FNDC

General Talk

Moderators: OutBack, OutBack Moderator Team

Post Reply
jbakker
Forum Guru
Posts: 215
Joined: Fri Feb 23, 2018 5:47 am
My RE system: 2 VFX3648 Inverters 2 FM60 150VDC Charge Controllers Mate3 3.4 KW of panels 15kw JC Onan NG Generator made in 1975 I love that generator almost as much as my wife.
7 banks of 14 cells each from a 2017 Chevy Volt. Parallel for the AMP Hour. 7 Chinese made BMS systems.
Location: Goderich Ontario Canada

FNDC

Post by jbakker » Wed May 20, 2020 9:51 am

I think its time to reset my FNDC. It's saying 100 percent charge but the battery voltage is not matching that.
Battey charged is voltage is 58.1 and as you can see not there yet.
FNDC.jpg


I will do so when I get home.

provo
Forum Guru
Posts: 319
Joined: Thu Jul 27, 2006 4:34 pm
My RE system: Sixteen Evergreen EC-120
(4 strings, total 1920W)
Eight Rolls S-550 (2 strings, total ~800Ah @ 24V)
One FM80
One VFXR3524A
Hub 10
Mate3s
Trimetric
Location: Sierra foothills

Re: FNDC

Post by provo » Wed May 20, 2020 10:52 am

I'm assuming when you reset, it stays right for some period. How long does it take to get this far off?

jbakker
Forum Guru
Posts: 215
Joined: Fri Feb 23, 2018 5:47 am
My RE system: 2 VFX3648 Inverters 2 FM60 150VDC Charge Controllers Mate3 3.4 KW of panels 15kw JC Onan NG Generator made in 1975 I love that generator almost as much as my wife.
7 banks of 14 cells each from a 2017 Chevy Volt. Parallel for the AMP Hour. 7 Chinese made BMS systems.
Location: Goderich Ontario Canada

Re: FNDC

Post by jbakker » Wed May 20, 2020 12:06 pm

It stays good for about 4 to 6 months.

The reset will make the FNDC learn the battery.

raysun
Forum Emperor
Posts: 2058
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: FNDC

Post by raysun » Wed May 20, 2020 12:51 pm

jbakker wrote:
Wed May 20, 2020 12:06 pm
It stays good for about 4 to 6 months.

The reset will make the FNDC learn the battery.
My VRLA battery gets cycled daily, so I guess that helps the FNDC stay on target. Whenever I go through a manual calculation of SoC, it's always spot-on (within 2%, but usually the same.)

provo
Forum Guru
Posts: 319
Joined: Thu Jul 27, 2006 4:34 pm
My RE system: Sixteen Evergreen EC-120
(4 strings, total 1920W)
Eight Rolls S-550 (2 strings, total ~800Ah @ 24V)
One FM80
One VFXR3524A
Hub 10
Mate3s
Trimetric
Location: Sierra foothills

Re: FNDC

Post by provo » Wed May 20, 2020 12:58 pm

jbakker wrote:
Wed May 20, 2020 12:06 pm
It stays good for about 4 to 6 months.

The reset will make the FNDC learn the battery.
Are you using the FNDC to control the absorb (SOC or Return Amps ... I'm not sure yet how that works exactly)?

Or is the reset just to make the battery voltage agree with the SOC graphing in Optics?

raysun
Forum Emperor
Posts: 2058
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: FNDC

Post by raysun » Wed May 20, 2020 1:13 pm

provo wrote:
Wed May 20, 2020 12:58 pm
jbakker wrote:
Wed May 20, 2020 12:06 pm
It stays good for about 4 to 6 months.

The reset will make the FNDC learn the battery.
Are you using the FNDC to control the absorb (SOC or Return Amps ... I'm not sure yet how that works exactly)?

Or is the reset just to make the battery voltage agree with the SOC graphing in Optics?
I use the FNDC for Charge Termination using the Charged Parameters Met flag. It works well for me.

You'll need to do a bit of experimenting to get it dialed in. The key is establishing a good value for Charged Return Amps.

provo
Forum Guru
Posts: 319
Joined: Thu Jul 27, 2006 4:34 pm
My RE system: Sixteen Evergreen EC-120
(4 strings, total 1920W)
Eight Rolls S-550 (2 strings, total ~800Ah @ 24V)
One FM80
One VFXR3524A
Hub 10
Mate3s
Trimetric
Location: Sierra foothills

Re: FNDC

Post by provo » Wed May 20, 2020 1:42 pm

raysun wrote:
Wed May 20, 2020 1:13 pm

I use the FNDC for Charge Termination using the Charged Parameters Met flag. It works well for me.
You'll need to do a bit of experimenting to get it dialed in. The key is establishing a good value for Charged Return Amps.
I've read about that -- I'm a bit leary of it :grin: ! Sounds like a recipe for undercharging, which I did on my first pack. I think my Rolls FLA's are fairly robust as far as overcharging goes. But I'll look into it, for sure.

raysun
Forum Emperor
Posts: 2058
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: FNDC

Post by raysun » Wed May 20, 2020 2:19 pm

Yea, your biggest problem will be water replacement. For VRLA batteries overcharging leads to capacity loss.

