SeattlePioneer writes, 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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