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nter and summer. A check of your local weather records should provide you with an idea of average cold water temperatures (normall about 10oC / 50oF in winter and 20oC / 68oF in summer, in mild regions).Apart from the three key factors used in the calculation above, you may also need to consider:1. Annually/daily shade patterns 2. Angle/direction of installation (a less than ideal angle will reduce efficiency)6. Installation site (Do you have enough room for the collector(s)?) The estimations above are just a guide and are based on a average summer performance level of 70%. As explained above it is best not to oversize the system. Your local distributor may need to plete a onsite inspection to accurately assess your requirements and design a solar water heating system which suits your needs. For more information about performance and heat energy output please click here.Insolation Levels (Africa)Average Insolation (10 year average) kWh/m2/day CountryState/CityLatitudeLongitudeJanFebMarAprMayJunJulAugSepOctNovDecYear AvgBFOuagadougou1239。 30 ECFBangui1839。 36 ECMYaounde339。 30 WDJdjibouti1139。 09 EDZalger36 39。 E5EG Cairo2939。 09 E8ETaddis abeba939。 42 E5GHaccra539。 12` W5GMgambia1339。 39 W GNconakry939。 36 EKEnairobi139。 48 ELRliberia639。 30 WLYtarabulus3239。 11 EMArabat3239。 17 WMLbamako1239。 54 EMRnouakchott1739。 45 ENEniamey1339。 12 WNGabuja939。 11 ESDal khurtum1539。 32 ESLfreetown839。 14 WSNdakar1439。 27 WSOmuqdisho239。 20 E6TNtunis3639。 EData courtesy of: NASA Surface meteorology and Solar Energy Data SetReference: Whitlock, C. E., et al., Release 3 NASA Surface Meteorology and Solar Energy Data Set for Renewable Energy Industry Use. Rise amp。 28 N5439。 42 N9039。 55 N11639。 03 N11839。 10 N12139。 18 N11439。 11 S10639。 05 N3439。 48 N4639。 40 N5139。 16 N5939。 15 N5639。 N77 EINBombay1839。 32 EINBangalore1239。 37 EIQBaghdad3339。 24 EJOAmman3139。 57 EJPTokyo3539。 38 EKHPhnom penh1139。 51 EKPP yongyang3939。 18 EKRSeoul3739。 ELAVientiane1839。 35 ELBBeirut3339。 28EMMYangon1639。 09 EMNUlaanbaatar4739。 54 EMYKuala Lumpur339。 42 ENZAuckland36 52 S174 45 E2 NZChristchurch43 32s172 37e NZWellington41 17 S174 47 E3 OMMascat2339。 37 EPHCebu1039。 54 EPHManila1439。 58 ESARiyadh2439。 42 ESGSingapore City139。 ETHBang Kok1339。 30 ETHChiang Mai1839。 ETRAnkara3939。 53 EVNHanoi2139。 54 EYEAden12 50 N4539。 Shine 2000, the 26th Annual Conference of the Solar Energy Society of Canada Inc. and Solar, Oct. 2124, 2000, Halifax, Nova Scotia, Canada. Please note: If your region is not listed please visit the NASA website where you can search for insolation value for any areas of the world. You will need to obtain a free username and password to gain access.Insolation Levels (Europe)Average Insolation (10 year average) kWh/m2/day CountryState/CityLatitudeLongitudeJanFebMarAprMayJunJulAugSepOctNovDecYear AvgATVienna4839。 22 EBEBruxelles5039。 30 EBGSofija4239。 18 E5CYLimassol3439。 03 ECRZagreb4539。 35 EDEHamburg5339。 59 EDEMunich4839。 23 EESMadrid403