Hey Folks,
Anyone have or know where I can get my hands on the efficiency vs.
wattage curve for the Fronius IG series (the old series - not the
Plus).
I have a 4000 in stock and wondering if I can apply it to a friend's
2660 watt system without losing much to efficiency at low power
levels.
Best,
Jeff
There are numerous options here: most ground mount manu's offer
ballasted systems, I would look to them 1st. Other systems I've seen
or used - 1) Pour a continuous surface "footer" that is large enough
in size to provide the proper ballast for the uplift in your area,
pour one along the S. edge/legs and another along the back/north
legs. 2) Tie all legs together via a horiz. rail at least 6' wide
and embed this in a rock filled gabion, again of the required
weight. 3) Limestone is easy to drill, useing a hammer drill and
extension bit drill 11/16" - 3/4" holes at least 18" into the stone
at an angle, vary all angles as viewed in plan as they relate to the
N/S line of the array (not as they relate to level), to mitgate
pull-out from them all being in a line. i.e. - 1st leg hole is 90
degrees to the N/S line, 2nd leg is 180 from this, 3rd is 45 and so
on, in other words if looking in plan and you could see all holes
they would radiate around the "face of a clock" with each leg hole
on a different "hour". Finally, epoxy in 5/8" all thread, you can
pre-bend the end to come out of the hole verticle or use a swivel
connector from Uni-strut, B-line or equal.
All of these suggestions should be run by a Structural Engineer
before embarking, thus the 1st choice of working with a manu.
Good luck!
-jeff o
From the Solar, Wind and Hydro powered office of Jeff
Oldham/Regenerative SOLutions
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~~~~~~~~~~~~~
Jeff Clearwater
Senior Design Engineer
NABCEP (tm) Certified Solar PV Installer
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Village Power Design/NorthEast Solar Design
Turnkey Solar Design & Installation for the Commercial Sector
http://www.villagepower.com
goso...@villagepower.com
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Fax: 413-825-0703
65 Schoolhouse Rd
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