# Thread: Fuel cell polarization curve how to use it

1. Hi,

I was wondering how can I use a polarization curve to determine the number of cells I'd require to supply say 10kW load? also need to determine the module terminal voltage and no load and full load? and the module efficiency at full load?

2.

3. >I was wondering how can I use a polarization curve to determine the number of cells I'd require to supply say 10kW load?

Easy way -

Use the polarization curve to determine the maximum power point of the cell. Determine what voltage you need; assume that number of cells in series. Then parallel cells until you get to the desired current. No load voltage is no load voltage of each cell times number in series. Full load is determined by max power point voltage times number of cells in series.

4. What is a Polarization curve in English, please.

I wonder is a fuel cell similar to a solar cell in that it has a fill factor? and could I use this to find the efficiency at full load?

6. Originally Posted by babe
What is a Polarization curve in English, please.
It's a curve that shows the voltage as a function of current. As the load current on the cell increases, its voltage goes down.

7. Originally Posted by Harold14370
Originally Posted by babe
What is a Polarization curve in English, please.
It's a curve that shows the voltage as a function of current. As the load current on the cell increases, its voltage goes down.
Thank you for replying in a concise and informational way. I do appreciate that more than you know! This I can understand!!

8. Originally Posted by johnoshea
I wonder is a fuel cell similar to a solar cell in that it has a fill factor? and could I use this to find the efficiency at full load?
The polarization curve results in a V/I curve similar to that of a solar cell. In both cases it is essential to find the peak power point to achieve maximum power out of the device. You can do this with a simple load sweep.