Battery Recharging - A Study - Fiberglass RV


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Old 05-05-2003, 04:47 PM   #1
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Battery Recharging - A Study

I wanted to play with some toys at home. I incurred a 13.6 amp-hour deficit on a fresh battery (About 24 hours of medium summertime loads). I have a Link 10 that tracks all this.

I recharged with my Honda 1000. I don't know how long it'll run on a light load. This whole excercise was run on Eco-Throttle, and the generator basically idled, except when I vacuumed the floor (2A, 120v Red Devil vac). Even then, it barely sped up. While running the vacuum, the charging current didn't drop. From 50 feet away I could barely hear the generator. (It wouldn't register above ambient sound on a sound meter.)

The object of recharging was to drive the 13.6 back down to zero (The Link 10 also monitors this). I quit after running the generator for 3.5 hours. After 2 hours, and every 1/2 hour after that, I recorded the amp-hours and the charging current going back into the battery and then plotted the results.

<img src=http://www.fiberglassrv.com/board/uploads/3eb6d7a381efcRecharge.jpg/>

The so-what of all this? After getting all but about 2 of the amp-hours back (2 hours) it was going to be long struggle to get to zero. I take away from this that running the generator for 2 hours would bring me 97 percent of the way back. Time to quit.

If I ran the generator every other day, I expect the time to almost double (to a 2 amp-hour deficit) since the charging current would (probably) ramp up also. There was still gas in the generator at 3.5 hours so I expect 4 hours to be reachable. With the Link 10, I'd just run it down to 2 amp-hours and shut the generator off.

Hoo boy! Get this boy a life!
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Old 05-05-2003, 04:58 PM   #2
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OK, Steve.

I understand all this except what software did you use to produce the graph? That knee at 2 hours is called the point of diminishing return, your Magnatek probably did that. It's not as smart as the Link-10.

You realize you could have done this with an ammeter? That graph wouldn't have been nearly so pretty.
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Old 05-06-2003, 06:46 AM   #3
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Morgan,

I just plotted the numbers (amp-hours and charging current vs. time I'd been charging) on EXCEL. Then I copied the chart to a picture editor and saved it as .jpg.

As you pointed out, but I probably didn't make clear, it's the Magnatek that altered the charging current. The Link 10 is just a meter that records what the Magnateck is doing.

I did record the amps and I could have evaluated the state of the battery charge based on it's acceptance of current, but the amp-hour feature is more intuitive for me. In other words, if I use 13.6 amp-hours, I have to put 13.6 amp-hours back in. The amp-hours fly out, but it takes much longer to return them. I wondered where the diminishing return point was, and now I know. At least for my battery and charger. Using an ammeter, I'd charge until the battery would only accept 3 amp.

I could also have judged battery state by voltage, but during recharging, the battery shows 13.4 vdc and even if I turned off the charger momentarily to get a voltage reading, it takes a bit for the battery to "settle".
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Old 05-06-2003, 07:54 AM   #4
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This is - - interesting. but I don't know what to do with this information. How does this help me become a better camper?

AND I didn't see anything about what color my battery should be either :crazy-ii. :duck
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Old 05-06-2003, 11:44 AM   #5
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Those who bring a generator to boondocking might find this info interesting. Oh well, let's file this in the "okra" type file folder as having limited interest. :laugh
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Old 05-06-2003, 01:56 PM   #6
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Steve LaBroad (no I need more syllables if I'm going to get this right) Ste-ven-La-Broad, (there that's better.) I did NOT mean this was not good and useful, I just wanted you to tell me how can I use this for me. Milly May Public. I could sit here and rechart and think about this and ponder, but I'd rather you tell me. :) I'm reinstalling windows in Buttercup at the moment, tornado warning out AGAIN. :wak
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Old 05-06-2003, 02:16 PM   #7
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Oooog! Flashback! "Stephen George LaBroad, you come here RIGHT NOW!" "Aw, Ma, I didn't do anything."
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Old 05-06-2003, 02:22 PM   #8
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Ha!!:laugh so it worked. :lol
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Old 05-06-2003, 02:34 PM   #9
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Managing 12 volts.

Steve,
You'd probably enjoy the book "Managing 12 volts"...lots of great info and charts!!


Bill
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Old 05-08-2003, 04:01 PM   #10
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Jana, Steve should have marked the thread with a "GEEK ALERT" for all the Millies out there :huh :) :o

Pete and Rats, grinning
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