On aircraft, 28 volts (24 volts) has been the standard low voltage
forever. It is the standard on specialized military vehicles and
equipment as well. (Yes, you can find 12 volt systems, but only in tiny
airplanes and small OEM type military vehicles.)
"42 volts" is the threshold for "low volt
I should note that the connector is designed so that the pilot wire
(communication wire) is the very first to disconnect. If the regulation
is followed correctly, this should automatically de-energize the entire
circuit, before the connector comes apart completely.
> Locking connector rant
The tough one is "pull skiers for several hours before recharging."
This requires something like 75 HP continuous for several hours. This
would require 60 kWh per hour of operation.
A boat that could foil (instead of merely coming up on plane) would use
less HP perhaps, and would thus require a
As an aside, I would like to note that the reverse voltage spike that
occurs when you switch off power to coils, motors, etc. on the 12 volt
side of things must be dealt with. The magnetic field in these devices
collapses when you switch off the current flow, and then create HUGE
reverse voltag
>>> Comments on your advice <<<
All good advice with a couple of minor oversights:
1) Manzanita chargers have a substantial output capacitance. (I use one
to charge our race vehicle(s) and I have a pre-charge circuit to
gracefully charge the capacitors on the battery side.)
2) The Manzanita c
Pretty much every highway-capable OEM EV company has tried, and
rejected, the hub motor design concept. Every one!
Hub motors sound absolutely marvelous to anyone that has not gone down
that path before. (Like management that have not full thought out the
issues.) Then, once you actually have
Often, the brush dust will cause a leakage isolation current.
You can start by simply blowing out the commutator with compressed air.
See if the leakage current changes. If it is less, but hasn't gone away
completely, pull the brush housing screens and give the brush rigging
and commutator a
Sound like something is not quite right. These contactors should last
forever, basically.
First, are they getting 12 volts? If they are not getting 12 volts all
the time, then they can not close completely or open just a touch.
Something when the pack sag under load, the DC-DC will cut out due
What is important to keep in mind is that BYD is is now offering a
Corrola-sized EV for about $15k.
https://electrek.co/2024/02/19/byd-launches-15k-qin-plus-ev-kicking-off-price-war-gas-cars/
It is impossible to build your own EV for even double this price, even
getting all the labor for free.
I think the simplest would be to install a NEMA 14-60 with a 60 amp
breaker, and swap in a NEMA 14-60 cord cap on the charger.
If you are over 50 amps, you are exempt from the NEC GFCI requirements,
even outdoors. A bit silly, but this is what the NEC rules say you can
do
You could subse
I suspect that the competition has recently heated up in the low end of
the EV market. It has evolved into the inevitable "race to the bottom."
I'm thinking that Elon has acknowledged the lack of profitability in
this market sector and has decided to gracefully bow out.
There was a news articl
Most of the world outside North America, is 230-240 VAC to ground. Split
single phase, 120-neutral-120, is essentially only in North America.
Normal circuit breakers are only single pole and only switch the live
conductor. It is not common to find a circuit breaker that cuts the
neutral as wel
The consensus is that ~30mA is the threshold for a fatal shock under
ordinary circumstances:
https://en.wikipedia.org/wiki/Electrical_injury
and
https://www.asc.ohio-state.edu/physics/p616/safety/fatal_current.html
Thus, most countries pick 30 mA as the trip for GFCI (RCD). Picking a
greater cu
First, breakers themselves really don't care which way the power is
flowing. I can't think of anything about a breaker that would behave
differently if the power flows in or out of the bus bars.
VERY large breakers need power on the input side to rewind the trip
mechanism. Even then, you simpl
The NEC has changed through the years regarding GFCI protection.
120vac outdoor outlets were required to be GFCI protected since ~1972.
In the '80s when I worked as an electrician, outdoor 240 volt NEMA 14-50
outlets were not required to be GFCI protected, but when used to power a
hot tub, or
Just a totally OT comment on this:
I'm retired now, but I used to have several colleagues in climate
research. (Basically, they are what a common person would call a climate
scientist.) When I spoke with any of them privately, they all expressed
the opinion that we have likely "broken the
These stats don't align with my personal experience. We have owned two
used Leafs over the past 7 years and have had zero (0) issues. Changed
tires, changed wiper blades, and filled the windshield washer fluid.
Never brought either in for any repair. How did Nissan fair compared to
others in th
The A123 26650 M1-B cells will throw over 200 amps to a short circuit.
