The purpose of doing a manual bulk or equalize charge

Mate3 and Mate3s communications devices for Outback Power
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pioneerMan
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My RE system: 12 volt system
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Trimetric 2030A battery monitor
Mate 3d
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Location: Northern Utah

The purpose of doing a manual bulk or equalize charge

Post by pioneerMan »

I'm still getting to know my new Mate 3s. One thing that has been confusing for me is the purpose of the options for manually starting a bulk or equalize charge. If the Mate is supposed to monitor voltage and then start the generator on it's own, what would be a good reason for ever needing to start these two types of charges manually?

Forgive my ignorance.
raysun
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My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
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Honda EU7000is gas fuel generator

Re: The purpose of doing a manual bulk or equalize charge

Post by raysun »

Not everyone uses AGS.

Also, the logic that controls whether the inverter chargers will actually execute a charge cycle the next time the units are in charger mode is quite complex. Often, the charge cycle state runs orthogonal to the wishes of the operator, so the manual Bulk Start and EQ Start functions override the internal status, reset all the charging cycle flags, and unconditionally execute a charge cycle.
Mike Curran
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Re: The purpose of doing a manual bulk or equalize charge

Post by Mike Curran »

Screenshot_20210321-201317_Samsung Internet.jpg
Had to look that up, my trig vocab is a little rusty.
https://smart.tigoenergy.com/p/pZXn7SZQyO45?date=2021-04-19
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
pss
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Re: The purpose of doing a manual bulk or equalize charge

Post by pss »

An equalization charge is a constant voltage charge held for a period of time as specified by the battery manufacturer. The equalization voltage is above that of the bulk or absorb charge settings for the charge controllers or inverter charger. The actual purpose is to "equalize" the voltage of each individual cell within a flooded battery. For example, if your battery absorb charge is 2.44 volts per cell for a 3 cell 6 volt FLA battery, you may find over time that when you complete your charge cycle, one cell is 2.44, the second is 2.42 and the third 2.40. The cells no longer possess the same strength of function when charged. By holding the cells for a period of time in excess of their absorb/bulk charge voltage, the 2.44 cell hits 2.44, and over the equalization time, the contents of the battery will boil and gas and the chemistry mix up enough so that the second cell will get to 2.44 and the third cell will get to 2.44, thus all 3 cells will now be equal in voltage.

In practice, it is not really possible to equalize the battery with PV since clouds and other factors may prevent a steady high voltage from being supplied over the equalization time period.
So you set your inverter's charger to the proper equalization time and voltage and then when the batteries are at or very close to fully charged and the water levels are at proper height, run an equalization charge manually that will hold the voltage properly for the designated time period.

In my case, I am not using the batteries much in the winter so they stay basically 99% charged all the time. Every 2 weeks I run a manual 3 hour equalization charge to give them a good gassing and mix things up. Of course, checking specific gravity of the cells is also important to make sure none are damaged. This helps prevent sulfation of the plates too.
raysun
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Posts: 4624
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: The purpose of doing a manual bulk or equalize charge

Post by raysun »

Mike Curran wrote: Sun Mar 21, 2021 5:14 pm Screenshot_20210321-201317_Samsung Internet.jpgHad to look that up, my trig vocab is a little rusty.
LOL!

I randomly flip open my Big Book of Words Nobody Uses, and insert one into daily conversation.
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