While our current $1K solar water heating system has been popular and lots of people have built it with good success, it does require the building both the collectors and the solar storage tank yourself, and that takes a bit of time.
The aim of the new system is to make the job of doing your own solar water heating system quicker and easier by using all off the shelf components that just need to be mounted and hooked up together.
A prototype system is in the works using these components:
- Collectors are 80 sq ft of plastic matt style pool heating collectors
- The tank is the 175 gallon Softank
- The controller is a standard differential controller from sun-pump
- The pump is a Grundfos HVAC circulation pump
Overview of the Components
|The 80 sf of pool heating collector in place.|
The prototype collectors are Fafco SunGrabbers bought on ebay.
The tank is the Softank kit offered by American Solartechnics. The kit goes together easily and the tank holds about 180 gallons of solar heated water.
The controller is an off the shelf differential controller from sun-pump that has all the advanced features at a not so advanced price.
|The controller -- the wiring showing here is|
most of the wiring for the whole system.
The pump is a Grundfos 15-58 three speed HVAC circulation pump. These pumps are relatively efficient and very rugged with a reasonable price.
|The Grundfos pump -- this is the rest of the wiring.|
The heat exchanger is a large coil of PEX pipe that is immersed in the tank. Cold water from the street takes one pass through this coil to be preheated on its way to your hot water tank. It is the same one that is used in the $1K system and is explained in detail there.
Plumbing and Electrical:
The system is plumbed together with easy to use CPVC pipe. This is the easiest system for people new to plumbing. You cut it with a scissors like device and the joints are just glued together. Goofs are easy to fix. There is a little bit of electrical wiring is that is easy and safe to do.
The target cost for the system is around $1300 before rebates. Depending on your rebate situation, payback may inside one year.
All the details on the Off-The-Shelf DIY Solar Water Heating System...
The "going together like LEGO's" title is no doubt an exaggeration, but the system is designed from the bottom up to be easy to put together.
Let me know what you think.