If you have a noisy fan on a coolbox, inverter, charger, or anything you can slow it down with a 47 ohm 3w resistor in series.
I've just done our compressor coolbox. Other advantages are it's drawing less air in so won't block up as fast and also the fan uses about 75ma instead of 300ma.
I've fitted a 45°c normally open temperature switch across the resistor so if the condenser does get warm the fan will run at full speed.. So far though it's barely warm.
The box is very quiet now
I've just done our compressor coolbox. Other advantages are it's drawing less air in so won't block up as fast and also the fan uses about 75ma instead of 300ma.
I've fitted a 45°c normally open temperature switch across the resistor so if the condenser does get warm the fan will run at full speed.. So far though it's barely warm.
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The box is very quiet now