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Re: [EVDL] Buddy pairs AGM & Floodi

Snip
" Are the actual voltages the same across a fully
charged AGM and a fully charged floodie?
Marty
Snip

I was planning on using a 72vdc pack of AGM's, and a
78vdc pack of Golf Cart 6volt floodies. You think the
higher voltage floodie pack, will help to recover the
AGM's once the EV is idle for awhile? When
recharging, I'd recharge each string with separate
chargers rated to the string's voltage, after
disconnecting them from each other with knife
switches.

M.Barkley
www.texomaev.com




--- Marty Hewes <[email protected]> wrote:

> I'm thinking if you just paralleled them, the
> internal resistance would
> regulate the load sharing during acceleration and
> limit the current between
> the strings during recharge. I need to look at the
> cell voltages of both
> types at full charge, under load, and partially
> discharged, consider the
> internal resistances involved, and see what should
> go back and forth between
> the two. With the cells simply paralleled, I'm not
> sure the voltages would
> ever be different enough that the internal
> resistance wouldn't handle the
> current limiting. Logically, the current going back
> into the AGM's from the
> floodies has to be less than the floodie current
> during acceleration, since
> the internal resistances of the AGM's and floodies
> would be in series during
> recharge and the voltage across the AGM's would come
> back up with the load
> removed. I'd think the difference in voltage
> between the two strings may
> not even be enough to recharge the AGMs.
>
> Are the actual voltages the same across a fully
> charged AGM and a fully
> charged floodie?
>
> Marty
>
> ----- Original Message -----
> From: "TrotFox Greyfoot" <[email protected]>
> To: "Electric Vehicle Discussion List"
> <[email protected]>
> Sent: Friday, August 24, 2007 9:29 AM
> Subject: Re: [EVDL] Buddy pairs AGM & Floodi
>
>
> > To bring back the advantage of topping up the AGMs
> you could provide a
> > current limited path between the batteries that
> bypasses the blocking
> > diode. The cheap and easy way would be to provide
> a resistor around
> > the diode with a better approach integrating an
> active
> > current-limiting circuit similar to those used for
> LED protection in
> > the proper charging direction.
> >
> > Again, you still have charging issues to work
> around...
> >
> > Trot, the thinkerin', fox...
> >
> > On 8/24/07, Timothy Balcer <[email protected]>
> wrote:
> >
> > <<snip>>
> >
> >> But.. the advantage of topping off the AGMs from
> the floodies to
> >> increase their cycle life would be gone.
> >>
> >> Wow. Choices. :) It's like walking into a diner
> and having 100 menu
> >> items! How do I make the perfect meal?
> >>
> >> --T
> >
> >
> > --
> > | /\_/\ TrotFox \ Always remember,
> > | ( o o ) AKA Landon Solomon \ "There is a
> > | >\_/< [email protected] \ third
> alternative."


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