Re: External APC Batteries?

["Andy Whitfield" <andywhitfield2002@xxxxxxxxxxx>]

APC original batteries are usually CSB or Panasonic.  But can use=20
Yuasa NP.  Just make sure they are AGM type.
Andy
--- In ukha_d@xxxxxxx, "Jim" <jim@...> wrote:
>
> "Standard" automotive batteries (Flooded Lead Acid) don't
like deep
> discharge of <50% capacity, neither do they like standing for
long=20
periods
> as they are really designed to be shaken around, otherwise they=20
tend to
> sulphate particularly if being float-charged.
>=20
> Absorbed Glass Mat (AGM) type are better for standby use, IIRC=20
this is the
> technology used in Yuasa-type sealed lead acid batteries - the=20
sort used in
> UPS's.
>=20
> Squadron batteries have a good guide to the different types, life=20
and depth
> of discharge.
>=20
> http://www.energy-batteries.com/downloads/marine_rec_broch.pdf
>=20
> Their website also has info on chargers.
>=20
>=20
> As you have identified, the key is not to let the batteries=20
discharge too
> far and that could be managed through the UPS shutdown parameters=20
(i.e. shut
> off at 40% instead of runtime limit etc.)
>=20
>=20
> My opinion (and I'm sure Andy will confirm or rebuff this), is=20
that the
> replacement batteries sold by APC are exactly the same as the=20
Yuasa NP or
> NPL range, just with the relevant connectors etc. (which can be=20
removed from
> the existing cells) and an extortionate =A3lots price tag.
>=20
>=20
>=20
>=20
> Jim
>=20
>=20
> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On=20
Behalf Of
> Guy Clark
> Sent: 20 December 2007 18:13
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] External APC Batteries?
>=20
>=20
> HI, Jim!
>=20=20
> My biggest concern is the charging circuit...will it be up to=20
charging a
> pair of automotive-sized batteries instead of a pair of motorcycle-
sized
> batteries.   My guess is that if I don't let the batteries=20
discharge too
> far, there shouldn't be a problem.  If the charging circuit is=20
designed
> properly, I would expect it should charge any sized battery (of=20
the same
> chemistry and voltage (number of cells) ) but take longer for a=20
100AH
> battery than a 10AH battery (for example).
>=20=20
> I may just have to bite the bullet and get a pair of marine=20
batteries and
> hook them up in place of the original (dead) batteries and see=20
what happens!
>=20=20
> Thanx!!!
> Guy> To: ukha_d@xxxxxxx> From: jim@...> Date: Thu,=20
> Guy> 20 Dec 2007 18:02:32 +0000> Subject: RE: [ukha_d]
External=20
APC=20
> Guy> Batteries?> > Never done it (but considered it a few
time),=20
can't=20
> Guy> see there being a> problem in principle.> > A few=20
considerations.>=20
> Guy> > Make sure the cables, and particularly connectors, are
up=20
to the=20
> Guy> job as> there are a lot of amps flying around!> > You
will=20
need=20
> Guy> something to stop the batteries discharging into each other -
> Big=20
> Guy> diodes are harder to find and not cheap.> > The UPS
charger=20
is=20
> Guy> unlikely to be rated for more batteries (unless it's an>=20
expandable=20
> Guy> unit), so an external off-line system with a big changeover=20
relay>=20
> Guy> to connect the extra capacity might be an option.> >
> Jim>
>=20
> [Non-text portions of this message have been removed]
>