Recharging a battery
William Cox wrote:
>
> 10 farad cap is only a couple of dollars from Digi-Key. The problem is that
> they are only 2.5 volts. You could wire them in series. www.solarbotics.com
> just got in 25 FARAD caps. $25 though [noparse]:)[/noparse]
> -William
>
>
Original Message
> From: Chris <c_rosney@y...>
> To: <basicstamps@egroups.com>
> Sent: Tuesday, May 02, 2000 9:02 PM
> Subject: [noparse][[/noparse]basicstamps] Recharging a battery
>
> > I need to have a stamp powered for 24 hours a day, and the plan is to
> > use a battery supply at night, and a set of photo cells durring the
> > day. What i need to know is how i can recharge the battery through
> > the solar cells once it has become drained. I only want to use
> > regular AA or 9V rechargible batteries, nothing fancy.
> >
> > I know you can also get big (3.3F) capacitors that will do the job
> > quite nice, but i they're kind of expensive, don't last as long and i
> > wanted to know if i could do it using ordinary cells.
> >
> > -Chris
> >
> >
> >
> >
If ye wire them in series, me thinks the capacitance will go down.
1/C = 1/c + 1/c + 1/c
--
Best Regards
Tom Rose
President ETA
For Opacity Training and Measurement Services and Products Visit
http://www.eta-is-opacity.com
For Baghouse Monitors Visit
http://www.tartek.com
>
> 10 farad cap is only a couple of dollars from Digi-Key. The problem is that
> they are only 2.5 volts. You could wire them in series. www.solarbotics.com
> just got in 25 FARAD caps. $25 though [noparse]:)[/noparse]
> -William
>
>
Original Message
> From: Chris <c_rosney@y...>
> To: <basicstamps@egroups.com>
> Sent: Tuesday, May 02, 2000 9:02 PM
> Subject: [noparse][[/noparse]basicstamps] Recharging a battery
>
> > I need to have a stamp powered for 24 hours a day, and the plan is to
> > use a battery supply at night, and a set of photo cells durring the
> > day. What i need to know is how i can recharge the battery through
> > the solar cells once it has become drained. I only want to use
> > regular AA or 9V rechargible batteries, nothing fancy.
> >
> > I know you can also get big (3.3F) capacitors that will do the job
> > quite nice, but i they're kind of expensive, don't last as long and i
> > wanted to know if i could do it using ordinary cells.
> >
> > -Chris
> >
> >
> >
> >
If ye wire them in series, me thinks the capacitance will go down.
1/C = 1/c + 1/c + 1/c
--
Best Regards
Tom Rose
President ETA
For Opacity Training and Measurement Services and Products Visit
http://www.eta-is-opacity.com
For Baghouse Monitors Visit
http://www.tartek.com
Comments
use a battery supply at night, and a set of photo cells durring the
day. What i need to know is how i can recharge the battery through
the solar cells once it has become drained. I only want to use
regular AA or 9V rechargible batteries, nothing fancy.
I know you can also get big (3.3F) capacitors that will do the job
quite nice, but i they're kind of expensive, don't last as long and i
wanted to know if i could do it using ordinary cells.
-Chris
they are only 2.5 volts. You could wire them in series. www.solarbotics.com
just got in 25 FARAD caps. $25 though [noparse]:)[/noparse]
-William
Original Message
From: Chris <c_rosney@y...>
To: <basicstamps@egroups.com>
Sent: Tuesday, May 02, 2000 9:02 PM
Subject: [noparse][[/noparse]basicstamps] Recharging a battery
> I need to have a stamp powered for 24 hours a day, and the plan is to
> use a battery supply at night, and a set of photo cells durring the
> day. What i need to know is how i can recharge the battery through
> the solar cells once it has become drained. I only want to use
> regular AA or 9V rechargible batteries, nothing fancy.
>
> I know you can also get big (3.3F) capacitors that will do the job
> quite nice, but i they're kind of expensive, don't last as long and i
> wanted to know if i could do it using ordinary cells.
>
> -Chris
>
>
>
>
-William
> If ye wire them in series, me thinks the capacitance will go down.
>
> 1/C = 1/c + 1/c + 1/c
> --
> Best Regards
> Tom Rose
> President ETA
>
> For Opacity Training and Measurement Services and Products Visit
> http://www.eta-is-opacity.com
> For Baghouse Monitors Visit
> http://www.tartek.com
>
>
>
>
>
> When you wire capacitors in series, all that happens is the total
> capacitance drops, and the voltage is still 2.5V.
>
> 1/CT = 1/C1 + 1/C2...
>
> -Chris
Quote mode on...
"Capacitors are used in series to provide a higher breakdown rating for
the combination. For instance, each of hte three equal capacitances in
series has one-third the applied voltage."
Quote mode off.
3 caps rated at 10uf/15v in series would equal 3.3uf/45v
Quote from Grob Basic Electronics fourth edition ( don't ask the
copyright date (-; )
Hope this helps,
Dale Harwood [noparse][[/noparse] N4VFF ]
internet> dale@h...
ax.25> n4vff@n4vff.#cha.tn.usa.noam
#include <std_disclaimer.h>
> If ye wire them in series, me thinks the capacitance will go down.
>
> 1/C = 1/c + 1/c + 1/c
> --
> Best Regards
> Tom Rose
> President ETA
>
> For Opacity Training and Measurement Services and Products Visit
> http://www.eta-is-opacity.com
> For Baghouse Monitors Visit
> http://www.tartek.com
You thinks right, but they'd be fine in parallel. But you still can
only use 2.5 volts. And in any case, two one 1F capacitors will cost
more than one 2F anyay.
-Chris
> 10 farad cap is only a couple of dollars from Digi-Key. The problem
is that
> they are only 2.5 volts. You could wire them in series.
www.solarbotics.com
> just got in 25 FARAD caps. $25 though [noparse]:)[/noparse]
> -William
>
>
Original Message
> From: Chris <c_rosney@y...>
> To: <basicstamps@egroups.com>
> Sent: Tuesday, May 02, 2000 9:02 PM
> Subject: [noparse][[/noparse]basicstamps] Recharging a battery
>
>
When you wire capacitors in series, all that happens is the total
capacitance drops, and the voltage is still 2.5V.
1/CT = 1/C1 + 1/C2...
-Chris