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Nissan's third generation e-POWER powertrain

170 points · 462 comments · mroche

  1. Toutouxc · · focus · HN ↗
    I used to like hybrids, and obviously series hybrids are the coolest kind of hybrids, but now that I’m driving a budget EV, I honestly don’t see the point anymore. Just get the EV and skip the awkward half-way step that inherits the most expensive and complicated parts from both designs.

    Seeing a sleek modern car pull away whisper quiet and then start the ICE 3 seconds later with a stutter and a puff of water vapor from underneath is the most schizophrenic sight, it somehow feels more dated than actual ICE cars.

    Unless you live in bumfuck nowhere with expensive electricity, zero solar power and a daily 5 hour commute, an EV will likely work just fine for you.

    1. acomjean · · focus · HN ↗
      Also city dwellers with street parking and it’s hard charge, so a pure EV is a bad fit.

      Hybrids with their good mileage although complex are a good fit for those.

      1. nasmorn · · focus · HN ↗
        I thought this but after 3 years I can say it is unfounded. the only reason I ever think about my state of charge on the city is when I need it to be low so I can use street parking that requires me to charge.
        1. lumost · · focus · HN ↗
          We really need more slow charging stations for folks to just park at. I’d have assumed that the economics would have been favorable to charge by the day/night rather than by the minute.
          1. tencentshill · · focus · HN ↗
            Every street lamp has 15a of power already running to it. It would be trivial to add an outlet to each one.
            1. amluto · · focus · HN ↗
              There’s a genuine technical issue: the AC EVSE protocols (J1772, NACS, etc) have several safety features that are far in excess of anything you’ll find in a regular 15A NEMA receptacle. I don’t think it would be wise to gave high traffic NEMA receptacles on fully weather-exposed streetlights.

              The hardware for the safety systems would not be expensive in volume, but the cable and connector are expensive and bulky. And none of the EVSE standards are specified in a variant where the receptacle is fixed and the car carries the cable.

              This is solvable, obviously. I don’t know whether drivers would want to deal with having their own cables, though.

              1. Toutouxc · · focus · HN ↗
                Having your own cable for AC (here it's Type 2) is the norm in Europe, so I'd say it's survivable.
                1. numpad0 · · focus · HN ↗
                  The point is that EVSE plugs are safer and European dryer plugs under the rain out in the open is technically kind of dangerous.
                  1. Toutouxc · · focus · HN ↗
                    No, the cable you carry for AC charging has a Type 2 connector on both sides, it's purely an EV charging cable. It's not the same 3-phase plug you'd plug a table saw into.
                  2. hdgvhicv · · focus · HN ↗
                    Mines IP55 and the wall and 65 at the car, perfectly fine for heavy rain.
                2. amluto · · focus · HN ↗
                  AIUI, Tesla really screwed the pooch here. For the original Model S, Tesla really really wanted the US model to tuck the charge socket under the little hinged reflector, and they couldn’t figure out how to fit the Type 2 “Mennekes” connector their. So they invented their own socket (which evolved into NACS), and the Tesla one is rather inferior to Type 2, at least when used for AC charging.

                  And now every EV needs to have a different charge port configuration for North America vs Europe, and North America is stuck with NACS. (NACS is fine for DC but still sucks for AC. It cannot support 3-phase charging (which I admit has always seemed like a silly feature except in the limited case of 1 or 2 chargers in a single family residence), and cables and adapters cannot passively report their current rating. So you would need to build a kind of gnarly active MITM system to make a safe extension cable, whereas a Type 2 to Type 2 cable is built part of the Type 2 design.

                  Later, Tesla proved the whole thing pointless by successfully fitting Type 2 in the same location…

                  1. numpad0 · · focus · HN ↗
                    European Model S has Type 2 in that location, only ones that don't fit is the Type 2 CCS with giant DCFC pins below the regular Type 2. NACS is just Tesla doing Apple.
                    1. amluto · · focus · HN ↗
                      NACS is far less clunky than CCS. And don’t get me started on ChaDeMo - my best guess is that whoever designed it thought that big heavy awkward gasoline nozzles where cool and wanted their EV chargers to be at least as massive.
                      1. hdgvhicv · · focus · HN ↗
                        ChaDeMonis basically dead now other than for existing cars. A typical U.K. service station will have 20 ccs chargers for every chademo, and nobody is deploying the latter for new places.

