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This is a general purpose, hydrogen/air fuel cell that is assembled, tested, and ready for use.

The Flex-Stak is a dismantlable open-air cathode fuel cell that allows for users to input their own custom PEM MEAs for testing!

Stack Contents Include:

✔ Plastic Endplates
✔ Graphite Composite Bipolar/Monopolar Plates
✔ High Performance PEM MEAs
✔ Expandable Design (See Flex-Stak Expansion Kits)
✔ Hardware

Technical Properties:

• MEA Active Area: 3.2 x 3.2cm (10cm²)
• MEA Membrane Area: 5.3 x 5.3cm
• Graphite Plate Overall Dimensions (L x W x D): 6.3 x 6.3 x 0.4 cm
• Recommended Torque Value: 8-10 inlbs

Flex-Stak Properties	1 Cell	5 Cell	10 Cell	15 Cell	20 Cell
Nominal Output - Watts	0.25 to 0.35	3 to 3.5	6 to 7	9 to 11.5	12 to 14
Nominal Operating Voltage**	0.45 to 0.6	2.3 to 3	4.6 to 6	7 to 9	9.5 to 12
Hydrogen Consumption (cc/minute)	10.6	53	106	162	400

* The provided output numbers are based on the forced air operation.
** The Flex-Stak nominal operating voltage per cell is typically around 0.45 to 0.6 V, but could vary between 0.4 and 0.9V per cell depending on how hard you are running the cell (i.e. pulling more current will result in a lower cell voltage, less current will have a higher cell voltage). Humidity of the H2 gas and stack temperature will also play a major role in the power output (or voltage or current) values.

Please note that the Flex-Stak Assembled does not come with guide dowels. 1/8" guide dowels are reccommended for assembly of the stack to aid in the alignment of the components.