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Originally Posted by pauldenton
hmm - i wonder what is the affect on the pump (long term) of using PWM rather than reducing the voltage....
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very good question
no definitive answer, but a clue
start/stop cycles cause greater wear than continuous use, but PWM effective slows the pump, rather than discrete stop/start cycles
reduced voltage applies the reduction continuously
I'd prefer voltage reduction, but not sure there is a difference
I will investigate