Absorption charging rate?

[Gene Neill]

I'm in the process of programming my new Victron MPPT controller. The unit's settings call for an absorption voltage, but have no setting for bulk voltage.
My Trojan 24TMX battery charging instructions specify a bulk charge voltage of 14.82V, but doesn't specify an absorption voltage.
Other than calling Trojan in the morning (do these things EVER come up during business hours??) is there an easy answer to my question?
Just use 14.82V for absorption?

 

[dLj]

I always thought bulk and absorption voltage were the same. But I'm no expert for sure...

dj

 

[Stu Jackson]

Yes, don't bother calling. Good luck, nice gear.

 

[John61CT]

Usually there is just one charging voltage setpoint

Bulk is accurately used for the early CC stage, while the charge source is still striving to reach that setpoint.

Absorption for the later CV stage after it has been reached. So best to call the setpoint "Absorb" voltage.

Different vendors use these terms, very confusingly, in non-standard ways, also "boost", finish charge etc.

 

[markwesti]

Sorry can't answer your question , But on the other hand . When I bought our 6V T105's the shop gave me Trojans booklet for their battery's . It covers most of their batts. I keep it on the boat and I'm not there . You can get your own here https://www.trojanbattery.com/
Also I called them once , got through no problem they were helpful .

 

[DayDreamer41]

In Trojan's world, bulk is absorption, many chargers call the first phase or charging (100% current... given her all she's got captain) bulk charging the charger stays in bulk until the battery voltage reaches xx.xx V at which point the charger switches to absorption, voltage regulated charge (bulk voltage in Trojans world), Hope that makes sense.