Editing Power-to-weight ratio (section)

====Fuel cell stacks and flow cell batteries====
[[Fuel cell]]s and [[Flow battery|flow cells]], although perhaps using similar chemistry to batteries, do not contain the energy storage medium or [[fuel]]. With a continuous flow of fuel and oxidant, available fuel cells and flow cells continue to convert the energy storage medium into electric energy and waste products. Fuel cells distinctly contain a fixed electrolyte whereas flow cells also require a continuous flow of electrolyte. Flow cells typically have the fuel dissolved in the electrolyte.
{| class="wikitable sortable mw-collapsible mw-collapsed"
|-
! [[Fuel cell]] type
! data-sort-type="number"|Dry weight
! data-sort-type="number"|Power-to-weight ratio
! Example use
|-
| Redflow Power+BOS ZB600 10kWh [[Zinc-bromine flow battery|ZBB]]<ref>{{cite web|url=http://www.redflow.com.au/Files/PowerBOSZB600%20-%20Limited%20Warranty.pdf|title=Redflow Power+BOS ZB600 Stand Alone Power System|publisher=Redflow|access-date=September 11, 2010|date=March 2010|url-status=dead|archive-url=https://web.archive.org/web/20100802114428/http://www.redflow.com.au/Files/PowerBOSZB600%20-%20Limited%20Warranty.pdf|archive-date=August 2, 2010}}</ref>
| 900&nbsp;kg
| 5.6&nbsp;W/kg (9.3&nbsp;W/kg peak)
| Rural Grid support
|-
| rowspan=2|[[Ceramic Fuel Cells]] BlueGen MG 2.0 [[Cogeneration|CHP]] [[Solid oxide fuel cell|SOFC]]<ref>{{cite web|url=http://www.cfcl.com.au/Assets/Files/BlueGen_Brochure(ENG_GER)_Mar-09.pdf|archive-url=https://web.archive.org/web/20091013093245/http://www.cfcl.com.au/Assets/Files/BlueGen_Brochure(ENG_GER)_Mar-09.pdf|url-status=dead|archive-date=October 13, 2009|title=BlueGen Modular Generator&nbsp;– Power + Heat|publisher=Ceramic Fuel Cells Ltd.|access-date=February 4, 2010}}</ref>
| rowspan=2|200&nbsp;kg
| 10&nbsp;W/kg <!-- max power = 2kW elec., 1&nbsp;kW heat -->
| rowspan=2|
|-
| 15&nbsp;W/kg [[Cogeneration|CHP]]
|-
| [[MTU Friedrichshafen]] 240&nbsp;kW [[Molten carbonate fuel cell|MCFC]] HotModule 2006
| 20,000&nbsp;kg
| 12&nbsp;W/kg
|
|-
| Smart Fuel Cell Jenny 600S 25&nbsp;W [[Direct methanol fuel cell|DMFC]]<ref>{{cite web |url=http://www.sfc.com/en/man-portable-jenny.html |title=The Jenny fuel cell by SFC |website=Smart Fuel Cell AG |access-date=March 8, 2020 |archive-url=https://web.archive.org/web/20090213151706/http://www.sfc.com/en/man-portable-jenny.html |archive-date=2009-02-13 }}</ref>
| 1.7&nbsp;kg
| 14.7&nbsp;W/kg
| Portable military electronics
|-
| [[UTC Power]] PureCell 400&nbsp;kW [[Phosphoric acid fuel cell|PAFC]]<ref>{{cite web|url=http://www.utcpower.com/fs/com/Attachments/data_sheets/DS0112_093008.pdf|publisher=[[UTC Power]]|access-date=February 4, 2010|title=UTC Power&nbsp;– Model 400 PureCell System|year=2008|location=South Windsor, [[Connecticut]], United States|url-status=dead|archive-url=https://web.archive.org/web/20090824003547/http://www.utcpower.com/fs/com/Attachments/data_sheets/DS0112_093008.pdf|archive-date=August 24, 2009}}</ref>
| 27,216&nbsp;kg{{Clarify|date=March 2020|reason=This is the shipping weight, not the installed weight, which could be substantially different}}
| 14.7&nbsp;W/kg <!-- 400 kW average lifetime output -->
|
|-
| GEFC 50V50A-VRB [[Vanadium redox battery]]<ref>{{cite web|url=http://www.gefc.com/info/2009112/2009112115605.shtml|title=GEFC 50V50A-VRB Vanadium Redox Battery Stack|publisher=GEFC|year=2010|access-date=February 5, 2010|archive-date=July 11, 2011|archive-url=https://web.archive.org/web/20110711081611/http://www.gefc.com/info/2009112/2009112115605.shtml|url-status=live}}</ref>
| 80&nbsp;kg
| 31.3&nbsp;W/kg (125&nbsp;W/kg peak) <!-- 2.5&nbsp;kW rated; 10kW max -->
|
|-
| [[Ballard Power Systems]] Xcellsis HY-205 205&nbsp;kW [[Proton-exchange membrane fuel cell|PEMFC]]<ref>{{cite web|url=http://www.fuelcells.org/info/charts/TransTechnical.pdf|archive-url=https://web.archive.org/web/20041013060109/http://www.fuelcells.org/info/charts/TransTechnical.pdf|url-status=dead|archive-date=2004-10-13|title=Transportation Fuel Cells&nbsp;– Technical Info.|access-date=2010-07-24|publisher=Fuel Cells 2000}}</ref>
