Victron MPPT 100/50

Rabbit · Jul 11, 2018

Can anyone tell me what the correct preset on a Victron 100/50 is for generic lead-acid batteries (in my case, Deka/Sam's Club golf carts)? How about AGM's, which I may be buying soon? The owner's manual gives good hints, but is poorly written and I'd prefer to be certain.

I don't want to get into custom settings yet-- one baby step at a time...

And... This is my first time. Any other installation hints?

Thanks!

WalkaboutTed · Jul 11, 2018

You need to look at the recommended settings on the product data sheets for your particular battery when you get it..

That being said, with the Victron, I find that I fiddle with it a lot depending on the weather/cloud cover. I just came back from 2 1/2 wks camping in a very small valley with steep hillsides and trees on both sides of the trailer. I would change the settings on the fly and never got below 85%. Generally I would crank up the float voltage to make up for the effectively "shorter" day there.. We didn't get full sun on all the panels until 1100. If you think you might be interested, the Victron battery monitors can give you added knowledge of your system.
Have fun!
Ted

John61CT · Jul 11, 2018

Position 2 is 14.4V

but listed at the low end by Deka for Absorb

I would use custom.

Rabbit · Jul 12, 2018

Thank you both!

I'm trying to learn one step at a time, so for now am sticking with the presets until I know the system is at least making and storing power properly. In a few weeks, when confident and ready, I'll take further steps. And will likely have more questions, too.

Weight · Jul 12, 2018

I found this some time ago. It was posted by Maine Sail, a recognized expert.
The Sam's East Penn made Duracell GC2 is a Deka GC-10 with a Duracell Sticker. The Sam's EGC2 is a Deka GC-15 with a Duracell Sticker.

The recommendations from East Penn, for that battery, in a cycling / off-grid application are. (Note: floats are higher in off-grid than typical golf cart use).

At 12V:

Max Charge Current = 30% or less of Ah capacity (20 hour)

Absorption Voltage = 14.4V - 14.7V
Absorption End Point = Current change over 1 hour period of less than 0.1A
Max Absorption Time = 12 Hours

Float Voltage = 13.8V - 14.1V
Float End Time = No Limit

Equalization = 15.0V to 15.3V
Equalization End Point = Current change over 1 hour period of less than 0.1A
Max Equalization Time = 12 Hours

Temp Compensation = -.018V for every degree °C rise above 25C

Note:

For dock charging you may want to compensate float down to 13.4V to 13.6V the guidance above is for off-grid or deep cycling applications where the batteries are cycled daily.

Stick to the 14.7V end of the absorption range and the batteries will do much better if they are cycled while cruising.
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