good afternoon I have a question with the fm100 gfci

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luisoutback
Forum Member
Posts: 10
Joined: Sun Dec 20, 2020 7:11 pm
My RE system: 1 fm100 AFCI
2 vfxr3648a
1 FNDC
24 PV TRINA SOLAR 250
4 BATTERY DEKA SOLAR 225 GEL
GRID TIE

good afternoon I have a question with the fm100 gfci

Post by luisoutback »

good afternoon I have a question with the fm100 gfci controller. I'm testing it I've been 5 days with the fm100 afci I have noticed that being in float it is cloudy entering 1200 watts in pv when the sun rises and it rises to 4000 watts being it is float 53.4 battery voltage rises to 58.0 volts in batteries and it stays like that for a while in that voltage I have it in griedtie is it normal?
Mike Curran
Forum Emperor
Posts: 2030
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 VFXR3524A-01's series stacked, replaced GVFX's (2020)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS. Tigo 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 from 14 Talesun 275W, Enphase M215 microinverters, normally direct grid tied, manual switch during winter or grid outage

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

Re: good afternoon I have a question with the fm100 gfci

Post by Mike Curran »

If you have enabled auto grid tie control on your Mate3 (see screenshot from programming guide)
Screenshot_20210106-131117.jpg
it's behaving as it should. However, if it's holding at 58 volts, which sounds like your absorb setpoint, for several hours then the charge time setting on your FNDC is too high.
Screenshot_20210106-131521.jpg
On my system I have the FNDC charge time set for 4 minutes. Hopefully not to confuse you, but the corresponding absorb time setting on my charge controllers and inverters is set for one hour. This latter setting is used after a grid outage or for a manually triggered absorb cycle. 4 minutes is long enough for my battery to recover from overnight self-discharge, whereas 1 hour (which may need to be extended) restores my battery from an outage, if short.

Hope this makes sense. - Mike
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
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