I have had a couple of experiences with PV water heating and over a thousand, thermal systems. Unfornatulay I have little comparison measurements. The reason is it is so hard to get thermal measurements, or so expensive to make thermal measurements. From personal experience, I do not see any reason to do any more thermal hot water. My side by side measurements, (poor thermal numbers) indicated almost equal performance per square foot of absorber or cells over the year. The PV systems are much lower cost, per unit area, and more reliable. Shaded PV outperformed thermal, I can not explain that. It may have depended upon the shading, The best thermal was on a drain out. performance from Memorial day to Labor day on a campground open sky, 50 incoming water, a Solar fraction of less than 5% , using the simple thermal gain from ambient and solar on a single glazed selective surface, 30% of solar radiation to heat. The winter side the PV has always won. This past summer a retired couple turned off their electricity and powered their hot water system from only 1200 watt solar array, they said no problem until the storms of November with a period of 5 days no sun.
On Sat, Nov 11, 2017 at 11:32 AM, Dana <d...@solarwork.com> wrote: > I installed one SunBandit solar hot water system about 1.5 years ago and > the client is still thrilled with the performance. It is a well-constructed > system. My only consideration is it arrives in one very heavy crate that is > a monster to handle & uncrate. The tank is a beast, very heavy to move > around, but well-constructed. > I would give this design & system, both 5 stars & 2 thumbs up. > > After many years of solar thermal glycol installations there are many up > sides to this product. > No plumbing - no glycol. > No excess heat issues to address during late summer. > Once the tank is hot the PV just idles. > No power out issues - steam buildup. > No pumps to maintain - replace. > Everything is very heavy duty constructed almost to the point of too heavy > duty. > > I was sufficiently impressed with the system to consider one on my current > home project but between solar thermal direct injection to the slabs and > 6.4 KW of excess PV in the summer, I am doing a hybrid system. Once the > battery bank is full, shunting the excess PV to a 240-volt electrode as > needed and & in the winter using excess PV production as available & solar > thermal once the slabs are sufficiently warmed. I am using the SOLARLOGIC > controller to address the control of the solar thermal decisions. > http://www.solarlogicllc.com/products/slic-solarlogic- > integrated-controller/ > > ------------------------------------------------------------ > ---------------- > Dana Orzel Great Solar Works, Inc. > 208.721.7003 d...@solarwork.com > Idaho Contractor - # 028765 Idaho PV # 028374 > NABCEP # 051112-136 www.solarwork.biz > "Responsible Technologies for Responsible People since 1988" > Please consider the environment before printing this email. > > > -----Original Message----- > From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On > Behalf Of Kirpal > Sent: Saturday, November 11, 2017 9:56 AM > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Subject: [RE-wrenches] SunBandit Solar PV Hot Water > > Hi Folks!! Wanted to collect any feed back from anyone who has used the > SunBandit Solar hot water systems. Working well? Not working well? I > just installed a system on my home and of course the winter sun is scarce > so it may be a while before I get to fully asses its capabilities. I am > thinking of offering them to our customers but wanted to see if anyone had > a track record on them before I dive deep. > Thanks! > > > Sunny Regards, > Kirpal Khalsa > Oregon LRT#25 > NABCEP Certified PV Installation Professional Oregon Solarworks LLC > www.oregonsolarworks.com > 541-299-0402 > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
