #4
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Take a look at the second reference that I gave. . A couple of obvious facts. How discharged your batteries are, temperature while charging and as you suggest capacity. Look part way down the article until you find a table with battery pictures to get some idea. Yes you will be alright. You will likely be ( at least want to be) no more than 50% dead when you charge up again.
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Old 12-15-2019, 12:57 PM   #5
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For most deep cycle batteries you want a charger that outputs 13% to 15% of the AH capacity.

About a 25 amp, 3 stage, automatic charger will be your best choice for good charging. That gets the acid moving to prevent stratification.

https://www.solar-electric.com/learn...ery%20Charging

Battery Charging Voltages and Currents:

Most flooded batteries should be charged at no more than the "C/8" rate for any sustained period. While some battery manufacturers state a higher maximum charge rate, such as C/3, higher charge rates can result in high battery temperatures and/or excessive bubbling and loss of liquid. ("C/8" is the battery capacity at the 20-hour rate divided by 8. For a 220 AH battery, this would equal 26 Amps.)*
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Old 12-15-2019, 01:04 PM   #6
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The charger the OP is looking at is a three stage one. At 8amps it should be ok. Keep battery charging temperature reasonable, not too much gas or loss of water charging times not too long ...
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Old 12-15-2019, 01:36 PM   #7
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Quote:
Originally Posted by phfkef View Post
The charger the OP is looking at is a three stage one. At 8amps it should be ok. Keep battery charging temperature reasonable, not too much gas or loss of water charging times not too long ...
It says it protects against over heating.

I feel good about this charger. Just wanted to be sure it's up to the task.

Honestly, I hope to never have to use it. But I wanted a new one since my old one is really outdated.

Thanks guys for the input!
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