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 Post subject: Is an upgrade of JDEMO in the future possible ?
PostPosted: Mon Jun 19, 2017 1:30 am 
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Joined: Thu Dec 27, 2012 10:55 pm
Posts: 572
It seems the new leafs will be getting capability to charge up to 150 kW
http://insideevs.com/new-leaf-150-kw-dc-fast-charging-via-dbt/
Since they will have a larger battery pack than our rav4ev's I doubt it would be a good thing [TM] to charge our batteries with 150kW.
But an upgrade to eg 100 kW would be possible and given the fact that tesla charges at 120 kW (but again : larger battery packs) it would be nice to see if that is possible in the future.
Would of course mean :
- exchange of charge plug (or add-on ?)
- upgrade of cables.
- upgrade of software.
- $$$$ ;-)

Would be a statement that a car with an aftermarket upgrade would be upgradable to new standards.

_________________
Entune: plugfed | OpenEvse wifi controlled L1/L2 charging
silver 2014 vin: 3533 21k miles, 2 x GEM EV
past ev's: 3 yr leaf 30k, 3yr rav4ev 34k


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 Post subject: Re: Is an upgrade of JDEMO in the future possible ?
PostPosted: Mon Jun 19, 2017 6:10 am 
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Joined: Thu Jan 17, 2013 11:13 pm
Posts: 1534
Location: Los Altos, CA
I would like to see both of the following:

1. Determine the limits of the existing JdeMO hardware. How much current can the existing inlet and cabling safely carry? Are those the limiting factors? How does the battery cooling behave at that limit? Then change the firmware to allow the new max current with some safety margin. Determine cost and deployment method for the firmware upgrade.

2. Determine the limits of the non-JdeMO hardware in the car. For example, with upgraded cabling and inlet, how much current can the battery pack take within the cooling limits and a safe C-rate. Then determine trade-offs in additional hardware cost and their charge time improvements.

For example, if you could charge at 250 amps, but only for 3 minutes before it had to ramp down to 200 amps, is it worth upgrading stuff for 250 amps at all? Also, if the exiting hardware can safely handle 175 amps in all weather conditions, but upgrading the JdeMO hardware could handle 225, would anybody pay another $1,600 for that? 175 vs 225 is probably 25 min vs 19 min to add 65% SOC (ie. 10% to 75%) at full speed. After that it could be tapering.

All figures above are completely fabricated on my part. Also, just because I would like to see it doesn't mean it's worthwhile for Tony to do it...
Honestly, I'm not inclined to pay for more than #1 anyway.

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2012 Shoreline Blue #1462 w/JdeMO | 4.32kW Motech/Enphase PV Solar | Leviton EVB40 40A & Jesla Home Charging | 2015 Limestone Gray e-Golf LE


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