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An interesting point on using 24V panels - some individuals, usually with large RVs, have been using 24 volts for both their panels & batteries (4 6V or 2 12V in series). They use a 24V inverter, 24V compressor refrigerator, and a small DC to DC converter to provide 12V for the rest of the traditional RV appliances & lights.
The advantage is smaller wire sizes or less voltage drop. It also means you can use the less expensive PWM solar controller rather than the more expensive MPPT controller required when using 24V panels with a 12V battery. Not all PWM controllers can operate at 24V, but many can. Of course, with large systems of a couple thousand watts of solar, a MPPT controller provides other advantages, but by the time you have put that kind of money into a system, the price of the controller is not a big factor.
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