Frequently Asked Question
CLASSIC - AUX2 Clipper Mode Volt & Width explained
Last Updated 6 years ago
At some point, the Classic will go from MPPT mode to Absorb or Float.
What was the INPUT source voltage that this occurred at ? At this point, the input voltage needs to rise to reduce the output current to the battery. The Classic remembers that exact voltage. So, this typical but adjustable headroom voltage allows the clipper to clip at that amount of voltage ABOVE that voltage where the Classic went to Absorb or Float or EQ. (constant battery voltage)
As soon as the input source (wind turbine in this case) dies down, the Classic will usually go back to MPPT mode at which time the absolute input voltage reference will not be good anymore. But the Classic keeps an eye on the input voltage and next time the battery needs to go into constant voltage battery mode (Absorb, Float, EQ), again, that headroom voltage will come back into play again. With default setting, if the input voltage at which it came out of MPPT mode was 100V, then the clipper would start clipping at 105 volts input.
The width adjust amount is the input voltage at which the Classic PWM at AUX 2 will go from full off to full on. At 105 V input (100V + 5V) it would just start to PWM on at 105 (or is it 104?) volts and be full on at 106V (or is that 105 volts?)
If the WIDTH was set at 5V, then it would start PWMing at around 105 volts input and be full on at around 110V input.
What was the INPUT source voltage that this occurred at ? At this point, the input voltage needs to rise to reduce the output current to the battery. The Classic remembers that exact voltage. So, this typical but adjustable headroom voltage allows the clipper to clip at that amount of voltage ABOVE that voltage where the Classic went to Absorb or Float or EQ. (constant battery voltage)
As soon as the input source (wind turbine in this case) dies down, the Classic will usually go back to MPPT mode at which time the absolute input voltage reference will not be good anymore. But the Classic keeps an eye on the input voltage and next time the battery needs to go into constant voltage battery mode (Absorb, Float, EQ), again, that headroom voltage will come back into play again. With default setting, if the input voltage at which it came out of MPPT mode was 100V, then the clipper would start clipping at 105 volts input.
The width adjust amount is the input voltage at which the Classic PWM at AUX 2 will go from full off to full on. At 105 V input (100V + 5V) it would just start to PWM on at 105 (or is it 104?) volts and be full on at 106V (or is that 105 volts?)
If the WIDTH was set at 5V, then it would start PWMing at around 105 volts input and be full on at around 110V input.