Medical Device Testing (CV%)

Hi all, looking for a bit of help.
I have a number of medical devices to test, 150 to be precise. Two levels of sample to test on each device. I am interested in accuracy and precision. Whats the minimum amount of replicates I can process on each device in order to get meaningful data out the other end. Ideally it would be between 15-30, but 4,500 tests is not practical. Was thinking of 5 tests on each device at each level so 1500 tests in total.
Thanks for you input.