Hi Mick, Outback and midnite have a common negative design. So what you describe works fine. You can connect the PV neg to the main neg buss and then connect to the CC, works fine. Ie only 1 negative connect to the controller.
For the Schneider 60-150 controller it doesn’t as it measures on the negative side. So wouldn't work in that configuration I’m with dave on the 80-600. I can’t see it as a danger but not sure how the two controllers handle it. Would be interesting to see the output! You’re all good Jay > On Nov 7, 2019, at 2:43 PM, Mick Abraham <m...@abrahamsolar.com> wrote: > > > Greetings, Wrenchies~ > > Matt Sherald's subject today resembles a client inquiry that is on my radar > this week--perfect timing! > > Dave Angelini & All~ What if only the PV array negatives are in parallel but > the PV positives are divided across more than one charge controller? > My client is on the Outback platform instead of Schneider, the battery > negative is grounded & by extension the PV negatives are also grounded. > Client has no DC GFI since it's an older installation & he would add three > Flexmax 80 controllers; we'll put appropriate DC breakers on each PV+ > & Battery+ controller wire. Client's Mate 1 is old school so the revved up > Flexmax 100 (with no built in display) is not of much interest in this case. > > The reason the client needs to share PV negative across the controllers is > it's a retrofit situation with some wires in place & no simple > way to add more. No inspectors are involved & I see no technical problem. > Your thoughts? > > The Wrench List is the Bomb! > > Mick Abraham, Proprietor > www.abrahamsolar.com > > Landline: 970-731-4675 > Cell phone or for text messaging: 970-946-6584 > ᐧ > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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