(jealous T1, wish I could fit it on my bus roof 
)Tarbaby the MPPT regulators could do control switching but they are working on panels at 60 -odd volts, series wired. To SSR switch a 12v battery you would only want a few volts above maximum charge suiting that battery. Also my regs are cheapo Tracer units, no way to modify the algorithm.
Not saying it wouldn't work but .......
If/when we put on more panels they will all have to be re-wired to suit using SSR and Plasmatronics. OR control with a PLC / Arduino. Charging is not rocket science but its out of my pay/time capabilities.
Thermal stuff is a bit of a thing of mine, a barrow so to speak -we all need one
. I dont ever expect that fan to work as so much heat will dissapate long before the thermostat kicks in. Its the quietest Jaycar 40mm available but still makes a strange hollow sound when sucking through that tube. Nice to have something as last-resort backup though.All of my electronics are mounted with thought to thermal flow, the inverter and charger are both mounted VERTICALLY instead of the common flat-on-its-back-look. Its a little bit harder to achieve but proof is in the pudding, my el-cheapo 2500w PSW inverter fan comes on a lot less than it used to mounted this way. Check where your cooling fan is on any bit of electronic kit and mount said kit with fan UPPERMOST. Clean airflow MUST be available to the BOTTOM of the unit for cool air to access it. Natural convection will cool the electronics for a great deal of the work cycle and the fan should only activate during high loads.This theory also works well on fridges, leave the bottom open under the door, seal the sides and top at the front edge and vent at the upper rear. Check with incense smoke, amazing how much gets drawn though.
Using T1s mammoth example on page 2, when the SSRs blast that heatsink where does the heat go? Not straight into the poor Dingo?
To be frank I have played with water-cooled stuff a little as well, amazing how much heat a metre of 1/2" copper pipe full of water will pull away from the area. All depends on the layout of your rig of course, usually you gotta deal with what you got!
