Nick,
Fronius sells a heavy copper buss bar which will link all the six
inputs together. They look sort of like the Outback PSPV bus bars
except copper and MUCH heavier. If you need four or more inputs you'll
need to get two of them. Three or less, cut one in half. For some
reason known only to Fronius in Austria, if Fronius US orders two of
those buss bars in one packet, it costs more than two ordered
separately. Drives Gord nuts, but that's the way it is. I just
installed a 11.4Plus recently with the buss bars and it worked out
pretty well. I never looked to see if there were individual fuses but
it worked right out of the box, so....?
Combining on the roof with HV touchsafe fuses and holders is still the
way to go, IMO, however if you are going to use a HU361 DC Disconnect
at the inverter with four strings, you will likely need to run down
two sets of home runs so as not to overload the poles which need to be
derated from 30A by the usual 20%. Or, go to a 60A Disco which is
probably more expensive than a second set of wires.
Hope this helps.
Bob-O
On Jun 20, 2009, at 12:23 PM, Nick Vida wrote:
hey Wrenches.
I opened my soon to be installed fronius IG Plus to see what was going
on in there, and found myself a bit disappointed. There is a 6 string
combiner in there which is fine, however there is no bypass for the
fusing section and the terminals are rated at 20 amps. In a situation
where you have 6 strings, you cannont combine on the roof and run down
with a pair of conductors, instead you must run down with your
strings. This means instead of running 3/4 conduit for 8awg pair and
ground, I would have to run 1" conduit for 6 pairs of 10 awg and ground.
(thats a lot of flex for a 2x4!!) So if I need a disconect on the
roof, I would need 2 disconects, and correct me if im wrong-- but i
would need 4 disconects in the future because this is a
transformerless inverter.
I also noticed that they are still using those mediocre white plastic
terminals for the ac connection that so many people found annoying.
And fyi, there are no fuses in the fusing section, so dont forget to
order them.
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
