High & Low battery restart setpoints

True Hybrid Energy System
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Mike Curran
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Posts: 1817
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 - replaced MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied

Outback Skybox - Barn roof: (2019)
- 14 Talesun 275W in series (DC array input to SB inverter/charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input (manual switch during grid outage only) from 14 Talesun 275W,
Enphase M215 microinverters, normally direct grid tied

All self-designed and self-installed
Location: Chagrin Falls, Ohio

High & Low battery restart setpoints

Post by Mike Curran » Sat Feb 22, 2020 2:28 pm

2 questions about these restart setpoints:

1. Should the low restart be set slightly higher than the low battery cutout setting?
2. Should the high restart be set lower than the high cutout setting?

I ask because I had them set the other way (Edit: I was lazy, left them at the defaults) and changed because I think the answer to both these questions is "Yes". I had some high battery cutout events today, I think because grid voltage rose above what the Skybox could maintain a connection to and the sudden disconnect caused the battery to go high.

Here's how they're set now, after changing them:
Any advice on other setpoints is also welcome.

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