Need New Camper Batteries....

bob213 wrote:
If you have a U.S.Battery distributor near you these would be a good choice. You might even be able to get by with one battery if you are not boon docking alot and use your generator.
US Battery

If your normally plugged in I also would do 1 deep cycle battery.

If you have a Walmart close, buy the trolling motor batteries they sell. It is a hybrid battery but if you're almost always plugged in, it doesn't matter.

cm11599ps wrote:

rjxj wrote:
For $170 you can get 220 amp hours of 6 volt deep cycle at sams or costco. It's a step above a group battery because it's a actual deep cycle. The only draw back is that they are taller than gp batteries. No matter if 12 volt or 6 volt, when using a generator it's beneficial to be sure your charging system is working well. A converter upgrade is about $125.00 and can take your charge voltage from 13.6 to 14.4 or more. Often times converters that put out 13.6 will only have 13.5 or 13.4 hitting the battery which is slightly over float voltage of 13.2.

Part of the issue can be resistance in the wire from the converter to the battery. Resistance is determined by wire size, distance and temperature, with temperature not being a concern for those of us who are not working in a laboratory with super conductors.

How do you even measure that?

Measure the voltage at the converter terminals at the power center then measure the voltage at the batteries. The difference equals the voltage drop in the circuit. The circuit includes the wire and all connections. It brings up another issue which seems to be common. Check the set screw type terminals where the converter wires connect. Loose connections cause resistance too.

To go farther with the explanation we could also say that the resistance or even lower converter voltages dont matter to some people. They dont matter to the person who uses the rig and then returns home or hits a campground and plugs in. It will just take longer for the battery to reach full charge. Think of the resistance as a little heater or parasite. It can consume (waste) some of the converters power and still end up filling the battery but it just takes longer. It's like putting a hose in a bucket yet the hose has a small leak in it and not all of the water is reaching the bucket. The bucket will still fill but it takes longer. It doesn't matter when you plug it in and walk away but it matters when you are running a generator. It matters even more when you have limited gen hours or a noisy generator. You also pay a penalty for using energy. If you take X amount out of your battery you need to create X plus maybe 10 % or so more. Iirc my solar controller is set the return about 112 %.

It may not matter a lot for your style and none of this stuff is one size fits all and it can all be accomplished in different ways. You can be a boondocker and be very frugal with energy or you can be a boondocker and have everything in the rig turned on. You just need to be efficient at replacing it.

If you have a U.S.Battery distributor near you these would be a good choice. You might even be able to get by with one battery if you are not boon docking alot and use your generator.
US Battery

rjxj wrote:
For $170 you can get 220 amp hours of 6 volt deep cycle at sams or costco. It's a step above a group battery because it's a actual deep cycle. The only draw back is that they are taller than gp batteries. No matter if 12 volt or 6 volt, when using a generator it's beneficial to be sure your charging system is working well. A converter upgrade is about $125.00 and can take your charge voltage from 13.6 to 14.4 or more. Often times converters that put out 13.6 will only have 13.5 or 13.4 hitting the battery which is slightly over float voltage of 13.2.

Part of the issue can be resistance in the wire from the converter to the battery. Resistance is determined by wire size, distance and temperature, with temperature not being a concern for those of us who are not working in a laboratory with super conductors.

How do you even measure that?

For $170 you can get 220 amp hours of 6 volt deep cycle at sams or costco. It's a step above a group battery because it's a actual deep cycle. The only draw back is that they are taller than gp batteries. No matter if 12 volt or 6 volt, when using a generator it's beneficial to be sure your charging system is working well. A converter upgrade is about $125.00 and can take your charge voltage from 13.6 to 14.4 or more. Often times converters that put out 13.6 will only have 13.5 or 13.4 hitting the battery which is slightly over float voltage of 13.2.

Part of the issue can be resistance in the wire from the converter to the battery. Resistance is determined by wire size, distance and temperature, with temperature not being a concern for those of us who are not working in a laboratory with super conductors.

Whatever the largest marine/RV 12v batteries that will fit since you don't want 6v.
I wouldn't use vehicle starting batteries. They aren't designed for that service. I really don't agree with knowingly using a starting battery for a deep cycle type of application and then taking advantage of the warranty when it fails.

Costco has a good price on group 24 or 27 that should serve you well.
As long as you are charging with a generator it might also be a good thing to review your converter is charging properly with 14.2+ volts.

I like to go to Costco and get the ones that will fit, and have the longest warranty. Yes, they are vehicle batteries. The need for deep discharge batteries is not called for, you don't need anything special.