[RE-wrenches] TL inverter with long DC Feeder
William Miller
william at millersolar.com
Mon Oct 6 11:40:02 PDT 2014
Wrenches:
We are getting up to speed on using transformer-less inverters. I have
advocated long for the additional safety offered by these inverters but I am
realizing the trade-offs with the new technology: The implementation gets
more complicated with the requirement for PV wire, OCPD and disconnecting
means for plus and minus and plus providing Arc Flash rated equipment.
I am currently designing a system that will locate the PV about 400 feet
from the residence. The system will utilize 2 Solectria 5200 watt inverters
at the residence. I would like to provide disconnecting means for the 4
strings at the array, in case of any needed service or excavating.
Preferably I'd like the disconnecting means to be deployable by a lay person
(i.e. the gardener).
Finding an 8 pole, arc flash, 600 VDC rated disconnect is not easy. I could
install an Outback 8 circuit combiner with 8 touch-safe fuse holders. The
new combiners have had dead-fronts for a while now. The gardener needs only
to have a Philips screw driver to open this cover. Any better ideas out
there?
Thanks,
William
Gradient Cap_mini
Lic 773985
<http://www.millersolar.com/> millersolar.com
805-438-5600
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