How many car batteries would it take to produce 4kW of electricity for 14 hours?


Posted May 4th, 2010 by admin 3 Comments »
battery backup
. asked:


I am wanting to get a battery backup system for my house at night time. The batteries will be recharged by solar panels during the day.

best battery to use for a backup house system?


Posted February 16th, 2009 by admin 5 Comments »
battery backup
John M asked:


i have built a makeshift backup lighting system for my house and would like to know what the best battery would be. i also plan to expand this system to power more equipment, maybe even the whole house. i am currently using 3 car batteries.also, where can i get good solar panels and a battery charger for them for a reasonable price?
i live in Pennsylvania and i am just in search of stuff for a backup system for 24-48 hours of runtime
jivepacketrat, i had the same idea, i had some old useless batteries that wouldn’t work right so i strung them together and a week later they were working fine.

Why don’t passenger planes have a backup battery for cockpit?


Posted January 13th, 2009 by admin 11 Comments »
battery backup
Lt. Dan asked:


The cockpit is powered by energy made from the engines right? So why doesn’t the cockpit have like car batteries or something in case of emergency and the engines shut down. I saw an episode of mayday where all the fuel leaked out, the engines shut off, and like 95% of the cockpit instruments were rendered useless. All they had was that little propeller thing that’s deployed to make a little power. What’s that thing called by the way?