200 Watts at idle?!!!

True Hybrid Energy System
Mike Curran
Forum Emperor
Posts: 1804
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

Re: 200 Watts at idle?!!!

Post by Mike Curran » Thu Mar 12, 2020 12:26 pm

I still have the high grid power draw @ idle (no PV input) problem, and had been planning to go "off-grid" and try firing up my genny to see if the high draw is still there.

Voila! Power draw with PV off is down to 130 watts! Next step is to install an isolation transformer between my grid connection and the Skybox. Hoping that solves it, but if not it'll be an expensive experiment. Stay tuned.
Generator operation w no PV.JPG
Edit:. Don't know where I got 130 watts, 440-370= 70 watts. Even better!
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

mhspohr
Forum Whiz
Posts: 41
Joined: Sun Jun 30, 2019 8:56 am
My RE system: 6.6 kW SolarWorld/Enphase and 2.6 kW Sunpower/SMA
Skybox with 10 kWh SLA (used for power outage backup only)
Tesla 2015 Model S 85D charged from the sun.

Re: 200 Watts at idle?!!!

Post by mhspohr » Tue Aug 04, 2020 2:15 pm

I thought I'd update this thread with my latest experience.
I finally installed a PV string and turned on the inverter.
The 200 W constant draw (without PV) has gone away. I now get a more reasonable approx 50 W loss from PV to grid during the day and nothing at night. I don't know why but I'm happy with this new situation.
Screenshot from 2020-08-04 14-09-34.png

Mike Curran
Forum Emperor
Posts: 1804
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

Re: 200 Watts at idle?!!!

Post by Mike Curran » Tue Aug 04, 2020 3:52 pm

Thanks for your update. It's good to hear your high grid draw has gone away with your addition of PV input.

I've gotten around the problem by setting up Skybox to use time of use rates to run my loads off the battery at night, when there's no PV input. My experience has been similar to yours in that when there's PV input, grid draw is minimal. My overnight loads are minimal so by morning there's still 85% of my battery left in case it's needed for backup, so this has worked fine, although it's obviously not the best solution. If my utility ever actually implements time of use, I expect I won't be able to use it as it was intended, unless something has changed for me as it has for you.

Maybe it's time to try disabling TOU and see if high grid use is still a problem. Stay tuned... - Mike
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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