Batteries will last longer if they are not discharged more than about 20% of their capacity. Deep discharging should be rare. This implies that a battery bank is properly sized if it is about five times the daily load.
A Small Off-Grid PV System
Control and Monitoring
This shows how much SJ is paying per kwh for electricity right now. Rate changes hourly.
"For years, everyone thought Noah was paranoid & crazy ... until it started raining ..."
Fixtures that trap heat inside, like this one, shorten CFL bulb life.
A Simple Solution
Rotating the fixture 180 degrees helps to keep the CFL electronics cooler. It's been more than 12 months since I've rotated this fixture, and I've had no burn-outs.
Acid Mine Drainage Site Tour. Near Carbondale Illinois.
Seepage from an abandon coal mine caused the "dead zone" you see behind me. Cleaning it up is just one of the costs of burning coal to produce electricity. Clean Coal is an Oxymoron!
Proof of Global Warming
"If you can't measure it, you can't control it." Kevin Donovan, Data Center Manager, NREL, Golden CO.