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Old 03-07-2010, 12:54 AM   #59 (permalink)
bwilson4web
Engineering first
 
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Join Date: Mar 2009
Location: Huntsville, AL
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17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

Blue Bob's - '19 Tesla Std Rng Plus
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Quote:
Originally Posted by orange4boy View Post
No. For now it's manual but that would be a plan for later. Do you know of something readymade?
Uh, no, I would build one from my 'junk box.'

Specifications:
  • zener reference voltage
  • setable "cut out" voltage - trim resistor adjusts the cut out, once set, the battery is disconnected
  • setable "engage" voltage - second trim resistor adjusts the higher, enable voltage so the battery voltage rise from no load won't trigger oscillation.
  • enable line - tied to ignition, it enables the deep storage battery. Breaking enable line, disconnects the deep storage relay.
  • diode protected relay engage drive - (old school), optional MOSFETs

Actually it would be more fun to build an integrated system that includes the charger and a buck regulator to . . . <GACK> stop NOW!

Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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