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Retirement Discussions / Retire Early CampFIRE
|Subject: Re: OT: Fuel Cells for remote site||Date: 3/27/2001 2:44 PM|
|Author: metallurge||Number: 34792 of 709676|
You'd better size that based on your peak seasonal loads, not the year around average. If you don't have air conditioning, the peak load is usually in the
wintertime, and a winter time bill will be for twice or more the average power level used throughout the year. That one KW fuel cell made be a perpetual
brownout during the winter months since it and the battery supplements will be underpowered for average household usage.
...to which duggg replies,
That's an excellent point.
...to which I say,
Well, what you're both forgetting is that a 1kW PEM fuel cell produces about 1.2 kW in usable heat, besides the electricity. This heat can be used for hot water, and environmental heating. If you have a use for the heat, the overall efficiency of a PEM fuel cell rises from the 40% electrical efficiency to more like 70+% overall.
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