I think the Victron products are a good choice, I am very satisified after having used them in an off grid solar installation at a cabin.
Good quality and small in size, not to expensive for what you get either.
For my camper box I am installing the Mppt 100/30 solar charger together with their VE direct Bluetooth dongle for monitoring via smartphone APP.
For the panels on the truck roof box, charging the truck batteries, I use a an mppt 75/10 with the same dongle.
By turning of heating system you mean thermostatic control, or just manual on/off?