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Re: [EVDL] LED Taillights - a money saver in gas cars? ->rangeextenderin EV's? - an a

PC switchmodes almost always have capacitor voltage doublers on the input
(split rail). That means they probably need a minimum of 250ish volts to
start properly (assuming they'll run with Japan-Spec AC).

There are plenty of surplus 12v supplies that are only designed for US spec
and don't use doublers, so that means they are designed to run at ~150VDC
but will probably start at around many pack voltages.

Remove the bridge rectifier and AC input filter stages and you have a nice
DC supply for your EV.

It's usually pretty trivial to adjust a 12v supply up to 14v without too
much trouble.

-Phil
----- Original Message -----
From: "Marty Hewes" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Wednesday, September 26, 2007 7:47 AM
Subject: Re: [EVDL] LED Taillights - a money saver in gas
cars? ->rangeextenderin EV's? - an analysis PC Power Supply


> The PC supply I'm looking at here does 25 amps at 12 volts (300 watts),
> and
> it's better than average. I don't know what it would take to raise the
> voltage, control overcharging, and make it run off of a DC input. Maybe
> it
> could supplement the aux battery, maybe with the addition of some
> alternator
> regen during deceleration, to the point a large DC/DC is not required.
> Might be able to find a 12 volt only "brick" type supply surplus
> someplace.
>
> Marty
>
> ----- Original Message -----
> From: <[email protected]>
> To: "Electric Vehicle Discussion List" <[email protected]>
> Sent: Wednesday, September 26, 2007 8:53 AM
> Subject: Re: [EVDL] LED Taillights - a money saver in gas cars? -
> >rangeextenderin EV's? - an analysis PC Power Supply
>
>
>> down from 530 watts to 440 watts...
>> Now we're talking about "pc power supply" range for $50 bucks, rather
>> than
>> expensive $250+ DC/DC converters...
>> What do you folks think?
>>
>> Has anyone used a cheap pc-power supply rather than a DC/DC converter -
>> to
>> recharge their 12-volt aux battery?
>> Do you think it would hold up?
>>
>> Ed Cooley
>>
>>
>>
>>
>>
>>
>>
>> "Adrian DeLeon" <[email protected]>
>> Sent by: [email protected]
>> 09/25/2007 23:37
>> Please respond to
>> Electric Vehicle Discussion List <[email protected]>
>>
>>
>> To
>> [email protected]
>> cc
>>
>> Subject
>> Re: [EVDL] LED Taillights - a money saver in gas cars? - >rangeextenderin
>> EV's? - an analysis
>>
>>
>>
>>
>>
>>
>> Around and around we go...
>>
>> The one big plus for LED lighting is the possibility of using a
>> smaller/less expensive DC/DC converter.
>>
>> Headlight on HI = 130W
>> Heater fan HI = 250W
>> Misc 12V = 60W
>> TOTAL SO FAR = 440W
>>
>> 4 marker lights = 5W x 4 = 20W
>> 4 turn signals = 27W x 4 = 100W (intermittent - can use "peak power" from
>> DC/DC)
>> 2 brake lights = 27W x 2 = 50W
>> 2 tail lights = 5W x 2 = 10W
>> Center brake light = 5W = 2 = 10W
>> TOTAL LIGHTING = 90W/190W (intermittent)
>>
>> So LEDs can reduce your DC/DC requirements from 530W to 450W.
>>
>> Adrian
>>
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