> Or follow suit with the car audio crowd and install more batteries... If you were to do that, to keep 35W at 12V alive for 7 days, you would need: 7 days / ( (50 A * 1 hr * 12V) / (35 W) ) = 10 batteries (google the LHS) You're likely only to find 50Ah batteries. Optima yellow-top deep-cycle ($200) is rated at 55Ah - YJMV (Your Jouleage May Vary). Each battery is at least 60 pounds also. What's the application? -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Dave Carlson <thecubic at thecubic.net>