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Post by Eastlondoner62 on Sept 24, 2020 20:07:18 GMT
Quick question to what may have an obvious answer.
With the upcoming tender of the 173 it did make me wonder if the fact there's a large portion of the route on 50mph roads won't it be a faster drain on the battery? Because for something to go faster you need to pump in more energy, obviously diesels combat this issue by having gears, so they can be more efficient at high speeds but electric buses do not have this.
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Post by bus12451 on Sept 24, 2020 20:53:20 GMT
Quick question to what may have an obvious answer. With the upcoming tender of the 173 it did make me wonder if the fact there's a large portion of the route on 50mph roads won't it be a faster drain on the battery? Because for something to go faster you need to pump in more energy, obviously diesels combat this issue by having gears, so they can be more efficient at high speeds but electric buses do not have this. Isn't regenerative braking the answer to this? I believe when an EV coasts and decelerates, the motor provides reverse torque so it essentially becomes a generator whereby kinetic energy from the wheels is transferred to electricity which is fed back to the battery. All of this regardless of the speed the vehicle travels at. Some energy is obviously still lost (as heat) otherwise the vehicle would never have to be recharged again. Unlike conventional brakes where all kinetic energy is lost as heat from friction between the wheels and brake pads.
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Post by Eastlondoner62 on Sept 24, 2020 21:29:10 GMT
Quick question to what may have an obvious answer. With the upcoming tender of the 173 it did make me wonder if the fact there's a large portion of the route on 50mph roads won't it be a faster drain on the battery? Because for something to go faster you need to pump in more energy, obviously diesels combat this issue by having gears, so they can be more efficient at high speeds but electric buses do not have this. Isn't regenerative braking the answer to this? I believe when an EV coasts and decelerates, the motor provides reverse torque so it essentially becomes a generator whereby kinetic energy from the wheels is transferred to electricity which is fed back to the battery. All of this regardless of the speed the vehicle travels at. Some energy is obviously still lost (as heat) otherwise the vehicle would never have to be recharged again. Unlike conventional brakes where all kinetic energy is lost as heat from friction between the wheels and brake pads. Yes you are indeed right, completely forgot about the reverse torque feature. It will in theory mean the faster spinning wheels will generate more electricity to be pumped back into the bus.
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Post by COBO on Nov 1, 2020 3:19:43 GMT
I was thinking could the electric double deckers get around all the London bus routes like the E1? Are there smaller electric double deckers than 10.9m?
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Post by Deleted on Nov 1, 2020 9:03:59 GMT
I was thinking could the electric double deckers get around all the London bus routes like the E1? Are there smaller electric double deckers than 10.9m? Optare Metrodecker which is 10.5m and is also available at 11.1m.
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Post by bustavane on Nov 1, 2020 9:36:09 GMT
I was thinking could the electric double deckers get around all the London bus routes like the E1? Are there smaller electric double deckers than 10.9m? Optare Metrodecker which is 10.5m and is also available at 11.1m. Wasn't this the reason given for the order for Metrodeckers for the 200? (Ees couldn't pass route test?)
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Post by galwhv69 on Nov 1, 2020 10:02:37 GMT
Optare Metrodecker which is 10.5m and is also available at 11.1m. Wasn't this the reason given for the order for Metrodeckers for the 200? (Ees couldn't pass route test?) Yep, the Ee couldn't complete the turning circle at (I think) Copse Hill whilst the OME could
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Post by LJ17THF on Nov 1, 2020 11:27:55 GMT
I was thinking could the electric double deckers get around all the London bus routes like the E1? Are there smaller electric double deckers than 10.9m? Optare Metrodecker which is 10.5m and is also available at 11.1m. I don't think the 11.1m one is available with TfL spec, it's only provincial.
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Post by redbus on Nov 1, 2020 17:38:04 GMT
Quick question to what may have an obvious answer. With the upcoming tender of the 173 it did make me wonder if the fact there's a large portion of the route on 50mph roads won't it be a faster drain on the battery? Because for something to go faster you need to pump in more energy, obviously diesels combat this issue by having gears, so they can be more efficient at high speeds but electric buses do not have this. Assuming the electric bus is built to go for such periods of time at 50mph, it is not an issue. Yes, more energy maybe needed but as you say the same is true for other vehicles including diesel buses. The question of gears is a red herring, gears are needed on diesel buses because of the limited rev range where you get good power and torque. This limitation does not apply to an electric engine which can provide good power and torque over a far greater rev range.
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Post by galwhv69 on Nov 10, 2020 17:17:11 GMT
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Post by snowman on Nov 14, 2020 8:34:41 GMT
It would seem the question of a 9m electric bus has now been solved as Solaris Urbino is now available in that length. It is unclear if it would be available as right hand drive
The electric Urbino seems to be gaining popularity, Milan has just ordered another 100 of them (but in 12m length)
I do wonder if ADL are going to run into production limitation problems if they use BYD chassis and BYD ration them to about 30 per month, at its peak ADL was making nearer 100 buses a month, although that was when most were diesel power, with some hybrids.
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Post by Deleted on Nov 14, 2020 8:46:16 GMT
Surprised no press release yet about big order of electrics for RATP .
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Post by Eastlondoner62 on Nov 14, 2020 11:39:13 GMT
Surprised no press release yet about big order of electrics for RATP . It's not even been two weeks since the tender result.
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Post by bertrell on Nov 14, 2020 12:36:56 GMT
Surprised no press release yet about big order of electrics for RATP . Apparently the rumour is they were made some months ago!
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Post by snowman on Nov 14, 2020 14:13:11 GMT
Surprised no press release yet about big order of electrics for RATP . Apparently the rumour is they were made some months ago! I assume you mean ordered few months ago, not built while ago. I too had heard similar rumour that a big order had been placed, although I suspect it was part firm, part options. Almost a certainty that other Operators couldn’t pick up all the routes (lack of garage space) and the SPs being 12 years old (in 2021) had to be replaced. So ordering some was safe. I suspect if true the required number has since been firmed up by converting the options into actual orders.
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