Hello ASES Community:
We have a Xantrex/Trace SW4024 with a Gridtie Interface module that's been running reliably for 20+ years. Recently we upgraded some panels (after discovering some of the AstroPower ones had failed), and to increase production to cover a heat pump water heater. We also upgraded the Charge Controller, which allows us to monitor daily harvesting. We have a small (450Ah) battery backup to a mission critical circuit panel; our PG&E / SF Bay Area grid rarely drops but nice to have power on any occasion it does.
With the new setup and being home more through the pandemic I've noticed a curious pattern, that with comparable weather we often produce more on weekends than weekdays; the inverter will drop offline around the middle of the day, sometimes repeatedly, but again only on some weekdays, and never on the weekend.
Curiouser and curiouser.
Has anyone ever witnessed a similar phenomenon? Or do any of you brilliant people have a theory to the cause, or a recommended next step towards solving this? I'm guessing the grid is to blame, but have never noticed the AC input vary from 120V more than a few volts, and the Hz is steady as well. I'm tempted to think something on our end is awry, but the pattern suggest otherwise.
Thanks in advance for any insight anyone has to offer,
David
* * * * *
Arkin Tilt Architects
Ecological Planning & Design
with a fundraising goal of $3,000 to support Climate Ride and their
scholarships for young climate leaders. Thank you!
David Arkin, AIA, ArchitectLEED Accredited ProfessionalCA #C22459/NV #50301101 8th St. #180, Berkeley, CA 94710510/528-9830 ext. 202www.arkintilt.com"There is no way to peace. Peace is the way."- A. J. Muste