| 2,170&nbsp;kg
| 94.5&nbsp;W/kg
| [[Mercedes-Benz]] [[Mercedes-Benz Citaro|Citaro O530BZ]]{{Cref2|•}}
|-
| [[UTC Power]]/[[NASA]] 12&nbsp;kW [[Alkaline fuel cell|AFC]]<ref>{{cite web|url=http://www.utcpower.com/fs/com/bin/fs_com_Page/0,11491,0115,00.html|title=Space Orbiter|publisher=[[UTC Power]]|access-date=February 5, 2010|year=2008|url-status=dead|archive-url=https://web.archive.org/web/20090905173435/http://www.utcpower.com/fs/com/bin/fs_com_Page/0%2C11491%2C0115%2C00.html|archive-date=September 5, 2009}}</ref>
| 122&nbsp;kg<!-- 270 pounds -->
| 98&nbsp;W/kg
| [[Space Shuttle orbiter]]{{Cref2|•}}
|-
| [[Ballard Power Systems]] FCgen-1030 1.2&nbsp;kW [[Cogeneration|CHP]] [[Proton-exchange membrane fuel cell|PEMFC]]<ref name="ballardfuelcells">{{cite web|url=http://www.ballard.com/files/pdf/Spec_Sheets/PEM_FC_Product_Portfolio_docmetrics.pdf|title=PEM Fuel Cell Product Portfolio|publisher=[[Ballard Power Systems]]|access-date=February 4, 2010|url-status=dead|archive-url=https://web.archive.org/web/20110707205935/http://www.ballard.com/files/pdf/Spec_Sheets/PEM_FC_Product_Portfolio_docmetrics.pdf|archive-date=July 7, 2011}}</ref>
| 12&nbsp;kg
| 100&nbsp;W/kg
| Residential cogeneration
|-
| [[Ballard Power Systems]] FCvelocity-HD6 150&nbsp;kW [[Proton-exchange membrane fuel cell|PEMFC]]<ref name="ballardfuelcells"/>
| 400&nbsp;kg
| 375&nbsp;W/kg
| Bus and heavy duty
|-
| [[NASA Glenn Research Center]] 50&nbsp;W [[Solid oxide fuel cell|SOFC]]<ref name="nasafuelcells">{{cite web|url=https://technology.grc.nasa.gov/documents/auto/Solid-Oxide-Fuel-Cells.pdf|title=High Power Density Solid Oxide Fuel Cell|publisher=[[NASA Glenn Research Center]]|access-date=June 24, 2015|url-status=dead|archive-url=https://web.archive.org/web/20130218040819/https://technology.grc.nasa.gov/documents/auto/Solid-Oxide-Fuel-Cells.pdf|archive-date=February 18, 2013}}</ref>
| 0.071&nbsp;kg
| 700&nbsp;W/kg
| 
|-
| [[Honda]] 2003 43&nbsp;kW FC Stack [[Proton-exchange membrane fuel cell|PEMFC]]<ref>{{cite web|url=http://world.honda.com/FuelCell/FCX/FCXPK.pdf|access-date=February 4, 2010|title=Press Information Honda Fuel Cell Power FCX|date=December 2004|publisher=[[Honda]]|url-status=dead|archive-url=https://web.archive.org/web/20081201135119/http://www.world.honda.com/FuelCell/FCX/FCXPK.pdf|archive-date=December 1, 2008}}</ref>{{Cref2|•}}
| 43&nbsp;kg <!-- 43 kW -->
| 1000&nbsp;W/kg
| [[Honda FCX Clarity]]{{Cref2|•}}
|-
| Lynntech [[Proton-exchange membrane fuel cell|PEMFC]] lab prototype<ref>{{cite conference|url=http://cat.inist.fr/?aModele=afficheN&cpsidt=2439605|title=Low-cost light weight high power density PEM fuel cell stack|last1=Murphy|first1=O.J.|last2=Cisar|first2=A.|last3=Clarke|first3=E.|book-title=Proceedings of the Symposium on Batteries and Fuel Cells for Portable Applications and Electric Vehicles|pages=3829–3840|year=1998|location=[[INIST]]|access-date=2008-10-02|archive-date=2015-10-16|archive-url=https://web.archive.org/web/20151016214031/http://cat.inist.fr/?aModele=afficheN&cpsidt=2439605|url-status=live}}</ref>
| 0.347&nbsp;kg <!-- "power output of over 520 W" -->
| 1,500&nbsp;W/kg
|
|-
| PowerCell S3 125&nbsp;kW commercial [[Proton-exchange membrane fuel cell|PEMFC]]<ref>{{cite web|url=https://www.powercell.se/wordpress/wp-content/uploads/2018/12/S3-Produktblad-190430.pdf|access-date=January 6, 2020|title=PowerCell S3 Data Sheet|archive-date=August 6, 2020|archive-url=https://web.archive.org/web/20200806120048/https://www.powercell.se/wordpress/wp-content/uploads/2018/12/S3-Produktblad-190430.pdf|url-status=dead}}</ref>
| 43&nbsp;kg <!-- 125 kW -->
| 2,900&nbsp;W/kg
|
|}
{{Cnote2 Begin|liststyle=disc|colwidth=40em}}
{{Cnote2|•|n=0|Full vehicle power-to-weight ratio shown [[#Vehicles|below]]}}
{{Cnote2 End}}