Comments for mapawatt

Comment on Bicycle Power – How many Watts can you produce? by Hub or Derailleur, Which Is Best? - Page 5

Hub or Derailleur, Which Is Best? - Page 5 — Wed, 16 May 2012 23:48:16 +0000

[...] Originally Posted by hech I am not an engineer nor even a gifted cyclist, however I don't have to be either to see potential for failure in a transmission system designed specifically for personal pedal power. None of the crank manf so far as Im aware have upgraded their derailleur systems to cope with the additional demands of electric assist and I mean only to relate my personal concerns in that regard and suggest the nuvinci as a sensible alternative. You dont have to be a francophobe traindriver to dislike derailleurs…………. Derailleur systems are the ones used by the top professional cycling teams. A good professional cyclist climbing an Alpine stage of the Tour de France will generate 400 to 500 watts. We very rarely see failure of derailleur gear systems on these stages. A good club racing cyclist will probably generate 200 – 250 watts so even these powerhouses should be OK with a 250 watt motor. I would guess (which is all I can do) that the average Ebiker will not produce much more than 180 watts of power Some ideas of cyclist's wattage are – You can get quite a good workout at 200 watts, push a mean time trial at 300 watts, and tour the Alps fast at 400 watts. I would imagine that the average rider with using a crank motor will not damage a derailleur system. However I have no idea what wattage a hub gear can with stand. Having said that I prefer hub gears and have used a nexus 7 speed for about 3 years on my unpowered bike. Bicycle Power – How many Watts can you produce? | mapawatt [...]

Comment on Sunheat Infrared: Does it live up to claims? by pericles

pericles — Wed, 16 May 2012 08:51:54 +0000

It should be said that there are many so-called infrared heating systems around. Unfortunatly most are not as they say and at most can be used only for supplamentary heating. The only true infrared heating system I know of in the USA and Canada is the Prestyl system which does exactly what it says.

Comment on Solar PV Diagram by D,B.Shinde.

D,B.Shinde. — Mon, 14 May 2012 08:39:05 +0000

Please let us know the instrumentation for monitoring the parameters of one sample PV station

Comment on Energy Tools for Beginners – Part I – How Much Energy Do I Use? by Chris

Chris — Sun, 13 May 2012 21:10:06 +0000

Here you go Charlene: Energy tools for beginners - real time energy monitors. You might also like our post on the future of home energy monitoring.

Comment on What is a kiloWatt-hour a.k.a kWh? (part 1) by Energy Tools for Beginners – Part I – How Much Energy Do I Use? | mapawatt

Sun, 13 May 2012 21:08:52 +0000

[...] unit for electricity usage. If this term is not familiar to you, read Chris’ post on “What is a kilowatt-hour” for a good primer on this topic. In addition to the kWh energy unit, I discovered that [...]