Classic Manual Rev L
40 | P a g e 1 0 - 0 0 1 - 1 R E V L
AUX Function Definitions
VOLTS: Refers to the voltage threshold, or set point, or “At what voltage do you want to turn
on/off the specified AUX port?”
DELAY: Time in seconds the Classic will wait to turn AUX 1 on/off once the set point is
reached.
HOLD: Time in seconds that the Classic will wait to turn AUX 1on/off once set point is
reached.
NOTE: DELAY is at the beginning, HOLD is at the end. For example, if AUX 1 is OFF and
the set point voltage is reached, when AUX 1 turns ON, DELAY will be the number of
seconds before it actually turns ON, and HOLD will be the number of seconds before it
turns fully OFF. The inverse can occur too. If AUX 1 is ON, DELAY is the amount of time
before it changes state (to OFF), and HOLD is the amount of time before AUX 1 turns back
ON. Another way to explain … HOLD and DELAY is the amount of time the Classic must
wait after the target set point voltage is reached before changing the state of AUX 1.
NOTE: 1) DELAY helps prevent premature reconnects due to voltage spikes. 2) HOLD
helps to avoid nuisance disconnecting of the loads due to momentary voltage sags.
DAWN: Point in time when your PV voltage reaches the same as battery voltage. This is not a
time factor.
Example: The sun starts coming up and the light hits your panels. The voltage starts to
climb and when it hits the same voltage as your batteries the Classic will mark this as
DAWN.
DUSK: Point in time when your PV voltage falls below your battery voltage, the Classic will
mark this as DUSK. This is not a time factor.
WIDTH: Is the voltage range (usually 1.0V) above or below the target set point, depending
on active high or active low, that the PWM goes from full OFF to full ON. The Classic has a
voltage resolution of 0.1V. A WIDTH setting of 1.0V therefore is divided into 10 different
PWM possibilities. Every 0.1V, the PWM gets a bit wider or narrower depending on if the
voltage is going up or down and if it is active high or active low. 0% PWM is OFF all the time
… 100% PWM is ON all the time … 50% PWM is OFF half the time and ON the other half of the
time. The AUX 2 PWM operates at 500Hz, or at 2 milliseconds (1/500 = 2 ms). So, 50% PWM
would be ON for 1 ms and OFF for 1 ms.
Example:
1. 55V is your threshold, or set point, or target voltage …
2. If battery voltage is below 55V and the WIDTH is 1.0V …
a. The PWM is at 0%
3. When the battery voltage reaches 55.1V …
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