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 voltage drops from 96v
riginal 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?
>
> There is n
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, Curtis, Sevcon, Zilla,
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 controllers
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.
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
allowin
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
>> used.
>
> EVERY co
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
EVD
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
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 batte
To: Electric Vehicle Discussion List
Cc: paul dove
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 controller takes the input voltage
> to power mosfets or igbts which switch the power
. The battery light on the dash will
lightbelow this level.
From: Roger Stockton
To: Electric Vehicle Discussion List
Cc: paul dove
Sent: Thursday, September 14, 2017 2:09 PM
Subject: RE: [EVDL] Slow due to 96V pack?
paul dove wrote:
> There is no voltage adjustment on in
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
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 have,
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,
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 th
what I said. I
ould be surprised if you could get a sustained 900 amps out of a lead battery
but I will have to take your word since I've never tried it.
From: Lee Hart via EV
To: Electric Vehicle Discussion List
Cc: Lee Hart
Sent: Tuesday, September 12, 2017 7:36 PM
Subject: Re
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 load. The voltage of a 6v g
ent: Monday, September 11, 2017 11:40 PM
Subject: 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
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 Zilla limits voltag
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 to get it to draw m
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 be
Dycus
On Sat, 9/9/17, John Lussmyer via EV wrote:
Subject: Re: [EVDL] Slow due to 96V pack?
To: "Electric Vehicle Discussion List"
Cc: "John Lussmyer"
Date: Saturday, September 9, 2017, 10:14 PM
On Fri Sep 08 21:57:43 PD
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 voltage.
Well, as fa
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 sag
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
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 both a battery low
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
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 see
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, it
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 18KW
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