Owner's Guide

The charge controller transitions to the float stage if either of the following two conditions
are met:
n The charge current into the batteries falls below the exit current threshold, which is
equal to 2% of the programmed battery capacity (for a 500 amp- hour battery bank, this
would be 10 amps), for one minute.
n The charge controller has been in absorption for the programmed maximum absorption
time limit. The default is three hours, but the time limit is programmable from one
minute to eight hours.
Float Stage
During the float stage, the voltage of the battery is held at the float voltage setting. Full
current can be provided to the loads connected to the battery during the float stage from
the PV array. When battery voltage drops below the recharge voltage setting for one
minute, a new bulk cycle is automatically initiated.
Figure 2Three-stage Battery Charging Cycle
NOTE:
n When the charge cycle is interrupted, the charge controller will resume charging at the
beginning of the multi-stage algorithm.
n The exit current threshold mechanism can be disabled by setting the amp-hour
capacity to 0. In this case, absorption will only exit when the absorption timer expires.
n Charge current during the equalize state (an optional state not shown in the figures) is
normally limited to a maximum of 10% of the programmed amp-hour capacity setting.
If this setting is programmed to 0 Ah, the charge current during equalize is limited to
Introduction Conext MPPT 80 and Conext MPPT 100 Owner’s Guide
990-6214 This document is for use by qualified personnel 24