Must pv1800 pro 3kw fan keeps fluctuating in speed, is this a normal thing?

[bungelos95]

newly bought Must pv1800 pro 3kw inverter fan keeps slowing and speeding up every 2 seconds when the load is at 800 and above, is this a normal behaviour for this inverter? Is there a setting that should be corrected?

 

[meetyg]

Sounds a bit strange. My MUST PH1800 PLUS (3kw, 24v) applies the fan speed in a linear fashion according to load. I haven't noticed any fluctuating. But maybe the PRO version has some smarter control, actually controlling the fan speed according to the temperature?

 

[bungelos95]

Thanks for the reply, but could it be an error in the software for this model or a hardware issue? still looking for ideas

 

[meetyg]

Can you monitor the temperature (via SolarpowerMonitor software)?
See if the temperature is also fluctuating.

 

[bungelos95]

Its giving me normal temperature levels, and they are not fluctuating, but i noticed whenever i am using over 2000 watts or below 800 the fans do not fluctuate at all

 

[meetyg]

What kind of loads are you running at or above 800w, when the fans are fluctuating? Could it be an inductive load that's causing these fluctuations in power and hence in fan control?

 

[bungelos95]

If i remember right the fans fluctuate between 800 to 1800 watts