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capacitor to keep voltage stable? | 4 comments (4 topical, editorial)
Re: capacitor to keep voltage stable? (3.00 / 0) (#2)
by A6D9 on Sun Sep 21st, 2008 at 03:22:43 PM MST
(User Info)

thank you very much.  :)
I'm not lookign for any real power #'s and i found a 200 watts grid tie inverter.  

but the inputs are in the 12 volt range.  this is why i was thinkign of going this route.  if I can produce a steady 200 watts 24/7.  I could allmost cover my monthly usage.   and this inverter is stackable.  So i could go 2X200 Wattes and sell power back to the grid.  

I'm still not sure how much power my site can produce yet.  move in on oct 10th.  so next summer is my plan.  but I'm trying to envision some sort of way of doing this.

Thanx Darren
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Re: capacitor to keep voltage stable? (3.00 / 0) (#3)
by Ungrounded Lightning Rod on Sun Sep 21st, 2008 at 08:53:08 PM MST
(User Info)

At the currents and frequencies involved you'd need a humungous capacitor to do a detectable amount of "fill in the valleys" of the ripple.  A very tiny battery will do the same job just fine.

If you're using a backfeed inverter designed for the purpose it will also keep the battery voltage at the right level and use the line as a dump load.  (If you're using one intended for solar it wont, so batteries might not be what you want in that case.  But trying to use a solar panel backfeed inverter with a water genny is problematic other ways.)

[ Parent ]



Re: capacitor to keep voltage stable? (3.00 / 0) (#4)
by Flux on Mon Sep 22nd, 2008 at 01:59:33 AM MST
(User Info)

Capacitors don't regulate volts in the same way as a battery. The battery voltage clamping ability is related to the electrolytic properties and the emf associated with different materials.

A capacitor will act as an energy store but in this case would be almost impractical. you would still need a charge controller to clamp the voltage and it seems a crazy approach. If you want grid tie without batteries then there are a choice of suitable inverters that can accept the voltage range of small hydro.

Flux

[ Parent ]



capacitor to keep voltage stable? | 4 comments (4 topical, 0 editorial)

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