Hi Attila:
The difference in chemistry I got from "Handbook of Batteries" 3rd ed, 2001. Your comments about modern chargers are
correct, but this thread is about the HP 105 which uses what we both might call an old fashioned charging circuit.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
h
On Sat, 17 Sep 2016 12:03:47 +0200
Attila Kinali wrote:
> Hence people
> were adviced to use only NiCd fast-chargers which had a temperature sensor.
Addendum: The other "classical" NiCd fast-charger architecture used
the fast rise in temperature when the battery was full to detect
end of charge
On Fri, 16 Sep 2016 11:37:23 -0700
Brooke Clarke wrote:
> The chemistries are very different. Ni-Cad is endothermic whereas Ni-MH is
> Exothermic. This is why chargers for Ni-MH
> have a mandatory temperature sensor. This is one of the reasons I say Ni-
> Cad cells batteries are easy to charg
It has been my experience that both chemistries have thermal cutouts for
overcharge limiting and both can use chargers that detect the negative
voltage slope when the cells heat up once they are fully charged, hence
the ability to use the same chargers for NiCd and NiMH. I have many
radios tha
I have a pair of Liebert GTX2-700RT online UPSes and they work well; I
just replaced the batteries, lubricated the fans, and cleaned the dust
out of them a couple weeks ago. They have that sort of standard 4
prong socket on the back for external batteries.
But unlike my two Powerware Prestige EXT
High end standby UPSes support external batteries but most or all
online UPSes do. I have 3 different online UPS models and they all
support external batteries of either 48 or 60 volts.
On Thu, 15 Sep 2016 15:13:59 -0700, you wrote:
>Since I have a 12V 100 A-H gelled electrolyte battery as a
>sh
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Hi David:
The chemistries are very different. Ni-Cad is endothermic whereas Ni-MH is Exothermic. This is why chargers for Ni-MH
have a mandatory temperature sensor. This is one of the reasons I say Ni-Cad cells batteries are easy to charge.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
ht
Hi
Any time you get into UPS designs, they are all over the map …
> On Sep 16, 2016, at 1:01 PM, Gary E. Miller wrote:
>
> Yo Hal!
>
> On Fri, 16 Sep 2016 00:50:56 -0700
> Hal Murray wrote:
>
>> g...@rellim.com said:
>>> APC UPS can't handle the longer runtime, but never had a problem
>>> wi
Yo Hal!
On Fri, 16 Sep 2016 00:50:56 -0700
Hal Murray wrote:
> g...@rellim.com said:
> > APC UPS can't handle the longer runtime, but never had a problem
> > with any version of CyberPower.
>
> There are two parameters for UPS boxes. One is the power the
> electronics can handle. The other
Actually the larger SmartUPS series can run for hours providing a large enough
battery string is available I have a SmartUPS RM3000 running data rack this
has 2 external battery boxes and will run everything for 6 hours.
For TimeNuts applications though I'd recommend a Liebert UPS as this i
g...@rellim.com said:
> APC UPS can't handle the longer runtime, but never had a problem with any
> version of CyberPower.
There are two parameters for UPS boxes. One is the power the electronics can
handle. The other is the amount of energy the batteries can hold.
I think some of the smalle
sday, September 15, 2016 at 7:12 PM
> > From: "Andy ZL3AG" >
> > To: "Discussion of precise time and frequency measurement" <
> time-nuts@febo.com >
> > Subject: Re: [time-nuts] HP-105B Battery Replacement?
> >
> >
> > If you know where
NiMH batteries are close the same voltage and charge the same as NiCd
and are more available and not toxic when disposing of them. They should
be a good replacement. Lithiums are very different in voltage and charging.
David N1HAC
On 9/14/16 10:19 PM, Jeremy Nichols wrote:
Thanks, Brooke, I'
sion of precise time and frequency measurement"
>
> Subject: Re: [time-nuts] HP-105B Battery Replacement?
>
>
> If you know where to get them from, you can get used 19" rack mount UPS's for
> scrap value. They might have fried batteries, but that's easil
In my experience the commonly seen UPS's that support external batteries expect
you to use the batteries supplied (or at least specified) by the manufacturer.
That being said I have come across UPS systems that are designed to work with
generic user supplied 12 volt batteries but in my expe
If you know where to get them from, you can get used 19" rack mount UPS's for
scrap value. They might have fried batteries, but that's easily solved.
On 16/09/2016, at 11:06 AM, Bob kb8tq wrote:
> Hi
>
> They are very common when you look at server UPS or larger units. There are
> literally
Hi
They are very common when you look at server UPS or larger units. There are
literally hundreds of models to pick between. Prices are from roughly $400 up
to a few hundred thousand dollars per unit.
Bob
> On Sep 15, 2016, at 6:13 PM, Jeremy Nichols wrote:
>
> Since I have a 12V 100 A-H gel
APC has made UPS that take both internal and external batteries.
My house runs on a 2KW APC in bad times and they seem to run just fine.
Granted the battery is a drop bigger then we are speaking of here and I use
a separate 55 amp precision charger. Love that telco stuff.
