Charging EVs versus NZs net electricity generation
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kazbanz,
Jun 26, 11:47pm
and that is exactly the of argument the pro EV crowd use. look at this or that or another thing rather than look specifically at how much power running a full EV fleet would use.
ascotbks,
Jun 27, 1:43am
you realise someone is paying for and building this for a profit so its almost a slum before its built
ascotbks,
Jun 27, 1:49am
i dont know when you where you get your info or when last in wellington but sounds like 30 years ago. lambton quay is now mostly deserted apart from lunchtime and all the top shops have long gone. no parking means no shoppers. people cant take a bike to town and shop and if on a bus very limited in what they buy. most top shops now have moved to queensgate or porirua shopping centres or rongotai where all have free carparks and whats left are food type shops
tygertung,
Jun 27, 4:29am
Wellington a ghost town now eh? Hmmm.
marte,
Jun 27, 5:32am
That really just means that 100% of EV electricity will be Coal generated. And that is what your point is. They just dont get it.
callum.irvine,
Jun 27, 5:58am
You know of schools that still use boilers? I guess they could be out there, but all in my town use heatpumps. Some of them with extensive solar installs as well.
jhan,
Jun 27, 7:37am
I believe that putting this electricity onto the national grid will be very difficult if not impossible.
harm_less,
Jun 29, 7:10am
But when a large proportion of our vehicle fleet are EVs the combined battery capacity of that fleet will be immense. That pool of stored energy will very very valuable as reserve capacity for our power grid. While they are all connected during overnight charging V2G technology can be used to 'borrow' a couple of kWh from each of them which will amount to MWhs of available reserve electricity.
s_nz,
Jun 29, 7:48am
The project to add the capacity to the grid to handle this is already underway:
(The new line in the Southern South Island is only part of the plan, more needs to be done elsewhere for old systems)
aredwood,
Jun 29, 11:07am
The power supplies would be using Active PFC (power factor correction). The simple bridge rectifier / capacitor power supply has a power factor around 0.6 Meaning that you can get max of 1.4KW from a standard 10A socket with such a power supply. Use Active PFC, you can now get the whole 2.4KW from the same socket. Don't need as large filter capacitors, and you get around 380VDC.
Lines companies hate bad power factors. As they cause bad harmonics and excessive currents in the neutral wires on 3 phase circuits.
tygertung,
Jun 29, 6:19pm
The simple bridge rectifier / capacitor power supply is real old school and not used much any more apart from audio work.
tygertung,
Jun 29, 7:35pm
My hot water cylinder has its own breaker from the main house feed and doesn't switch through the main fuse box breaker. So it doesn't affect the load capacity of the house.
3tomany,
Jun 29, 10:13pm
Yes they are all converting away from them. As is many other industries however boilers are still our biggest coal user. A long way to go.
3tomany,
Jun 29, 10:20pm
That is about what i thought.
smallwoods,
Jun 29, 10:57pm
Some still use coal(very few),most use heat pumps, but are losing interest in these. Pellet or chip burners are the way they will head.
An architect friend was replacing school heat pumps with these before he retired.
jhan,
Jun 29, 11:06pm
I notice that articles don't discount other entities eyeing the Manapouri power capacity and the idea of moving their overseas operations to take advantage of it, in fact, I get the idea that it would be a preferable option for Genesis and the government which would mean more projects to make electricity in the North Island where demand is greatest.
loose.unit8,
Jun 29, 11:11pm
Night rate power is never switched off - I think you're confusing night rate with managed load (i.e. just hot water cylinders).
saki,
Jun 29, 11:43pm
Wait till Fontera gets rid of its coal fired boilers.
tweake,
Jun 30, 2:01am
really common in cheap led lighting, capacitor dropper with rectifier and smoothing cap. horrific PF.
rpvr,
Jun 30, 2:13am
THere is an increasing number of people who live in apartments with a parking space quite separate from their living area. How could charging facilities for an EV be provided for those people?
s_nz,
Jun 30, 3:21am
It still pulls of the same pole fuse, which for many houses (incl mine) in NZ is 60 Amps.
Some bigger houses have two or there of these 60A phases, and I think there is an option of a higher current (100A?) single phase feed, but it is fairly rare.
Also note for most house setups, the "Main switch" for everything but the hot water cylinder is just a switch, not a circuit breaker. The pole fuse is relayed on to protect the feed to the house from being overloaded. I think there is the option to add in a breaker in the customers to protect the pole fuse if the amount of load is getting marginal. Much nicer for the owner to reset a breaker on site, that to call the power company and wait two hours for them to replace the pole fuse, and pay the call out fee).
A technology that already exists (but is not yet common) is where the EVSE (EV wall box) is connected to a current meter (ring type). It continuously measures the current in the main feed, and will adjust the rate or stop the EV charging if required to keep under a specified current limit.
s_nz,
Jun 30, 3:24am
Yip. Fossel fuel use for process heat makes charging cars seem like a tiny problem. We will need to build heaps more generation capacity to move process heat to electric. (might be a while, companies won't be in a hurry to do this, as electricity is at least three times more expensive).
tweake,
Jun 30, 3:33am
now thats cool.
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