Sam Spoons wrote:A typical inverter will shut down when the battery voltage reaches 10V which is a safe level for the battery to help prevent damage. This will probably represent 50-60% total battery capacity.
Sam Spoons wrote:The inverter will cut of at 10V, as I understand it the deep cycle battery is designed to cope better with slow, deep, discharge. A starter battery is built to provide high currents for brief periods of time with immediate recharging
So are you saying a cold cranking batter would only have about 50%-60% of it total capacity when it has been drained down to 10V. And a deep cycle battery will have much more capacity then the cold cranking battery when drained to 10V?
No, not really 'cos I don't know, what I an saying is that lead acid batteries don't like being discharged below about 40% capacity and deep cycle batteries are better able to cope with frequent discharge to that capacity than starter batteries. A car battery, as Dave says, will be cheaper and will work fine, long term use it will probably fail sooner.
Folderol wrote:By that I meant you have a conversion from 12V DC to 240 AC, followed by the conversion back down from 240 AC to (probably) +-15V DC +5V DC
You can get converters that will go straight from the battery to those voltages.
True but you can't get at the +/- 15VDC and 5 VDC supplies in the XR12 without serious modification so the only practical method is to supply the XR with 230VAC.