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sundug

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Reply with quote  #1 
“Sun Bandit is just as efficient but with much less maintenance than old-style solar thermal systems, something many of our customers used to complain about,” said Deltec Home Green Building & Sustainability Manager Leigha Dickens. “Combined with our super-efficient panelized home systems, it makes achieving net zero much easier.” According to the Department of Energy, heating water is the second-largest energy expense in most households.

Beedon says Sun Bandit’s solar water heating solutions eliminate fluids, leaks, pump stations, overheating, stagnation, freezing and the complicated installation and maintenance issues that can erode the value proposition of solar water heating.
http://cleantechnica.com/2016/07/30/worlds-first-pv-powered-solar-water-heating-solution-delivers-net-solar-value/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+IM-cleantechnica+%28CleanTechnica%29

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SolarInterested

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Both temperature rise and airflow are integral to comparing hot air collectors
sundug

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I wonder about cost and efficiency, we know a good hydronic SHW system can achieve 50-80% efficiency, and PV is around 15-20% at the panels. For us DIYers, I think we are still better off with hydronics than PV to resistance for heating water, but I can see the PV advantage in installation and maintenance differences for the masses. I have heard of off grid PV owners routing excess solar electricity to their electric water heater resistance elements, so I also wonder why Sunbandit seems to require their hot water tank. Only difference I see is placement of elements, and maybe a sensor. Sundug


 
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SolarInterested

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There's also the situation where the water tank reaches it's design temperature and the heating element switches off. Meanwhile the sun may still be shining and that energy is wasted. They promote it as an offgrid system so it would need a battery bank to store energy in this situation.
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Both temperature rise and airflow are integral to comparing hot air collectors
sundug

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Reply with quote  #5 
I don't think it would need a battery when the tank was up to temp, PV panels can sit in the sun with an open circuit, but I agree it would be wasteful. I know several off grid folks, and quite often their battery banks are filled  by noon, the regulator opens the circuit, and the sun juice goes nowhere. Sundug

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