Today's Message Index:
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1. 12:12 PM - Re: Next generation Crowbar OVM (Robert L. Nuckolls, III)
2. 12:57 PM - FYI: New kid in battery charger/maintainers (Robert L. Nuckolls, III)
3. 05:27 PM - Re: FYI: New kid in battery charger/maintainers (user9253)
4. 08:35 PM - Re: Re: FYI: New kid in battery charger/maintainers (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Next generation Crowbar OVM |
>>Thanks Bob, that's a handy device if one doesn't happen to have a
>>zener on hand with desired voltage, even if it doee require two resistors.
best yet, they're really cheap and
0.5% tolerance. Vcc is generally
tight enough to serve both as power
and reference.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 2
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| Subject: | FYI: New kid in battery charger/maintainers |
Over the past few months I've had numerous occasion
to do some flat-battery charging as well as verify
functionality of a stable of charger/maintainers.
For decades I've enjoyed the predictable performance
of the Battery Minder and Battery Tender 'wall warts'.
Still have 4 or 5 in service. However, the cost
of these devices has moved steadily up . . . and
up.
Some months ago, I picked up a couple of these
critters:
https://tinyurl.com/3krjhuy8
The price is certainly attractive and less
than the 'wall warts'. Further, while the
wall wart charge rate was on the order of
0.8 to 1.0 amps, this device claims 10A!
Over the past few days I've verified this
performance on LA flooded, SVLA and
LiFePO4 chemistries. One is justifiably
wary of claims for 'repairing' or 'desulfating'
a battery.
I think I've cited The Battery University
several times in the past as a golden
source for information on battery technologies,
utilization and performance. As a refresher,
I'll cite one of many articles on that site;
this one specific to sulfation issues:
https://tinyurl.com/BatterySulfation
So, just ignore those claims for battery
resurrection/salvation and know that
these are a good value in charger/maintainers.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 3
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| Subject: | Re: FYI: New kid in battery charger/maintainers |
I purchased a similar one of those chargers.
Pros:
Charges quickly, up to 8 amps.
_
Cons:
The wires are too short, only a couple of feet long.
The wires are stiff, might be stranded but not very many strands.
When clamping onto a battery, a spark jumps. That tells me that the charger
is drawing power from the battery before the AC cord is plugged in.
An internal fan runs while charging.
I would not trust leaving the charger connected overnight.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511294#511294
Message 4
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| Subject: | Re: FYI: New kid in battery charger/maintainers |
At 07:26 PM 8/17/2023, you wrote:
>
>I purchased a similar one of those chargers.
>Pros:
>Charges quickly, up to 8 amps.
>_
>Cons:
>The wires are too short, only a couple of feet long.
>The wires are stiff, might be stranded but not very many strands.
>When clamping onto a battery, a spark jumps. That tells me that the charger
>is drawing power from the battery before the AC cord is plugged in.
Did you measure-to-confirm? Might just be a
capacitor across the output of what must
be a switch-mode power supply. I'll check
the one that's still here in the morning.
>An internal fan runs while charging.
Yeah, that's a 100+ watt power supply
in that little package. Simple convection
venting would be inadequate. Adding a
thermostat to shut it off except when
needed would add to complexity.
>I would not trust leaving the charger connected overnight.
I've conducted numerous charge cycles with
these on a constellation of batteries. They
have behaved as expected. They are advertised
as 'maintainers' which tells us they're intended
for long term service powered up.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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