Thanks to all for your recommendations.
Rush, yes.. I have 2 of them thanks to you :), but the owner of the
vehicle I'm going to use the meter wants something that tells him in
'percentage' an E-meter only has 4 LED lamps.
Cor, yes you are right; Xantrex is the new name of the E-Meter product,
and yes the new one works only up to 35V, but tech manual does not says at any
place where to move the decimal point or another different voltage value
reading. Maybe they just took out that feature on this new models.
Damon, an isolated power supply Cannot be done by just using a Zener
diode, that would be non-isolated and could work fine for your motorcycle as
long as you share grounds for 48V and 12V for your e-meter. But just as Robert
says; you would waste more energy on the (48-12V = 36) 36Volts side in heat all
time, than the power the meter consumes itself. You'd better use a mini
'switched power supply'. Some products like this ones would work perfectly
(especially the first result):
Saludos...
Ing. Marco Gaxiola
CEO/Director
Juarez #18, Col. Bachoco
Tel: +52(662)301.1070
Skype: info.energyev
www.energyev.com
-----Mensaje original-----
De: EV [mailto:[email protected]] En nombre de Robert Bruninga via EV
Enviado el: sábado, 25 de julio de 2015 07:50 a.m.
Para: damon henry; Electric Vehicle Discussion List
Asunto: Re: [EVDL] 48V Energy Meter (Lead-Acid)...
You must have a series current limiting resistor. The disadvantage of any
zener power supply/regulator is that you are wasting all the drop-down voltage
as heat. So for a 12v zener from 48v, only 1/4th of the power drawn actually
goes into the device. The rest is wasted.
bob
On Sat, Jul 25, 2015 at 9:20 AM, damon henry via EV <[email protected]>
wrote:
> Hi Cor,
> I have been around and using E-meters for many years now and this is
> the first time I have ever heard of using a zener diode as a method to
> create an isolated power supply for one. Is it really that simple?
> If so I might switch to this on my motorcycle (48v). I currently have
> a small 12 volt battery that I use just for running my meter, which is
> a pretty simple setup, but does require me to charge the battery once
> a week, and/or disconnect the battery if I leave the motorcycle unused for a
> long stretch.
> If I understand this method I would simply connect the emeter power
> through a zener diode off my traction pack and that would provide both
> the required isolation and enough of a voltage drop to keep from
> burning the meter out. That sounds easy :) Do you just wire the zener
> into one of the power leads from the traction pack to the emeter?
> Does it matter whether it is on the positive or negative lead? Are
> there other components that could/should be added like a fuse or current
> limiting resistor?
> thanksDamon
>
> > Date: Fri, 24 Jul 2015 23:15:24 -0700
> > To: [email protected]
> > Subject: Re: [EVDL] 48V Energy Meter (Lead-Acid)...
> > From: [email protected]
> >
> > The older (pre-decessor or just re-packaged?) Link 10 meter from
> > Xantrex was also limited to 35V (it is the 7800-series linear
> > voltage regulator
> max input)
> > so a 1:10 pre-scaler could be used to measure higher voltage, while
> powering the
> > unit from an isolated power supply between 12-35V although if it is
> > just
> 48V as in your case,
> > the prescaler is needed but the power supply can simply be a zener
> diode, dropping the
> > 48V (max charge voltage for example 60V so you would need a 25V or
> > next
> higher zener)
> >
> > If I am not mistaken, the Link 10 had a software feature to shift
> > the
> decimal dot a place
> > so you could take the 10:1 pre-scaler into account in Voltage and
> > energy
> measurements.
> > Not sure if this unit has that same feature - Lee might know as he
> > has
> made a
> > companion board for the Link 10.
> >
> > Regards,
> >
> > Cor van de Water
> > Chief Scientist
> > Proxim Wireless Corporation http://www.proxim.com
> > Email: [email protected] Private: http://www.cvandewater.info
> > Skype: cor_van_de_water XoIP: +31877841130
> > Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203
> >
> >
> >
> > -----Original Message-----
> > From: EV on behalf of Ing. Marco Gaxiola via EV
> > Sent: Fri 7/24/2015 11:08 AM
> > To: 'Electric Vehicle Discussion List'
> > Subject: [EVDL] 48V Energy Meter (Lead-Acid)...
> >
> >
> > I'm looking for an energy meter for a lead-acid 48V (Nominal)
> bank. A friend recommended me this one from Xantrex:
> >
> >
> http://www.xantrex.com/power-products/power-accessories/linkpro-batter
> y-monitor.aspx
> >
> > that looks great and ideal for my Project. But unfortunately maximum
> reading voltage is up to 35Vdc. (although using a pre-scaler in the
> input voltage and a 48V to 12V DC-DC power supply; the firmware
> parameters in the programming options of the device, according to the
> datasheet; are only up to 35Volts range)
> >
> > if someone does know of a similar product solution that could
> > be
> recommended, please advice.
> >
> >
> > (Application: It's intended to be used on an Electric Polaris
> Vehicle. I'm upgrading the battery pack, extra charger and adding some
> solar panels in order to improve range, charge time and ability to
> slowly self-recharge while in the sun. To be used on a Ranch.)
> >
> >
> > Ing. Marco Gaxiola
> > CEO/Director
> > Juarez #18, Col. Bachoco
> > Tel: +52(662)301.1070
> > Skype: info.energyev
> > www.energyev.com
> >
> >
> >
> >
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