Oops

If to err is human, then my article in HP 8 should make me Superhuman. I rewrote it to include newly acquired information on pipe losses that was more thorough and accurate than previous info. What I really liked was how optimistic the new chart was. I am conditioned to use charts giving pipe flow losses in feet and I never noticed this chart was in PSI. In order for the figures to be in feet you must divide by 0.43 or multiply by 2.3. This causes the figures to more than double. If any readers...

WindPV System

I have been a renewable energy buff since the 1974 energy crisis. Windmachines for generating electrical power always fascinated me. In 1974, I bought a 200 Watt 12 Volt windcharger and installed it on a 35 foot steel tower. It generated a small amount of power for the house. At the time, I had 5 24V aircraft 35 Ampere-hour batteries (wired in series to produce a pack of 130 VDC). The batteries fed a 1kW. rotary converter, 130 VDC in and 120 vac out, which ran the house. The 12V output of the...

Using solar distillation PVs for pumping

Practically any seacoast and many desert areas can be made inhabitable by using sunshine to pump and purify water. A 10 gallon day solar still now purifies sea water for drinking, cooking and other household needs for a residence near George Town, Exuma, in the Bahamas. Solar energy does the pumping, purification, and controls seawater feed to the stills. This system uses three solar distiller pans 33 wide by 10'3 long. They are insulated, lined with a special corrosion-resistant membrane. The...

Things that Still Work

Home Power tests an Ancient PV Panel We've been telling you that photovoltaics last a long time. Well, here's living proof that PVs can handle the LONG haul. This venerable PV panel has been in the sun for more than 10 years and still produces more than its rated output. Amazingly enough these silicon marvels don't seem to wear out. In the Spring of 1977 the US Energy R& D Administration spent one million dollars on a PV powered irrigation project in Mead, Nebraska. This venture was...

Build your own Battery State of Charge Meter

Here's a simple, home-brew, project that indicates how much energy is remaining in your batteries. It's a gas gauge for lead-acid batteries, we call it the Bat-O-Meter. It is an LED bar graph voltmeter with an expanded scale. It can tell you the state of charge of your batteries from across the room, even in the dark. The Bat-O-Meter is not only very simple to build, but also very inexpensive-less than 10. in parts and about an hour of your time are all that's needed. And, in addition to the 12...