Snewo-
My first solar system was two panels at 100 W each used for my remote observatory. These days, you might get one panel of 200 W or so, use a Morningstar PWM solar controller to charge a deep-cycle, 12 V battery(ies). The battery(ies) would need to be stored outdoors or carefully and positively vented if stored indoors. I am currently using two AGM (absorbed glass mat) batteries, which are sealed, reducing the venting, but they are outdoors. Then you would need an inverter to plug your computer into. You would need to see what the power requirements are for whatever you want to operate, and use that to size the system. Overall efficiency would probably be 40% or so between the DC power rating of the panel and the power requirements of your equipment. You would need to be careful about isolating that electrical system from the other power in your house, or you might get some ground loops and other problems. You also need to ground your new system and avoid use in lightning storms.
You should be able to put together a system for under $1000. If you buy a very cheap inverter, it will not last long and can be very noisy. Batteries should be sized such that they are not discharged beyond 50% of total rated capacity. Northern Arizona Wind & Sun sells a 140 W kit for $479, http://www.solar-electric.com/rvkitwi140wa.html, but you would still need to add a battery and an inverter, which they also sell. |