This question could probably be generalized enough to fit into the Community section, but since I'm asking it specifically for my Macbook Pro, I just figured here's as good place a place as any. Nutshell: Do Apple's laptops/chargers require constant wattage to charge? If the wattage fluctuates, is any damage done to the battery/charging system, or does the battery just charge at a different pace? I'm a huge gadget guy, and pretty big on renewable energy as well. I recently picked up a Solio Classic solar charger that I use for my iPods, iPhone, and Nook eReader. I'm completely hooked. I'd like to go one step further and find a way to charge my laptop, and I know many solutions include: Solar Panel <-> Charge Controller <-> 12V Deep Cycle Battery <-> Inverter This allows you to charge during the day, then use the energy at night. (Or whenever.) It also provides constant power. (Both in terms of availability and wattage.) Since that can get a bit more expensive, I'm looking to simplify things: Solar Panel <-> Inverter So my questions are: Will this work at all? Can I just plug in a Macbook Pro charger to the inverter, and get a trickle charge while there's sunlight? (Obviously charging would cease when there's no sun.) Do I need a 85W panel for a 85W charger? If I use the 20W panel, will it charge at 1/4 the speed? Or just not at all? (Given full sun.) I work during the day on a separate machine, so I don't use my laptop for the 8-9 sunniest hours of the day. Here's to experimenting!