Help on battery choice

[palmsandpines]

Well a neighbor (electrician) and I worked this out, but maybe very wrong from what you are saying. I have a Grape 400 Watt system (very small). I'm looking to supply a Dometic CFX-35US fridge. My thoughts were to operate my system on 24v to decrease the size of the wiring needs, so that is why I said in series. So for someone with little knowledge, how best to proceed on answering the questions, calculations and homework? There must be already built schematics for this simple system as there has to be hundreds or thousands out there.

[Sunking]

You have a whole lot of homework to do because you really have no idea what you are doing or know anything about batteries. Two 12-volt 150 AH batteries wired in series is 24 volts, but is only 150 AH. I have no clue how you came up with 400 AH. Secondly if you really need 24 volts @ 400 AH you would not use 12-volt batteries. Well you could like most people do trapped inside a 12 volt box.

My gut says you really do not know what you want or need. So you had best do a lot of homework, or else you will loose a lot of money. If you do your homework and find out what it really takes, you will likely decide it is not a very good idea. 99% of folks who come here grossly underestimate what it really takes. Many by a factor of 10 meaning they spent $1000 and find out it takes $10,000 and discover they lost $1000. FWIW a 24 volt 400 AH battery is going to cost over $1000. Example 4 of these batteries will cost $1344 plus shipping charges on 600 pounds of toxic material. Keep in mind you will need to replace then in 2 years or less. Once you learn how to care for them your second set might last up to 5 years.

Does that get your attention?

[palmsandpines]

It looks like I will need two 12v 150 amp batteries that I will wire in series for a small 400 amp system. I would like to know a few options (brands) that would meet these requirements. Thanks for your thoughts!