the tracker must…

follow the sun in sync with it day in day out for a minimum of 50 maintenance-free years

every morning, the tracker, or more importantly, its payload, the sunlight energy absorber, must be point-able straight at the eastern sun as soon as practical, say from 7 to 9 am depending on the season, at most latitudes, and it must move east to west looking straight at the sun, until, say 5-7 pm – a good 8 to 12 hours

the absorber must also be capable of daily  north-south-north adjustments, small and precise, to track the sun in a second axis perpendicular to the daily east-west axis


suntracker + absorber must track both steps of the sundance - daily east-west path, with a small daily north-south-(north) adjustment


the tracker must be capable of the following:

i) comfortably working with a payload of 30 kg (66 pounds) – a reasonable guess at the maximum weight of the absorber-evaporator-condenser-wasteholder combo, henceforth called the ‘engine’

ii) each morning, a person, preferably a child – perhaps 8 9 10 years old, should easily be able to reposition the device from its westward look back eastward, accurately point the engine-mounted-tracker at the sun, and engage the tracking mechanism

iii) if the tracker drifts ahead or behind the sun, there must be a means to adjust track speed, making it faster or slower, to stay in sync with the sun. we will target 12 hours of adjustment-free sync time, once the device is accurately pointed at and tracking the sun

note: these target values, and other such initial assumptions will, as required, be tweaked tightened relaxed modified as-need-be, to migrate to the final target design values

iv) said person should be easily able to release the 2nd axis lock, make a small readjustment to the device in the north-south or up-down orientation, and then snap back to the tracker. this will need to be performed each morning, to account for the north-south seasonal variation in the sun’s position

v) person must be able to easily ‘wind’ the tracker each morning, to provide it with the energy needed to track the sun and move. ‘winding’ could include raising a weight, perhaps by pulling on a sturdy rope, or winding a sturdy handle, and ‘cocking’ the device

iv) must be maintenance free for at least 50 years. all well lubricated moving parts sealed within, dust free

that covers most of the requirements for the tracker

and the stand must be…

i) sturdy, of adjustable height at each of its 3 (or 4) legs, (or its ring base etc)

ii) capable of withstanding payload comfortably

iii) not hinder tilt of the engine from looking low to the east to glance at the sun as soon as possible each morning, to likewise looking westward as late as possible each evening

iv) friendly to port

tracker and stand to be made of metals, with sturdy designs


About Vishwa Narayan

who can live without water? drinking water for all is my goal, through Theertham, a not-for-profit organization i founded and registered in Texas. you can reach me at
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