Quark 125b thermaling

[BrianG]

Yeah, I like their cases because they are easy to mount, but after looking at the thickness of the aluminum, it is really too thin and doesn't have enough thermal mass. Plus, the fins that do exist are really too small. According to their specs of being able to run up to 6s/18cells (~22v nominal) and 125A continuous, that is 2750 watts. At 90% controller efficiency, that's still 275 watts being dissipated on the controller, which is WAYY too much for that little heatsink. To be honest, the heat sink needed for that kind of dissipation would be quite large, even with fan cooling. Like I said, adding more thermal mass would be nice to pull the heat from the ESC, and then adding more/taller fins to dissipate the heat. Don't forget to use thermal compoung between the ESC heatsink and whatever you add for efficient thermal conductivity. I actually lightly sanded the back of the ESC to get rid of a lot of the texture and then used thermal epoxy (Arctic Silver) to secure the ESC to the added heatsink.