---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 08/20/23: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 08:07:08 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:22:40 PM PST US From: Jeff Luckey Subject: AeroElectric-List: 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 _____________________________________ Time: 01:44:24 PM PST US Subject: Re: AeroElectric-List: Power Control for Heated Seats From: Charlie England 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 -- This email has been checked for viruses by Avast antivirus software. www.avast.com ________________________________ Message 4 _____________________________________ Time: 06:08:26 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 11:11:33 PM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: 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 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.