What I have done, and it passed muster of my AHJ, is to use a dual wire
aluminum set screw lug (see picture) that is connected to the SI lug
with two round copper 1/2" diameter "slugs". The cables from the battery
then attach to the bolt hole on the set screw lug using a ring terminal.
That allowed me to land MTW wire. There is plenty of room in the wire
compartment and it actually looks pretty good.
Unfortunately I didn't take a picture, or I would post it here for
hall-of-shame purposes. But the AHJ liked it and it has been working for
a year now. It certainly cost me a whole bunch of time tempered my
interest in Sunny Island inverters.
--
-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727
www.aprsworld.com
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