Re: [EVDL] JDL404 AH Meter power draw?

[Mike Scott via EV]

Here's a decent small panel that i use:

https://smile.amazon.com/gp/product/B013DZWDI0/ref=oh_aui_detailpage_o08_s00?ie=UTF8=1

Note the use of standard MC4 connectors, using heavy gauge wire, not the
24ga that the HF panels use.
This puts out an honest 2.5A and it's very thin, slightly flexible ad less
than 2' square.

I also bouught a cheaper one:

https://smile.amazon.com/dp/B071ZB9G2X/ref=psdc_2236628011_t2_B013DZWDI0

I have not compared them yet, this one seems a tiny bit less, finish wise.

On Wed, Aug 23, 2017 at 6:28 PM, Mike Scott  wrote:

> Agree, those panels are very optimistically rated. I have 10 of them wired
> to a small grid-tie inverter, and while I don't know the efficiency of the
> inverter, I would assume that "150 Watts" worth of panels should be
> producing a bit more than 50-60 Watts in full sun...
>
> On Tue, Jul 25, 2017 at 10:23 AM, Lee Hart via EV 
> wrote:
>
>> From: paul dove via EV 
>> >What is the wattage on that Lee. I calculate 3Watts. 0.25 X 12 V = 3 W
>> >Harbor freight sells a 15 watt panel.
>> >15 Watt Solar Panel
>>
>> I don't recall what wattage was claimed. But many of these panels will do
>> things like advertise the short-circuit current, and open-circuit voltage,
>> and multiply them together to get the claimed wattage.
>>
>> That's completely bogus. First, it assume perfect full sun, at the
>> optimum angle, and a low ambient temperature. Second, you can't even get
>> half the short-circuit current into a real load. Third, the voltage under
>> load is substantially less than the no-load voltage.
>>
>> The more honest vendors will provide a voltage, current, and wattage
>> under realistic conditions, driving an actual load.
>>
>> Even then, you have to consider how you will actually use the panel. In
>> my case, the PV panel sits horizontally, on the shelf under my car's back
>> window. Thus it is never at the optimum angle, the glass reduces the light
>> intensity, and the temperature inside the car is always hotter than ambient.
>>
>> --
>> Excellence does not require perfection. -- Henry James
>> --
>> Lee A. Hart http://www.sunrise-ev.com
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>
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Re: [EVDL] JDL404 AH Meter power draw?

[Mike Scott via EV]

Agree, those panels are very optimistically rated. I have 10 of them wired
to a small grid-tie inverter, and while I don't know the efficiency of the
inverter, I would assume that "150 Watts" worth of panels should be
producing a bit more than 50-60 Watts in full sun...

On Tue, Jul 25, 2017 at 10:23 AM, Lee Hart via EV  wrote:

> From: paul dove via EV 
> >What is the wattage on that Lee. I calculate 3Watts. 0.25 X 12 V = 3 W
> >Harbor freight sells a 15 watt panel.
> >15 Watt Solar Panel
>
> I don't recall what wattage was claimed. But many of these panels will do
> things like advertise the short-circuit current, and open-circuit voltage,
> and multiply them together to get the claimed wattage.
>
> That's completely bogus. First, it assume perfect full sun, at the optimum
> angle, and a low ambient temperature. Second, you can't even get half the
> short-circuit current into a real load. Third, the voltage under load is
> substantially less than the no-load voltage.
>
> The more honest vendors will provide a voltage, current, and wattage under
> realistic conditions, driving an actual load.
>
> Even then, you have to consider how you will actually use the panel. In my
> case, the PV panel sits horizontally, on the shelf under my car's back
> window. Thus it is never at the optimum angle, the glass reduces the light
> intensity, and the temperature inside the car is always hotter than ambient.
>
> --
> Excellence does not require perfection. -- Henry James
> --
> Lee A. Hart http://www.sunrise-ev.com
> ___
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>
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Re: [EVDL] JDL404 AH Meter power draw?

[Lee Hart via EV]

From: paul dove via EV 
>What is the wattage on that Lee. I calculate 3Watts. 0.25 X 12 V = 3 W
>Harbor freight sells a 15 watt panel.
>15 Watt Solar Panel

I don't recall what wattage was claimed. But many of these panels will do 
things like advertise the short-circuit current, and open-circuit voltage, and 
multiply them together to get the claimed wattage.

