Anyone installed the Solar powered roof ventilator fan?
This is not the mushroom wind turbine.
Saw a few reviews and video, seems good, come with brushless motor and quiet.
Some company list 2K+ rm, online 800rm+(without installation).

would like to know too

I installed one from Forest Wind, around RM1.4k (can’t remember exactly).
The DC motor died after about 1.5 years, but they honoured the warranty and came to replace the faulty motor.

Not sure if I was just unlucky, they told me it normally lasts around 8 years+.
It does improve ventilation a bit, but honestly, if you have the budget and time, I would recommend spending on proper thermal insulation instead. That gives a much better result overall

Thanks for valuable feedback. How many Watt is your model? I saw they have range from 10 - 60 Solar watt .
Proper themal insulation as in roof linings and stuff?
I am more targeting expelling hot air trapped in between ceiling and roof.
I may drive moisture from toilets to ceiling with ceiling ventilators like Khind / Airgard.

Does it really help to cool down the house?

Is there any risk like robbery? Or masuk habuk? or hujan?

Thanks in advance.

I would go with Ruzumaki. I know the hot air trapped above ceiling but either you are using that power-less turbine or powered ventilation, the best result would still be the air temperature outside the house (it is higher sine rooftop radiating heat which will not be cooled down by fan sucking hot air underneath the roof.

In the case above, even if you have cooler air above ceiling, it will not provide insulation to room or hall below ceiling, thus air-conditioning will need to work harder and consume more power. With proper insulation, you do not need to care about hot air above ceiling but by doing so, it will cool down space under roof even if you do not use air-conditioning.

If you OK with DIY, you can just get a solar panel fan, and attach it under the normal unpowered ventilator and pass the fan wire connecting to the solar panel through it.

MUCH cheaper, and more easy to replace. I did that on my roof which already had existing turbines, with an 8inch fan connected to a solar panel. You just have to secure the panel properly cause if strong wind it could fly off, I just put some extra roof tiles I had.

I think for burglary access is subjective.
The installation require a hole probable 10inch wide, or a replacement of 1 or 2 roof tiles. So it depends how accessible is your house roof.
It will not likely be bolted in but clipped, and silicon gel to prevent water flowing under.
and it should be installed at the ridge/apex of a roof ( the tip point) and under the Ridge flashing ( metal sheet that runs across) to let the rain water flow over the flap of the ventilator bottom

30W
yes, roof lining
In that case the solar ventilator should be quite useful
Try to get a model that has a power cable or battery, so it can run at night as well
The heat and humidity trapped in the roof during the day will still remain at night, so you might still feeling uncomfortable at night

Thanks for the update!