Hello from Solly's Farm north of Collingwood.
The original setup in our motorhome, new Oct 2007, was 2 x 115 wet batteries ( a real pain, checking and topping up water on a regular basis) 1 x 125 watt solar panel and a Morningstar Prostar 15 amp solar controller and a 2kva Honda generator. For full time living especially in winter our Honda generator was used probably 5 days out of 7 if bad weather days for several hours when not travelling.
We free camp most of the time. By August 2009 we had had enough of conserving power, always looking at the dials checking we were not running things too low. We went ahead and did the big upgrade to a 20 amp IVT ( German) mppt solar controller connected to 4 x 120 watt panels and 2 x 260 AGM sealed batteries, all new August 2009.. We had no issues at all with that set up, ample power for full time living in a 7.3 cabover motorhome with a washing machine, 2 laptops, tv, diesel heater etc. We also had a second Even charger added to charge the bigger batteries when travelling.
After a few months and further online research we realised that the 20 AMP mppt was too small for continued use in conjunction with the 4 x 120 watt panels. In January we changed the 20amp IVT solar controller to a much larger 45 amp Morningstar MPPT. It was suggested that we also install a digital monitor that reads everything except the colour of your knickers! To do this we would have had to run a further wire down to the batteries from the controller area. This was just too hard to do as a retrofit, so that idea went in the too hard basket. The new system ticks along just fine, our batteries are fully recharged each day usually by early afternoon. To look at the dials and see 15 - 20+ amps going in on the dullest of days with no visible sunshine is a comforting sight and then when everything is full and no more solar going in it all shuts down after the pulsing stage has finished, if we are not using any power. It just keeps ticking over day after day. We never even consider having to go near 240v power for a day to "top up" and have even left our 2kv Honda generator back in Auckland in storage. Not quite game enough to sell it yet, we will see what happens this winter, but we are fairly confident we can survive very comfortably without it.
We are very happy campers with this setup for full time free camping lifestyle.