Hi All, Previously we wrote regarding poor solar/battery performance in our Dec 07 TE. It turns out that we had a fuse issue with the double bank of solar panels, that meant we were only charging off the single panel. All fixed now. We have decided to add the fourth Kyocera 130 watt panel, to give us that extra supply for the engel etc.. A few questons, if anyone has some advice on: - Do we need the fourth battery, any advantages by having it? - Are there any problems with four batteries in line? - Do we need to upgrade the controller to a PL6 (have received contradictory opinions). Any advice would be most appreciated. Jill and I are due to leave Perth late in June for Darwin and back. Hope to catch up with other Kedronners on the road. Ian & Jill, 18'6" TE