Frequently Asked Question

CLASSIC - ENDAMPS - How do I figure what ENDAMPS should be?
Last Updated 6 years ago

Lets first tell you what ENDAMPS is...
ENDAMPS is the current the Lead-Acid type battery will "draw" from the charging source when it is 100% charged and can take no more charge.  It is this point if the current is not reduced the battery electrolyte and the battery will heat up.  Too much and things can get ugly very fast.

The Classic has the ability to terminate the Absorb cycle using Whizbang JR as the ENDAMPS source.  For this to work most systems will require a SHUNT and the WBjr option.  The WBjr is a current measuring option for the Classic and KID charge controllers.  It sends data on the amps in or out of the battery, it is important for things to work to have this and the shunt installed properly.

How to figure what YOUR battery needs for ENDAMPS.
First. lets look at what effects ENDAMPS.
#1 - Battery age
#2 - Battery condition
#3 - Battery type (Flooded, GEL, AGM, other)
#4 - Some battery manufacturers have this number for you, but be warned, for a NEW battery

The Best way to figure out YOUR Battery ENDAMPS is this way:
Take a day, turn off all LOADS while testing for ENDAMPS.
Set ABSORB TIME to something high, like 8 hours.
Remember what your time was, write it down.
Let the Classic (or KID) get to absorb, then come back after the time your wrote down has passed.
Lets say default 2 hours you are back.
Get a notebook, mark off lines every 10 minutes for about 2 hours, 12 lines like this:
:10
:20
:30
:40... and so on.

Go to the WBjr page, 3rd page on the STATUS BUTTON and watch the amps.
They should be a positive number between 1 and 20 amps or so, depends on your battery total Ah rating.

Write down the AMPS every 10 minutes for 2 hours.

You should see a point where the AMPS do not drop any further, your ENDAMP setting will be this number plus maybe 1/2 or 1 amp.

You should set your absorb time to be only about a hour longer that normal.  ENDAMPS will drop the Classic to FLOAT at exactly the setting you put in.  If everything is right, your battery will always go to float at 100% SOC.

You may need to do this every 6 months to a year as your batteries age.

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