SETTINGS ON MATE 3 FOR GEL BATTERIES

Discussion about the OutBack Energy Cell Batteries
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darien
Forum Member
Posts: 6
Joined: Mon Jan 29, 2018 4:24 pm
My RE system: (2) Inverters VFXR3648A as Backup
MATE 3
HUB 10.3
Battery Bank 265AH

SETTINGS ON MATE 3 FOR GEL BATTERIES

Post by darien » Tue Feb 06, 2018 5:12 pm

Hi,
I have 4 GEL 12v batteries (Deka 8G8D) for VFXR Inverter 48v. But I don't know if my settings are correct. Anyone can help me?

Battery Charger settings that I have.
Absorb Voltaje 56.4 VDC Time 2hrs
Float Voltage 53.6 VDC Time 2hrs
Re-Float Voltage 52.0 VDC
Re-Bulk Voltage 48.0 VDC

I have 2 inverters three phase stacking configuration (because my source is 120/208).
This attachment is the data sheet battery.
Screen Shot 2018-02-06 at 7.52.41 PM.png

Mike Curran
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My RE system: Outback - Garage roof:
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- 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
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* waiting for firmware update from OB

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

Re: SETTINGS ON MATE 3 FOR GEL BATTERIES

Post by Mike Curran » Tue Feb 06, 2018 9:02 pm

Hey Darien - Those settings look good, your float and absorb voltages are at the bottom end of Deka's recommended range but probably okay. Float time could be anything, 2 hours will work but if this is just a backup system and you want your battery to be ready for an outage then maybe you want to set your float time longer, although you will be paying for the constant float charge current. Another approach would be to increase your refloat voltage to 53V, that'll keep your battery voltage in a "ready" state (always above 53V as long as grid is available) without keeping a 24/7 float charge on it.

They specify absorb time as "charge until change in current less than 0.1A/hour" so you will have to experiment to see how long it takes. Note max is given as 12 hours, you shouldn't even come close to that unless your batteries are in a pretty low state of charge. I would say start with 4 hours, you can always stop it if you reach "absorption" (no more charge being accepted) sooner.

In a backup system you won't see absorb stage unless you drain your battery down below the "rebulk" voltage setpoint (which looks okay, btw). But you'll probably want to do a manual absorb cycle on a regular basis just to keep your battery from sulfation that results from just sitting at float for prolonged periods. For one of these manual absorb cycles, absorb time should be shorter since your battery hasn't been discharged fully (it's been sitting at float).

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

darien
Forum Member
Posts: 6
Joined: Mon Jan 29, 2018 4:24 pm
My RE system: (2) Inverters VFXR3648A as Backup
MATE 3
HUB 10.3
Battery Bank 265AH

Re: SETTINGS ON MATE 3 FOR GEL BATTERIES

Post by darien » Wed Feb 07, 2018 4:26 am

I appreciate your time, thanks a lot. It was a great help.

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