PV Gap

Terri Said:

When making a solar water heater has anyone used a Fresnel Len as the glass to increase heating?

We Answered:

They do use them, but not configured as you say.

Just using the glass won't change the amount of energy.

The proper way to use it is to put a big (much bigger than the collector) lens well in front of the collector, with the focal length chosen to concentrate the energy onto the collector.

Elaine Said:

how can to bulid thermosiphon solar water heater?

We Answered:

Take a look at "thermosyphon solar on the Internet". It's there.

Derek Said:

What's certification for selling Solar water heater in USA market?

We Answered:

Until regulations catch up with technology, solar installations will fit into a gray area as do some air conditioning and plumbing applications.

Strictly speaking, to the extent that plumbing is involved a plumbing license would be required and a plumbing inspection should take place. To the extent that electrical work is required an electrical license is required and an electrical inspection should take place.

Currently plumbers install boilers all the time and the electrical connections do manage to be completed although electricians are not present and on most residential jobs no separate electrical inspection is done. I have seen central air conditioning installed without an electrician ever present on the job and no inspection taking place.

Different parts of the country will have different local regulations. I doubt that the federal government would be able to override this trend. Our constitution says that what is not federal belongs to the states.

Simply selling units without an installation is an entirely different matter. A retailors license and all that it requires should be all that is necessary.

Bradley Said:

How does a vacuum tube solar water heater work?

We Answered:

There is no air in a vacuum.

Brandy Said:

minimum temperature required for solar water heater to work?

We Answered:

solar panels don't need heat! they need day light, it could be -5 out side but as long as it was clear Sky's you would get energy.

Billie Said:

Can anyone tell me how to get a solar water heater for about $100? It only needs to heat about 10-15 gallons.?

We Answered:

you could build your own, out of one of those black plastic drums ( available in 15 to 50 gal. sizes) you could use an animal water-trough float fill valve. elevate drum to stand in full sunlight. put a shut off valve on the fill line ( so hot water not being cooled while you are using it. Works for me at deer lease. Good Luck>

Kim Said:

What is the capacity of tank of Tata BP solar water heater of 200 LPD?

We Answered:

Solar water tanks are usually super-insulated, so that any heat generated during the day is available over the next couple of days. The number and size of the solar collectors outside vary based on the size of the tank and your location. Hot climates need half the collectors as cold climates.