Re: [EVDL] siingle cell capacity tester

Cor van de Water wrote: It is rather simple to find out, since we had the same "feature" on the US Electricars. Does the charger draw a very significant amount of power (in the order of 500+ Watts) when delivering "no" power to the batteries? That is the loss in the motor inductor. mostly due to

Re: [EVDL] siingle cell capacity tester

7626Tel: +91 (040)23117400 x203 -Original Message- From: ev-boun...@lists.evdl.org on behalf of Lee Hart Sent: Sat 4/26/2014 11:32 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] siingle cell capacity tester phil hochstetler wrote: > My Twike has an AC induction m

Re: [EVDL] siingle cell capacity tester

phil hochstetler wrote: My Twike has an AC induction motor and the controller and charger are one unit the size of a toaster. It was built in 1998. I wonder if they are using the motor-as-an-inductor trick? On an AC motor, running chopped DC through a winding won't make it run. In fact, it w

Re: [EVDL] siingle cell capacity tester

My Twike has an AC induction motor and the controller and charger are one unit the size of a toaster. It was built in 1998. Phil H. On Apr 26, 2014 12:24 PM, "Lee Hart" wrote: > Lee Hart wrote: > >> As for using a motor controller as a battery charger: That is a much >>> trickier proposition. A

Re: [EVDL] siingle cell capacity tester

Lee Hart wrote: As for using a motor controller as a battery charger: That is a much trickier proposition. A battery has very low resistance, and can deliver awesome peak currents! Few motor controllers are going to like powering a battery directly. To do it, they would need a substantial output

Re: [EVDL] siingle cell capacity tester

On Fri, Apr 25, 2014 at 6:48 PM, Lee Hart wrote: > As for using a motor controller as a battery charger: That is a much > trickier proposition. A battery has very low resistance, and can deliver > awesome peak currents! Few motor controllers are going to like powering a > battery directly. To do i

Re: [EVDL] siingle cell capacity tester

Dennis Miles wrote: Lee Hart, I have great respect for you and your opinion. I would admonish anyone not to go and try using a motor controller for a battery charger without ascertaining the exact design parameters it is capable of. Every model is usually different and some are capable of batte

Re: [EVDL] siingle cell capacity tester

Lee Hart, I have great respect for you and your opinion. I would admonish anyone not to go and try using a motor controller for a battery charger without ascertaining the exact design parameters it is capable of. Every model is usually different and some are capable of battery charging right off o

Re: [EVDL] siingle cell capacity tester

On 04/25/2014 04:34 PM, Lee Hart wrote: Dennis Miles wrote: The circuit of the motor controller makes a difference. The old SCR controllers needed the inductive CEMF kick to assure switching, Modern IGFET power transistors do not. so they can act as battery chargers. I've actually observed ju

Re: [EVDL] siingle cell capacity tester

Dennis Miles wrote: The circuit of the motor controller makes a difference. The old SCR controllers needed the inductive CEMF kick to assure switching, Modern IGFET power transistors do not. so they can act as battery chargers. I've actually observed just the opposite with the controllers I've

Re: [EVDL] siingle cell capacity tester

The circuit of the motor controller makes a difference. The old SCR controllers needed the inductive CEMF kick to assure switching, Modern IGFET power transistors do not. so they can act as battery chargers. *Dennis Lee Miles * *Director **E.V.T.I. Inc.* *E-Mail:* *evprofes...@evprofessor.co

Re: [EVDL] siingle cell capacity tester

EVDL Administrator wrote: Don't you need inductance in the load for a DC controller's current limit to function? If so, you'd have to manually monitor the current carefully, no? As long as your load has enough resistance to limit the current to something under the controller's current limi

Re: [EVDL] siingle cell capacity tester

Your local Freecycle.org is another source for the heaters. Totally free for the asking :-) hg - Original Message - From: Jan Steinman To: ev@lists.evdl.org Sent: Fri, 25 Apr 2014 12:02:00 -0600 (MDT) Subject: Re: [EVDL] siingle cell capacity tester > From: Lee Hart > > Mic

