[time-nuts] UPS for my time rack

Alex Pummer 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...
73
KJ6UHN
Alex



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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