[tcb] Re: Batteries (again)
- From: <bustravler@xxxxxxx>
- To: tcb@xxxxxxxxxxxxx
- Date: Mon, 20 Oct 2008 13:48:58 -0400
Gerald,
I am curently in South Africa and need to unsubscribe to the list as my mail
box is getting overloaded. I tried the conventional means to no avail.
Thanks,
Leo
---- "Gerald V. Livingston II" <gerald.tcb@xxxxxxxxxxxxx> wrote:
> What Denis said.
>
> These are for running auxiliaries for long periods of time. The 4 orange
> batteries in the Rivi will run my radio at "reasonable" volume for
> somewhere between 2 and 4 days. If I crank it up they're good for
> somewhere between 12 and 24 hours.
>
> Real life example (and the main reason I'm looking for more).
>
> I have a 3000Va UPS hooked up to a bunch of my servers in the office. It
> uses a 48V inverter so, 4 batteries. The original batteries that came
> from the manufacturer were 17Ah batteries. The literature for the unit
> said we would get approximately 30 minutes of standby power at *half*
> load or 10 minutes at FULL load --- those "4-packs" of 17Ah batteries
> cost about $200 each and the boss bought 4 of them to extend the run
> time to about 90 minutes (it's not a linear thing and takes an engineer
> to explain 4x batteries = 3x run time).
>
> Those little batteries are good for about 3 years. When they died he
> bought complete new UPS units that use *10* batteries each but only use
> 5Ah batteries. I have exactly 10 of the orange batteries still and I
> want to put those on one of the newer UPS units then go with 4 of the
> bigger batteries in the old UPS and 3 in the Bus.
>
> Anyway, I took the old 48V UPS and installed 4 of the 92Ah orange
> batteries -- remember, original spec called for 30 minutes at *half*
> load. We grabbed a 1500 watt electric space heater and plugged it in
> plus a few other random devices. Completely maxed out the load meter.
> After listening to the UPS beep at us for 2.5 hours running that heater
> we finally plugged it back into the wall to make it shut up (I later
> disconnected the beeper and replaced it with a flashing light). The
> battery meter showed that the batteries were only about half depleted so
> I'm figuring between 4 and 5 hours at FULL load and 10 or 12 hours at
> HALF load.
>
> I have a small, cheap, Energizer brand 650Va (about 350 watts) UPS
> installed in my office with a single orange battery attached. It will
> run 2 computers and a monitor at least 3 hours. the original package
> said 15 minutes at half load 5 minutes at full load.
>
> These are deep cycle batteries made to run at near full voltage right up
> to the point where they die. And they are designed to be run completely
> dead over-and-over. If you drain your car battery more than a few times
> it will start to lose capacity quickly and will be garbage in a year.
> Car batteries, if you can find an actual Ah rating in the specs (because
> that's not what they're designed for, you'll usually find CCA and
> "reserver capacity") are usually rated between 40 and 50 Ah. The orange
> batteries I sold are 92Ah and these new ones are 120Ah.
>
> I use one of the orange batteries and a 750Watt inverter to make coffee
> at campouts. At the classic I forgot my single-battery charger and it
> did fine making 2 pots a day for the whole weekend. My coffee pot has a
> 750 watt element so it's drawing whatever the max amperage is for hat
> inverter.
>
> OK, got me rambling. I quit now.
>
> Gerald
>
> Brian Denning wrote:
> > are you serious??? did i read that right $275 for a car battery???
> >
> > guess i'm a cheapo. my duralast powers my radio for 2 days constant with
> > quick start up after that...why would you need to spend that kind of
> > money on a car battery???
> >
> > ridiculous in my book...i have better things to buy with that kind of
> > money...sorry, just my .02
> >
>
>
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