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Xantrex C12 Charge Controller, 12A, 12V

Diary 3-20-07

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Latest Diary entry:

3-20-07

I started to do the first episode of "This Old Shack" but after stammering into the camera for a half hour I decided to wait for a more opportune time. 

If you remember from my last entry, I've labeled all the batteries and split them into two planned banks, Large and Small. The large one for inverter use, the small one for 12 volt power use.

From testing here at the house (our southern hacienda) I've discovered that I can get up to 12-16 hours from each small battery running a typical 12 volt load, or around 30 hours when running as a bank

After the first two tests where I place a constant 6 amp load on each battery individually, I discovered that the charge time for each one (S1, S2, S3) varied. By a lot. How I did this was by charging each unit from a 70% charge to full charge (according to the Schumacher Smartcharger) at a 2 amp rate (Note: yes, this isn't a real world example. While at the cabin, I charge at 30 amps

 in order to bring the batteries up to full charge with as little stress as possible. What I noticed is that battery S2 got to 90% and stayed there. A loooong time. At a charge rate of 8 amps, it came right up to a normal charge. What I've done is equalize the battery with my manual charger and will test it again tonight. The other two small bank batteries are performing nominally (note to self: gotta start using more NASA like terms - call it NITWIT: Nasa Infusion of Terms With Interesting Testing) and don't look like they're a problem, even the one that did in fact give me problems when it was new.