Solar controller

I have only ever used pwm controller on five vans now.
Several reasons 
Easy to get dual battery ones, which I always want.
Cheaper 
Reliable with one exception, not still sure that was the controller fault.

Now before everyone starts on about getting a better output from the panels with mppt, this is true. However as my batteries are invariably fully charged by, say, noon,the panel then spends the rest of the daylight doing nothing unless we're using power. Had it been mppt, the batteries would be full say, 11am then the panel spend rest of day doing nothing!

I rely on simplicity and avoiding any Sargent connection at all!

I had an Eddi Solar Diverter fitted in the new solar installation in our house. This takes excess power from the panels (once the house battery is charged) and sends it to the hot water immersion heater. I guess you could in theory do the same with a Truma and use any excess for hot water and heating  In our house installation we used no gas to heat hot water during the summer and through until late October.

As an add-on to our solar installation this unit (which handles 10kw of solar panels) cost about £500.00. It may be that there is an inexpensive low output diverter on the market but I have not looked. I guess it would need to run through an inverter though.