Due to the 10 inches snow we received throughout the day and another 4 inches tonight. We managed to squeak out on the measly .5 kWh from our 8.1 kW system. We did use over 60 kWh's today with the addition of our heat pump, definitely used up some of the saved kWh's from this summer.
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Worst solar production day so far.
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Just wait, the days are getting shorter. (warmer, but shorter)Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister -
Due to the 10 inches snow we received throughout the day and another 4 inches tonight. We managed to squeak out on the measly .5 kWh from our 8.1 kW system. We did use over 60 kWh's today with the addition of our heat pump, definitely used up some of the saved kWh's from this summer.8.2KW 32x(PVmodule+inverter)+online monitoringComment
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I don't know how long it's going to take the snow to slide off or melt off the panels. zero production yesterday and zero today. Panels are 27° tilt.Comment
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on the ground. Standing them straight up for the time there is snow on the ground helps,
and they will also be getting energy from reflections off the snow.
When it snows overnight, I have them cleared by the time the sun is up. On the less
frequent times it snows during the day, production drops to a few percent. I suppose
that comes from reflected sun on the under side. good luck, Bruce RoeComment
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How counter-productive to power generation would it be to design a panel with a defroster? I wonder if you could salt your panels (that would leave a nice nasty residue...)?Comment
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No problem but you are talking about electric resistance heating - it would use very much power[SIGPIC][/SIGPIC]Comment
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Does than mean you definitively know that the heater would use more power than a panel would have generated minus the snow? What numbers could we assume for the heater power usage and panel power generation?Comment
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It is a loser and has been brought up many times and beat to death many times - if you want then you figure it out.[SIGPIC][/SIGPIC]Comment
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If that is the case, you can just state so. There's no reason to re-hash the exercise if it has been performed in the past. Thanks for your wisdom. It is tremendously enlightening.Comment
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to easily block the sun. I counter by pushing as much as practical up over the top and behind,
or off the sides. Still with panels at 20" ground clearance, snow in front needed to be moved
farther away. Here are some pics of what happened here; not massive snow falls, but none
of it melted till spring.
Measurements here indicate a string could be disconnected and fed to the string to defrost it.
It would take so much power that only a fraction of my total could be done at a time. The
wiring complexity and power control would be a major project. However, it should take less
than an hour, so in a few days you might come out ahead on energy.
My conclusions are that panels should be elevated to near vertical for the snow season.
Perhaps mounting them about twice as high above the grounds as these would deal better
with accumulation, but hinder manual clearing. Ideal might be to tilt them slightly past
vertical for a storm, then back after. That would require a motor, but maybe not so hard
to do after the tilt mechanism is worked out. Voids the panel warrantee I'm told. Here
the wind would be blowing the snow toward the back of the panels, or alongside, not head on.
Bruce RoeComment
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Ideal might be to tilt them slightly past vertical for a storm, then
back after. That would require a motor, but maybe not so hard to do after the tilt mechanism
is worked out. Voids the panel warrantee I'm told. Here the wind would be blowing the snow
toward the back of the panels, or alongside, not head on.
Bruce Roe
A shop compressor with a two way valve for control.
Get on it. lol6k LG 300, 16S, 2E, 2W, Solaredge P400s and SE5000Comment
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