A couple of comments:
- The latest AP-9x datasheet mentions 8W as the maximum (worst-case) power conumption when powered from POE
- In typical operation, the AP-9x will consume significantly less, especially when considering the average power consumption of multiple devices. 6W per AP is probably a safe number
- When using POE, some additional power will be consumed (lost) by cable resistance, so the power draw from the POE source will be a bit higher. This depends on cable type & length, supply voltage and current needed to supply power to the AP. At 6W AP consumption, and assuming CAT5 cable and max length, this adds just 0.25W though.
I would think that if 180W is available, it should be enough to power up to 30 AP-93 units.
Thanks,
/Onno