 |
 |
 |
   |
HOME
FOR HOME |
Savings you could expect |
|||||||||||||||||||||||||||||||
| Our systems are very efficient at capturing the sun’s energy...having the highest Eskom rebate in the 150L category in the country is no co-incidence, it is directly linked to how much power (electricity) the system saves, which is a direct result of how powerful the system is on the solar side. The 150L system produces 7.5kW of solar heating capacity a day with its 200L counterpart doing upwards of 8.5kW. Your average 150L geyser has a 3kW electric element – this gives you some idea. At Green Power we determine the energy savings of our systems based upon the calculation Eskom uses to determine the rebate they pay on the various systems that qualify in terms of their Demand Side Management Incentive Scheme. This method is accepted by Eskom to determine the amount of money paid out for each system and is therefore presumed highly accurate and conservative. Eskom Rebate Value “The value of the rebate applicable to any participating solar water heater is based on the capability of the system to replace the use of electrical energy. Each system tested by the SABS receives a system rating (Q-factor), which indicates the kilowatt-hours (kWh) of electricity it is expected to save on a typical day as determined by the SABS testing procedure.” Source: click here SABS testing procedure The detailed description of the basic thermal performance tests is given on page 3 of the SANS 6211-1:2003 is summarized to read as follows: “each test involves a solar heating period of not less than 6 hours, equally spaced about solar noon. At the end of each day...the accumulated hot water is drawn off...and the energy output for each test day is determined by measuring the area under the curve and above Tc.Vs/20. Output of Green Power products as measured in the SABS testing procedures
Summary of results above The electricity savings, for each size of system, will be as follows:
Your water heating costs before installing solar heating It is easy to determine the cost of a geyser in the following manner: Element size (in kW) multiplied by 4 (the average number of hours a geyser element operates in a day) multiplied by your current electricity tariff per kWh, multiplied by 30 (to determine the water heating cost for a month). |
||||||||||||||||||||||||||||||||
