Skybox SOC reset with Simpliphi batteries

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Mike Curran
Forum Emperor
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

Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Sun Jan 12, 2020 9:35 pm

I recently ran my Simpliphi bank down to 44% SOC, and found that the recommended absorb time and voltage settings of 1 hour and 54.4 volts respectively, would only bring my battery back up to about 80% SOC. I found I had to set the Skybox to run 2 absorb cycles in order to get to 100% SOC. And I was watching charger current and voltage the whole time, and the recommended end amps of 4 amps per battery (12 amps total for my 3 batteries) was never reached. By the time it got to 100% SOC, charge current was about 21 amps.

I don't usually cycle my battery like this, but if I did, seems like using the recommended settings without intervention would never get them back to 100% on a daily basis.

It seems this process is simpler with FLA batteries and an FNDC. What am I missing?
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Mon Jan 13, 2020 6:40 am

I don't use these batteries (yet), but have been studying them for a while now.

TBH, I'm a little perplexed by the seemingly "offhand" guidance from the vendor (and by association, Outback) on charging parameters and state of charge measurements.

One inference I draw from the above, and other reading on Lithium batteries, is they require a change in thinking vis-a-vis Lead Acid.

With Lead Acid, we have been conditioned to reflexively drive a discharged battery to 100% SoC, and that a partial state of charge is bad for battery health.

It would seem Lithium batteries are just the opposite. Driving them to 100% SoC is actually quite stressful for the battery structure, and that a partial SoC condition is better for battery longevity. The widely reported failure of Lithium batteries when the separating membranes are pierced by the growth of crystalline dendrites seems to be exacerbated with charge achieving and being held at 100% SoC.

Secondly, discharging a Lead Acid battery to < 50% SoC is dramatic. Discharging a Lithium battery to < 50% is standard operating procedure.

I wonder if stating Lithium as a "drop in replacement" for Lead Acid is an incorrect notion. Since we are regarding them as LA substitutes, we tend to treat them as if the behave like LA, and IMO that is not the case, or healthy for the battery.

Unfortunately, my opinion is more conjecture than proof, but I think I'd be more comfortable using a Lithium battery between 80%-30% SoC than I would between 100%-50%.

Sorry all I have to offer is my $0.02. I really wish we'd hear the unvarnished lab test results and concise guidance from SimpliPhi (and by association, Outback.)

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Mon Jan 13, 2020 9:02 am

Thanks, Ray. I appreciate your input. I'm about at the same knowledge level as you on these, despite having them in service here.

Fyi, the OB app note for Simpliphi batteries (this note written for pre-Skybox charger setups with FNDC's) says this, in part:
OutBack Inverter and Charge Controller Setup Procedure The SimpliPhi batteries have a very fast current drop-off* when the Absorb voltage target is met. This can be problematic, as when the SimipliPhi batteries are full, the current drops to nearly zero. This is unlike a lead acid battery where the end amps are typically 2-3% of the battery Ah rating and never drop to zero. Under these lightly loaded conditions, the OutBack charging devices cannot regulate as well, causing voltage fluctuations that may rise above the limit of the SimpliPhi input overvoltage protection circuit and shutdown the battery. If the charge voltage creeps up to the SimpliPhi input protection voltage (~60-62 volts), then the Charge Termination Control function can be implemented to end the charge cycle, and prevent the open circuit charging voltages to wander above the SimpliPhi input protection voltage. The settings used by Charge Termination Control are listed under the FN-DC setup on page 5.
While I was watching the tail end of the second absorb cycle last night, *I never saw the very fast current drop-off the note describes, so I'm pretty sure I haven't overcharged the battery.

The other thing I've read about these batteries is that voltage is the best indicator of SOC, which runs counter to yours and my experience. I'm just wondering if the Skybox coulomb counter can (or should) be discounted, or what? Based on kwh consumed in charging, I'm pretty sure I put everything back in that got used when SOC dropped to 44%.

Maybe the one hour recommended absorb time needs to be adjusted based on how deeply the Simpliphi battery is being cycled...sorta like "normal" batteries?
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Mon Jan 13, 2020 9:09 am

Ten years from now, folks are going to be amused at the conundrums we "leadites" are wrestling with. For now though, I feel like one of Peukerts slowest students, sitting on the back bench wondering what the heck he's going on about.

The struggle is real.

🤔🤔🤔

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Mon Jan 13, 2020 9:17 am

Mike Curran wrote:
Mon Jan 13, 2020 9:02 am
Thanks, Ray. I appreciate your input. I'm about at the same knowledge level as you on these, despite having them in service here.

