So I'm just learning about this solar energy stuff. I have a small business and sell at shows, outdoor markets, trade shows, etc. Anyway, I have a little 200 watt power box to keep my equipment charged during these shows. I bought a 200 watt portable solar panel and hooked it up to my 200 watt power box. Well, I learned a valuable lesson that day, don't do that. It blew up my power box. I looked at the manual and it said it can take 30 watt max for charging. I bought a new box and this little solar panel. Things are back on easy street. I now read all the manuals when I upgrade.