dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
2
share rss forum feed

lutful
... of ideas
Premium
join:2005-06-16
Ottawa, ON
kudos:1

2 edits
reply to SparkChaser

Re: GravityLight: lighting for developing countries.

I have to do some calculations but maybe hand-cranked pulleys can be used to pull up a much bigger weight (rocks/bricks/water containers) to store much higher potential energy.

Another option could be a small enclosed flywheel assembly which is spun up to very high rpm using hand cranked mechanism. Yet another option is a heavy pendulum on a low friction pivot?

However, the cost of the mechanics of such battery-less systems need to compare well against locally made and recycled lead-acid batteries which are quite cheap.

*** Rural solar is quite feasible for developing countries. The country where I was born has millions of "solar home systems" ... see my old post ( »Re: Solar Training ) for a photo montage of rural female entrepreneurs (often with just grade 5 education) assembling the charge controller PCBs and installing these systems.

Google image search shows many more examples: »www.google.ca/search?q=banglades···&bih=676