Re: [EVDL] Slow due to 96V pack?

From: paul dove via EV >Great then explain (96-72) x .08 = 300 amps. That should be (96v-72v) / .08ohms = 300 amps. This is just Ohms law. 96v is the unloaded battery pack voltage. 72v is the pack voltage under load. 0.08 ohms is the ESR. So with a load of 300a, the pack

Re: [EVDL] Slow due to 96V pack?

ffer. > Cor. > > -Original Message- > From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of paul dove via EV > Sent: Thursday, September 14, 2017 11:10 AM > To: Roger Stockton; Electric Vehicle Discussion List > Cc: paul dove > Subject: Re: [EVDL] Slow due to 96V pack? &g

Re: [EVDL] Slow due to 96V pack?

From: paul dove via EV >There is no voltage adjustment on input voltage in any motor controller I ever >used. Interesting. What motor controllers have you used? Every controller I've used *has* had a low-voltage cutout. That includes everything from the venerable GE EV1,

Re: [EVDL] Slow due to 96V pack?

On 9/9 I wrote: >>> I seem to recall that the minimum input voltage for a Zilla is 72 volts. Might be sagging the pack to 72 volts and that is that is simply amps it puts out at that voltage. >>> Seems pretty straightforward. You just have to read the posts in the thread. All PWM

Re: [EVDL] Slow due to 96V pack?

this clarifies, Cor. -Original Message- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of paul dove via EV Sent: Thursday, September 14, 2017 3:04 PM To: Electric Vehicle Discussion List Cc: paul dove Subject: Re: [EVDL] Slow due to 96V pack? I agree but that is not what was claimed.

Re: [EVDL] Slow due to 96V pack?

David, You are SO right on that. I melted a wrench trying to remove a battery from one of my 48 Volt Citicars. That caused a lot of smoke from the contactor section but fortunately I had a great mechanic who was able to put things back together. I also destroyed a Curtis controller by

Re: [EVDL] Slow due to 96V pack?

I agree but that is not what was claimed. Sent from my iPhone > On Sep 14, 2017, at 4:57 PM, EVDL Administrator via EV > wrote: > >> On 14 Sep 2017 at 18:10, paul dove via EV wrote: >> >> There is no voltage adjustment on input voltage in any motor controller I >> ever >>

Re: [EVDL] Slow due to 96V pack?

On 14 Sep 2017 at 18:10, paul dove via EV wrote: > There is no voltage adjustment on input voltage in any motor controller I ever > used. EVERY controller I've ever used has had some kind of undervoltage limit, though in many cases it wasn't easily adjustable. David Roden - Akron, Ohio, USA

Re: [EVDL] Slow due to 96V pack?

to wise advise is all I want to offer. Cor. -Original Message- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of paul dove via EV Sent: Thursday, September 14, 2017 11:10 AM To: Roger Stockton; Electric Vehicle Discussion List Cc: paul dove Subject: Re: [EVDL] Slow due to 96V pack

Re: [EVDL] Slow due to 96V pack?

On 14 Sep 2017 at 17:19, Roger Stockton via EV wrote: > *IF* the sophisticated controller were replaced with a simple contactor > controller, then if the contactor controller allowed the entire 96V battery to > be connected directly to a stalled motor (~0 ohms), the voltage drop across > the

Re: [EVDL] Slow due to 96V pack?

<rstock...@delta-q.com> To: Electric Vehicle Discussion List <ev@lists.evdl.org> Cc: paul dove <dov...@bellsouth.net> Sent: Thursday, September 14, 2017 12:19 PM Subject: RE: [EVDL] Slow due to 96V pack? paul dove wrote: > That made no sense to me but a DC motor contr

Re: [EVDL] Slow due to 96V pack?

. The battery light on the dash will lightbelow this level. From: Roger Stockton <rstock...@delta-q.com> To: Electric Vehicle Discussion List <ev@lists.evdl.org> Cc: paul dove <dov...@bellsouth.net> Sent: Thursday, September 14, 2017 2:09 PM Subject: RE: [EVDL] Sl

Re: [EVDL] Slow due to 96V pack?

paul dove wrote: > There is no voltage adjustment on input voltage in any motor controller I > ever used. This discussion specifically concerns a vehicle using a Zilla motor controller; from the Z1K specsheet: "Other features include programmable motor voltage and current limits, programmable

Re: [EVDL] Slow due to 96V pack?

paul dove wrote: > That made no sense to me but a DC motor controller takes the input voltage > to power mosfets or igbts which switch the power on and off with a pwm > signal to get the desired output to drive a motor. It has no knowledge of > the battery impedance. The controller does not

Re: [EVDL] Slow due to 96V pack?

That made no sense to me but a DC motor controller takes the input voltage to power mosfets or igbts which switch the power on and off with a pwm signal to get the desired output to drive a motor. It has no knowledge of the battery impedance. Sent from my iPhone > On Sep 13, 2017, at 6:09 PM,

Re: [EVDL] Slow due to 96V pack?

paul dove wrote: > You said:Here's my guess: A 6v golf cart battery has an internal > resistance of about 5 milliohms (0.005 ohms). A 96v pack has 16 of them; > so the resistance is 0.005 x 16 = 0.08 ohms. Let's say the Zilla limits > voltage to 72v (i.e. it won't pull the pack below 72v). Then

Re: [EVDL] Slow due to 96V pack?

day, September 12, 2017 7:36 PM Subject: Re: [EVDL] Slow due to 96V pack? From: paul dove <dov...@bellsouth.net> > Current out of a battery is not calculated based on internal resistance. Actually, it is. The Equivalent Series Resistance (ESR) of a battery is not a theoretical number.

