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I should think a clamp-on voltmeter would be safe enough to install somewhere along the passenger side cable run. Never owned one so not sure if they can read thru thick insulation, etc. If you know the pack voltage you essentially know the whole story.
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there is heaps of data from the battery that the car gets, but I think Tesla has chosen to not expose that to the end user.
Of what possible use do you have for this data? Perhaps we're being too literal when you ask for "real time voltage".Why would they not expose the data to the driver? Are they afraid that the data would expose trade secrets or maybe it would show some type of problem?
How would that help you plan anything? I'd find it interesting, but I wouldn't be able to do anything useful with the data. Now if there was a way to tell it what temperature to sit at, and to use land power to warm the pack then I'd have a use.I'd find it very useful to have a temperature readout for the battery pack. Just a single global pack temperature. Would be very useful for trip planning purposes in extreme cold conditions.
Hook a 10 megohm resistor to the 400v buss and bring into cab with 600v rated 26ga wire to your digital readout velcroed to dash. Heck, its only 400vdc, not like 14kv.