That's completely bogus. First, it assume perfect full sun, at the optimum 
angle, and a low ambient temperature. Second, you can't even get half the 
short-circuit current into a real load. Third, the voltage under load is 
substantially less than the no-load voltage.

The more honest vendors will provide a voltage, current, and wattage under 
realistic conditions, driving an actual load.

Even then, you have to consider how you will actually use the panel. In my 
case, the PV panel sits horizontally, on the shelf under my car's back window. 
Thus it is never at the optimum angle, the glass reduces the light intensity, 
and the temperature inside the car is always hotter than ambient.

--
Excellence does not require perfection. -- Henry James
--
Lee A. Hart http://www.sunrise-ev.com
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Re: [EVDL] JDL404 AH Meter power draw?

[paul dove via EV]

What is the wattage on that Lee. I calculate 3Watts. 0.25 X 12 V = 3 W
Harbor freight sells a 15 watt panel.
15 Watt Solar Panel

  
|  
|   
|   
|   ||

   |

  |
|  
|   |  
15 Watt Solar Panel
 15 Watt, 12 Volt Solar Panel  |   |

  |

  |

 

  From: Lee Hart via EV <ev@lists.evdl.org>
 To: Mike Scott <mike.sc...@rennlist.net>; Electric Vehicle Discussion List 
<ev@lists.evdl.org> 
 Sent: Sunday, July 23, 2017 9:49 PM
 Subject: Re: [EVDL] JDL404 AH Meter power draw?
   
From: Mike Scott via EV <ev@lists.evdl.org>
>A small solar panel could supply that 300 mA easily with hardly any work at
>all...

300ma 24/7 is going to require a fairly large panel. I have a 12" x 9" PV panel 
that delivers 250ma *peak* (direct sun) on my Prius to keep the 12v battery 
charged. With night, cloudy days, and the non-optimum angle of the sun, it 
delivers less than 20ma average. So my guess is that you'd need several square 
feet of PV panels to get 300ma average.


--
Excellence does not require perfection. -- Henry James
--
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Re: [EVDL] JDL404 AH Meter power draw?

[Bill Dube via EV]

As I recall, there is a setting on the Emeter to only light the display 
(and draw most of the 12 v mA) when the pack amps is above some 
threshold value, plus or minus.

I recall it is the "auto display mode" that you want to set.
Makes a big difference. If nothing is changing, you don't need to see 
anything.


Bill D.

On 7/23/2017 9:04 PM, Cor van de Water via EV wrote:

Even the continuous draw of 80mA by the Emeter will drain my truck's small 12v 
battery, so i have rewired it to the contactor coil power, meaning that the 
Emeter is only powered when either driving or charging, not when parked. No 
more dead batteries.
Cor


On Jul 23, 2017, at 7:49 PM, Lee Hart via EV  wrote:

From: Mike Scott via EV 

A small solar panel could supply that 300 mA easily with hardly any work at
all...

300ma 24/7 is going to require a fairly large panel. I have a 12" x 9" PV panel 
that delivers 250ma *peak* (direct sun) on my Prius to keep the 12v battery charged. With 
night, cloudy days, and the non-optimum angle of the sun, it delivers less than 20ma 
average. So my guess is that you'd need several square feet of PV panels to get 300ma 
average.


--
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--
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Re: [EVDL] JDL404 AH Meter power draw?

[Cor van de Water via EV]

Even the continuous draw of 80mA by the Emeter will drain my truck's small 12v 
battery, so i have rewired it to the contactor coil power, meaning that the 
Emeter is only powered when either driving or charging, not when parked. No 
more dead batteries. 
Cor

> On Jul 23, 2017, at 7:49 PM, Lee Hart via EV  wrote:
> 
> From: Mike Scott via EV 
>> A small solar panel could supply that 300 mA easily with hardly any work at
>> all...
> 
> 300ma 24/7 is going to require a fairly large panel. I have a 12" x 9" PV 
> panel that delivers 250ma *peak* (direct sun) on my Prius to keep the 12v 
> battery charged. With night, cloudy days, and the non-optimum angle of the 
> sun, it delivers less than 20ma average. So my guess is that you'd need 
> several square feet of PV panels to get 300ma average.
> 
> 
> --
> Excellence does not require perfection. -- Henry James
> --
> Lee A. Hart http://www.sunrise-ev.com
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Re: [EVDL] JDL404 AH Meter power draw?

