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Old 07-14-2006
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Battery wiring question...

I have been told that 4 Lifeline GPL-4C batteries (6V-220 AMP) can be wired to provide 440 amps @24V. I'm having trouble figuring how this can be. Can anyone help?
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Nope. 12V @ 440A (two sets of 6V in series [12V] in parrellel). or the 4 you have in series (24V @ 220A).

What is the 220A rating? Is it 220AH (amp-hours)? If so, they must be big and heavy. I hope they are flooded (wet cell) and not VRLA ("maintenance free"). If you can add water, they're flooded.

If not, pay close attention to the charger you use. It MUST be temperature compensated!
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Old 07-14-2006
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George,

Realize that your batteries will lose aprox 10%-20% of their capacity in the first year, and on top of that your 440 amps (which I'm interpresting as AMP-hrs) only about half is actually usable. What you are saying can be done, just make sure in the end you will get what you need. A marine electrician may not be a bad person to callon for this. You will also want to make sure your alternator can handle the charge demand.

Regarding the above post, beware, temprature controlling chargers will usually monitor the first battery only, and if the second or third go out they will overcharge and boil your batteries. It happened to me, We woke up at 5 am with the nastiest smell inside as our batteries were boiling out their acid.
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Understood. (I'm a DC power engineer) BUT operating VRLA such as AGM or gel-cell batteries without one is asking for disaster. These batteries expolde if not charged properly and are hot. I have spent the last 20 years designing chargers for these batteries and will NOT have them on my boat.
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our battery bank

We carry a 24 volt 690 amp battery bank using 12 group 27 wet cells .
eric
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