[time-nuts] UPS for my time rack
alex at pcscons.com
Sat Oct 10 12:31:49 EDT 2015
for a very similar application I am using a solar panel to charge the
battery, but I have a vented NiFe battery, which is not sensitive of
over charging or deep discharging, and has almost unlimited life time --
I have seen some in forklifts which were 60 years old and working...
On 10/10/2015 7:14 AM, Poul-Henning Kamp wrote:
> In message <1444483218108.6a07c91c at Nodemailer>, "Chris Waldrup" writes:
>> Has anyone had bad experience noise wise with the APC brand units
>> like are available on Amazon and at Staples? I'd like to get one
>> that doesn't generate lots of RFI. Thank you.
> Then don't.
> Instead get 12 or 24 Volt sealed lead-acid batteries and a good
> float-charger, and run your stuff from that.
> You avoid a lot of conversion losses, and you get to decide what
> quality batteries you want (As opposed to "the cheapest we can get
> away with") and you get to decide how long hold-up time you want.
> The important tricks are:
> 1. ATO Fuse *RIGHT NEXT TO THE BATTERY*. Not a meter away, but
> quite literally bolted right onto the terminal.
> 2. Don't buy a shit charger, it will cost you battery life.
> 3. Suitably sized fuse/polyfuses on all loads.
> 4. Either put 0.010 Ohm current shunts in all over the place
> or buy a 1mA resolution clamp meter and prepare the wiring
> for measurement.
> And that's it really...
> I run all the always-on stuff in my lab from two 12V/105Ah telco-grade
> sealed lead-acid batteries, and I'll never look back.
> Presenty the load is 6.7A @ 24V, and that powers my ADSL lines,
> firewalls (soekris), home server (ITX with mini-box.com PSU),
> emergency lights (LED strips), GPS, GPSDO, HP5065 etc. etc.
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