Posted by jdemaris on April 24, 2010 at 06:13:57 from (67.142.130.48):
In Reply to: Battery Desulfator posted by John T on April 24, 2010 at 04:43:45:
T-105 needs a higher charge voltage to desulfate than a car battery. Cheap shop-type chargers won't do the job because the T-105 needs to be charged at 15.5 volts every month or so. This can be consusing since most battery chargers for sale say something like "good for all batteries" which is nonsense. T-105s used in RVs and motorhomes just about never get fully recharged and suffer from sulfation. That is, unless you park and let a solar-panel and controller charge them up once in awhile.
And, even the correct charger has to be sized to the job. If charging a bank, it must delivery sufficient amps to reach that 15.5 desulfation-rate. So, cheapest way is a small proper charger and doing one battery at a time. Iota makes one of the lower-cost chargers that is suited for T-105s. They come in 12, 24, and 48 volt models.
Since you're in Florida and golf-cart country, maybe some used chargers for sale?
The T-105s are the most widely used battery in solar-electric homes. The reason is, they are the most cost effective, and give much more battery for the dollar, as compared to AGMs. Also very forgiving when it comes to improper charging.
Subsequently, there's been a lot of testing and experimentation with charging T-105s, and longevity.
In a nut-shell, sulfating is diminished by over-volting. That is a function not on found with cheaper shop-type battery chargers. It done in the "equalization" mode found on chargers special made for quasi-deep-cycle batteries e.g. the T-105s, Deka GC-2, or NAPA 8144.
Hard to acccomplish with a cheap battery charger. Hard to achieve also when installed as extra "RV" batterie in autos and trucks. That because the standard reg. in a alternator will not totally charge a T-105. Usually only up to 85%. Some boats and RV motorhomes use "battery to battery" chargers to properly charge deep-cycle batteries. They take the 13.8 volts from the alternator and step it up to 15.5 volts when needed - just for the RV batteries.
The better chargers use battery-temp sensors to compensate for air temps and rates.
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