Epever MPPT Charge Controller.... No Gel Battery Equalize?

MetalFiberMetalFiber Posts: 12Registered Users ✭✭
Hello everyone. Made a quick video on Epever MPPT Charge Controller. While going through it I realized that Gel batteries do not have to be equalized. Is this true or should I worry that Epever does not have an equalize for Gel Batteries..? Hope someone can help.



  • BB.BB. Posts: 27,227Super Moderators admin
    In general, you do not do elevated voltage (i.e., charge 14.2 volts for GEL or 14.4 volts for AGM typical at room temperature) equalization voltage for GEL/AGM.

    Lead Acid EQ is typically ~16 volts or so.

    "EQ" for GEL and AGM is typically normal absorb voltage (14.2 or 14.4 volts) and held for 2-6 hours or so--That is the "sealed battery" EQ (very mild "over charging").

    Used to be thought that NEVER EQ sealed batteries.... Now, some folks believe 2-6 hours of "EQ" (at nominal charging voltage) every 6 months is better.

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • MetalFiberMetalFiber Posts: 12Registered Users ✭✭
    edited April 17 #3
    Huh....  Ok.  Good to know.  I'm opting for a Victron to help straighten this out.  I'm already thinking Epever to charge my batteries instead of my MPP Solar Hybrid rebranded inverter.  It has many shortfalls.  I knew equalization is high, but my MPP Solar will not achieve that.  I'm not sure my Epever will either, but I'll keep these specs and see if I can program it on USER.  My MPP Solar has limits on user (highest is 29.2V for a 24V setup).  For my 24V I charge at 29.2V as its' bulk charge.  It immediately drops when on Float.  It's Absorb will rise above the 29.2V...but it fluctuates.  It's why I'd rather have something programmable than use the MPP Solar charger built in.  Anyway...many thanks.
  • mike95490mike95490 Posts: 7,564Solar Expert ✭✭✭✭
    edited April 17 #4
    If you can increase the absorb time, to really get the cells gassing a couple times a month, that helps keep batteries healthy too

    Sorry - so deep down, I didn't see the OP
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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  • BB.BB. Posts: 27,227Super Moderators admin
    Remember that MetalFiber started the thread with EQ questions about GEL batteries.... In general (always?) you never want to "gas" them--Excessive gassing "wears out" the catalyst faster and can cause the batteries to vent. With some cell designs (typically US construction more than EU?) the gassing can cause bubbles/voids to form on the surface of the plates and reduce battery capacity (voids are supposed to be "unrecoverable).

    -Bill "not a battery engineer" B.
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • MetalFiberMetalFiber Posts: 12Registered Users ✭✭
    Yes....there's no way to tell on this MPP Rebranded how long the absorb stage is.  At least mine has no way to program absorb.  In fact, there's no way to program Bulk, Absorb or Float...you can only program the voltage levels, but there's not a time parameter you can adjust.  I will be setting up my Epever to User and will try to program the parameters from there.  Unfortunately that means a seperate panel array.  Thanks again.
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