Great working tank circuit with backup bat.
OK I tried this out and it works awsome, I put a relay on the accessory wire to cut the power from the battery to the inverter when the accessory wire is powered off and I put a second relay switched from the 12volt wire on the hard drive power plug to keep the back up bat from recieving power when the computer is not turned on. This should keep the Back up from not over charging since it only get charged while the computer is pulling volts. And if I forget to turn off the computer it will run off the backup until it is totally drained(which is ok since the backup is a NICd anyway). Should work with a rechargable lead acid battery as well. I found one a rat Shack for $28.00 today. 12v 5ah, great for this use.
Originally Posted by LESLIEx317537
Thanks again for the help. :D :D :D ;) :cool: