Ballard Power -world leader zero-emission PEM fuel cells Message Board

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Technology Stocks : Ballard Power -world leader zero-emission PEM fuel cells

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To: michael a. rowe who wrote (2718)	6/7/1998 10:53:00 AM
From: Terry Lyon	Read Replies (1) of 5827

ERC posted a news release on 3 June, I think this has been posted on SI on the ERC thread. They claimed 47% efficiency to electricity for their latest design demonstrator stack of 250 kW fed with pipeline natural gas!! They claim this should translate to over 50% in commercial operation!! My concern is getting the fuel cells direct current converted to alternating current to feed the power mains. This is not just a simple switching problem, as the AC needs to be a pure sine wave. This might be possible with really hugh coils of large diameter wire and very large storage capacitors. Also the electronics has to sense the phase of voltage on the power grid soas to push current into the grid otherwise there will be lots of sparks and flame!! This is much less of a problem than DC to AC. The most serious problem would be posed when power is interupted in the grid then the fuel cells DC to AC inverter wouldl be feeding a dead short.

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