[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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