Considerably more if they are at optimum temperature. :-)
The short circuit current will actually go up as the cell heats up. This
assumes that whatever caused the short hasn't vaporized
These are _very_ well designed
There are often tax advantages to structuring maintenance costs as a lease.
Bill D.
On 10/17/2023 7:00 AM, EV List Lackey via EV wrote:
https://www.businessinsider.com/tesla-owners-bill-battery-damaged-ev-
scotland-weather-2023-10
or https://v.gd/yIsSe4
Ouch. That price, $21k, seems a tad pr
I agree with Phil.
I also doubt that cell towers are the root cause of your issue.
The problem is likely due to the motor wiring and other power wiring not
kept separate/distant from the throttle wiring. The throttle wiring
needs to be a small, shielded, 3-wire cable, kept very distant from an
When they went from a simple NEMA 14-50 plug for charging to a
complicated system that "enables" (requires) your car and the charger to
communicate, you unintentionally gave up your privacy when using a
public charger.
The car and the charger can get quite chummy and share all sorts of
inform
They want to gather data. It has serious value.
The vehicle "talks" to the charger and exchanges data. Vehicle type.
Vehicle ID. State of charge. Battery health. _Lots_ of data is given to
the charger.
Bill D.
On 6/10/2023 9:52 AM, EV List Lackey via EV wrote:
On 9 Jun 2023 at 8:04, Tom Ke
Toyota is a closely held business. I believe it may be owned by a family.
They were on the forefront of alternative fuels for many years, but they
stubbornly would not come out with a battery powered vehicle, until
everyone else came out with one and they basically had no choice.
I suspect tha
Hi Mark,
The most straightforward way to add redundancy and to solve the
overheating problem is to install a second motor on the same shaft and
run it with the second inverter. Close to the redundancy of a twin
engine aircraft. He could perhaps reduce the size of each the twin
motors sligh
Charging A123 Systems LiFePO4 cells:
They are fully charged when the voltage reaches 3.45 volts and you
should never go over ~3.6 during the charge. If you stay below ~3.6
volts, you can charge these cells at whatever current you care to, just
stay below ~3.6 volts. If you go above 3.8 vol
Labor is the main expense in car manufacture. Materials for a larger
vehicle add only an incremental cost. Luxury options cost just a tiny
faction of what they consumer pays for them. It is not uncommon that the
luxury option is just a change to the firmware and the additional cost
to the manuf
You haven't actually met Elon, have you.
I have it on good authority that Elon is a very very difficult man to
work for. This may be why he is so successful, perhaps.
What I read in the news lately about Elon seems completely in character
for him. I don't doubt anything I have read so far in
Fast charging during the day will be expensive for trucks and thus be
unpopular.
The fast charger operator will take a cut, and the grid operator will
charge peak rates for electricity.
Passenger EV's don't typically use fast chargers, they charge at more
reasonable speeds and rates at home. Y
< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
-- Original Message --
From: "Bill Dube via EV"
To: ev@lists.evdl.org
Cc: "Bill Dube"
Sent: 23-Nov-22 14:55:48
Subject: Re: [EVDL] the grid needs upgrading - fast
No need upgrade the grid. None. Just need a
No need upgrade the grid. None. Just need a few incentives and a little
intelligence.
There is a lot of misinformation about this, here on the EVDL even.
>> Grid capacity problem ? >>>
There is LOTS of power available on the grid, just not at the peak
times of the day. No pro
There are many varieties of Li Ion to choose from. At this point in
time, Li Ion appears to be the primary secondary, so to speak, battery
choice. :-)
Lead acid, much like other legacy technologies, will take some time to
fade into the background. It is simply a matter of time.
Lead acid bat
Don't tax fuel. Tax tires.
If you tax tires according to their load rating, and also perhaps
by their wear rating, you can properly tax vehicles on how much "road"
they are "using up."
There is a down side to this approach. Folks will not replace worn
out tires. They will also b
The Leaf has an app that runs on your cellphone that can allow it to
pre-heat or pre-cool the car interior while it is plugged in. You can
also set a time to do this manually from the dash. Makes a HUGE
difference in range if you can use this feature.
Easier than defeating the heater somehow.
any substantial government support.
It does not have spectator appeal either. I think it is beating a dead
horse, unfortunately.
On 4/24/2022 2:17 PM, EV List Lackey via EV wrote:
On 24 Apr 2022 at 13:55, Bill Dube via EV wrote:
Here in NZ, the EVolicity competition supplies an electronic g
Here in NZ, the EVolicity competition supplies an electronic gizmo that
restricts/measures the wattage of the drivetrain.
