[clug] Exercise and pay the bills!
Robert Edwards
bob at cs.anu.edu.au
Sun Feb 8 23:28:05 GMT 2009
Hi Paul,
If you get an appropriate alternator (ie. 48V), you can get more-or-less
constant voltage across the range of RPMs by adjusting the stator
voltage. I believe that this is how wind-farm generators work (could be
wrong) and is how most car alternators regulate their output voltage to
give more or less constant 13.8VDC (not 12VDC!).
A (smallish) car alternator (ie. 13.8V) and a 12V-48V inverter might be
the best bet to get 48V into your power feed-in.
Hope this helps.
Bob Edwards.
btw. does anyone know how the electricity authorities "switch off"
a segment of their 240V power line (eg. for tree-clearing or other
maintenance) when there are all these solar-powered power feed-ins
popping up everywhere and effectively juicing up the line? I have
always wanted to know how they turn it all off.
Paul Wayper wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I'm assuming a reply to the list is what you wanted here, Brad:
>
> Brad Hards wrote:
> | On Sunday 08 February 2009 07:45:56 am Paul Wayper wrote:
> |> Most exercise machines sold these days just use either friction,
> magnetic
> |> coupling or resistive loads as the 'sink' for work done. Since Kate
> and I
> |> are in the process of getting a solar panel system put in, and the
> inverter
> |> can take 48VDC and put it onto the grid as 240VAC, I was thinking of
> |> getting a 48VDC generator and hooking it up to some exercise system and
> |> generating actual usable power while I work out.
> | I think this is the part you are going to have trouble with. You need
> to sort
> | out the interaction with the storage system and the grid-connect part. (A
> | path from 240V line power to the bike isn't such a good idea...)
>
> The plan is to stick the 48VDC at variable amperage into the input side
> of the
> inverter - which is already designed to cope with a bunch of solar
> panels are
> already providing fixed voltage at variable amperage throughout the day.
>
> HTH,
>
> Paul
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
> Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org
>
> iEYEARECAAYFAkmOkmIACgkQu7W0U8VsXYLwUgCePVf4bT8Dw3caEtwHmK1Cjm8C
> /qcAn39Jik91i9bDu3DMr8xTwLsimwNh
> =yyyj
> -----END PGP SIGNATURE-----
More information about the linux
mailing list