Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1464
| Posted: 10:48pm 07 Jan 2023 |
the "545" in bottom right of the LCD is the PWM width used at that time.
The units are clock cycles, and the max PWM width is 795
With a 20kHz PWM frequency and 16 MHz clock, there is 800 cycles available
for each PWM pulse. We control the width by having the pulse ON for some number
of cycles.
The voltage ratio (Volts Input to Volts Output) is tied very closely to
the PWM width.
In the photo, you have 545 which is 545/800 pulse with or
0.681
The LCD shows Vin = 91.5 and Vout = 54.2
54.2 / 91.5 = 0.592
This is close enough and it suggests there are losses large enough to look at reducing them or maybe the Volts calibration is a bit off.
here are my 2 from today at 9:45am :
East facing array
North array
Finally, the "---" is where it shows how long it has been in either float,absorb or equalisation mode. If it's in mppt mode (i.e. battery voltage not up high enough)
then it shows "---"
The number is minutes.