Newb Questions

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bikermiker
Forum Junior Member
Posts: 4
Joined: Tue Aug 20, 2019 3:45 pm
My RE system: Outback Radian 8048
FM100 (x2)
FlexNet DC
Simpliphi 3.8 LFP Batteries (x8)

Newb Questions

Post by bikermiker » Sat Nov 23, 2019 8:04 pm

I am a new owner of a Radian GS8048 system with a Simpliphi battery bank. I'm not understanding the shunt readings on the the FlexNetDC. Shunt A is always showing negative numbers and B/C are positive. A is going to the inverter.

What is the deal with the negative numbers?

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Gwendoly Espe
Applications Engineering
Posts: 198
Joined: Wed Feb 22, 2017 11:04 am

Re: Newb Questions

Post by Gwendoly Espe » Sun Nov 24, 2019 5:06 pm

FNDC is monitoring the State of Charge of the batteries. Check out page 6 (page 5 in pdf print) of the manual:
FNDC Manual

All shunts are wired the same, but notice that the inverter can charge the batteries or discharge the batteries. When the inverter is charging the batteries, it should be positive and when the inverter is removing energy from the batteries to the loads it should be negative since it's removing that energy. What you're saying is that your inverter must be inverting more than charging. The FM100's shunts should be positive since it shouldn't have any loads and should be depositing energy into the batteries.


I hope that explanation helps. In the future, if you have an OpticsRE account please put that in your profile. It helps us OutBack folks help you faster.
Gwendoly Espe
Applications Engineer


Alpha Technologies Inc. / OutBack Power Technologies
3767 Alpha Way Bellingham WA 98226 USA
http://www.alpha.com

bikermiker
Forum Junior Member
Posts: 4
Joined: Tue Aug 20, 2019 3:45 pm
My RE system: Outback Radian 8048
FM100 (x2)
FlexNet DC
Simpliphi 3.8 LFP Batteries (x8)

Re: Newb Questions

Post by bikermiker » Sun Nov 24, 2019 8:12 pm

Thank you for the quick reply. Still figuring out how to share the optics info.

I am assuming then that the colored cables from shunt A, to the FNDC, are wired in reverse. Batteries are charging. See screen shots.
Screen Shot 2019-11-24 at 22.08.24.jpg
Screen Shot 2019-11-24 at 22.07.54.jpg
Screen Shot 2019-11-24 at 22.07.31.jpg

Mike Curran
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Posts: 1217
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one MX60 (2007)
- 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 (2x7) Talesun 275W
- 2 SimpliPhi 3.8 batteries, 48V, 150Ah total
- future AC coupled input from both rows of Westinghouse AC modules*
- future AC coupled input from 14 Talesun 275W, Enphase M215 modules*
* waiting for firmware update from OB

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

Re: Newb Questions

Post by Mike Curran » Mon Nov 25, 2019 3:00 pm

Hey Biker - If you're off grid, then your inverter will never be charging your battery unless you're using a generator. Lacking a generator, only your FM100 charges the battery, IIUC (If I Understand [off grid operation] Correctly). - Mike
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

sodamo
Forum Czar
Posts: 598
Joined: Mon Apr 03, 2006 1:55 am
My RE system: Totally off grid - Hamakua side, Big Island, Hi
36 Trina 280 & 16 Phono 250 in 48 volt array (fixed) 14080w
Radian 8048/4048
4 FM 80 charge controllers
FNDC w/3 shunts
Mate 3s
OpticsRE - MMKL - Ninole Hi
12 SimpliPhi 3.8
14Kw Kohler 14RESA

2FX3048T
Mate 3s
10Kw MEP 803a

Honda EU7000i

Davis VantagePro2 Wx Station
On line at: http://www.weatherlink.com/user/sodamo/
Location: Ninole, Hi

Re: Newb Questions

Post by sodamo » Mon Nov 25, 2019 3:18 pm

Mike is right. Then shunt will show both in and out
Attachments
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David
Please visit http://vacation.ninolehawaii.com

bikermiker
Forum Junior Member
Posts: 4
Joined: Tue Aug 20, 2019 3:45 pm
My RE system: Outback Radian 8048
FM100 (x2)
FlexNet DC
Simpliphi 3.8 LFP Batteries (x8)

Re: Newb Questions

Post by bikermiker » Tue Nov 26, 2019 6:27 am

Mike Curran wrote:
Mon Nov 25, 2019 3:00 pm
Hey Biker - If you're off grid, then your inverter will never be charging your battery unless you're using a generator. Lacking a generator, only your FM100 charges the battery, IIUC (If I Understand [off grid operation] Correctly). - Mike
The panels are charging the batteries. What I am asking about is, if you look at "shunt A", it is showing a NEGATIVE number. Everything seems to be working fine except I'm questioning why there is a negative number.

Mike Curran
Forum Emperor
Posts: 1217
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one MX60 (2007)
- 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 (2x7) Talesun 275W
- 2 SimpliPhi 3.8 batteries, 48V, 150Ah total
- future AC coupled input from both rows of Westinghouse AC modules*
- future AC coupled input from 14 Talesun 275W, Enphase M215 modules*
* waiting for firmware update from OB

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

Re: Newb Questions

Post by Mike Curran » Tue Nov 26, 2019 6:58 am

Per Gwendoly's reply:
when the inverter is removing energy from the batteries to the loads it should be negative since it's removing that energy. 
Edit: Bottom line is the shunt is correctly showing a negative number. It will never be positive unless you connect an external AC charging source (e.g., grid or generator) to use the inverter to charge your battery and/or support your loads (depending on whether the battery is charging or not).
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

bikermiker
Forum Junior Member
Posts: 4
Joined: Tue Aug 20, 2019 3:45 pm
My RE system: Outback Radian 8048
FM100 (x2)
FlexNet DC
Simpliphi 3.8 LFP Batteries (x8)

Re: Newb Questions

Post by bikermiker » Tue Nov 26, 2019 7:39 pm

Ah.... I get it now. Thanks for working through my density there!

sodamo
Forum Czar
Posts: 598
Joined: Mon Apr 03, 2006 1:55 am
My RE system: Totally off grid - Hamakua side, Big Island, Hi
36 Trina 280 & 16 Phono 250 in 48 volt array (fixed) 14080w
Radian 8048/4048
4 FM 80 charge controllers
FNDC w/3 shunts
Mate 3s
OpticsRE - MMKL - Ninole Hi
12 SimpliPhi 3.8
14Kw Kohler 14RESA

2FX3048T
Mate 3s
10Kw MEP 803a

Honda EU7000i

Davis VantagePro2 Wx Station
On line at: http://www.weatherlink.com/user/sodamo/
Location: Ninole, Hi

Re: Newb Questions

Post by sodamo » Tue Nov 26, 2019 8:42 pm

Welcome to the club :grin:
If everyone got everything right off this would be a boring forum.
David
Please visit http://vacation.ninolehawaii.com

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