http://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/zener-diodes/
Sent from my iPhone > On Jul 25, 2015, at 8:20 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-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) > _______________________________________________ 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)
