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Hydronic RV Heating System by Jim Phypers PV Modules provide electric power for pump and fan PV Modules provide electric power for pump and fan position of the heater core could be adjusted and hose clamps tightened. A large air intake hole was cut in the rear of the box. I found it very important to cut the hole for the heater core exactly to size to avoid air leakage and loss of efficiency. I tried connecting the pump on either side of the heater core in the closed loop. Both positions seemed...

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I used an IRFZ40 MOSFET to rest the adder by shorting out the capacitor C1. Other MOSFETs such as the IRF511 (Radio Shack 276-2072) will probably also work. Note that the MOSFET has an integral diode to keep the tantalum capacitor from going more than a few tenths volt reverse polarity. Figure 4 shows the COMPARATOR section in detail. It uses an LM339 comparator. As there are 4 comparators in a single LM339 package, the other 3 comparators are available for a 2nd Amp-hour meter or other...

Home Power

THE HANDS-ON JOURNAL OF HOME-MADE POWER Contents Careers in Renewable Energy People- 40 Solar Pathfinder & Bernie Haines Hornbrook, CA 96044-0130 916-475-3179 A vision with a task is but a dream. A task without a dream is drudgery. A vision with a task can change the world. (from HP reader Carolyn Mercer-McFadden) STI students raise photovoltaics in downtown Carbondale, Colorado. Story on page 6. Hnmo POWer 26 Donomhor 1QQ1 .lanuan 1QQ2

Cruising Equipments Amp Hour

Cruising Equipment introduced their first battery Ampere-hour meter two years ago. It rapidly became everyone's first choice for system instrumentation. Well, the fine fellows at Cruising haven't been idle. They have invented a new model Ampere-hour meter with radically better features, more intelligence, and it measures two systems at once A battery Ampere-hour meter keeps a net count on current flow into and out of the battery. It is a meter that tells us how much electric energy has been...

Windseeker Ii Wind Generator

12 volt, 250 watt 795 24 volt, 300 watt 845 19 lb., 5' blade, fits 2 pipe tower. 15 shipping Forever Light II Solar Key Chain Light 4.95 USED EQUIPMENT 4000 watt WhirlWind Wind Generator 1250 12 volt Shallow Well Jet Pump, A Y McDonald Model 810103DJ, 1 3 HP 300 watt motor, 5 GPM 15'suction, heavy built, 35 . 750 new 450 All shipping costs listed in ad are to 48 states. Contact us if you need more shipping info. Please see our catalog for more information on all our products. PrjfOQ gro ci ihig...

Energy

After the day's work was done at the recent Solar Technology Institute PV seminars, we'd gather at the local pub for food, brew, and mostly for talk. These BS sessions turned out some incredibly fruitful information. The best of the lot concerned the business aspects of renewable energy. Everyone saw an industry emerging from infancy. Everyone wondered where the opportunities were for immediate and meaningful work. A renewable energy RE industry was a dream ten years ago. A dream kept alive by...

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Figure 6 shows the POWER CONVERTER circuitry in detail. I used a 1 2 Amp fuse although a smaller fuse 1 4 Amp should also work fine. The fuse was placed in a Radio Shack 270-1211 inline fuse holder. An On-Off switch after the fuse could be added also. Four op-amps are used, with 3 being in one LM324 package U3 and the 4th in another LM324 package U4 . Do not attempt to combine these op-amps any other way as their power pins are hooked-up differently U3 uses 12 and GND, U4 uses 5 and -8 . Be...

Solar Powered Boat

N 1989 I had to decide what to do during my one-year sabbatical, a much-needed break from my teaching duties at the Minneapolis College of Art and Design. My desire to make a meaningful contribution to an environmental issue combined with my interest in boating and solar energy resulted in the decision to develop a solar-powered boat. My background in mechanical and electronic engineering and industrial design provided the foundation, and a week of volunteering at the second American Tour de...

Simple RV Hydronic Heating System

Conventional forced-air heating systems have fixed heat output and are either on or off. Hot water heating offers gentle, continuous heat and adjustable heat output. A simple hydronic system using a hot water circulating pump, large fan, and automotive type heater core transformed a poorly heated 24 foot travel trailer into a comfortable, evenly heated home. The system was a big improvement in efficiency, economy, quietness, and comfort over the propane forced-air furnace it replaced. The...