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SETTINGS ON MATE 3 FOR GEL BATTERIES

Posted: Tue Feb 06, 2018 4:12 pm
by darien
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

Re: SETTINGS ON MATE 3 FOR GEL BATTERIES

Posted: Tue Feb 06, 2018 8:02 pm
by Mike Curran
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

Re: SETTINGS ON MATE 3 FOR GEL BATTERIES

Posted: Wed Feb 07, 2018 3:26 am
by darien
I appreciate your time, thanks a lot. It was a great help.