Does any one know any websites that sell Ah batteries. it will eventually be 12V @ 145 Ah but what I will do will rig several batteries to get that output. so does any one have any suggestions?

 

You would likely be better off looking for a battery vendor close to where you live.

You might find cheap prices online, but shipping will be expensive, as batteries are heavy for their size.

 

Unless your location is especially remote, you should be able to locally purchase a deep-cycle battery which meets or exceeds your needs. Some of them are rated for over 200Ah.

 

It needs to be a rechargeable and I have size limits as well.

 

Deep cycle batteries are indeed rechargeable.

Deep cycle batteries are the same size as other lead-acid batteries. What are your size limits?

 

Currently, the highest capacity "consumer deep cycle" batteries are the Optima Yellow Top and Blue top series. 13.8V and 55AH for yellow top ($180 US), 13.8V and 65AH for blue top ($220 US).

The "reserve capacity" is part of the Amp Hour rating. It is difficult to get the real specs on batteries other than Cold Cranking Amps, Charging time, and "Reserve Capacity". Reserve capacity is how many minues it takes a 20 Amp draw to pull the battery terminals to 10.8V, so Am hours can sometimes be estimated from the reserve capacity, but not very accurately.

If you rquire 145AH, the battery requirement will change drastically if it is a 2 Amp draw for 70 hours, vs. a 100 Amp Draw for an hour and a half.

Deep Cycle Bateries are rated at a discharge of C/20, so a 60AH battery will be dead in 30 hours with a 3 Amp continual load. If drawing higher current, the capacity drops quickly. For those purposes, something along the lines of an electric forklift battery is needed.

 

Here's a helpful battery FAQ:
http://www.windsun.com/Batteries/Battery_FAQ.htm
Read through it.