My 50 watt solar panel keeps up with everything quite easily. Of course we have all LED lighting, but use it only sparingly. Most of our lighting comes from candle or oil lanterns. I carry a netbook computer, but charge it from the inverter when under way under power. We use a portable radio or the handheld VHF. The only significant draw is the refridgeration. We used it Monday/Tuesday and after the initial cool down when we motored out of the harbor it only ran for about 5 minutes every 90 minutes to two hours. We did have it set to 40 degrees though. The batterise were all fully charged when we got back to the dock courtesy of the solar panel and the 115 amp stock alternator on the engine