Surface Power’s solar technology is a daylight technology. Here we will look at 2 x SP501PRO systems, one is facing a southerly direction and one is facing a northerly direction. We will look at both systems towards the end of the day.

Because daylight is the only input required to achieve hot water requirements in a Surface Power system, we should see similar performance from both systems regardless of which direction they are facing. This of course is not the outcome you would expect from legacy solar type collectors which must face a southerly direction and require sun for optimal performance.

Here is the weather profile during the observations, lots of cloud, sometimes bright but cloudy at both locations. 

17:21 - First observations below of both systems are taken at 17:21. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

17:53 - Next observations below of both systems are taken at 17:53. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

18:22 - Next observations below of both systems are taken at 18:22. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

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18:29 - Next observations below of both systems are taken at 18:29. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

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19:09 - Next observations below of both systems are taken at 19:09. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

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19:37 - Next observations below of both systems are taken at 19:37. Daily Performance and Outcome is practically identical with significant temperatures achieved in cloudy weather on both systems.

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RESULT: Now you see how 2 x SP501 PRO systems (approx 5 sqm) actually ended up only a degree or two apart at the end of the day. Even though the weather was not great, they both made very credible temperatures of nearly 70C.

Next we will show you the full power curves of both systems for the day, WATCH HOW a Surface Power system produces power ALL DAY and not using the old style “differential temperature control” method of pump ON/pump OFF. This technology is patented technology only available in Surface Power solar hot water systems.