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Solar charge controller setpoints

Controller behavior is guided by setpoints, or values stored internally. On simpler controllers the setpoints may not be adjustable. On others there is a range of values that can be stored.

charging setpoints

  • Float voltage (Vfloat) - the voltage the battery bank is held at during Float. Common setpoint in most configurable controllers.
  • Absorption voltage (Vabs) - the voltage the battery bank is held at during Absorption. Common.
  • Absorption duration - the amount of time Vabs will be held until dropping to Vfloat. Somewhat common.
  • Absorption termination - the amount of current (or percentage of capacity) Absorption must fall to before dropping to Vfloat. Not common.
  • Absorption restart - voltage (or duration) at which Absorption stage after failing to maintain Vfloat

load setpoints

Only present on controllers with LOAD outputs.

  • Low voltage disconnect (Vlvd) - voltage at which the controller turns off loads to prevent excessive battery discharge. Typically something like 12.1v (the voltage at 50% depth of discharge). Heavier loads that cause voltage sag may require setting a lower Vlvd so the voltage pops back up to 12.1v1) when the load is removed.
  • Low voltage reconnect (Vlvr) - the setpoint at which the load is turned back on after recovering from Vlvd cutoff. Vlvr > Vlvd. If Vlvr is set too close to Vlvd the loads may continually toggle on/off.

other setpoints


1) or whatever
electrical/solar/charge_controller_setpoints.txt · Last modified: 2017/10/26 18:47 by frater_secessus