SandyP
Forum Guru
Posts: 359
Joined: Tue Jun 21, 2011 4:44 am
My RE system: 8 x 190W 24V Suntech panels (4 strings of 2)
4 x 325W 24V Suntech panels (2 strings of 2) added Sept2018
Mate2
Outback FM60 MPPT (max output lowered to 55amps)
12 x 2V Hoppecke GEL 660 Ah C100 - 24V System
Outback VFX3024 Inverter/Charger
Victron BMV-602s
Honda 5.5kW Genset
Location: Victoria, Australia

Re: FNDC

Post by SandyP » Wed May 20, 2020 4:34 pm

raysun wrote:
Wed May 20, 2020 1:13 pm
../.. The key is establishing a good value for Charged Return Amps.
Out of interest, what Charged Return Amps (as % of battery capacity) do you use?

raysun
Forum Emperor
Posts: 2058
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: FNDC

Post by raysun » Wed May 20, 2020 4:48 pm

SandyP wrote:
Wed May 20, 2020 4:34 pm
raysun wrote:
Wed May 20, 2020 1:13 pm
../.. The key is establishing a good value for Charged Return Amps.
Out of interest, what Charged Return Amps (as % of battery capacity) do you use?
7.5A. About 2% for my battery.

The VRLA tend to be less "sloppy" than FLA, so the Charged Return Amps can get quite low. (After 4 years, a "Freshening" aka "EQ" charge can still drive the accepted amperage to about 1.5A.) I picked 7A initially and always hit it at exactly 2H of Absorb that is recommended for my battery. Lately, increasing loads during charging, or some other factor, has nudged it up a bit. I'm deciding to stay with the 2HR max Absorb time to keep capacity loss and grid corrosion at a minimum, rather than trying to drive the End Amps lower.
Last edited by raysun on Thu May 21, 2020 8:35 am, edited 2 times in total.

jbakker
Forum Guru
Posts: 215
Joined: Fri Feb 23, 2018 5:47 am
My RE system: 2 VFX3648 Inverters 2 FM60 150VDC Charge Controllers Mate3 3.4 KW of panels 15kw JC Onan NG Generator made in 1975 I love that generator almost as much as my wife.
7 banks of 14 cells each from a 2017 Chevy Volt. Parallel for the AMP Hour. 7 Chinese made BMS systems.
Location: Goderich Ontario Canada

Re: FNDC

Post by jbakker » Thu May 21, 2020 4:19 am

Battery AH:400 ah
Charged Voltage:57.5
Charged Time: 3min
Charged Return Amps:8
Charged Factor: 94 percent

Now that there is decent weather here and some good sunny days I am meeting my charged parameters met settings.
I am also running a Chevy Volt Battery and only running one Outback CC as the other CC is a Midnite unit.

The system is working well.
Trying to get the better half to let me install DC Inverter AC Compressor 4 panels on the roof and small battery bank will run the unit for 18 hours straight before the battery bank is discharged. I would like it to have the ability to switch to the AC grid if needed. Still researching this.

SandyP
Forum Guru
Posts: 359
Joined: Tue Jun 21, 2011 4:44 am
My RE system: 8 x 190W 24V Suntech panels (4 strings of 2)
4 x 325W 24V Suntech panels (2 strings of 2) added Sept2018
Mate2
Outback FM60 MPPT (max output lowered to 55amps)
12 x 2V Hoppecke GEL 660 Ah C100 - 24V System
Outback VFX3024 Inverter/Charger
Victron BMV-602s
Honda 5.5kW Genset
Location: Victoria, Australia

Re: FNDC

Post by SandyP » Thu May 21, 2020 6:47 am

jbakker wrote:
Thu May 21, 2020 4:19 am
.../...
Charged Factor: 94 percent
Yes the battery bank charge factor is quite important and may take some experimenting with at installation to get it correct.
Also, the charge factor will change over time as Lead based batteries age (not sure about Lithium) so further adjustments needed down the track

Post Reply