Re: [EVDL] Slow due to 96V pack?

From: paul dove > Current out of a battery is not calculated based on internal resistance. Actually, it is. The Equivalent Series Resistance (ESR) of a battery is not a theoretical number. It is found empirically by measuring the voltage drop caused by a high-current

Re: [EVDL] Slow due to 96V pack?

gt; Cc: Lee Hart <leeah...@earthlink.net> Sent: Monday, September 11, 2017 11:40 PM Subject: Re: [EVDL] Slow due to 96V pack? From: lektwik via EV <ev@lists.evdl.org> >96V  = Slug Not necessarily; but in this case, probably correct. Here's my guess: A 6v golf cart battery

Re: [EVDL] Slow due to 96V pack?

From: lektwik via EV >96V = Slug Not necessarily; but in this case, probably correct. Here's my guess: A 6v golf cart battery has an internal resistance of about 5 milliohms (0.005 ohms). A 96v pack has 16 of them; so the resistance is 0.005 x 16 = 0.08 ohms. Let's say the

Re: [EVDL] Slow due to 96V pack?

96V = Slug On Friday, September 8, 2017, John Lussmyer via EV wrote: > I'm helping a guy with a used conversion he just bought. > It's a S-10 with 96V of Golf Cart batteries, Zilla 1K, and a 8 or 9" motor. > Even fully charged - it's acceleration is poor. > I was never able

Re: [EVDL] Slow due to 96V pack?

On 09/09/2017 10:14 PM, John Lussmyer via EV wrote: I'm betting he has a Z1K LV - so that will limit how hi a voltage we can switch to when we switch to Lithium. (also dealing with it having 2, 10A 48V chargers - one of which is dead, so you have to switch the other charger back and forth

Re: [EVDL] Slow due to 96V pack?

On Sat, 9/9/17, John Lussmyer via EV <ev@lists.evdl.org> wrote: Subject: Re: [EVDL] Slow due to 96V pack? To: "Electric Vehicle Discussion List" <ev@lists.evdl.org> Cc: "John Lussmyer" <cou...@casadelgato.com>

Re: [EVDL] Slow due to 96V pack?

On Sep 9, 2017 9:20 PM, "John Lussmyer via EV" wrote: On Sat Sep 09 20:58:50 PDT 2017 ev@lists.evdl.org said: >I seem to recall that the minimum input voltage for a Zilla is 72 volts. >Might be sagging the pack to 72 volts and that is that is simply amps it >puts out at that

Re: [EVDL] Slow due to 96V pack?

On Sat Sep 09 20:58:50 PDT 2017 ev@lists.evdl.org said: >I seem to recall that the minimum input voltage for a Zilla is 72 volts. >Might be sagging the pack to 72 volts and that is that is simply amps it >puts out at that voltage. Well, as far as I could tell by the Volt meter, the pack wasn't

Re: [EVDL] Slow due to 96V pack?

I seem to recall that the minimum input voltage for a Zilla is 72 volts. Might be sagging the pack to 72 volts and that is that is simply amps it puts out at that voltage. On 9/9/2017 8:14 PM, John Lussmyer via EV wrote: On Fri Sep 08 21:57:43 PDT 2017 ev@lists.evdl.org said: There is both a

Re: [EVDL] Slow due to 96V pack?

John, As someone mentioned, even at 120v you won't get great acceleration with GC batts. That's why we often call them "lead sleds". Peter Flipsen Jr On Sep 9, 2017 7:14 PM, "John Lussmyer via EV" wrote: > On Fri Sep 08 21:57:43 PDT 2017 ev@lists.evdl.org said: > >There is

Re: [EVDL] Slow due to 96V pack?

On Fri Sep 08 21:57:43 PDT 2017 ev@lists.evdl.org said: >There is both a battery low voltage limit and a motor high voltage limit. >There is also a motor current limit and a battery current limit. > >You need to set all four to the appropriate values. yes, I know. Just forgot to list those Motor

Re: [EVDL] Slow due to 96V pack?

When I was driving my S-10 with 20 6v golf cart batteries (120v pack) I was never able to draw more than 240-300 amps from the battery pack even when the batteries were new. (and the acceleration wasn't great in anything but 1st gear from 0-20mph...) If your friend's pack is used, 200 amps

Re: [EVDL] Slow due to 96V pack?

There is both a battery low voltage limit and a motor high voltage limit. There is also a motor current limit and a battery current limit. You need to set all four to the appropriate values. You never said if you were reading battery current or motor current. Makes a bit of difference. Also,

[EVDL] Slow due to 96V pack?

I'm helping a guy with a used conversion he just bought. It's a S-10 with 96V of Golf Cart batteries, Zilla 1K, and a 8 or 9" motor. Even fully charged - it's acceleration is poor. I was never able to get it to draw more than 200 Amps in any gear at any speed. (Zilla limit is set to 500) About