New to RVing. I have purchased a AGM battery to replace the old one. I have read all over the Internet that the RV charger controller may compromise the new battery.1-Is this true only when connected to 110 V or also while driving and the battery is receiving 12 v from the truck alternator..2- For AGM batteries they recommend to charge it after reaching under %50. Do you have a solution?

Some/many newer chargers have an AGM setting, check yours. AGMs are very similar to flooded batteries and as such should be recharged ASAP. And as a general guideline do not discharged below 50%.Most tow vehicles do a limited charge of trailer batteries. Yours may/may not completely charge the trailer battery with a day's driving. There are solutions like upgraded wiring and/or installing a DC to DC charger in the trailer.

No, having multiple charging sources all charging at the same time will not hurt at all. The lesser voltage charge will not even matter, it is only the highest voltage charger that is charging assuming the battery is not near depleted. IF depleted then the others might contribute, but that is info that is really of no use to discuss.You are in TC forum so possibly your batts are closer to the alternator than would be in a trailer, but unlikely as I always see the wires connect from the back of the truck, then run in the bed to the front of the TC then out to battery. If you want more from your alternator then shorten that distance, cut out the going to the rear of the truck, and just wire up through the front of the bed and somehow run the wire as direct to the battery as you can.Anderson plugs are good for making the connection.Otherwise the slow charge from the way it is will be fine.You can run solar, be plugged in with your charger going and run the truck motor/alternator and this is fine for the battery.The best charging is an AGM specific "smart" charger though.

Alternator will not hurt the AGM. If anything it will probably under charge. Still good to get any charge into the battery.You will need to post the converter model for best answers for charging on utility/generator power. Some are excellent, some are miserable.

You want a 4 stage converter, like the PD charge wizard set up. Depends on what you have now though, may be good to go already. The charge wizard thing is nice because you can manually put it into boost mode, thats helpful when your on a generator especially. AGM's love a full charge, but they do charge quicker than regular flooded batteries they say.

Battery charging concerns. | Good Sam Community

ajriding
Explorer II
May 17, 2021
No, having multiple charging sources all charging at the same time will not hurt at all. The lesser voltage charge will not even matter, it is only the highest voltage charger that is charging assuming the battery is not near depleted. IF depleted then the others might contribute, but that is info that is really of no use to discuss.

You are in TC forum so possibly your batts are closer to the alternator than would be in a trailer, but unlikely as I always see the wires connect from the back of the truck, then run in the bed to the front of the TC then out to battery. If you want more from your alternator then shorten that distance, cut out the going to the rear of the truck, and just wire up through the front of the bed and somehow run the wire as direct to the battery as you can.

Anderson plugs are good for making the connection.

Otherwise the slow charge from the way it is will be fine.

You can run solar, be plugged in with your charger going and run the truck motor/alternator and this is fine for the battery.

The best charging is an AGM specific "smart" charger though.
CA_Traveler
Explorer III
May 17, 2021
Some/many newer chargers have an AGM setting, check yours. AGMs are very similar to flooded batteries and as such should be recharged ASAP. And as a general guideline do not discharged below 50%.

Most tow vehicles do a limited charge of trailer batteries. Yours may/may not completely charge the trailer battery with a day's driving. There are solutions like upgraded wiring and/or installing a DC to DC charger in the trailer.

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Battery charging concerns.

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