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If you're not planning on using the second battery on a daily basis it would be easy enough to simply add a 50-100 watt solar module and a charge controller to charge it back up. The problem with relying on the vehicle system is that you have to be running for a long enough period to get the...

How do plan to charge the batteries? Vehicle, generator, or solar?

Yes, the battery will need an extra 10% +/- to overcome losses in the charging process, and flat-mounted modules will likely only put out about 70% of their rated capacity under real world conditions. I like the big module and MPPT approach, but it's not possible on many campers due to roof...

There is no one set value for the amount of solar to be used because the positioning of the array and temperature affects the output. The biggest factor in charging is the Amp-Hour capacity of the battery and the relative amount of current that the charge controller can deliver. Most battery...

Crown or Trojan, unless you're going with AGM, in which case Concorde too.

It's simply a function of temperature. The 108 cell setup will exceed 75 volts if the modules get down to about freezing. If they stay above that, no problem.

I don't believe that it does. There are a few others, such as Midnite Solar, that have an overvoltage allowance, but they simply don't allow the unit to operate during the time when the voltage is above the maximum operating parameter.

A note on this: Don't connect three of the "12 volt" 36 cell modules in series and connect them to the Victron 75/15. The open circuit voltage on most modules is about 22.5V at 25degC, which puts you at 67.5V for the string. If the temperature drops below 0degC the voltage will exceed the 75V...

Truck Camper Magazine had an article on this a while ago. Apparently, if the truck has the snow plow prep package they automatically put the "no truck camper" sticker on it.

Your biggest issue, if you're planning on camping in the coastal areas of the PNW is the limited available solar resource. Consequently, you'd want to go with much more than 100 watts, if possible. If you are planning on mounting the modules to the camper, first determine what space you have...