Thus, any type of battery may be used.
It's a HS competition, so putting a cap on the wattage actually works.
Bill D.
On 4/24/2022 4:40 AM, Gary Krysztopik via EV wrote:
This Electrathon topic brought to mind Steve Van Ronk, who was a
nagging thorn in the side of Electrathon America. Electrathon America
finally when to court against Steve. Steve claimed all sorts of
infringement etc. for many years and threatened the regional chapters
(including Colorado) w
Hi Gary et al.
I have built a couple of Electrathon cars (and have great
admiration for Dave Cloud's Electrathon designs) and have participated a
bit in years past. Educational and great fun for the participants.
(Spectators, not so much. )
There is a extremely successful and thrivin
Eva's record setting electric motorcycle, the KillaJoule, is now on
display at the Petersen Automotive Museum in Los Angeles Calif.
Great photos here:
https://www.petersen.org/killajoule
They shipped it all the way from New Zealand!
The KillaCycle is also on display right next to it, but they
They typically use a specialized knife to cut this urethane adhesive on
windshields and other autobody panels. (The blade used to be heated
electrically, but these are falling out of fashion. The old style
adhesive was not urethane, but rather more like tar. You had to melt it
as much as cut it
The float voltage is 13.5 to 13.8 volts. That is what you would expect
to see on the battery terminals when the car has been running for
awhile. Charging begins at about 13 volts, BTW. All these voltages are
at 25 Celsius. Colder means higher charging voltage (and float voltage.)
Hotter means l
The voltage on a lead-acid battery goes _up_ in cold weather, by the way.
Under load in cold weather, however, the higher impedance will tend to
make the 12 volt battery voltage sag under load.
But the the vehicle DC-DC is working when the brake issue arises, so the
battery will play a smalle
Mount a five (5) pin male connector ("inlet") on the side of the golf
cart for the 120 VAC cord.
Connect the 120 VAC hot, neutral, and ground using three (3) of the
pins, A, B, C, in both the golf cart and the cord portions of the connector.
In the golf cart, use the two (2) remaining pins, D
I believe the patent(s) have timed out, and with that, the core legal
wranglings have as well.
Bill D.
On 3/14/2022 7:05 AM, EV List Lackey via EV wrote:
On 13 Mar 2022 at 10:59, Michael Ross via EV wrote:
I suppose this explains a lot about why Tesla (and Straubel) are leaning
hard towards
List Lackey via EV wrote:
On 1 Mar 2022 at 13:47, Bill Dube via EV wrote:
"Do you want to make noise, or do you want to win races and set world
records? I'd rather set world records."
This pretty much ends the discussion, because it points out the
foolishness of the loud exhaust
My answer to this "joy of loud ICE noises" statement is:
"Do you want to make noise, or do you want to win races and set world
records? I'd rather set world records."
This pretty much ends the discussion, because it points out the
foolishness of the loud exhaust argument.
EV's are going to
Snowmobiles have power requirements similar to boats or airplanes.
Unlike cars (or trains) that draw little power once they are rolling,
snowmobiles have considerable drag while moving through the snow. Thus,
the range for a given battery capacity can be quite low, especially in
deep, wet, snow
In a passenger car, at highway speeds, hub motors are a very bad idea.
(Slow moving hub motor vehicles, like scissor-lifts and floor scrubbers,
are a marvelous idea, BTW.)
Pretty much every major automotive manufacturer has prototyped a car
with hub motors at one time or another through the ye
I think that this ship will likely burn and then sink to the bottom of
the ocean. Thus, we will likely never know what actually caused the fire.
Having said that, statistically, ICE cars catch fire _far_ more
frequently than electric cars.
Bill D.
On 2/19/2022 3:23 PM, EV List Lackey via EV
Michael -
How, exactly, would Mark be able to provide "factual data" on this
incident? If you think about it, how would _anyone_ be able to, since
the device that could record the incident data was off-line at the time
it happened and this was the root cause of the incident? Mark speculat
Tesla should treat a stop sign according to the law. However, the
computer is acting logically according to the actual situation. I would
suspect that there logically should be a yield sign instead of the stop
sign.
In most civilized parts of the world, stop signs are _extremely_ scarce.
With an AC drive, there is no excuse not to use regen. It is built in,
and essentially free. At least equipment wise.
Regen has significant energy losses, however, so you should use it
sparingly, or at least knowledgeably.
Typical EV drivetrain losses are in the ~15% range, give or take.
