Hyper2283

Hi! Yes, I fixed it! I studied the schematic after I opened the inverter. It is a 12 V source, and on its output it has a mosfet, switched at a frequency of 6khz(to low) , with a duty cycle that varies between 20-30%, causing this strange behavior of the fans. The 12 V voltage is perfectly stable in the load, but the control on the mosfet gate is the problem. I solved it by adding a 470uF capacitor in parallel with one of the fans(red is pozitive, black is negative) , they are all in parallel, thus filtering the voltage to a clean 12 V. Now the fans start normally, and stop normally when the temperature requirements are met. Since mosfet is switching GND, capacitor reactance is not affecting 12V power consumption.
I hope that this easy fix will help a lot of owners, and bonus....will not void your warranty, since you don't have to open inverter case and just take one fan out and install capacitor on first fan conector.
Beste regards!

Hi! Yes, I fixed it! I studied the schematic after I opened the inverter. It is a 12 V source, and on its output it has a mosfet, switched at a frequency of 6khz(to low) , with a duty cycle that varies between 20-30%, causing this strange behavior of the fans. The 12 V voltage is perfectly stable in the load, but the control on the mosfet gate is the problem. I solved it by adding a 470uF capacitor in parallel with one of the fans(red is pozitive, black is negative) , they are all in parallel, thus filtering the voltage to a clean 12 V. Now the fans start normally, and stop normally when the temperature requirements are met. Since mosfet is switching GND, capacitor reactance is not affecting 12V power consumption.
I hope that this easy fix will help a lot of owners, and bonus....will not void your warranty, since you don't have to open inverter case and just take one fan out and install capacitor on first fan conector.
Beste regards!