question about charger amps into 6v t-105's

carl2591

SO not a cart guy but have changed over my 12v RV/Marine batteries on Airstream with 2 6v t-105 trojans. I also changed out the convertor/charger that was supplied with the trailer, a single stage rated at 55 amps, with a 3 stage powermax 100 amp monster..

I was thinking more is not less its more, but in the new convertor but that might not be true.

I have also change out all of the 1.5 amp DC fluorescent light ( with .5 amp LEDs, several bulb type closet light, everything that is, is LED. so my overall load with almost everything on TV, 2 fantastic fans, all lights, power for refrigerator on LP, and water pump when it run is like 9 amps.

My question is a 100 amp charger TOO large for 1. charging batteries and supplying power when hooked up to shore power. (will be installing solar panels in future and be more off grid as well..) and providing power to the lights etc.

When i plug in charger to recharge batteries after a couple of break in cycles taking the batteries to 12.3 volts it packs some 70 amps in which might be to much according to trojan who recommend some 25-30 amps for the t-105 batteries.

thank for comments and buggy on dudes, dudettes.

BGW

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theboss20

A battery will only accept what it needs and the built-in resistance of a battery also limits the current flow. The six volt conversion for RV’s has been used for many years with great success and many manufacturers are installing them on new RV’s. The converters push the charge rate but many also have a trickle charge circuit with some being an add-on depending on the brand. Hope this helps. 😎

carl2591

OK i hear that,, so why are most GC chargers in the 18-20 amp range from what I have seen?? and that is charging 6-8 batteries..

That is what has me confused on this whole amps size of the charger equation.

WalterM6

Nevermind, I misread and thought this was a question about golf cart batteries.

carl2591

I think they are more considered RV-Marine batteries, on trojans website they list them as golf cart batteries, but you catch the drift, its a 6 volt 220 Ah deep cycle battery. Trying to figure out good charging practices which according to trojan is

"When selecting a charger, the charge rate should be between 10% and 13% of the battery’s 20-hour AH capacity. For example, a battery with a 20-hour capacity rating of 225 AH will use a charger rated between approximately 23 and 30 amps (for multiple battery charging use the AH rating of the entire bank)."


On rv's the convertor also supplies power to light, fans, etc when hooked to shore power along with battery charging duties. The original unit was 55 amps which was powering a bunch of fluorescent lights(which have been upgraded to LED's) along with fans etc.

I am guessing 100 amps 3 stage might be too much and something more in the 45 amp range may be more correct so as not to over or charge too quickly the batteries.

just looking for guidance here from folk like you that use deep cycle batteries more than I.

NoleFan4Ever

A single battery at that size should not be receiving 70 amps unless it is just a boost to start it (ie Crank)

Marine and RV batteries usually have a charge being fed back to them from the charging system of the unit that are attached to. Like my Coach has 4x6v batteries making up the 12v system supply for the lighting, etc. Then there are 2 - 12v batteries for the engine. The charging system of the engine feeds power back to my coach and chassis batteries while riding down the road.

Golf Cart batteries have really specialized chargers today, ie: DPI Accusense, that have specifically programmed algorithms for certain manufacturers so they give the best staged charging available for the best pack health and to ensure both reliability and durability. They do not have a charging source being supplied while in use as do RV's and most boats.

carl2591

it two batteries to provide 12 volts adn this is a trailer not a MH. The charge is through the 7 pin plug when hooked to truck, but that is like 12.7 volts with like 2 amps or so not a lot of charge power. The onboard charger work when hooked to shore power for all 12 volts including battery charging..

I agree 70 amps is too much as trojan recommend only about 25 amps for 220 Ah battery. (now they are saying battery not batteries but I don't thing 50 amps would be acceptable either.)

I see chargers at golf cart barns that have scales that only go up to 18 amps and that is for 8- 6v volt battery cars..

NoleFan4Ever

See above...

WalterM6

Here's a thought that occured to me. During my research into lithium batteries they mentioned charging batteries at 100amp. Maybe this new charger is for use with lithium batteries. I've also seen quick chargers for electric cars that are 220v w/ high amperage.
Like I said just a thought maybe something you can look into.