Wha
On 12/31/2021 4:17 AM, paul dove via EV wrote:
Well, that’s not how efficiency is measured but I think I know what you mean.
The Wh per mile is mostly a function of weight. Aero starts to weigh in around
55mph. On conversions a good estimate is weight divided by 10. My car weighs
3100 lbs with
I think this one is beyond Harbor Freight. This is a _highly_ unusual
fastener.
If you can't find the proper socket, you may have to resort to
fabricating one, perhaps by milling or grinding five grooves to engage
the five nubs on the fasteners, inside a thick-walled socket of the
appropriate
Unlike an ICE, a more powerful electric drivetrain uses _less_ energy
under normal driving than a marginal HP drivetrain.
A large inverter and motor run more efficiently at low power because
they have larger conductors and less internal resistance than a smaller
inverter and motor. Driven side
Seriously?
You _seriously_ want to _hire_ someone to plug your Level 1 "trickle"
charger (that comes with every EV) into a regular wall socket?
Seriously?
Bill D.
On 10/24/2021 1:22 PM, Mark Abramowitz via EV wrote:
I know nothing about Level 1 charger costs, so did a quick Google, found this
If you consider the entire pack design, LFP can approach the specific
energy of NMC, NCA and other metal oxide batteries. Can't _quite_ get to
the same W-hrs/kg on a pack basis, but may be close. The LFP cells also
tend to have lower internal resistance, so the heat generated during
discharge a
There is zero hope for an AM radio to function correctly in a home built
EV.
You are inside a metal box next to a 100 kW unshielded broadband AM
radio transmitter.
Many of the early OEM EV's simply didn't have an AM radio at all, for
just this issue.
Bill D.
On 10/15/2021 1:03 AM, paul do
AM radio will pick up EMI via the antenna. A portable AM radio won't
work in a homebuilt EV. No hope.
A small portable AM radio is a very useful sensor for crude EMI leak
detection. Tune to a vacant portion on the dial and move the radio
around the device to find were EMI is leaking out. Works
Radio, particularly AM, is a lost cause on home conversions. The EMI and
RFI is just to difficult for the home converter to deal with. Takes
serious and time consuming work on shielding and filtering of the EV
components and wiring to get it down to a level where you can listen to
an ordinary A
Very fast electric streamliner by Vesco racing and powered by ReVolt
Systems:
/Here's How The Revolt Systems Streamliner Set The Electric Land Speed
Record At
Bonneville/https://jalopnik.com/heres-how-the-revolt-systems-streamliner-set-the-electr-1847798014
I had a bit of a laugh when the ar
Lussmyer via EV wrote:
On Fri Sep 10 07:52:03 PDT 2021 ev@lists.evdl.org said:
On 10 Sep 2021 at 13:28, Bill Dube via EV wrote:
Is it mandatory, though? It seems to be nothing more than a label inside
the fuel filler door with a date and a finger-wagging advisory, "Vehicles
with expired hyd
es/kwh under similar conditions.
On Fri, Sep 10, 2021 at 5:48 PM EVDL Administrator via EV
wrote:
On 10 Sep 2021 at 13:28, Bill Dube via EV wrote:
This replacement cost is another "nail in the coffin" of H2 fuel cell
vehicles. The cost of a battery replacement is less than the cost
ank system is really tight. Otherwise, I'm really
curious: why haven't there been any reported H2 explosions ?
Peri
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
-- Original Message --
From: "Bill Dube via EV"
To: ev@lists.evdl.org
Indeed, H2 is very buoyant in air and rises extremely quickly.
However, this means that it collects and concentrates at the high points
of the ceiling in an enclosed space. Typically, the garage door opener
is also in that space, as well as light fixtures, etc. The garage door
opener has relay
Typical high pressure cylinders must be re-certified every 5 years.
There are specific carbon fiber reinforced cylinders that can fall under
DOT regulation (SP-16320) which allows a longer span between
re-certification.
The typical re-certification procedure requires a physical inspection,
in
A high pressure hydrogen tank that holds more then 3000 cu ft
(uncompressed gas volume) _/*cannot*/_ be stored indoors without very
special ventilation equipment, etc. A fuel cell passenger car with a
range of 300 miles holds just shy of 2000 cu ft, so a truck would be
over that limit and could
This is, unfortunately, a "common" misconception. (So to speak :-) )
Yes indeed, the ground and neutral conductors are at the same potential.
The two conductors serve very different purposes, however.
