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Re: [EVDL] Ranger Conversion Amps & Warm Motor Okay?

Tom (and Bob, Roland and all),

Thanks for all your comments. I'm still catching up on my e-mail after a business trip last week so sorry for the delay in responding. From Tom's comments, it sounds like you've been there because of how you describe driving an electric Ranger (including living at the top of a goo incline/hill). The more I drive the more I see the same characteristics that you mention.

My goal is to commute to work summer & winter through 22 miles of hils and valleys. My boss just gave me the okay to "fill up" while at work so that's a plus. I'm holding off making the trek until I buy and install my on-board charger (hard to find a 240v range plug when you need one!).

When I layed out my first components board (controller, fuzes, wiring, etc) I was expecting to relay it out after I got all the components in it. Your suggestion of monitoring motor current rather than battery current is a good one. I'll include that in the next layout.

In fact, I just brought home two resistors from work today to check out clearing the "Check Gages" light. By having 1) some value for gas (resistor #1) , some value for engine temp (resistor #2) and grounding the Oil Pressure line, the "Check Gages" light went out (Yea!). Knowing that that worked, I'll connect the 230C ADC 9" motor switch across the resistor so that the instrument panel "Check gages" light will light and the Temp gage will go to max when the engine gets hot. (I still need to play with making the fuel gage read my SOC while electrically isolated from the traction batteries.) And I think I'll make the "Oil Pressure" gage indicate normal when my DCP controller completes it's Built In Test Cycle and passes a ground to the 2nd relay.

Anyway, thanks for all your comments. I really appreciate hearing what others have experienced with these EVs!

Dave O
98 Ranger (in 07!)


----- Original Message ----
From: Tom Shay <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Tuesday, September 18, 2007 11:07:30 PM
Subject: Re: [EVDL] Ranger Conversion Amps & Warm Motor Okay?


I had a Ranger EV conversion with a 9-inch ADC motor, 120-volt batery pack
and 500-amp controller. That truck was slow as I'm sure yours is. My
Ranger
couldn't be hurried to accelerate from a stop or to climb a hill without
rapidly
heating the motor.

You should be measuring motor current, not battery current. To keep the
motor
temperature reasonable, keep the motor rpm up and the motor current under
300
amps. If that means that drivers behind you are extremely distressed, so be
it. You
have to decide whether you want your motor to live or whether you want to
accelerate and climb with the fast traffic. I got used to climbing hills at
half the speed
of the others as I hope you will.

I live on a hill and the last half mile coming home is
uphill and steep. I climbed that hill in 1st gear at about 200 amps and
15mph which was
plenty with a hot motor and a tiring battery pack. I could have climbed in
2nd gear
at about 25 mph and 350-400 amps but I wanted to spare the motor and
batteries.
My next door neighbor with an F-150 would tease me about my slow truck.

----- Original Message -----
From: "Dave Oliveria" <[email protected]>
To: <[email protected]>
Sent: Tuesday, September 18, 2007 6:07 PM
Subject: [EVDL] Ranger Conversion Amps & Warm Motor Okay?


> Good EVening, EVeryone;
>
> I have two questions about what's typical in amp draw and a warm motor
> when I drive. I just got my Ranger EV conversion to run two Mondays ago.
> Since then I've been taking several runs including longer drives to
> determine range.
>
> Q1 - I'm noticing that I seem to consistently draw from 200 to 450 amps in
> each gear (2nd, 3rd, 4th) to get up to speed and in climbing hills (and
> sometimes I'm still not going the posted speed limit). I appear to
> maintain 50mph at 100amps. Is this normal?
>
> Q2 - My 9" ADC motor smells like it's warming up the windings after each
> trip. I've felt for temp and it's been warm. Today it was down right hot
> to the touch after a 8-mile trip to town and back. I put a meter on the
> temp switch pigtails after I got home to make sure that they weren't
> closed (indicating a high-temp condition). Is this high temp thing
> normal?
>
> Thanks for your guidance in advance!
>
> Dave "Still EV Grinning" O
> _______________________________________________
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> http://lists.sjsu.edu/mailman/listinfo/ev
>


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