[Lee Hart via EV]

From: Mike Scott via EV 
>A small solar panel could supply that 300 mA easily with hardly any work at
>all...

300ma 24/7 is going to require a fairly large panel. I have a 12" x 9" PV panel 
that delivers 250ma *peak* (direct sun) on my Prius to keep the 12v battery 
charged. With night, cloudy days, and the non-optimum angle of the sun, it 
delivers less than 20ma average. So my guess is that you'd need several square 
feet of PV panels to get 300ma average.


--
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--
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Re: [EVDL] JDL404 AH Meter power draw?

[Mike Scott via EV]

A small solar panel could supply that 300 mA easily with hardly any work at
all...

On Sun, Jul 9, 2017 at 7:48 PM, John Lussmyer via EV 
wrote:

> On Sun Jul 09 19:09:58 PDT 2017 ev@lists.evdl.org said:
> >If John is running it at 12 volts, it would be 2 watts / 12 volts or
> >0.16 amps (160 mA).
>
> I'm mainly trying to figure out if I should move the JLD404 to the
> separate DC-DC that I'm now using to power the Zilla, BMS, and ZillaDash
> computer.  That provides 12V off the main pack instead of the 12V battery.
> (I've gotten tired of the 12V battery going dead.)
>
> I'm now seeing about a 300ma draw on the 12V battery when the truck is
> parked.  With the calculations above, the JLD404 is probably drawing about
> 1/2 of that.
> I'll probably move it to the "EV Systems" DC-DC as well.  (it's a fair
> amount of work to do so, as I have to open the dashboard.)
>
>
>
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Re: [EVDL] JDL404 AH Meter power draw?

[John Lussmyer via EV]

On Sun Jul 09 19:09:58 PDT 2017 ev@lists.evdl.org said:
>If John is running it at 12 volts, it would be 2 watts / 12 volts or
>0.16 amps (160 mA).

I'm mainly trying to figure out if I should move the JLD404 to the separate 
DC-DC that I'm now using to power the Zilla, BMS, and ZillaDash computer.  That 
provides 12V off the main pack instead of the 12V battery.  (I've gotten tired 
of the 12V battery going dead.)

I'm now seeing about a 300ma draw on the 12V battery when the truck is parked.  
With the calculations above, the JLD404 is probably drawing about 1/2 of that.  
I'll probably move it to the "EV Systems" DC-DC as well.  (it's a fair amount 
of work to do so, as I have to open the dashboard.)



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Re: [EVDL] JDL404 AH Meter power draw?

[Jay Summet via EV]

I think you want to do 2 watts / 8 volts = 0.25 amps as your 
maximumthe 2 watts / 30 volts = 0.0667 amps is your minimum.


If John is running it at 12 volts, it would be 2 watts / 12 volts or 
0.16 amps (160 mA).


However, the "2 watts" is probably the important piece of information 
here, although that may be a maximum draw amount.


Jay

On 07/09/2017 09:56 PM, Marco Gaxiola via EV wrote:

John,

The manual I have says: 'Operating Power: DC8-30V/2W', so that could be
at the most: 66.7mA

Marco Gaxiola

On Sun, Jul 9, 2017 at 5:24 PM, John Lussmyer via EV 
wrote:


Anyone know how much 12V power this meter uses?
(yes, I could measure mine - except that it's dash mounted, and just
getting to the power wires is a rather major undertaking.)

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Re: [EVDL] JDL404 AH Meter power draw?

[Marco Gaxiola via EV]

John,

   The manual I have says: 'Operating Power: DC8-30V/2W', so that could be
at the most: 66.7mA

Marco Gaxiola

On Sun, Jul 9, 2017 at 5:24 PM, John Lussmyer via EV 
wrote:

> Anyone know how much 12V power this meter uses?
> (yes, I could measure mine - except that it's dash mounted, and just
> getting to the power wires is a rather major undertaking.)
>
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[EVDL] JDL404 AH Meter power draw?

[John Lussmyer via EV]

Anyone know how much 12V power this meter uses?
(yes, I could measure mine - except that it's dash mounted, and just getting to 
the power wires is a rather major undertaking.)

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http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250
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