When I first did my radio stand I used one of the computer back ups to power my radios. I have everything running on either 12 volts or 9 volts depending on the radios that are on. My main power for my set up is an old computer power supply. I also built a box to hold 4 of the 12 volt sealed batteries that come in the back up units. They are 7AH batteries wired in paralell. Some of the batteries have gone bad and need replaced. My power supply can be switched for 12 volt power when the computer back up shuts off. I am working on a float charging circuit to keep the bank of batteries charged. I have 2 12 volt 12AH batteries I may use in place of the 4 other batteries. I also have a 12 volt 26AH battery I thought about using on my back up that my 2 computers are running off of. You may want to think about a computer back up supply that could be powered by a higher capicaty 12 volt battery. I know the company I work for has a battery back up system for our computer system, but those units are large and take a fork lift to move. I know the only draw back on using a lead acid battery is keeping it inside a living enviroment and also charging it due to the gases produced while the battery is on charge. I hope this helps and maybe gives you some ideas on something to build or set up.
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