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: ev@lists.evdl.org > Subject: Re: [EVDL] 48V Energy Meter (Lead-Acid)... > From: ev@lists.evdl.org > > 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: cwa...@proxim.com 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-battery-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 > > > > > --- > El software de antivirus Avast ha analizado este correo electrónico en busca > de virus. > https://www.avast.com/antivirus > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: not available > Type: application/ms-tnef > Size: 4207 bytes > Desc: not available > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150724/75052e4f/attachment.bin> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150725/4e0cef71/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