Re: [EVDL] siingle cell capacity tester

> From: Lee Hart > > Michael Ross wrote: >> Doubtful you can buy it, but you can make one. I am in the process myself. >> Sure you want to do this at home? This much power is non-trivial. Be >> wary. > > A single cell isn't too bad. Doing a whole pack gets into high power > territory. Dependin

Re: [EVDL] siingle cell capacity tester

On Fri Apr 25 10:36:58 PDT 2014 evp...@drmm.net said: >On 25 Apr 2014 at 10:25, Lee Hart wrote: > >> For the pack as a whole, you can use your car's motor controller as an >> adjustable resistor. It can drive a resistive load just as well as an >> inductive load (the motor). > >Don't you need induc

Re: [EVDL] siingle cell capacity tester

On 25 Apr 2014 at 10:25, Lee Hart wrote: > For the pack as a whole, you can use your car's motor controller as an > adjustable resistor. It can drive a resistive load just as well as an > inductive load (the motor). Don't you need inductance in the load for a DC controller's current limit to f

Re: [EVDL] siingle cell capacity tester

Peakfoto Digital Photo Still n Video wrote: For the pack as a whole, you can use your car's motor controller as an adjustable resistor. It can drive a resistive load just as well as an inductive load (the motor). Disconnect the motor, and connect your load resistor in its place. Use the throttl

Re: [EVDL] siingle cell capacity tester

Lee Hart wrote: I have an MRC-89 Superbrain battery tester. It is built for R/C cells and batteries up to 20aH. These sell for about $100. It can test higher-capacity cells, but its amphour counter will "roll over" from 199.99ah to 0 so you have you have to add the excess beyond this. Correctio

Re: [EVDL] siingle cell capacity tester

For the pack as a whole, you can use your car's motor controller as an adjustable resistor. It can drive a resistive load just as well as an inductive load (the motor). Disconnect the motor, and connect your load resistor in its place. Use the throttle to control the battery current. This ha

Re: [EVDL] siingle cell capacity tester

Michael Ross wrote: Doubtful you can buy it, but you can make one. I am in the process myself. Sure you want to do this at home? This much power is non-trivial. Be wary. A single cell isn't too bad. Doing a whole pack gets into high power territory. Power = volts x amps. For power under 1000

Re: [EVDL] siingle cell capacity tester

westmountainradio.com CBA IV  Works well.  I have one.  Fairly automatic, I guess.  Holds constant current and shuts off at LVC.  -- next part -- An HTML attachment was scrubbed... URL:

Re: [EVDL] siingle cell capacity tester

On 04/25/2014 07:54 AM, Adrian DeLeon wrote: Have a look at the iCharger units made for RC packs. Just noticed in the manual that a "forming charge" for NiCad/NiMH is limited to 9.9 AHr, and the portion of the display for measuring mAHr is 5 digits, implying a 99,999 mAHr limit before someth

Re: [EVDL] siingle cell capacity tester

Peakfoto Digital Photo Still n Video wrote: Is there an atuomatic siingle cell LFP cycling capacity tester ? out there .. Like an RC hobby gadget that would work with even a 40ah to 150 ah cell, $100 or less, maybe 5 - 20 amps, so it could work, maybe 2 to 24 hours, and would digitally

Re: [EVDL] siingle cell capacity tester

Have a look at the iCharger units made for RC packs. The charge/discharge/cycle modes show elapsed time, charge current, and total mAHr. The iCharge 206B that I have is $112 at www.hobbyking.com Note: all iChargers require an EXTERNAL DC POWER SUPPLY, and the power supply voltage may limit the

Re: [EVDL] siingle cell capacity tester

Doubtful you can buy it, but you can make one. I am in the process myself. Sure you want to do this at home? This much power is non-trivial. Be wary. You can see Jack Rickard doing a high C discharge in a video from last fall, 1000Amps. (EVTV Motor Verks http://www.evtv.me.s3-website-us-east-

[EVDL] siingle cell capacity tester

Is there an atuomatic siingle cell LFP cycling capacity tester ? out there .. Like an RC hobby gadget that would work with even a 40ah to 150 ah cell, $100 or less, maybe 5 - 20 amps, so it could work, maybe 2 to 24 hours, and would digitally tell you, your AH capacity ? Itd be nice to h