12-12.6 volts is essentially a "dead" battery. once you get down to 12.5 or 12.6 volts you should STOP using that battery.
also remember you are running the car on a single "starter battery" which was never designed for that kind of load.
this is why we would use TWO deep cycle batteries.
also some of our cars are very simple "electrically"
I would for example never suggest doing this to a much more complex car. my pop's 96 town car is VERY ECU centric and uses a lot of power. it would NOT be wise to attempt to go alternator less in such a car :-)
your camry may be the same way.
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