mppt vs pwm

Salvo wrote:
I don't believe that's the case. When in bulk mode, there's no pwm action. The panel should be shorted to the battery.

MrWizard wrote:
Don
Pulse width modulated, means the power is modulated all the time
It's a a high frequency pulse in the dc current, used to stimulate the plates to accept charge and remove sulfation
Doesn't matter wether it's in bulk or float

if that was the case
the output to the battery would be the same voltage as the input to the controller, NOT a desirable situation at peak summer voltage

do you know where PWM originated or Why
it originated with machinery controls for motor speed
to precisely control motors , i was working with this technology 40 years go to precisely control the speed of huge motors with 3 phase windings in industrial milling machinery making aerospace and ordinance parts
( it probably originated with controlling the speed of the motors driving, nuclear submarines )

it has been adapted to voltage control of solar chargers