                        Means existing chademo cars will have less value as time goes on.

                      2. numpad0 · · focus · HN ↗
                        I think massive CHAdeMO plugs might have been for ultra rapid charging that never rolled out. There are brochures of 350kW+ watercooled CHAdeMO charging test equipment floating online, noted as plug limited to 200kW, dated at least as far back as 2015. That was when Tesla was still rolling out V2 150kW. So the plug overall dimensions and pin sizes are probably way overspecced for what it is in practice.
                  2. sugarkjube · · focus · HN ↗
                    > 3-phase charging (which I admit has always seemed like a silly feature

                    Well, 3phase is more efficient as you have less losses in the cabling.

                    May save you 5-10% on the bill.

                    1. amluto · · focus · HN ↗
                      3 phase has a property that the total power is (with fully balanced loads and no harmonics) constant. But n phases, equally spaced in phase angle, each an RMS voltage V from ground, with RMS current I per phase in phase with the voltage to ground, gives power n•V•I. (I’m assuming that n>=2 so that there is no neutral current.) There’s no savings for n=3 vs n=2.

                      There is a savings over the system in which you use 2 of 3 phases, which gives unbalanced phase angles. And that system is widely used in the US in non-single-family installations. But if you have a bunch of chargers, you put 1/3 of them on each of the pairs of phases, and everything balances back out at the panel whenever a decent number of chargers are in use.

                      Maybe, if a a car could rely on having 3 phases, it could avoid some ripple filtering by taking advantage of constant supply power (no 2f component), but cars need to be able to charge from a single phase even in Europe.

                  3. simondotau · · focus · HN ↗
                    I think the timeline is a bit off. When Tesla designed its connector, Type 2 wasn’t yet the established European standard. Tesla had shown its proprietary connector by 2011 and shipped it in 2012; Type 2 wasn’t selected as Europe’s common connector until 2013.

                    When Tesla later engineered the European Model S, it needed three-phase AC and adopted a modified Type 2 connector, which fitted behind essentially the same tail light door.

                    But that’s all history now.

                    Arguably both markets ended up with good solutions for their needs: NACS is exceptionally compact and well suited to North American single-phase AC plus DC fast charging, while Type 2 is larger but supports Europe’s widespread three-phase AC.

                    1. amluto · · focus · HN ↗
                      > Arguably both markets ended up with good solutions for their needs

                      Only because everyone aimed too low. NACS (as mentioned before) doesn’t cleanly support adapters or detachable cables. And CCS Combo 2 is unnecessarily clunky. And you end up in a rather awkward position if you ship a car from the EU to North America or vice versa.

                      It ought to be entirely straightforward to design a standardized cable, NACS at one end and with a new interface at the other, that can attach and detach from a compact and weather resistant charge port. It would be fully compatible with all NACS vehicles, and it would achieve this by negotiating voltage and current limits with the EVSE at the other (newly specified) end.

                      It could even be cheap in a low-current version — it would basically be an extension cord, with two 12AWG hots and a ground plus a couple of little wires and the whatever inexpensive electrical parts are needed to declare its capabilities. If you can buy an e-marked USB-C cable for a few dollars, the latter won’t cost much.

                      1. simondotau · · focus · HN ↗
                        It wasn't a matter of aiming low. NACS is arguably the perfect connector for the North American marketplace, or as perfect as anyone could reasonably expect for a standard of this class. The only other option on the table was a migration to CCS1, which would have been an objectively worse choice in literally all respects. CCS1 is more cumbersome, more fragile, and never enjoyed any numerical/incumbent advantage, peaking at 31% of deployed vehicles and plugs.

                        Shipping a car between the USA and Europe is an extreme edge case for wealthy people and the marketplace can solve for the issue of adapters and dongles where the need arises.

                        (For reference, I'm in a CCS2 marketplace.)

                3. hdgvhicv · · focus · HN ↗
                  My car draws 7kW from the charger at home. You can get a standard plug in 2kW charger but they are a lot less efficient.

                  US power supplies tend to be 1kW though for constant load (1.5kW rather than 2kW) so even worse.

              2. j1elo · · focus · HN ↗
                I got it, we need a new USB-C connector (C for Car), that'd be something to see.
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