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October 29th, 2008, 12:29 PDT
I have four us2200xc6 volt batteries giving me 12 volts 450 amp hours
I'm trying to find the specs for all charge rates,max charge ,float,etc.
I have not been able to find it . Any help gets a big Thank You
October 29th, 2008, 12:52 PDT
Google can't find that string [ us2200xc6 ]
So you should have a mgf name & model # on the batteries.
Rule of thumb, normal charge rate, about 10 % of rated AH, so 45A charger would likely be safe.
Our Host, wind-sun has a battery page http://store.solar-electric.com/batteries.html
and a deep cycle battery FAQ http://www.windsun.com/Batteries/Battery_FAQ.htm that has some of the info in it, but really, the battery Mfg has the last say on the specs you seek.
The first thing , is what style of battery are they, Flooded (with fill caps on top) AGM, Gel, or what ?? They battery type does influence the voltages at different charging stages, if a sealed AGM battery was to be charged like a flooded cell, it would be destroyed in a few weeks.
October 29th, 2008, 13:07 PDT
it would appear they have a high absorb voltage by the pdf here from the manufacturer. each 6v battery fully charged = 7.75v or more and for 2 in series or 12v systems it's 15.5v or more.
they don't specify a float voltage and that you can email them for, but i'd suspect around 6.75-6.9v. multiply by 2 for 12v.
btw the ah 20hr capacity is 232ah for your battery so in parallel this creates 464ah.
October 29th, 2008, 13:10 PDT
From the US Battery Website:(typed manually from img file) (http://www.usbattery.com/usb_faqs.html)
C/10 charge current (20 Hour rate AH Capacity)
Charge until 2.583 per cell (7.75@6v, 15.50@12v)
Hold voltage for 2 to 4 hours then stop charging.
Charge time = 10 hours
Reduce charge voltage by 0.028 volts per cell for every 10F above 80F, increase voltage by same amount for every 10F below 80F.
Float: 2.17 volts per cell (with above temp adjustments--13.02 volts for floating a "12 volt" battery bank)
Link to home page (http://www.usbattery.com/usb_index.html) and to their download PDF page (http://www.usbattery.com/usb_pdfs.html) for other product information (including cycle life vs discharge chart).
Their sizing recommends multiply AH requirement by 2.4x... 2x (50% max discharge), +20% (for aging). Don't discharge below 1.200 specific gravity.
Typed in the information to make it easier to fine in Wind-Sun forum when searched.
October 29th, 2008, 13:19 PDT
Neil your correct on the amp hours I just like the number 450 I guess.
October 29th, 2008, 13:32 PDT
you're welcome and you might want to double check with the manufacturer on these voltages as it goes from very high absorb to a bit low on float imho.
i missed that float voltage spec and that in general seems low to me. most controllers may have difficulty going that much of a spread between absorb and float as many are limited to up to 2v like blue sky or the xantrex c series that don't have the ability to go over 15v on absorb, but can float at 13v.
October 29th, 2008, 14:39 PDT
Yea--every vendor seems to have its own spin on charging/maintenance...
Sounds like US Battery likes to charge "hard" (pretty much an equalization/stirring charge every cycle) and then float at just above the "full charge" level of the battery... Will use a bit of water when charging--but probably hardly anything when floating/storage... When the battery is "put back into service" after a winter's float--probably would not hurt to run a charge cycle through it first.
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