The argument for smaller portable generators. The whole idea of using reserve power is to supplement the existing motor home battery life, as well as being economical in the running costs. ( and not disturbing your neighbors) As an example I would assume a 1000 watt roof mounted Air conditioner drawing 3amps would consume a 110amp wet cell battery in a matter of minutes. So if using 1000 watt generator ( giving 900 effective watts) , then it should hold the existing battery for at least 6 to 8 hours without going below the critical amp reserve. ( please correct my math here if I'm off on this calculation) No doubt a larger 2000 or 3000 watt generator would run the entire motor homes power needs, but at what costs? double fuel consumption as well as a much higher noise level, not to mention the increased weight and cost of a larger unit. There are obvious pros and cons to both size and capacity, but in and age of higher fuel costs and being "environmentally" minded ( neighbors) it seems to me that a smaller generator makes sense. Any thoughts?