Today's Message Index:
----------------------
1. 08:07 AM - Re: Re: FYI: New kid in battery charger/maintainers (Robert L. Nuckolls, III)
2. 01:22 PM - Power Control for Heated Seats (Jeff Luckey)
3. 01:44 PM - Re: Power Control for Heated Seats (Charlie England)
4. 06:08 PM - Re: Power Control for Heated Seats (Robert L. Nuckolls, III)
5. 11:11 PM - Re: Power Control for Heated Seats (Jeff Luckey)
Message 1
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| Subject: | Re: FYI: New kid in battery charger/maintainers |
>>>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.
>
> Interesting observation which I've duplicated.
>
> With the charger plugged in and the battery fully
> charged, the device reverts to what may be their
> 'pulsed repair mode'. When attached to an 18 a.h.
> SVLA battery, the charger/maintainer settles
> pretty quickly into a pulsing activity that
> oscillates between 100 and 150 mA. I've left
> it connected to see what happens over the
> next few hours.
I rechecked the output signal from the
charger about an hour after it terminated
the top-off mode. The output was essentially
zero.
So aside from their claims to 'pulse', 'repair',
'desulfate', etc I can find no reason not
to recommend this product as a capable battery
charger/maintainer. Sadly tho, this product
will start to 'squeeze' Battery Tender sales
due to superior performance at a lower
price.
The sparks noted in an earlier post no doubt
are capacitor charging transients to be
expected as an artifact of internal circuitry.
Followup on Bobby's observation about
a Battery Tender that was too hot to
touch. A Battery Tender recharge experiment
conducted late yesterday terminated
after about 18 hours (yeah, that 0.7A
recharge can take some time with a big
battery). At no time did the BT surface
become more than slightly warm. I think
his BT is probably toast.
I have a stable of charger/maintainers
of various sizes and brands. Some of them
are 30 years old! I try to utilize all
of them in periodic rotation to confirm
functionality. The usual array of LED
indicators are not exactly 'calibrated'
displays!
I recently discovered one that was not
performing. A neighbor presented at my
shop with a dead utility battery discovered
when a vehicle jump-start was attempted.
Yeah, the battery was trashed and the
C/M proved to be the cause of the battery's
demise.
I've often suggested that batteries are
like house plants. Letting one sit in
solitary confinement for long periods
of time without periodic determination
of health for both battery and any
maintenance hardware is a recipe for
disappointment when failure goes undetected
and corrected.
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: | Power Control for Heated Seats |
Listers,
I want to have some control over the temperature of heated seats in an RV-1
4.
I am considering 2 types of circuit:1. a high-power linear regulator like a
LM138or2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving
an FET;=C2-
I don't think any kind of thermostatic control is practical or necessary (b
ut I'm open to suggestions).
The heater(s) consist of 2 pads, one for the seat and one for the lower bac
k.=C2- In total they draw 6 amps at 12v.
TIA,
Jeff LuckeyKCMA
Message 3
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| Subject: | Re: Power Control for Heated Seats |
On 8/20/2023 3:22 PM, Jeff Luckey wrote:
> Listers,
>
> I want to have some control over the temperature of heated seats in an
> RV-14.
>
> I am considering 2 types of circuit:
> 1. a high-power linear regulator like a LM138
> or
> 2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving an
> FET;
>
> I don't think any kind of thermostatic control is practical or
> necessary (but I'm open to suggestions).
>
> The heater(s) consist of 2 pads, one for the seat and one for the
> lower back. In total they draw 6 amps at 12v.
>
>
> TIA,
>
> Jeff Luckey
> KCMA
The ones (ama-bay specials) I bought for my RV6 came with variable
controls for each seat.
FWIW,
Charlie
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Message 4
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| Subject: | Re: Power Control for Heated Seats |
At 03:22 PM 8/20/2023, you wrote:
>Listers,
>
>I want to have some control over the temperature of heated seats in an RV-14.
>
>I am considering 2 types of circuit:
>1. a high-power linear regulator like a LM138
>or
>2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving an FET;
>
>I don't think any kind of thermostatic control is practical or
>necessary (but I'm open to suggestions).
>
>The heater(s) consist of 2 pads, one for the seat and one for the
>lower back. In total they draw 6 amps at 12v.
>
I've used these for fan motor control on
vehicles. The price is right and they're
pretty compact.
https://tinyurl.com/4caahvz4
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 5
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| Subject: | Re: Power Control for Heated Seats |
Bob,
Does the knob "click off"?=C2- It says something like that somewhere on t
he web page it's not exactly clear.
And you're right, at that price it would be hard to go wrong.... I've got a
couple of things around here that I would like to control the speed... and
a nichrome wire cutter, and a ...=C2-
Thx
On Sunday, August 20, 2023 at 06:20:18 PM PDT, Robert L. Nuckolls, III
<nuckolls.bob@aeroelectric.com> wrote:
At 03:22 PM 8/20/2023, you wrote:
Listers,
I want to have some control over the temperature of heated seats in anRV-14
.
I am considering 2 types of circuit:
1. a high-power linear regulator like a LM138
or
2. a low frequency (maybe 50 Hz) PWM circuit (maybe a 555) driving anFET;
=C2-
I don't think any kind of thermostatic control is practical or necessary(bu
t I'm open to suggestions).
The heater(s) consist of 2 pads, one for the seat and one for the lowerback
.=C2- In total they draw 6 amps at 12v.
=C2- I've used these for fan motor control on
=C2- vehicles. The price is right and they're
=C2- pretty compact.
https://tinyurl.com/4caahvz4
=C2-
=C2- Bob . . .
=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2
-=C2-=C2-=C2-=C2-=C2-////
=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2
-=C2-=C2-=C2-=C2-(o o)
=C2-=C2- ===========o00o=(_)=o00o====
=====
=C2-=C2- < Go ahead, make my day . . .=C2-=C2- >
=C2-=C2- < show me where I'm wrong.=C2-=C2-=C2-=C2-=C2->
=C2-=C2- ====================
============
=C2-
=C2-=C2- In the interest of creative evolution
=C2-=C2- of the-best-we-know-how-to-do based
=C2-=C2- on physics and good practice.
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