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Originally posted by Cosmicdjinn
reply to post by serbsta
Bloom's version of a electricity generating machine is for profit, not for advancement.
Originally posted by argentus
reply to post by Blazer
We just spent USD $12,000 for solar and a wind genny and are about 90% off-grid. It just depends upon the size of your house, and how creative a person is with paring down their energy needs.
Example: We bought a 24-volt fridge and freezer. BOTH of these together use about 1/12 of the power of our previous fridge/freezer. Our water pump for house pressure is 12-volt, runs off two batteries wired parallel and charged by a small PV array. Our water heater is a homemade solar collector.
We can do better, if we just put our minds to it. Our $12,000 will pay off in about 3 years (bills WERE about USD $350-400/month).
I think the Bloom Box is an innovation in that it is a more efficient generator. I really don't like that it requires the Bloom Corp. fuel cells to make it so. $3000 is not so much for a home generator, IF and ONLY IF the other associated costs make for a short paydown.
People WANT to be energy efficient. When technology emerges that is a true cost-savings, they will flock to it; they won't have to be tricked into it.
p.s. I don't know where you get the "20% efficiency" figure from. The 1250 watt array, on a sunny day, at peak often pulls in 950 watts. Averaged over a good, sunny day, we might realize an average of 600 watts for 7-8 hours. That's more than 4000 watt-hours or 175 ah.
The net capacity factor of a power plant is the ratio of the actual output of a power plant over a period of time and its output if it had operated at full nameplate capacity the entire time. To calculate the capacity factor, total energy the plant produced during a period of time and divide by the energy the plant would have produced at full capacity. The capacity factor should not be confused with the availability factor or with efficiency.
Solar energy is variable because of the daily rotation of the earth and because of cloud cover. However, solar power plants designed for solar-only generation are well matched to summer noon peak loads in areas with significant cooling demands, such as Spain or the south-western United States. Using thermal energy storage systems, the operating periods of solar thermal power stations can be extended to meet baseload needs.[3]
Wikipedia.
That for PV is significantly flatter; thus fluctuations at short time scales are larger relative to those at long time scales for PV than for wind. While wind’s capacity factor varies from 32% at the sites examined to 40% at excellent sites, the capacity factor for a 4.6 MW PV array in Arizona is determined to be 19% over two years."
www.treehugger.com...
p.s. I don't know where you get the "20% efficiency" figure from. The 1250 watt array, on a sunny day, at peak often pulls in 950 watts. Averaged over a good, sunny day, we might realize an average of 600 watts for 7-8 hours. That's more than 4000 watt-hours or 175 ah.
It appears that the unsubsidized price of the Bloom Box is about $7-8,000/kW, so their 100 kW units cost $700,000-800,000 without subsidy. As a fuel cell, it also needs fuel to run, in this case natural gas or another source of methane (such as landfill gas or biogas from anaerobic digesters).
The unsubsidized cost would be 13-14 cents/kWh, with about 9 cents/kWh from the capital costs of the Bloom box and 5 cents/kWh from natural gas costs, according to Luz Research. If natural gas prices rise or fall 50% (gas prices are often volatile), overall price would fluctuate from 11.5-12.5 cents/kWh to 20.5-21.5 cents/kWh. That unsubsidized price is still too high to compete in most markets with retail electricity without subsidy. However, this is the first generation, and if Bloom can bring prices down (and/or natural gas prices are stable/low), there could be a significant market for this fuel cell.
As far as climate benefits, supposedly it generates electricity at 50-55% conversion efficiency. CO2 emissions when running on natural gas would be just under 0.8 pounds/kWh, which compares favorably to electricity from central station coal-fired plants (2 lbs/kWh) or natural gas plants (roughly 1.3 lbs/kWh) and the national average for on-grid electricity (around 1.3-1.5 lbs/kWh). Clearly, though, the Bloom Box is still not a zero emissions tech and would only cut emissions by roughly 50% relative to the national average, unless it runs on landfill gas or biogas or hydrogen from electrolysis fueled by zero-carbon electricity (which would be much more expensive as you have to add cost of electrolysis unit, higher cost electricity, and about 30% conversion losses in electrolysis).
blogs.forbes.com...
I also hear that it may require zirconium oxide as a membrane (can anyone confirm that?) and zirconium doesn't grow on trees, nor is it processed quickly, which may hamper production volumes.
So is the Bloom Box the solution to all the world's energy problems? Of course not. But could it finally move fuel cells for stationary power generation a big step forward? It looks like the chances are good. Only time, and the tests of the market, will tell...
It's worth noting though that with the idea initially funded through NASA's Mars program and the initial product launch only enabled by public deployment incentives, the Bloom Energy fuel cell is another good example of how public investments in technology R&D and deployment can catalyze significant private sector investment, innovation and entrepreneurship to drive forward a new technology with potential for widespread application as costs come down.
blogs.forbes.com...