If you connect the neutral conductor of an appliance to the ground
conductor by mistake, the
The round trip efficiency of the motor-inverter-battery-inverter-motor
is perhaps 50%.
The 15% number comes from the increase in range from having a car with
regen, versus one not having regen. In stop and go city driving, that
number can go much higher, thus the 25% increase in range.
Thus, re
It is very likely to be a high-resistance crimp on either the vehicle
side receptacle or the charger plug. It is more likely to be the charger
plug.
Alternatively, the pins on the vehicle may have been damaged by an
abused charge connector on a public charger. (It happens...)
Both have likely be
tly,
shows both BEVs and FCEVs reducing GHGs as compared to fossil combustion ICEs,
no matter the input energy.
- Mark
Sent from my Fuel Cell powered iPhone
On Aug 13, 2021, at 5:14 AM, Bill Dube via EV wrote:
Here is an article published today on "Clean Hydrogen". (Not so clean,
Here is an article published today on "Clean Hydrogen". (Not so clean,
according to the article. surprise surprise )
https://www.theguardian.com/environment/2021/aug/12/clean-fuel-blue-hydrogen-coal-study
From _all_ I've read, even in Scientific American, you are way ahead
simply using plain
The dynamic braking on DC lawnmowers is accomplished by the "shorting"
the motor with a length of wire, believe it or not.
When you turn it off, the power switch on the handle disconnects the
battery from the motor and connects a "resistor" to the motor which is
simply a bundled hank of perhap
I would suspect that the Tesla owned by the hotel manager, (or someone
in a position of power.)
They get a premium parking slot for their car, with charging, plus a
guard! Then write it off to the hotel and advertise it as a "perk" to
customers.
I would send a complaint to Hilton headquarter
The drag _force_ on your vehicle goes up as the square of velocity. F is
proportional to V x V
You go twice the speed, the drag force on your car increases by a
factor of four.
The _power_ (horsepower) requirement due to drag goes up as the cube of
velocity. HP is proportional to V x V x V
Sure, reduced emissions compared to the gas alternative, but a fuel cell can
perform so much better with zero emissions.
- Mark
Sent from my Fuel Cell powered iPhone
On May 8, 2021, at 5:42 PM, Bill Dube via EV wrote:
Gasoline engines are designed to run best on gasoline. They can barely be
conv
Gasoline engines are designed to run best on gasoline. They can barely
be converted to run on H2.
In a nutshell, H2 has an extremely low motor octane number (MON) of
about 60, and the compression must be reduced so much that the engine
makes very little power. The low charge density is a furth
A simple resistor won't limit the output voltage when the current tapers
off. (When the load resistance becomes larger.) It will still go to 16+
volts and ruin your battery.
A simple solution might be to place two, perhaps three, large diodes
(rectifiers) in series with the output.
You can e
Apache Reclamation. Awesome and bizarre surplus dealer. Worth a
visit just to look around.
You never know what you will find at Apache Reclamation. Seriously.
I suspect _they_ don't even know what some of the stuff they have is or
does.
Bill D.
On 4/19/2021 2:21 PM, Ricky Suiter
On a Leaf, the 12 volt battery never experiences the high starting
current that a typical starting battery does in an ICE.
It is used to supply longer steadier draws. Thus, I would opt for a
li-ion battery with similar A-hr capacity as the lead acid it is replacing.
Bill D.
On 4/19/2021 12:37
The sad fact is that no one actually "owned" an EV1 (with very rare
exceptions.) No doubt, many would still be on the road today if GM had
allowed private ownership.
I had the privilege of driving one when they were first introduced at
the EVS-14, and it was a very nice car.
I was told a bit
My hypothetical proposal was for EV drones (both tethered and perhaps
non-tethered) delivering packages from a truck (which could be an EV)
driven by a person. This would be safer as the driver could remain in
the truck, and not worry about slippery terrain, strained muscles,
viscous dogs, or i
In my opinion, the "delivery drones" have the wrong paradigm. The
delivery drone really doesn't need to travel long distances or carry
more than one package.
The real issue is the final 50-100 feet of delivery. The UPS driver has
to park the truck, get the package out of the back of the truck,
and when you pull over to take a picture of the beautiful
landscape, you discover you cannot restart your Tesla with your phone,
because you are out of cell phone coverage. :-(
Surprisingly common occurrence.
Bill D.
On 4/2/2021 10:14 AM, EVDL Administrator via EV wrote:
On 1 Apr 2021 a
Merchants are not allowed to add a surcharge for using a credit card.
