Thanks John,
will do the heat prevention exercise as its cheap and there is nothing to lose. (How many heat sinks are we talking about?)
What I am going to do on the power supply side is have a dc-dc converter fed off the batteries directly (obviously fuse protected) to have a decent amperage on the supply and also not have the dips if the inverter switches between utility and alternative supplies.
Solar assistant offers 1 month free trial, im going to give it a shot on a different SD card to see what the system has to offer.
I will report back on this discussion after the exercise.