Alltrax DCX 400 Settings

[chasenfish16]

Thank you to everyone, this info has been very informative.

[porthole]

Originally Posted by scottyb

Alltrax sets under voltage at 20v. I disagree. I set it to 27vdc for 36v operating systems and 37vdc for 48v systems. I never want my batteries drawn down any lower than this under any circumstances. Factory throttle setting is 5 up and down.
I hope this helps

What do these setting accomplish? If the set voltage is 27 and drops below that does the cart shut off?

[chasenfish16]

I understand 27 volts is the number for setting the undervoltage, what is a good number for the overvoltage setting for a 36 volt setup on a ALlltrax DCS 400

[scottyb]

Hot off the charger would b 44v

[chasenfish16]

so set the overvoltage at 44? or a bit higher?

[JohnnieB]

Originally Posted by chasenfish16

so set the overvoltage at 44? or a bit higher?

Absolute minimum Under Voltage setting = 1.5VPC (Volts per Cell). Which is 27.0V for a 36V pack (18 cells).
Loading lead-acid wet-cell deep-cycle batteries below 1.5VPC will cause irreversible physical damage to the lead plates inside the battery.

Over Voltage setting isn't even remotely as absolute as the Under Voltage setting.
44V is probably high enough if your maximum On-Charge voltage doesn't exceed 44V and you don't use Regen Braking.

The "fully charged" On-Charge voltages given on Trojan's Recommended Charging Profile (attached) are in the 2.45VPC to 2.79VPC range, or 44.1V to 50.22V for a 36V battery pack, so I'd set the Over Voltage in the lower end of that range if Regen Braking wasn't used and the higher end if it was used.

FWIW-1: The Over Voltage setting on a stock PDS controller is about 48V. See beep code 2-2 on attached label that is on the PDS controller cover.

FWIW-2: My DCX400, which will be running at 42V with Regen Braking, will be set to about 1.55VPC for Under Voltage and about 2.80VPC for Over Voltage. If need be, I'll go higher on the Over Voltage setting.

Hope this helps.

[chasenfish16]

so its sounds like 28 and 50 volts should do the trick for a 36 volt system if my fuzzy math is correct.

[chasenfish16]

my only question is will a battery ever drop below 4.65 volts at any time if it is kept above 50% charge when climbing a steep hill with a jacked up cart 22 inch tires 3 people and a back seat.

[JohnnieB]

Originally Posted by chasenfish16

my only question is will a battery ever drop below 4.65 volts at any time if it is kept above 50% charge when climbing a steep hill with a jacked up cart 22 inch tires 3 people and a back seat.

It depends on the angle of the incline, the length of the incline, how much the 3 people weigh, the Amp-Hour rating of the batteries, the age of the batteries and some other factors, but it is a possibility.

If it does happen, the battery's Amp-Hour rating is far too low for the way the cart is set up and being used, or the batteries have exceeded their useful life.

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Setting the Under Voltage to 1.5VPC (or slightly higher) is building a brick wall to protect the batteries and the controller from damage.
During normal cart usage, the batteries shouldn't be routinely loaded down lower than 1.75VPC. (5.25V for a 6V battery)

FWIW: 1.75VPC is the loading battery manufacturers typically use for non-destructive load testing of their products.

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Install a DVM type battery meter in the dash and keep an eye on it while climbing that steep hill with three souls on-board.
If it is dropping below 1.75VPC (31.5V for a 36V pack), it is time to start thinking about newer batteries and/or larger capacity batteries and/or more of them.

[chasenfish16]

First of all I would like to thank JohnnieB and ScottyB and everyone else that has helped in this discussion.

I have just installed 6 new US battery US 2200xc2 in the cart and they are 232 ah rated batteiries. I am just trying to protect my investment but not be stranded in the woods by setting my undervoltage too low.
I am going to try to set my under voltage at 28 volts this would keep it slightly above the 1.5 vpc.

Please answer a question for me Jonhnie in your last statement batteries should not be loaded down routinely lower then 5.25 volts. that shows up to me as 10% on the state of charge sheet. I keep reading that i should not discharge my batteries below 50% please clarify this for me. I am just trying to learn how to get the most out of my batteries but not kill my run time.