No backlight. On July 27, 2015 6:48:21 PM CDT, Cor van de Water via EV <ev@lists.evdl.org> wrote: >You mean to limit it to 20mA even while you turn on the backlight? >Then the meter's switching converter will try to draw more, so the >input voltage drops, while the converter tries to draw even more, >so the input voltage drops more - until it reaches a point where the >converter no longer works and stops drawing power, then the input >voltage will >recover to a point above where the converter starts again and the cycle >will >repeat. >Result will be a pulsed 12V output on the power converter, more than >likely >the meter will simply not work at all as if it is powered off. > >Cor van de Water >Chief Scientist >Proxim Wireless > >office +1 408 383 7626 Skype: cor_van_de_water >XoIP +31 87 784 1130 private: cvandewater.info >www.proxim.com > > >This email message (including any attachments) contains confidential >and proprietary information of Proxim Wireless Corporation. If you >received this message in error, please delete it and notify the sender. > Any unauthorized use, disclosure, distribution, or copying of any part >of this message is prohibited. > > >-----Original Message----- >From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Chris Meier >via EV >Sent: Monday, July 27, 2015 4:44 PM >To: Lee Hart; Electric Vehicle Discussion List >Subject: Re: [EVDL] 48V Energy Meter (Lead-Acid)... > >What happens with the E-meter/etc if you limit the available current, >say to 10-20ma? Will it retain accumulated amphours? Counting function? >No display until xx ma? > >-Chris > > >On July 27, 2015 5:56:16 PM CDT, Lee Hart via EV <ev@lists.evdl.org> >wrote: >>Cor van de Water via EV wrote: >>> Lee, Thanks for setting me straight that the backlight draws so much > >>> power that it is better not to use a zener. >> >>The older E-meter/Link-10 had LED displays. They drew more current. >The >> >>later LinkPro/LinkPro-Lite has an LCD display with LED backlight. >These >> >>draw less, but the backlight is still a power hog and takes about 30ma > >>at full brightness. The measurement electronics adds an additional >>10-20ma depending on what it is doing at the moment. >> >>> An ordinary buck >>> converter can be OK if both the meter power and measurements are >>> connected only to the pack, since then no chassis connection exists. >> >>Sure; that's fine if you don't mind the continuous supply current. >It's >> >>not a problem in an EV that's driven (and charged) regularly. The >>problem comes if you park the EV for months, and forget to disconnect >>the meter and don't have some kind of charger connected. >> >>> Do you know if the meter can be powered off when the car is not used > >>> without losing its memory? >> >>Yes, they have an EEPROM that retains setup information. But it will >>reset the accumulated amphours to zero. >> >>-- >>Pollution is nothing but the resources we are not harvesting. We allow > >>them to disperse because we've been ignorant of their value. >> -- R. Buckminster Fuller >>-- >>Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com >>_______________________________________________ >>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) > >-- >Sent from my Android device with K-9 Mail. Please excuse my brevity. >-------------- next part -------------- >An HTML attachment was scrubbed... >URL: ><http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150727/6c5d0d3a/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)
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