[RE-wrenches] Efficiency Curves of Fronius Inverters?
Jeff Clearwater, Village Power Design
jeffc at villagepower.com
Wed Jul 8 15:35:27 PDT 2009
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
http://www.nabcep.org/
Village Power Design/NorthEast Solar Design
Turnkey Solar Design & Installation for the Commercial Sector
http://www.villagepower.com
gosolar at villagepower.com
Voice: 413-259-3776
Fax: 413-825-0703
65 Schoolhouse Rd
Amherst, MA 01002
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