DIY Manual

51 | P a g e 10-543-1 REV A
DIY Manual
EQ (Equalization)
EQ is a maintenance mode to equalize flooded lead-acid batteries, and some sealed batteries
(Check with battery manufacturer if you have AGM or GEL batteries). EQ is a high voltage setting
which basically boils the battery’s electrolyte solution, to remove sulfates that are attached to
the battery’s lead plates.
Advanced
Ending Amps – Used in conjunction with the MidNite Whiz Bang Jr current-sensing device. Ending
amps is set by the battery manufacturer and means the point at which the battery bank is full.
During the Absorb charge cycle, the charge controller holds the voltage at the preset charge level,
say 14.8V. As the batteries fill up, the current into the batteries decreases. When the decreasing
current reaches the preset End Amps point, the charge controller stops the Absorb cycle and
transitions to Float. In the absence of specifications from your battery manufacturer, you can
use 1 – 3% of the total bank amp-hour capacity for the ending amps.
Re-bulk – Forces Classic back in to the Bulk charge cycle. Helpful if your inverter runs during the
day, bank gets depleted, and enough sunlight hours remain to recharge the battery bank. Good
re-bulk setting is your bank’s 50% DOD voltage point (12.1V; 24.2V; or 48.4V). Or you can just
let the Classic stay in Float, and the Classic will sense the current outflow and change to Float
MPPT.
Re-bulk is useful for Lithium batteries as a “stop charge” mechanism.
EXAMPLE:
1. You want the Classic to charge when the battery’s voltage is less than 51.9V and rest when
at 52V.
a. Set Absorb volts = 52V
b. Set Absorb time = 3 minutes.
12V battery = 6 cells; 24V battery = 12 cells; 36V battery = 18 cells; 48V battery = 24 cells
EQ Dos & Don’ts
• Ensure electrolyte solution is full before EQ.
• Check electrolyte solution after EQ.
• During EQ, your inverter may alarm with an over-
voltage condition.
Turn it off before EQ.