Re: (ET) Chargers (and winch)

[David Brandt <ev_dave13 yahoo com>]

Yes, you can get charge controllers that are temperature compensated and 
are programmed for a variety of charge regimens.  I don't know if they 
fully shut the panels off from the pack when done, though.  The trick is 
finding one for a 36V pack.  Controllers for 24 and 48 volt pack sizes are 
common.

They could also run a ventilation fan to keep temps down.  In fact you can 
buy a couple types of vent fans that have panels built onto them.

David Brandt


--- On Thu, 8/13/09, Mike Finck <M Finck setterlin com> wrote:

> From: Mike Finck <M Finck setterlin com>
> Subject: Re: (ET) Chargers (and winch)
> To: noaddress drmm net, elec-trak cosmos phy tufts edu
> Date: Thursday, August 13, 2009, 3:45 PM
> With that segue I would like to move
> to a related topic of keeping the
> batteries in my golf cart happy.  This thing sits in a
> cute little golf
> cart garage unattended for 10 months or more, I bet temps
> in the garage
> can reach 120 degrees.  I don't see leaving anything
> plugged in
> unattended for that long as wise.  But I was thinking
> a very small array
> of solar panels that would by size be incapable of creating
> a hazard
> might be a start.  Could the panels be controlled to
> be truly off and
> charge only when discharging hits a programmed point?
> 
> 
> Michael H. Finck
> 
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu]
> On Behalf Of David Roden
> Sent: Wednesday, August 12, 2009 3:26 PM
> To: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) Chargers (and winch)
> 
> On 11 Aug 2009 at 14:36, David Brandt wrote:
> 
> > With the modular chargers I am familiar with, they can
> be left plugged
> in,
> > which with an ET would probably mean for a week or
> so.
> 
> Careful!  No lead battery should be left on charge all
> the time.  
> 
> If the charger shuts off COMPLETELY when it's done, then
> yes, you can
> leave 
> it plugged in. Most don't really shut off, however, the go
> to low rate
> or 
> float charging.
> 
> For an application where the device is used regularly (even
> monthly),
> float 
> chargers and battery maintainers do more harm than
> good.  Safest policy
> for 
> long battery life : when the charge is finished, pull the
> plug.
> 
> 
> David Roden - Akron, Ohio, USA
> 
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