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Posted By: ringiIf I was putting in an off-grid system and the site was good for a turbine I would be sizing the system based on wind, and then only adding PV if they reduced the size of batteries I needed.
Posted By: ringiI have not looked at the output of PV on a none shaded site when mounted near vertical, maybe putting PV on a south facing wall would give better output at the times it is needed most.
Posted By: billtOne thing that you can do with panel angle is flatten the monthly average. With a low angle you will get a big peak in the summer months; a steep angle gives 2 peaks in spring and autumn with a dip in summer. Get it just right and the average is fairly flat from April to September (within the constraints of the great variability of PV output due to weather).
Posted By: ringiI expect you will need a lot more PV to cope with the 3 months of low output if you just use PV. … I have not looked at the output of PV on a none shaded site when mounted near vertical,
Posted By: Ed DaviesIf you looked you might be surprised. 6 kW on my 60° roof would, according to PVGIS, produce very nearly my current electricity usage in December (worst month) at 4.27 kWh/day vs my usage over the last twenty days of 4.4 kWh/day.
Posted By: ringiDo you get better results having all the panels at the same angle, or putting each string at a different angle?
Adding wind power reduces the probability of not having enough power a lot more the doubling the size of a PV array.
Posted By: skyewrightAdding wind power reduces the probability of not having enough power a lot more the doubling the size of a PV array.But wind also significantly increases the complexity of the system (it introduces moving parts, and those moving parts are necessarily exposed to the worst the weather can throw at them).
Posted By: djhDepends what you mean by 'better'.
Posted By: ringiLowest cost for a system that will give enough electric every day, with no more then x power cuts over the next 10 years.
Posted By: djhJust FWIW, my 4 kWp has been giving nothing like 2.8 kWh this month. But maybe it's just been exceptionally grey.
Posted By: Ed DaviesWhat angle are your panels? Dropping mine from 60°to 30°in PVGIS drops the December daily production from 4.27 kWh/day to 3.09 kWh/day.
Posted By: djhPosted By: Ed DaviesWhat angle are your panels? Dropping mine from 60°to 30°in PVGIS drops the December daily production from 4.27 kWh/day to 3.09 kWh/day.Don't know exactly but they're fairly flat (and at multiple angles, with microinverters) so perhaps that accounts for it.
Posted By: Ed DaviesMHicks, interesting: which turbine do you have? How well does it stand up to lots of wind? Do you have to mechanically brake it when it's too windy?
What is not covered by your warranty?…· Damage due to high winds and storm conditions (17m/s+, 40 mph+).…
Posted By: MHicksIt would be problematic doing that DURING very high winds
Posted By: Ed DaviesBe interested to see actual data from a successful vertical-axis turbine installation.
Posted By: MHicksThe Leading Edge website claims 'Peak output: 750 watts @ 18m/s (40mph)' and that, in my experience, is rubbish - I've never seen more than 500W and that was in pretty strong winds. Maybe it's my site.
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