Large solar panel for lighting system

摘要

The Solar Power Lighting System (Silicon Chip, May & June 2010) is a great project but what if I want to use a solar panel larger than 5W and a larger SLA battery? The reason I ask is that my site is alpine and winter is horrible for solar energy - shade and clouds. So I believe I would need, say, a 10-20W panel and larger SLA battery to get through "a bad week". (A. C, via email).