If you really want to know - measure the drain. Initially (after turning off the car or when just plugging in the battery) there will be a good spike, so make sure that your meter or external shunt can take that or use the trick to bypass the meter with a wire until the drain settles down (which can take several minutes, for example the Classic Prius keeps the wires glowing for the green fluorescent) display for a while after the door of the car has closed - there is no display but the software apparently still has a timeout on those things. You can see the wires glow in the dark)
There may be periodic drains (comuters waking up or transmitters reporting home or trying to contact your key FOB) but you should get a good idea how many milliamps are going with the car off, then simply divide the 7Ah by that current and you have the hours-till-death. 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:[email protected]] On Behalf Of rick via EV Sent: Friday, July 17, 2015 12:19 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] adding solar charging to 12 volt battery on LEAF On 07/16/2015 06:50 PM, EVDL Administrator via EV wrote: > On 16 Jul 2015 at 9:12, harry henderson via EV wrote: > > An SLI battery is designed for many shallow cycles starting an ICE. > With most EVs that have DC:DC converters, the house battery is used in > much the same way. In fact it's even less stressed, since it's only > there to close the main contactor. That should take much less energy than > cranking an ICE. > As soon as the contactor is closed, the DC:DC is recharging the house > battery -- or should be. > It also keeps the radio and any other "live" things running. If you don't drive it for a period that may constitute a fair drain. That said, I've swapped my EVs lead-acid starter battery with a tiny 7Ah lithium ion from Battery Tender and it seems to hold up for a least a week (the longest I've gone without driving so far). --Rick _______________________________________________ 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)