But these are the serious
Look for a POWERVAR model ABCE150-11M2. It has an IEC plug and
connector for 120 Volt in and out along with a yellow SB-50 connector
for the 12 VDC battery connector. Compatible with LiFePO4 and SLA
battery chemistries
On 9/15/2016 6:21 PM, Mark Spencer wrote:
They do exist. I've seen
Yo Jeremy!
On Thu, 15 Sep 2016 15:13:59 -0700
Jeremy Nichols wrote:
> I'd like to find a UPS that uses an external battery. So
> far I don't see such a thing--do they exist?
Not in the store, but they are easy to make. I take consumer grade
CyberPower sine wave supplies. Remove the expensive
Thanks I was aware of Ni Fe batteries but have never seen them for sale at the
local "battery store" where I buy batteries for my vehicles, time nuts and
amateur radio pursuits (:
I view lead acid batteries (especially ones designed for in door use) as semi
expendable for my various hobbies.
They do exist. I've seen them in service at Telecom sites outside of the U.S.
and Canada. I believe there was a thread re this a few years ago ?
Sent from my iPhone
> On Sep 15, 2016, at 3:13 PM, Jeremy Nichols wrote:
>
> Since I have a 12V 100 A-H gelled electrolyte battery as a
> short-t
Since I have a 12V 100 A-H gelled electrolyte battery as a
short-term backup (for those outages not worth firing up the generator),
I'd like to find a UPS that uses an external battery. So far I don't see
such a thing--do they exist?
Jeremy
On Thursday, September 15, 2016, Bob Camp wrote:
> Hi
if you deep discharge led acid batteries -- which are not made special
for deep discharge -- you will have to replace them quite often, on the
other hand Ni-Fe batteries you could short out, overcharge they are
undisrtuktable that is the reason why they are not produced any more in
the US, they
Hi
It’s been quite a while since I bought anything other than a pure sine UPS.
They really aren’t as expensive
as they once were. You may find them a bit cheaper from outfits like CyberPower
than from APC. Sometimes
it s a bit tough to work out exactly what is or is not a pure sine wave unit.
Hi I've run my HP105B (with the old style oscillator) from AC power via a
consumer grade UPS, 24 Vdc from a lead acid battery bank and briefly from the
internal battery pack with out any notable changes in performance (that being
said I can't measure phase noise so this observation may or may no
Your point is well made. My question is: what happens to the quality of
the output sine wave if I use anything other than a true sine-wave
(i.e., expensive) UPS? Most of them these days produce a semi-sine wave
(aka modified square wave) that may or may not play well with the 105B.
Anyone have
Brooke, I priced Ni-Cds and was not happy with the numbers: a set of 20
D-size cells will cost me ~US$100 by the time I get them delivered. That
plus the 8-pound weight penalty makes replacement Ni-Cd cells
unattractive. (105A = 16 pounds, 105B = 24 pounds including the battery
box and charging
I had my local BatteriesPlus rebuild my pack for my 105B about 4 years ago and
it's still working well as I recall the cost was about 175. But I specified use
best quality cells. Plus they have the proper battery welder and test gear and
they have more vendor clout to get consistently good cell
Brookes comments are the facts you can not use simple charging circuits.
But smart charging circuits seem to be available on various sites for low
cost. It seems the RC modelers have helped us out.
The thing I will say is I have ordered new nicad C cell batteries from
major a major vendor and they
Hi
A bigger question becomes:
Do batteries inside equipment make much sense anymore?
These days, a UPS is often a standard part of a rack in an outage prone area.
Powering
the “whatever” instrument off of the same UPS as the rest of the stuff is one
obvious
answer.
The other answer is an ev
Hi Jeremy:
I'm currently having fun playing with various rechargeable battery related
stuff which includes Li-Ion cells.
http://www.prc68.com/I/BatTst.shtml#Resistor
The cells come in three configurations:
1. the raw flat top cell with optional tabs to allow easy soldering into a pack,
2. cell
Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel
cells) but rather lithium rechargeable, providing I can find a type that
won't catch fire and will work with the 105B'scircuits.
Jeremy
On Wednesday, September 14, 2016, Brooke Clarke wrote:
> Hi Alex:
>
> Yes, I'm rec
Hi Alex:
Yes, I'm recommending Ni-Cad but NOT any acid type.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
Original Message
Hi Brooke,
sorry I have to disappoint you; Ni-Cd batteries do
Hi Brooke,
sorry I have to disappoint you; Ni-Cd batteries do not use any acid,
they have K-OH kalium hidrioxid [potassium hydroxide for anglophone ]
as electrolyte and they are normally very air-tide, and widely used in
radios.
73
KJ6UHN
Alex
On 9/14/2016 4:45 PM, Brooke Clarke wrote:
Hi Jeremy:
It's a very bad idea to put any battery with acid in an enclosure that has electronics since if it vents the acid will
etch the PCBs.
Guess how I learned this. I got a great price on a Gibbs Frequency Standard
because the oven no longer worked.
http://prc68.com/I/office_equip.html
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