Active Power has struggled over the last few years with falling revenue. They have negative EPS and so they have no P/E. Still, the P/S is 1.09 which suggests the stock is undervalued in relation to the amount of sales the company is doing.
Even though EPS is negative, the EPS forecast is rising. Just this week, the EPS forecast was raised from -$0.11 to -$0.09.
The stock chart of Active Power shows a downtrend that has reversed and is heading higher against an uptrend support line. This is a continuation pattern and the bet is that the stock will continue bouncing off this .