Q. It is not very sunny today, will the solar water heating system work?
A. Best performance is achieved with direct sun light, however energy savings is guaranteed even in cloudy days thanks to diffuse radiation.
Q. Does the solar system work at night?
A. No, the system only works in daylight. At some times of the year there is insufficient daylight and that is why every system has a back up heating source
Q. I have heard that global warming is caused by carbon dioxide and other greenhouse gases, do solar solutions reduce these pollutants?
A. Your Solar Hot Water System produces no emissions whatsoever. It is entirely without any discharge of greenhouse gases or other pollutants. In fact, each kWh produced by solar energy saves 0.24 kg of CO2 emission.
Q. How much carbon dioxide does my system save?
A. Each kWh produced by solar energy saves 0.24 kg of CO2 emission. A 2 m2 collector produces in Israel approximately 6kwh daily. A 2 m2 system with 340 days of consumption will save 500kg of carbon dioxide a year. Over 15 year of service it will save 7.5 tons.
Q. Is energy was used in order to make the collectors?
A. Yes, but the energy used in manufacturing the system will be recovered after only two years of use.
Q. Does the system still work in very cold weather?
A. Yes, the system will work in cold temperatures. However, it does not work if the panel is covered with snow, as this prevents light striking the absorber plate.
Q. What should I do if it snows?
A. Nothing. If snow collects on the glass surface of the collector it will rapidly melt. In fact the design is such that it will melt more rapidly from the collector surface than it will melt for other parts of your roof.
Q. I have noticed some bird droppings, dust or other dirt on the collector; do I need to clean the surface?
A. There is no need to.These will not significantly impair performance and when it next rains, they will be washed off.
Q. Shall I switch off the forced solar system when I go away on holiday?
A. No, it is better to keep it on or instead consider covering the collectors.
Q. What is the difference between solar heat and photovoltaics? Are these solar systems different?
A. Photovoltaic systems rely on silicone cells and solar energy to generate direct electric voltage, which is later inverted to usable alternating current at net voltage. The total PV system efficiency is 10%. 13% for the module itself. Solar systems that use solar heat, rely on the sun's radiation to heat the water in solar collectors. The heated water is collected in a storage tank. Average solar water heating system efficiency is 40-50%.