Fyi, the OB app note for Simpliphi batteries (this note written for pre-Skybox charger setups with FNDC's) says this, in part:
OutBack Inverter and Charge Controller Setup Procedure The SimpliPhi batteries have a very fast current drop-off* when the Absorb voltage target is met. This can be problematic, as when the SimipliPhi batteries are full, the current drops to nearly zero. This is unlike a lead acid battery where the end amps are typically 2-3% of the battery Ah rating and never drop to zero. Under these lightly loaded conditions, the OutBack charging devices cannot regulate as well, causing voltage fluctuations that may rise above the limit of the SimpliPhi input overvoltage protection circuit and shutdown the battery. If the charge voltage creeps up to the SimpliPhi input protection voltage (~60-62 volts), then the Charge Termination Control function can be implemented to end the charge cycle, and prevent the open circuit charging voltages to wander above the SimpliPhi input protection voltage. The settings used by Charge Termination Control are listed under the FN-DC setup on page 5.
While I was watching the tail end of the second absorb cycle last night, *I never saw the very fast current drop-off the note describes, so I'm pretty sure I haven't overcharged the battery.

The other thing I've read about these batteries is that voltage is the best indicator of SOC, which runs counter to yours and my experience. I'm just wondering if the Skybox coulomb counter can (or should) be discounted, or what? Based on kwh consumed in charging, I'm pretty sure I put everything back in that got used when SOC dropped to 44%.

Maybe the one hour recommended absorb time needs to be adjusted based on how deeply the Simpliphi battery is being cycled...sorta like "normal" batteries?
I wonder if SimpliPhi is sneaking some "idiot proofing" features into their BMS.

I could see a scenario where both the marketeers and the tech support folk whined so loudly about customer complaints, they put a "top limit" current dump into the battery so that overcharge current doesn't trip the battery protection as readily. At the very least, some sort cell "top balancer" that attempts to jam every last electron into the battery while keeping the cells somewhat in line.

That's my Lithium fueled conspiracy theory for today.

I gotta quit taking the stuff. Maybe I'll switch to Adderall.

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Mon Jan 13, 2020 9:23 am

Ten years from now, folks are going to be amused at the conundrums we "leadites" are wrestling with.
Leadite (n.): Somewhere nearer the top edge of the spectrum between Luddite and lithiumite. :grin:
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Mon Jan 13, 2020 10:17 am

Mike Curran wrote:
Mon Jan 13, 2020 9:23 am
Ten years from now, folks are going to be amused at the conundrums we "leadites" are wrestling with.
Leadite (n.): Somewhere nearer the top edge of the spectrum between Luddite and lithiumite. :grin:
HA HA HA!

I'm familiar with Luddite behavior, exhibit Leadite behavior, and do not trust Lithiumite behavior at all.

Photon Kapture
Forum Member
Posts: 13
Joined: Tue Jan 14, 2020 4:54 pm
My RE system: 3.9 Kilowatt (13) Solar World sw300 Array.
Outback Skybox
(3) Simpliphi Lithium Iron Phosphate Batteries (2) 3.5 and (1) 3.8KWH
Location: Schroeder, Minnesota

Re: Skybox SOC reset with Simpliphi batteries

Post by Photon Kapture » Tue Jan 14, 2020 5:25 pm

While I've never checked to see how many amps my Simpliphi's draw at the end of their absorb I have noticed that the Skybox SOC is not always accurate. It does seem to get more accurate over time if I discharge all the way to low battery cut out and then charge back up to full. I've also noticed that Skyboxes coulomb counting of energy into batteries appears to be much more accurate than energy out of the batteries. (Is this possible?) Perhaps this is because i have such a small battery bank?
In addition Skyboxes battery tile often shows resting or .1k when according to my clamp on ammeter it is drawing 3.5 amps (185 or so watts) I think this is where the discrepancy happens. Overall I'm happy with the simpliphi/skybox combo just getting used to watching voltage instead of SOC. That said hoping to see improvements in the SOC readings in a future firmware update.

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Wed Jan 15, 2020 8:24 am

Hi Photon - I'm curious.

1. Are you grid-tied?
2. Assuming you're using a timed absorb charge, what's your max absorb time setting?

What really caused confusion for me in my o.p. is that the Simpliphi voltage range for 100% SOC doesn't seem to match the Skybox's SOC indication. In other words, when battery voltage seemed to indicate the batteries were full, the SOC indication wasn't there yet. Of course, while they're being charged, battery voltage isn't a good indicator of SOC.

As far as the power flow discrepancy goes, looks like the Skybox drops (or just doesn't read out) anything after the tenths digit, or maybe isn't accurate at the low end of the power measurement scale.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

Photon Kapture
Forum Member
Posts: 13
Joined: Tue Jan 14, 2020 4:54 pm
My RE system: 3.9 Kilowatt (13) Solar World sw300 Array.
Outback Skybox
(3) Simpliphi Lithium Iron Phosphate Batteries (2) 3.5 and (1) 3.8KWH
Location: Schroeder, Minnesota

Re: Skybox SOC reset with Simpliphi batteries

Post by Photon Kapture » Wed Jan 15, 2020 5:52 pm

Mike,

1. I am off grid
2. Im using 56v for 10 min absorb. I am using the 3.5 version Simpliphi

Ive not encountered what you are saying about battery voltage indicating full charge but SOC not reading full. My skybox SOC reads 99% when I hit 56 volts and it changes to absorb for 10 min then SOC reads to 100%.
Mike Curran wrote:
Wed Jan 15, 2020 8:24 am
As far as the power flow discrepancy goes, looks like the Skybox drops (or just doesn't read out) anything after the tenths digit, or maybe isn't accurate at the low end of the power measurement scale.
Thats what I was thinking too.

