[RE-wrenches] Conext XW+ always feeding critical loads subpanel from battery bank

[Dan Fink]

Maverick; it's 6.0 kW of PV, 2 Midnite Classic 200s, Conext XW+ 5548, and 8
Crown Embassy VRSLA 6CEA390 for 390 amp-hours, 48v. Concerns me to be
cycling those batteries every night when it's not supposed to happen as per
the permit package.
"Notes - Battery Backup: During an outage, an automatic transfer switch in
the inverter opens the grid interconnect, isolating the inverter from the
utility to prevent back-feeding the local power lines. The inverter then
draws from the battery bank to provide AC power to the backup sub-panel.
Battery power is only used to provide power to the backup sub-panel. The
Battery inverter only sells energy to the grid from the solar array when
available and not from the battery bank. The battery backup inverter is UL
1741 and IEEE 1547 compliant."

Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342



On Mon, Jul 18, 2016 at 5:23 PM, Maverick Brown <maverick at mavericksolar.com>
wrote:

> Dan
>
> Does the inverter go silent at night? (---) on the inverter display?
>
> There are lots of settings that can influence sell amount.
>
> What type and size is the battery bank?
>
> What is the solar size?
>
> Thank you,
>
> Maverick
> Cell:        512-460-9825
>
> Sent from an iPhone.
>
> On Jul 18, 2016, at 5:56 PM, Dan Fink <danbob88 at gmail.com> wrote:
>
> Installer went out of business, all I have to troubleshoot with is an
> as-built 3-line that "may or may not be right." The charge controllers are
> a pair Midnite Classic 200s. Customer complained that system selling only
> 2/3 of what was predicted back to the utility; that appears to be because
> everything out of his critical loads subpanel is running off the battery
> bank all night, every night, grid or no, so it takes 1/3 of the day to get
> the batteries charged up again every day and start selling to the grid.
>
> I have very little experience with the XW+ thus my question for the folks
> here. My plan for next week is to show up, make my own as-built 3-line, and
> recommission the inverter. Anyone else seen this sort of thing before? Hard
> to believe that an electrician would mis-wire or not wire the bypass, I'm
> thinking software setting.
>
>
> Dan Fink
> Adjunct Professor of Solar Energy Technology, Ecotech Institute
> IREC Certified Instructor™ for:
> ~ PV Installation Professional
> ~ Small Wind Installer
> Executive Director, Buckville Energy
> NABCEP Registered Continuing Education Providers™
> 970.672.4342
>
>
>
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