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Old 11-11-2004, 07:30 PM   #21
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I want enough information to understand the charging rates of different modes of charging and the time it takes to charge different levels of discharge. And in understandable english. Is this too much to ask?

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Old 11-11-2004, 07:56 PM   #22
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Neil,

To your first question: you should limit the bulk charge phase to about 25% of the battery capacity. Some sources say 20%. So 50 amps is way too high. It will cause the batteries to overheat and start throwing off hydrogen and oxygen.

Second, once the batteries reach about 80% of full charge, you should switch to a voltage limited absorption phase. As the voltage of the battery and the voltage of the charger approach each other, the amps taper off. Kind of like Terry's two milk jugs, connected by a tube. As the level in the two jugs get closer together, the flow rate through the tube will slow down. Likewise, as the voltages get closer together, the flow of electricity will slow down.

Regarding the math problems. Because of thermal losses, you need to put about 20% more energy into a battery than you take out. So if you take out 50 ah, you need to put back in about 62 ah.

Battery charging is a non-linear function. It can get very complicated if you start to look at different temperatures and rates of charging and discharging. Then there's the 'Peukert' factor, which says the faster you drain a battery, the less total energy you get out.

A battery is a storage device, but it isn't just a bucket that you can put in and take out at a fixed rate. Going back to the milk bottle analogy, think of the battery as a bucket that you are trying to fill to the very top. You can fill it very quickly when it is near empty, but as you get toward the top you need to slow down or it will splash out over the top.
Here's a website I found useful: http://www.pacificpowerbatteries.com...AQ/dcfaq6.html
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Old 11-14-2004, 01:54 PM   #23
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Tomorrow I'm taking the trailer in for solar installation. But in the spring I may want to buy a Honda 2000 generator as backup for bad weather days. Rather than charge the battery from the generator to the batteries via the converter at 8a, I'm considering buying a 15a charger to connect from the generator directly to the battery posts.

With my 2 Group 24 Interstate deep cycle batteries, the major red wire connects to the plus post of one battery and the major black wire connects to the minus of the second battery. The two batteries are connected with a smaller wire, plus to plus and minus to minus.

With a battery charger in place, would the allegator clamps be connected to the major red and major minus posts (of different batteries) or connected to the plus and minus posts of only one of the batteries?

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Old 11-14-2004, 07:24 PM   #24
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I would connect to the major posts. The only reason is to put the juice back in the same way it came out. Really doesn't matter.
You want to make sure the batteries are the same size, brand and type-if one goes bad you should replace them both at the same time.
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