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London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#1
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On 19/01/2019 22:17, Recliner wrote:
Theo wrote: Graeme Wall wrote: Battery buses here in Guildford seem to cope with the hills with no problems. They've just been introduced on the park and ride services which all involve climbing hills many times a day. Electric buses are better for hills than diesel ones - they can regenerate on the way down, instead of using friction braking. Saves energy and reduces particulate emissions from brake pads. Yes, that's a very good point. I've used the BYD P&R buses in Nottingham which are electric - seem nippier than diesel too. Nice that the Guildford ones are built by Alexander Dennis in Guildford. The London ones are too. I think Dennis is BYD's local partner. Depending on the street layout, it might be feasible to fit trolley wires to key thoroughfares (think Oxford Street) and have the buses run on battery on non-wired parts of the route. That would reduce the size of battery they have to drag around, and so the weight and cost. Yes, good idea. Though you then have the weight and cost of the on-board electrical euipment to convert the trolley voltage to whatever the batteries supply. -- Graeme Wall This account not read. |
#2
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Graeme Wall wrote:
On 19/01/2019 22:17, Recliner wrote: Theo wrote: Graeme Wall wrote: Battery buses here in Guildford seem to cope with the hills with no problems. They've just been introduced on the park and ride services which all involve climbing hills many times a day. Electric buses are better for hills than diesel ones - they can regenerate on the way down, instead of using friction braking. Saves energy and reduces particulate emissions from brake pads. Yes, that's a very good point. I've used the BYD P&R buses in Nottingham which are electric - seem nippier than diesel too. Nice that the Guildford ones are built by Alexander Dennis in Guildford. The London ones are too. I think Dennis is BYD's local partner. Depending on the street layout, it might be feasible to fit trolley wires to key thoroughfares (think Oxford Street) and have the buses run on battery on non-wired parts of the route. That would reduce the size of battery they have to drag around, and so the weight and cost. Yes, good idea. Though you then have the weight and cost of the on-board electrical euipment to convert the trolley voltage to whatever the batteries supply. Presumably it would simply act as a battery charger, using the same voltage as the depot charger? |
#3
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Recliner wrote:
Graeme Wall wrote: On 19/01/2019 22:17, Recliner wrote: Theo wrote: Graeme Wall wrote: Battery buses here in Guildford seem to cope with the hills with no problems. They've just been introduced on the park and ride services which all involve climbing hills many times a day. Electric buses are better for hills than diesel ones - they can regenerate on the way down, instead of using friction braking. Saves energy and reduces particulate emissions from brake pads. Yes, that's a very good point. I've used the BYD P&R buses in Nottingham which are electric - seem nippier than diesel too. Nice that the Guildford ones are built by Alexander Dennis in Guildford. The London ones are too. I think Dennis is BYD's local partner. Depending on the street layout, it might be feasible to fit trolley wires to key thoroughfares (think Oxford Street) and have the buses run on battery on non-wired parts of the route. That would reduce the size of battery they have to drag around, and so the weight and cost. Yes, good idea. Though you then have the weight and cost of the on-board electrical euipment to convert the trolley voltage to whatever the batteries supply. Presumably it would simply act as a battery charger, using the same voltage as the depot charger? For electric cars, the “fast charger” supplies DC at about 500 V. For a larger bus sized battery an increase to perhaps 650 V might be sensible. Guess what trolley buses run on? Robin |
#4
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bob wrote:
Recliner wrote: Graeme Wall wrote: On 19/01/2019 22:17, Recliner wrote: Theo wrote: Graeme Wall wrote: Battery buses here in Guildford seem to cope with the hills with no problems. They've just been introduced on the park and ride services which all involve climbing hills many times a day. Electric buses are better for hills than diesel ones - they can regenerate on the way down, instead of using friction braking. Saves energy and reduces particulate emissions from brake pads. Yes, that's a very good point. I've used the BYD P&R buses in Nottingham which are electric - seem nippier than diesel too. Nice that the Guildford ones are built by Alexander Dennis in Guildford. The London ones are too. I think Dennis is BYD's local partner. Depending on the street layout, it might be feasible to fit trolley wires to key thoroughfares (think Oxford Street) and have the buses run on battery on non-wired parts of the route. That would reduce the size of battery they have to drag around, and so the weight and cost. Yes, good idea. Though you then have the weight and cost of the on-board electrical euipment to convert the trolley voltage to whatever the batteries supply. Presumably it would simply act as a battery charger, using the same voltage as the depot charger? For electric cars, the “fast charger” supplies DC at about 500 V. For a larger bus sized battery an increase to perhaps 650 V might be sensible. Guess what trolley buses run on? Exactly |
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