That's not bad going. When we wild camp for a night, we took 2, 5 litre water bottles with us. Did'nt use the waterpump, and manually tipped some water down the toilet. No problem with lighting although i only had one on, and others when needed. We watched the dvd player through the cab cigarette lighter socket.
Regarding genny's, i love them. Although i've never had one, but the cost now is

bongers. i still cant bring myself to oart with £500 approx for a solar system though. Not reliable enough IMO.