Hi Richard, thanks so much for joining in!
i have been testing the fridge wired directly to battery
(via fuse). all house electrics are off at initial breakers, only other battery activity is solar
charge controller and VSR linking engine
battery (active due to increased voltage from solar
charge controller). Apart from killing all other battery outputs this is exactly how it was when first installed and through the week of happy operation.
voltage measured at fridge with fan and internal light running is currently 13.48 (panels live)
after initial week's perfect operation in sub-optimal installation
(not built in, and with space for a little passive cooling
but no fan) the unit failed, possible following turning thermostat to full (to try and make ice) or possibly after running the engine
for the first time (both of these were in fairly quick succession)... obviously i don't know exact moment of failure as wasn't keeping a constant eye.
in case it's of any relevance the original installation
was with pretty thin wire - i bought the unit second hand with no instructions and foolishly used the wire already attached. since having issues i've been reading and have replaced with 6mm (when was on a 4m run from battery) and now testing with 2.5mm around 1m from battery.