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Growatt Noise fix anyone?

A

Arne999

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Sep 26, 2022
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I have just got my Growatt 3000 24V running but the noise from the fans are killing me.... I have searched the web and im not alone but I cant find anyone who have "fixed it"

For starters...when everything is "off" (no PV no charging) the noise from the fans are louder than any computer I have ever used. There cant be much need for cooling at this point..
Then when the power kiks in (regardless of 100W or 2kW) the fans go into turbomode. ...

I have my unit placed in the basement. Usually max max 16degC even during summer time. I guess the fans arent temperatrure controlled?

I have lot of space so to do some big fan (lower speed) thing but there will be a lot of trial and error so if someone have done something smart it would be nice to copy paste that solution.
 
Just installed my growatt spf 5000 es... the noise is too much, i hope a solution would be provided soon.
 
I've just replaced the fans in my SPF unit with some high quality 4-wire "silent" 80mm PC fans. Some minor rewiring was required as the plugs are different, however my unit has gone from an every day annoyance to something I can hardly hear now.

The original fans from Growatt were very high performance units (about 8W each), I replaced them with fans less than half the power.
Prior to this I'd been logging data from the 3 temperature sensors inside the unit, and made a comparison after the fans were replaced. Previously the hottest point in the unit, the buck converter temperature sensor, registered about 40°C while under peak load. It now reads 48°C with the same load and ambient temperature, a very acceptable difference given the massive drop in noise.

One thing I did notice while replacing the fans is that the inverter chassis only has a couple small perforated windows at the top for the hot air to exit. This limits the total airflow considerably - while the previous fans were rated for higher performance, they would have been fighting to push much air though these small holes. I think most of their energy was wasted just holding static pressure inside the chassis.
 
Mkarango said:
Just installed my growatt spf 5000 es... the noise is too much, i hope a solution would be provided soon.
Click to expand...
I have this problem, I installed a Growatt SPF5000ES last year (firmware version: 040 05 701 ; 041 05 701), and the fan noise is acceptable and you barely notice it. This year I installed another Growatt SPF5000ES (firmware version : 067 01 1.04 ; 068 01 1.04), the fans will go to maximum speed with very little load, it seems like the load doesnt matter if it is 200 watts or 2000 watts.
One distributor in Lebanon is offering a firmware upgrade and promised it will solve this issue.
Can anyone upload the latest firmware version? If I couldnt find it online, im going to visit that distributor for the upgrade.
 
octal_ip said:
I've just replaced the fans in my SPF unit with some high quality 4-wire "silent" 80mm PC fans. Some minor rewiring was required as the plugs are different, however my unit has gone from an every day annoyance to something I can hardly hear now.

The original fans from Growatt were very high performance units (about 8W each), I replaced them with fans less than half the power.
Prior to this I'd been logging data from the 3 temperature sensors inside the unit, and made a comparison after the fans were replaced. Previously the hottest point in the unit, the buck converter temperature sensor, registered about 40°C while under peak load. It now reads 48°C with the same load and ambient temperature, a very acceptable difference given the massive drop in noise.

One thing I did notice while replacing the fans is that the inverter chassis only has a couple small perforated windows at the top for the hot air to exit. This limits the total airflow considerably - while the previous fans were rated for higher performance, they would have been fighting to push much air though these small holes. I think most of their energy was wasted just holding static pressure inside the chassis.
Click to expand...
Sounds like a good trade.

Would you elaborate on the wiring changes?
 
eXodus said:
Sounds like a good trade.

Would you elaborate on the wiring changes?
Click to expand...

The inverter uses a JST XH 2.54mm connector for the fans with the following pinout:

PinFunctionWire Color
1ControlBlue
2+12v DCRed
3SenseYellow
4GNDBlack

If you're using PC fans as your replacement, you'll quickly notice that the plug type doesn't match, and the order of the wiring is different. Just snip off the plug that comes with the fan, and attach a new JST connector according to the wiring above and you're good to go.
 
octal_ip said:
The inverter uses a JST XH 2.54mm connector for the fans with the following pinout:

PinFunctionWire Color
1ControlBlue
2+12v DCRed
3SenseYellow
4GNDBlack

If you're using PC fans as your replacement, you'll quickly notice that the plug type doesn't match, and the order of the wiring is different. Just snip off the plug that comes with the fan, and attach a new JST connector according to the wiring above and you're good to go.
Click to expand...

It sounds like the same problem which I have with my EG4 6500EX-48 inverters. They also using very loud, high speed fans which are not temperature controlled. I've modded the inverters by putting in temperature based PWM fan speed controllers while using the existing fans. If interested, you may follow the corresponding thread here: https://diysolarforum.com/threads/r...-6500ex-48-to-make-it-quiet.43606/post-746325
 
fmeili1 said:
It sounds like the same problem which I have with my EG4 6500EX-48 inverters. They also using very loud, high speed fans which are not temperature controlled. I've modded the inverters by putting in temperature based PWM fan speed controllers while using the existing fans. If interested, you may follow the corresponding thread here: https://diysolarforum.com/threads/r...-6500ex-48-to-make-it-quiet.43606/post-746325
Click to expand...
Fortunately the Growatt units have built-in PWM speed control, which is linked to the load of the MPPT and inverter individually. No need for any additional hardware.
 
octal_ip said:
Fortunately the Growatt units have built-in PWM speed control, which is linked to the load of the MPPT and inverter individually. No need for any additional hardware.
Click to expand...
Yes, the EG4 also has PWM controlled fan speed, but it's only load and/or running-mode controlled, but not temperature controlled! So I've put a temperature controlled PWM module between the inverters mainboard fan connector and the existing fan. The trick is to NOT connect the original PWM control pin from the mainboard to the fan, but instead, using the PWM control signal generated from the new temperature controller to control the fan speed. To tell the inverter, that the fans are spinning, the sensor/tacho signal from the fans is looped back to the original inverter fan connector - without doing this, the inverter will show an error code that the fan is not running. Now you need to attach the temperature sensor to the corresponding heat sink which the fan tries to cool down.

If the ambient is not too high, the fans will run with a very low RPM which makes them really quite.
 
fmeili1 said:
Yes, the EG4 also has PWM controlled fan speed, but it's only load and/or running-mode controlled, but not temperature controlled! So I've put a temperature controlled PWM module between the inverters mainboard fan connector and the existing fan. The trick is to NOT connect the original PWM control pin from the mainboard to the fan, but instead, using the PWM control signal generated from the new temperature controller to control the fan speed. To tell the inverter, that the fans are spinning, the sensor/tacho signal from the fans is looped back to the original inverter fan connector - without doing this, the inverter will show an error code that the fan is not running. Now you need to attach the temperature sensor to the corresponding heat sink which the fan tries to cool down.

If the ambient is not too high, the fans will run with a very low RPM which makes them really quite.
Click to expand...
Oh, I see what you mean. That's a pretty good idea, with the right settings it might even work well with the original fans.
 
octal_ip said:
Oh, I see what you mean. That's a pretty good idea, with the right settings it might even work well with the original fans.
Click to expand...
With this modification the fans will be able to speed up to full speed, if required. This avoids overheating in cases where the ambient temperature will get too high for whatever reason (for sure, it will be as loud as before in this situation). But under "normal" operating condition, the fans should run mostly with low RPM.
 
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