As with electrical production the system must be sized to the user's needs. Comparing the parallels with electrical production may make sizing easier to understand.
• BTUs gained per day»watt hours of charging
• Storage in gallons of water»amp hours of battery storage
• Usage in gallons of water»amp hours of load
Here are some things to consider when sizing (gallons of usage per day) your DHW system.
• Numbers, length and temperature of showers/baths per day
• Future or present hot tub heating requirements
• Future or present hydronic heating requirements
An "average" (HOME POWER readers would most likely consider this excessive) household of 2-3 would need a minimum of 50 gallons of storage and 1 4x8' (32 sq. ft.) of absorber panel. This is strictly ball park. Usage needs will determine system size. STOVE LOOPS
Unlike solar electric systems, sun/heat energy can also be transferred by a coil/loop inside the wood stove. You can make your own out of steel or copper pipe or purchase a much superior unit made of stainless steel from the folks at Hydrocoil in Grass Valley, Ca. By incorporating solar hydronic panels on the roof for production in the summer months and a wood stove loop for the less sunny winter months, domestic hot water production can be maintained year round, and storage tank capacity reduced.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.