I have a temp roof built at school at a 45 degree angle and we get snow build up if we get over 4 inches or so. Any less and it usually melts.
Pole mounts seem fine here as well. Jesse Sent from my iPhone On Jan 3, 2011, at 3:09 PM, toddc...@finestplanet.com wrote: > Snow removal never seems to be an issue as in the winter the panels are at a > steep enough angle to shed any buildup. Around the Mount Shasta (we got 6' in > 3 days last winter) the only problem I have encountered is when there is so > much snow so that when the slide off the modules builds up a pile tall enough > to meet the bottom of the array, no more will slide. It then needs to be > manually removed. This is why my pole mounts typically have the bottom edge > of the array at maximum winter tilt at least 6' off the ground. > > Todd > > > > On Monday, January 3, 2011 12:19pm, "Jesse Dahl" <dahlso...@gmail.com> said: > > The snow removal system really interests me. Being in northern Minnesota, we > get a lot of it. I have one student that is responsible for snow removal now, > but I haven't come up with anything else. I will be watching this thread > intently! > > Jesse > > Sent from my iPhone > > On Jan 3, 2011, at 8:10 AM, "Jason Szumlanski" <ja...@fafcosolar.com> wrote: > >> One idea would be to put each microinverter on a separate A/C circuit and >> measure the current using a device like an eGauge or a revenue grade >> metering device. That would give you backup/redundancy for the Enphase >> numbers. With 16 modules/circuits in your system, that’s not too difficult >> to monitor. >> >> >> >> For the second system, what about putting the system on a tracking rack that >> tilts to vertical once a day in the morning to dump snow. We don’t deal with >> much snow down here in Florida, so I’m not sure if that would 100% dump the >> snow off and how ice accumulation is dealt with… Born in Winnipeg, but left >> the snow behind many years ago… >> >> >> >> Jason Szumlanski >> >> Fafco Solar >> >> >> >> From: re-wrenches-boun...@lists.re-wrenches.org >> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Rob Harlan >> Sent: Monday, January 03, 2011 1:25 AM >> To: re-wrenches@lists.re-wrenches.org >> Subject: [RE-wrenches] Reference PV System >> >> >> >> >> I am working with the City of Edmonton, Alberta to develop a reference >> system. The intent is to provide accurate data for owners of systems within >> the city limits to use to verify their system performance. It is seen as a >> great way to insure quality installations under their municipal grant >> program, as well as a way to provide some real life performance data for >> system sizing and installation recommendations. The City is considering >> tying the dispersal of system grants to verified performance. (We are >> hoping to eventually have a municipal performanced-based FIT, but until >> then...) >> >> At this point the plan is to permanently install modules at eight different >> orientations to imitate common installations: >> >> True South 18.4 degrees ( Equivalent to a 4 in 12 pitch roof) >> True South 26.6 degrees (Equivalent to a 6 in 12 pitch roof) >> True South 45.0 degrees (Equivalent to a 12 in 12 pitch roof) >> True South 53.0 degrees (Latitude) >> True South 70.0 degree pitch (the estimated best angle for year round >> performance in Edmonton when snow is not removed) >> True south 90 degree pitch (Equivalent to a vertical wall installation) >> SE 18.4 degrees ( Equivalent to a 4 in 12 pitch roof) >> SW 18.4 degrees ( Equivalent to a 4 in 12 pitch roof) >> >> We will probably install two modules at each orientation to provide >> redundancy to back up possible equipment malfunction. Each module will have >> its own micro-inverter uploading data to a website. The system will be >> installed on a municipal building, probably a firehouse. >> >> We are also considering installing a second, identical system which would >> have snow removed once a day (at daybreak). This would provide owners >> considering snow removal with comparative data. The challenge here is how >> to consistently remove accumulated snow. We probably will not be able to >> get municipal staff to carry this out so we are looking into automated >> systems. >> >> So gentlemen I would love to get your thoughts: >> >> Anybody familiar with PV reference systems developed by other >> municipalities? Have they been successful? >> Have you found the Enphase Envoy to be consistently accurate? >> >> Does anyone have a reliable automatic snow removal scheme with a track >> record? We are putting it out to the University of Alberta mechanical >> engineering department to see what they come up with but I know this has >> been grappled with many times before. >> >> Thanks much in advance for your input. >> Rob >> Rob Harlan >> Executive Director >> Solar Energy Society of Alberta >> www.solaralberta.ca >> off...@solaralberta.ca >> (780) 439-5608 >> >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > > > > Sent from Finest Planet WebMail. > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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