The credit card folks won't allow it. They want you to spread the cost
over all your customers so it isn't so obvious to consumers how much the
service actually costs.
It is a gray area whether you can apply a cash, or "no c
Gordon,
We use a "CellPro" PowerLab 8 to initially balance, and cycle our
LiFePO4 packs in groups of eight cells (or less.)
http://www.store.revolectrix.com/Products/Cellpro-PowerLab-8-EC5-version/Cellpro-PowerLab-8_3299
About $250 and you will realize that you have been sleeping under a
rock
On 3/14/2021 5:18 AM, Willie via EV wrote:
His primary point was that bottom balanced voltage would drop off so
perspicaciously as the battery neared full discharge that there was
little risk of ignoring a few low cells as might be the case with top
balancing.
By "solving" the issue of to
Hi John,
Your very nice Orion BMS will balance your batteries in standard
manner ("top" balancing, so to speak.) Orion makes an outstanding (and
a bit pricey) battery management system, with all the bells and whistles
if you wish to use those features.
Attempting to perform some sor
What most folks don't realize is that Li-Ion batteries go out of
balance, (without a BMS,) and subsequently catch on fire, for a lot of
reasons.
Cell-to-cell differences in self-discharge is the primary culprit. In
poor quality cells, variations in manufacture "bake in" this
cell-to-cell diff
A big part of successful spot welding is ensuring the contact pressure
is repeatable. A great deal of effort is put into this because it really
matters. This system has zero provision for this important aspect.
The welds will either properly weld, explode, or not stick at all,
depending on the
In Colorado, you care about the loss of range when you change
altitude because you may not have enough range to; A) get to your
destination at the higher elevation, or, B) make the return trip from
some location at lower elevation.
For example, if you were to drive you brand new Leaf f
The typical welded pack has two spot welds on each end of the tab. This
is the minimum you can get with a resistance welder.
I typically put four welds on each end of each tab. I do this in two
welding operations well separated in time. This lets the heat dissipate
from the first weld. This is b
The thickness of the tab changes the amperage setting. Thicker equals
higher amperage.
Start out a very low amperage, and increase it until you get an
acceptable weld. Never start out at high amperage. Good way to ruin
electrodes and make a mess. (Ask me how I know.)
The negative end of the
There must be at least ten (10) of the identical vehicles manufactured
for it to be able to set a production record in NEDRA. (NEDRA has the
least stringent "production" class requirements, by the way. The
requirements for production land speed records are far more difficult.)
Have there final
The NOx pollution would be horrendous.
Oxides of nitrogen (NO, NO2, etc.) form when air is heated, like in an
engine (or in lightning, for example.) NOx is not particularly stable,
so it later breaks down in sunlight in the presence of other pollutants
to create ozone (O3). More NOX = more O3.
The cell won't last if you solder them. You can' help overheating the
terminals. This ruins the separators. They are designed to be spot welded.
You really need to use an inverter welder instead of a capacitance
welder. Should be 4000 amps peak (at least 3000 amps).
Bill D.
On 8/10/2020 6:29
We have learned the hard lesson that you should never rely on the thin
membrane on the case to provide insulation.
The cells originally had a cardboard tube around the case instead of a
thin layer of heat shrink. Much better for insulation, but considerably
bulkier
I'm guessing you just had
EVDL Administrator via EV wrote:
On 9 Jul 2020 at 14:30, Bill Dube via EV wrote:
They altered their focus away from EV batteries and towards other
markets that made more sense for LiFePO4 technology.
Obviously I'm not in any position to advise them, but I wonder if it might
be time for A123 to re
that made more sense for LiFePO4 technology.
Bill D.
On 7/9/2020 2:17 PM, Willie via EV wrote:
On 7/8/20 9:09 PM, Bill Dube via EV wrote:
A123 Systems has made high quality LiFePO4 for many years.
Does A123 survive? My recollection is that their major car customer
(can't come up wit
ecific power.
Bill D.
On 7/9/2020 1:11 PM, Alan Arrison via EV wrote:
Where are these mythical cells? They sure aren't from CALB.
Al
On 7/8/2020 8:06 PM, Bill Dube via EV wrote:
I don't think that LiFePO4 has made any remarkable gains in specific
energy.
What LiFePO4 does hav
I don't think that LiFePO4 has made any remarkable gains in specific energy.
What LiFePO4 does have is spectacular cycle life. If manufactured with
some degree of care, you get 15,000+, 100% SOC, 1C cycles @ 25 Celsius
from LiFePO4 without going below 50% of the original capacity. They just
ke
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