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Wed Jan 15, 2020 6:47 pm

I'm using 56v for 10 min absorb. I am using the 3.5 version Simpliphi 
Wow! Does that 10 minute absorb bring you back to 100% SOC? My experience was that after dropping to 44% SOC, it took 2 hours of absorb at 54.4 volts (Simpliphi 3.8s × 3) to get to 100%. Prior to this, I had it set for 5 minutes per the OB/Simpliphi advice...
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Wed Jan 15, 2020 8:52 pm

Mike Curran wrote:
Wed Jan 15, 2020 6:47 pm
I'm using 56v for 10 min absorb. I am using the 3.5 version Simpliphi 
Wow! Does that 10 minute absorb bring you back to 100% SOC? My experience was that after dropping to 44% SOC, it took 2 hours of absorb at 54.4 volts (Simpliphi 3.8s × 3) to get to 100%. Prior to this, I had it set for 5 minutes per the OB/Simpliphi advice...
Interesting that the respective Absorb voltages of 54.4 and 56 are so far apart.

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Thu Jan 16, 2020 4:38 am

Interesting that the respective Absorb voltages of 54.4 and 56 are so far apart.
The app note for Simpliphi 3.8s
simpliphi_app_note.pdf
(509.48 KiB) Downloaded 135 times
specs 54.4volts for one hour.
Screenshot_20200116-072946_Adobe Acrobat.jpg
. I was using 5 minutes but looks like that's wrong. 56 volts would be for max DOD and minimum battery life.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Thu Jan 16, 2020 7:28 am

Mike Curran wrote:
Thu Jan 16, 2020 4:38 am
Interesting that the respective Absorb voltages of 54.4 and 56 are so far apart.
The app note for Simpliphi 3.8s simpliphi_app_note.pdf specs 54.4volts for one hour. Screenshot_20200116-072946_Adobe Acrobat.jpg. I was using 5 minutes but looks like that's wrong. 56 volts would be for max DOD and minimum battery life.
Yea, I figured the 56V "Absorb" set point was really just a way to run a Bulk-until-Full charge cycle. IMO, the extreme case - 100% DoD, Bulk until Full, to 100% SoC illustrates two life-reducing factors for Lithium - draining 100% and charging 100%. This is the "Wham, Bam, Thank you Ma'am" mode of battery usage.

The long, slow "Absorb" at lower voltage would permit the BMS to perform "Top Balancing" the battery without having the charge be on afterburners. I'd imagine the cycle will still reach 100% SoC, not a good thing in my book, but would be easy to tweak to back the total charge to less - say 95%, and call it better.

Of course, I don't have this battery and 10 years of experience to prove it, so probably don't really know what I'm talking about.

I surely wish someone who did know what they were talking about would talk about it.

Photon Kapture
Forum Member
Posts: 13
Joined: Tue Jan 14, 2020 4:54 pm
My RE system: 3.9 Kilowatt (13) Solar World sw300 Array.
Outback Skybox
(3) Simpliphi Lithium Iron Phosphate Batteries (2) 3.5 and (1) 3.8KWH
Location: Schroeder, Minnesota

Re: Skybox SOC reset with Simpliphi batteries

Post by Photon Kapture » Thu Jan 16, 2020 4:18 pm

Im using the 10k cycles 80% DOD that was in skyboxes battery tile edit drop down menu labeled Simpliphi. I noticed after the last firmware update the name changed to Configuration 1 instead of Simpliphi. The values stayed the same. The 56v absorb for 10 min also happens to be only 4 min longer than the .1hour (6min) that is recommended on the Simpliphi 3.5 outback integration guide. This is under the charge controller recommendations and is different than the inverter recommendations that Mike posted. Since Skybox is both inverter and charge controller I guessed charge controller voltages are what I should use. And this was confirmed in the Simpliphi configuration on skyboxes battery tile edit menu. Its all a guess at this point because I see there are different recommendations between Outback's Simpliphi integration guide, Skyboxes battery menu, and Simpliphi's Outback integration guide. Holy moly that's alot of guides! :grin:
Screen Shot 2020-01-16 at 5.59.28 PM.png

56v for 10 absorb works great for me.

raysun
Forum Emperor
Posts: 3040
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 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: Skybox SOC reset with Simpliphi batteries

Post by raysun » Thu Jan 16, 2020 4:39 pm

"A man with a watch always knows what time it is.
A man with two watches never knows what time it is."

Mike Curran
Forum Emperor
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

Re: Skybox SOC reset with Simpliphi batteries

Post by Mike Curran » Thu Jan 16, 2020 4:57 pm

The 56v absorb for 10 min also happens to be only 4 min longer than the .1hour (6min) that is recommended on the Simpliphi 3.5 outback integration guide.
Photon - Your settings are probably okay (whatever works! \:D/ ) since they're for the 3.5 model battery, sorry I posted the 3.8 specs which obviously don't apply to your system.

I know OB is planning to issue an app note for the Skybox which hopefully will clear up the confusion between the inverter and charger settings that we are currently working with.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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