WM EverStart 27DC

as for "Wet" storage batteries. Johnson Control and Walmart does the same thing. Lowest bidder.

mvas wrote:

#1 Bulk Constant Current = 8 amps until 14.4 volts
#2 Absorb Constant Voltage = 14.4 volts until 2 amps
#3 Finish Constant Current = 2 amps until 15.3 volts
#4 Float Constant Voltage = 13.0 volts forever.

Those numbers are perfect for any wet cell. Only thing to improve is to have temperature compensation.

What charging system actually produces that profile?

Your batteies are about 95 Amp Hour at the C/20 rate, Max charge current is thus around 31-32 amps. If you need voltages you can looke 'em up on most programmable Charger manuals as "Generic Maintenance Free.

Everstart is a poor choice for a house battery, though there are worse ones.

Reason: Too many bucks, not enough bang.

My label states "Distributed by: Johnson Controls Battery Group, Inc".
Is JCI the manufacturer or just a distributor?

OK, I will look for "bubbles" when the Finish Stage hits 15.3 volts.
Usually, the Finish Stage (@ 2 amps) takes about 1 hour to go from 14.4 volts to 15.3 volts.
If I do not see bubbles, then I will HOLD the Finish Stage at 15.3 Volts until I see bubbles.

#1 Bulk Constant Current = 8 amps until 14.4 volts
#2 Absorb Constant Voltage = 14.4 volts until 2 amps
#3 Finish Constant Current = 2 amps until 15.3 volts
#4 Float Constant Voltage = 13.0 volts (forever at home)

If I can get 300 cycles, then that is only $0.30 per cycle.
That is a great value for a WM 27DC battery.

Why doesn't the WM / JCI website provide the proper 3-stage recharge values for their Deep Cycle batteries, like US Battery and most other manufacturers do?

I see that you recommend 60 percent SOC remaining. I use about 30 Amp-Hours each night. That is perfect, because that means I am using about 40 percent of the 90 Amp-Hours C/20 rating. I have never used 50 percent. So far, the battery has been functioning perfectly for 18 months.

The RRC, Repetitive Reserve Capacity, rating is only 65 CYCLES! But I already have 100 CYCLES @ 40 percent DOD, in just 18 months. My goal is to get, at least 200+ cycles over a 3 - 4 year period.

The only information on my 27DC battery is: "109 AH @ 1 Amp".
Yesterday, at WM, I saw: "80 AH at 20 Amps" on the new 27DC batteries!
If true, then the C 20Hr rating of my WM 27DC is somewhere, in between those two values?
Maybe, 90AH @ 4.5 Amps C 20Hr rated battery?

_ 109 AH @ 1.0 Amps = C 109Hr (old label)
__ 90 AH @ 4.5 Amps = C 20Hr ???
__ 80 AH @ 20. Amps = C 4Hr (new label)

RE: ABSORB VOLTAGE ...
At 80 Degrees, the Absorb Voltage is 14.4 volts
At 70 Degrees, the Absorb Voltage is 14.5 Volts

Yes, I can increase the Absorb Voltage.
What Absorb Voltage do you recommend?

How many 40% DOD /60% SOC Cycles do you think I will get?

IMHO nothing wrong with those numbers for a rig that does not endure off grid camping longer than a week (more or less). For entended generator camping 14.8 volts should persist until the batteries start bubbling lightly then defeat to float. Your numbers would require a generator to run 9-12 hours to get a full charge.

Your battery is a hybrid 2-3/4% antimony / calcium negative plate unit. I would limit max discharge to 60% remaining. Drawing deeper causes charge rejection. JC likes power pedestals. The hybrid demands a higher absorbsion voltage limit. Ypur charger algorithim is very light on permitted absorbsion. Is there any way to reboot the charger protocol? Tjat would make things easier.

I am looking for WM EverStart / JCI 27DC charging values.

I am currently using the US Battery 27DC XC2 values
because that is all that I could find.

I do not think the US 27DC XC2 is the same battery as WM EverStart 27DC.

Mvas,

What is your question?
All you numbers are acceptable.

Matt