[time-nuts] The home time-lab

Mark Spencer mark at alignedsolutions.com
Fri Jul 8 14:18:31 EDT 2016

I also have had good results with various APC UPS systems.   

I typically have to replace the batteries in my UPS's and my stand alone backup batteries every 5 to 7 years or so.   Units such as the HP105B and FTS1050 that feature backup DC power inputs simplify the provision of long term backup power in my experience.   

Last summer we had a two day power outage when I was away (so my generator sitting in the garage was of no use.)  My 100 amp hour battery system kept my HP105B and FTS1050 running while everything else lost power.  On occasion I've run my BVA from the battery system as well.   Using my HP5370's I've never been able to detect a difference in performance of my OCXO's running on battery power vs AC line power (or DC supplied from an HP linear supply in the case of the BVA.)

All the best
Mark Spencer

Sent from my iPhone

> On Jul 8, 2016, at 8:23 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> David wrote:
>> This is the only deal I see at the moment but I do
>> not know how suitable it would be and it is more
>> than I paid although about twice as powerful:
>> http://www.upsforless.com/apcsurta1500xlref.aspx
> I have a fleet of its bigger brothers, the 2000XL and 2200XL, and recommend them highly.  The conversion engines are rated for continuous duty, so you can add as many extra battery packs as you like to extend the run time (most UPSs designed for home use -- even very expensive ones -- do not have enough cooling to run continuously, so they depend on the battery going dead to keep them from burning down).
> That price is not bad, IMO, if they come with fresh, GOOD QUALITY batteries. I strongly advise NOT using the generic black Chinese batteries -- IME, they are worthless crap. If you live somewhere you can get genuine Panasonic SLA batteries, use those [but BEWARE of fakes!!]. Here in the US, the PowerSonic SLAs are the best I've found.  I get mine from "ecomelectronics" on ebay [no affiliation, just a satisfied customer].
> I have had no RF interference issues, or any other problems other than bad, generic black Chinese batteries.  The APC supplies are rugged and well-protected -- one battery pack I hadn't rebuilt (full of the generic black batteries) failed in a spectacular fashion (sparks and smoke and melted plastic *from the batteries*).  The UPS itself suffered no damage.
> Best regards,
> Charles
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