This depends on the size and required pressure of the SUPs.
At the same time, the pump is usually designed for one SUP at a time; the manufacturer does not specify a maximum number per use.
The KOOR Aria battery-powered compressor air pump is designed to inflate several stand-up paddle boards (SUPs) in succession. However, it is important to pause the pump regularly to avoid overheating. It is recommended to take a break of 5-10 minutes after about 10-15 minutes of operation to allow the device to cool down. This will help to prolong the life of the pump and ensure that it does not overheat.
2 can be inflated safely. Please note, however, that the pump is noisy and takes ages to build up pressure in the SUP. It is best to pump by hand and only use the pump towards the end, then it is ideal.
The STX HT 790 pump is very similar to the Koor Aria pump and also has a similar mechanism and piston to the Indiana SUP pump. Unfortunately, we cannot answer how identical it is in concrete terms.