Alan wrote:

In message , The Natural Philosopher wrote


Then your specification is most obviously wrong!!!
;-)
You'll eventually be lured by the hypnotic gaze of a Henry...
Given the improvement in battery performance in the last 10 years,
it must
surely be possible to buy something approximating to a dust-buster on
steroids. I haven't seen one though.



A SUB C cell will deliver about 30 watts for 6 minutes, top technology.

You will need therefore around 30 of them to get a kilowatt for 6
minutes.

The cost will be around £100 for these rechargeables, to give you 6
minutes of mains performance vaccum cleaning.

The unit will weigh 15lb for the batteries alone.


Now would you care to rethink that? :-)



Furthermore, much of the improvement in rechargeable battery technology
has been targeted at applications where very little power is required,
but for very long periods of time (mobile phones etc.)


However those cells (Lithium technolofgy)ARE avaialable and DO deliver
approximately 50% more power to weight and about 4 times the energy per
unit weight.

But your vaccum cleaner now is costing nearly $1000...



Something designed for a very high capacity for its size, weight and
cost but can only deliver a few tens of mAmps will not be suitable for
supplying the 1000W required for every working solution suggested in
this thread.



Packs delivering up to 50-60A at whatever voltage are being used at the
moment. Probably a kilowatt for ten or twenty minutes is achievable.