I am considering buying this powerbank because I need a wireless power source for a computer mounted on a trolley. The computer would be in constant use (slide show, videos) and it would be an advantage if the battery lasts accordingly. What are your experiences with this? How long can a laptop/computer be operated without its own battery? And is an overnight charge sufficient to fully charge the powerbank?

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We use the PowerBank to power a notebook (HP ZBook 15) when we are "in the field" for flights with a drone and helicopter. A field report from one of our users:
I use exactly this powerbank in the helicopter to power a laptop. 
- I have never had any problems such as the sockets not working (I read this as a shortcoming before I bought it). 
- It takes 15-20 hours to fully charge mine, and it charges very slowly (I don't know if that's just me), so it runs out of power overnight.
- Whether this power bank is sufficient to power a PC cannot be answered in a general way. The bank has 149Wh, so you would have to calculate that yourself, as we don't know the consumption of your PC.  However, the thing will probably not last a whole day.

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It depends on what kind of device is connected. A modern notebook consumes much less power than an old PC.
In the best case, 1 to 2 hours. My TV survived 1 1/2 hours. One overnight charge is enough to fully charge the powerbank.

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Probably not, a computer usually needs more than the available 150w. And even if an inverter is so inefficient that the 41600 mAh are used up in a short time, in addition, the power supply unit of the pc/ laptop also has a relatively large loss of power I would look for a powerbank that does not have to make the diversions via 220 V, possibly one with usb C if compatible with the laptop

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