Bucky July 16, 2020 02:44 AM I invented something like this, a long time ago.The parabolic mirror was made of regular PV cells, coated with IR reflecting foil.That way you don't need to cool the PV cell and it still works when cloudy. -dphiBbydt July 16, 2020 04:28 AM Concentrators work best with direct sunlight. As per Bucky's comment, for cloudy days you need a large area for scattered photon collection. An efficient foil that reflects IR but lets through PV friendly visible photons would be helpful in many situations - but does it exist? paul314 July 16, 2020 06:14 AM Wavelength-selective mirrors are way cool. I wonder if you could go another step and divert multiple different parts of the solar spectrum to PV cells optimized for that particular wavelength. Willyt July 16, 2020 09:11 AM Very neat! What about setting up opposing parabolic mirrors, one large and one small with focal points coinciding. The smaller parabola will reflect a concentrated parallel beam which can be deflected with a flat mirror to a desired target, i.e. your hybrid array, boiler, etc.My search for opposing parabolic mirrors yielded no results. Candidate for someone's thesis? NL4M July 16, 2020 09:17 AM I worked on a project like this well over 20 years ago......the issue here is the tracking - which makes residential difficult and industrial very complex. Good luck though! jerryd July 16, 2020 10:26 AM I like trough style collectors better with heat storage and a low temp heat engine working from that.Or better would be solar tubes doing the same.And 1 in 3 as just thermal as a super heater for higher temps Jason Herring July 16, 2020 11:02 AM I had a similar idea to use old satellite dishes as hybrid water heating/concentrated solar about 12 years ago, the thought being to run cooling lines behind the cells sitting on the focal point of the dish thus keeping the cells cooler while heating water for various uses (depending on the exit temp). I still have a dish w/ mirror tiles glued to it that I bought at a craft store. I tried to obtain a few multi-junction solar cells at the time but the sample price was really expensive so I abandoned it. Also, since this requires a tracker, the cost was not going to be as inexpensive as I envisioned. I started looking into passive sun tracking ideas, but... The thought was low-cost power and water heating/sterilization for off-grid communities with limited utility access, particularly in third-world countries. Adrian Akau July 16, 2020 01:56 PM Any time parabolic mirrors are used, the mirror needs to rotate to follow the sun. The cost of the tracking system increases the expense of the system. Tracking must be E to W during the day and also N to S for change of seasons. Sometimes, you cannot have your cake and eat it too. Dennis Dickinson July 16, 2020 05:31 PM 85% efficiency will bring it up to almost 12% usable power the whole problem with the solar schemes it's just like the Enron a grid-tie or batteries you have to overcome the power coming in the whole problem is measured in watts should be measured in amps John Hogan July 16, 2020 07:11 PM I've always figured that our best current use of solar power was simple old solar water heating. One conversion then boom, use it. As a nerd, friends and family have been asking me about solar for years. PV is now cheap enough to be a no-brainer, but my first question is always, "have you done the solar water heater first?" Despite the costs coming down, we're just messing around. By now PV should have been a cheap coating on most exterior surfaces of a structure. Some added during manufacture, like tiles and corrugated roofing. Others sprayed on in layers after initial construction. Lower efficiency but vastly higher overall output. This era feels like the end of the olden days lol.