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  • Absorb Time

    Just curious if the classic registers 100% SOC how long should it stay in Absorb after that point? or does it matter? The batteries I have are sealed lead acid and the battery manufactures sheet says it should be charged to 1.2 which I'm guessing it 120%.

  • #2
    Absorb is not a timed event and takes from 6 to 12 hours to fully saturate a FLA or AGM battery. Absorb Termination is a measure of charge current decay while in a Constant Voltage mode. Absorb Voltage is applied to the battery until Charge Current Tapers off to 1 to 3% oc C. So if that were a 100 AH battery keep charging until current tapers down to 1 to 3 amps some 6 to 12 hours later.

    So your takeaway here is you max out Absorb time, and set voltage as high as you can like 14.9 volts. Even then it still may not be fully charged because you ran out of Sun. Monitor with Hydrometer, if they ever register 100%, you can back the voltage off a bit and see what happens. Hopefully you find a voltage that can get you mostly charged up.

    Forget the SOC meter in the controller. It does not know what it is talking about. You cannot use voltage to determine SOC on a working system.
    Last edited by Sunking; 08-08-2017, 11:08 PM.
    MSEE, PE

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    • #3
      to provide charge termination, the Classic uses the Whiz-Bang and a Shunt to measure end amps. The shunt goes in the Battery Lead, so only battery current is measured, Don't run Loads thru the shunt, it will fool the measurement and over charge your batteries.
      Powerfab top of pole PV mount (2) | 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 ||
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