That Xantrex CM LCD Digital Display looks petty nice, but at $74 ??
I read up on the C-40 weeks ago and was impressed at what it could do.
Just for charging lead-acid batteries, it should do the trick..
IIRC it's a standard 3 stage unit.
If you want the BZ (MPPT) unit, but are worried about the 100V limit,
you should investigate your panels some more. Will they ever go over 100V when in parallel? It shouldn't be to hard to find out for sure.
I know they are in use down in Australia (on homes).
Heck, the BZ HV units may have been designed for your panels..
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