I am with Mark.
any loading electric cost is put back in batteries by truck charging system.
I guess if you unload at a boondock site it would cost electric.
also since I already decided on the Bogart I used there controller for the solar system. it integrates with the TriMetric and allow precise control of voltages while charging from solar. Plus you can go into the unit to program what type of batteries you have so it knows how to charge. I wish the TriMetric could control the voltage of the onboard charge system, but I only use that while campground camping. sitting at home my 200w solar system keeps the two 90ah AGM's fully charged without plugging it in.
as far as charging time (per AH) this changes with sun angles, cloud covers, etc.
