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I just recently had to replace the 12V auxiliary battery in the electric MR2 after almost 2 years of driving. The 12V battery on converted electric cars, serve mostly the same purpose as the 12V battery in a gas car. Have you ever left the lights on after driving in the rain and come back to a dead battery? Based on your normal driving pattern, estimate the max downtime you will have between driving the car.
Multiply the amp draw result from step 1 by the number of hours representing the time you will not be driving the car on a regular basis from step 2. The electric MR2 uses a 22 amp-hour (AH) deep cycle sealed lead acid battery, which should   give me ample energy to park the car for over 10 days.


I don’t, however, recommend doing this because if you ever leave your lights on, you could deplete you main pack battery much quicker. For those of you driving electric cars, how many days can you park your electric car without the 12V battery draining? Related PostsMay 15, 2013 -- Should you install a Battery Management System to protect those expensive Lithium batteries? Thanks for the numbers, that makes me feel a bit more confident that my amp draw is inline with yours. No, I don’t have an ignition relay between the dc-dc converter output and the 12V battery as your set up shown in the schematic diagram.
Thanks to all those that responded with your suggestions (Here’s a thread of discussion that I posted on diyelectric car and the many useful response I got on the post).


HOV stickers to be extended for electric cars in California until 2020 but not for conversions yet. Multiple functions: alternator state check, battery state check, check before charge and overload display.



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