mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
The "PWM" controller does nothing in Bulk, but the MPPT controller does.
I will try to find that ASC explanation again for "low frequency PWM"
It is very confusing to separate the different actions. It does switch the panel on and off. It somehow is able to time the periods (durations) of on and off to reduce the time on and increase the time off as battery SOC rises, while the Vabs is maintained.
These "durations" are here called "pulses" and since they change duration that can be seen as a form of "pulse width (or "length") modification"
The rapidity of the pulses is called "pulse repetition rate" but that is not the "frequency" which is the cycles in the actual pulse if it were radar, say.
But here with "low frequency PWM" they seem to be talking about the pulse repetition rate, as the "frequency" not the frequency (hertz) of the "pulse".
"CHARGING METHOD: Low Frequency Pulse Width Modulation : - The ASC
provides pulses of charging current at varying durations to maintain the batteries at
a full state of charge and insure the long-term health on the batteries. The “on” and
“off” cycle time is wide enough to eliminate electronic noise and short enough to
insure the batteries are always topped off. This method allows the batteries to
reach a higher voltage with the “on” cycle and protect the batteries from gassing in
the “off” cycle. This will provide the benefits of the higher voltage (reduced
sulfation and stirred up electrolyte) and prevent excessive gassing and excessive
water loss."
Scroll down to page 12 of 24 "Operation"
http://www.specialtyconcepts.com/SPECIALTY_CONCEPTS_PDF_FILES/ASC_INSTRUC_MANUAL.PDF
I will try to find that ASC explanation again for "low frequency PWM"
It is very confusing to separate the different actions. It does switch the panel on and off. It somehow is able to time the periods (durations) of on and off to reduce the time on and increase the time off as battery SOC rises, while the Vabs is maintained.
These "durations" are here called "pulses" and since they change duration that can be seen as a form of "pulse width (or "length") modification"
The rapidity of the pulses is called "pulse repetition rate" but that is not the "frequency" which is the cycles in the actual pulse if it were radar, say.
But here with "low frequency PWM" they seem to be talking about the pulse repetition rate, as the "frequency" not the frequency (hertz) of the "pulse".
"CHARGING METHOD: Low Frequency Pulse Width Modulation : - The ASC
provides pulses of charging current at varying durations to maintain the batteries at
a full state of charge and insure the long-term health on the batteries. The “on” and
“off” cycle time is wide enough to eliminate electronic noise and short enough to
insure the batteries are always topped off. This method allows the batteries to
reach a higher voltage with the “on” cycle and protect the batteries from gassing in
the “off” cycle. This will provide the benefits of the higher voltage (reduced
sulfation and stirred up electrolyte) and prevent excessive gassing and excessive
water loss."
Scroll down to page 12 of 24 "Operation"
http://www.specialtyconcepts.com/SPECIALTY_CONCEPTS_PDF_FILES/ASC_INSTRUC_MANUAL.PDF
