I fitted a 160w solar panel to the roof of the Navara a few weeks back and hooked it up to 2x 125ah deep cell batteries via an MPPT controller as a "Stand Alone" power source for my 12v fridge/fridges and whatever else I want to run in the tray.
NO power whatsoever has been fed to the system from the engine via the Anderson plug I have connected to the dual batteries in the engine bay (Just in case) in this time and the 40l Primus fridge running at -2 (perfect beer temp) has ran flawlessly without making any significant dent in the SOC of the 2x stand alone batteries
I did connect another 80l Waco fridge for a week over Christmas to the system and this did increase the power usage overnight and the SOC went down to about 80% But it didn't take too long next day for the solar panel to get the batteries back up to 100% SOC.
I am very happy with this setup and it didn't cost me an arm and a leg to install it either
I also replaced the crappy little battery that came with the truck for a 720CCA one and installed a second battery tray on the passenger side with a matching 720CCA battery wired up in series.
The single 720CCA battery had No difficulty turning the piddly little 2.5l engine over But as I am going to fit a 12000lb winch a second 720CCA will be pretty handy to have was my thinking.
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