Re: [EVDL] Bright Way vs. Universal Power Group

2019-02-19 Thread Ken Olum via EV
   From: Lee Hart 
   Date: Mon, 18 Feb 2019 22:56:12 -0600

   You may want to check to see if Bright Way is just some outfit that buys 
   nameless batteries in China and slaps their own labels on them.

How would I find out for sure?

   From: brucedp5 
   Date: Mon, 18 Feb 2019 20:35:21 -0600 (CST)

   The evdl archive shows you have asked about batteries for your 48V (6
   group 24 8V batteries).

That was the original configuration, but I went to 4 12V AGM instead.
I've lived plenty of my life with flooded batteries and I would not want
to go back to them.  I especially didn't like the acid mist.

In truth I don't care that much about cycle life -- mostly about
calendar life.  I have had my UB AGMs for 10 years.  They are down
to maybe 25% of their original capacity, but still usable if you don't
mind charging often.

Ken
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[EVDL] Bright Way vs. Universal Power Group

2019-02-18 Thread Ken Olum via EV
Hi, all.  I'm trying to replace the UB121350 AGM batteries that I have
in my Electric Ox.  I ordered new ones from Wholesale Batteries Direct,
but they are out and Universal Power Group is out at the warehouse also.
They recommended that I get the Bright Way Group BW EV12-155A instead,
for a few dollars more.  Anyone have any experience with Bright Way?  I
have had good experience with Universal Power, and know nothing about
Bright Way.  The specs on their battery claim 1000 cycles to 50% DOD,
which is pretty impressive for AGM, though that is not so important in a
lawn tractor that you don't use every day.  They claim 10 year calendar
life, also quite impressive and more relevant to me.

Ken
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Re: [EVDL] My Experience with eMotorWerks

2019-01-08 Thread Ken Olum via EV
I bought a Pro 40 in 2015, even though I only have an 20A outlet in my
garage and upgrading is not simple because the garage is connected to
the house by a buried cable.  I got it with the idea that I might take
it with me and plug in to people's range outlets or at campgrounds,
though I never have.

I adjusted the maximum current to 16A using the app, but every so often
the charger would trip the circuit breaker and I would wake up to an
uncharged car.  I was completely unable to get any help from eMotorWerks
support.  Fortunately, this charger was open source. (Is it still?  I
couldn't find the source today.)  Reading the source I discovered that
when the charger cannot connect to the server for 90 seconds, it forgets
the server current limit.  What an awful design!  It should keep the
last current limit that it saw.

Fortunately I was able to open up the charger and adjust the
potentiometer that gives a hardware limit on the current draw, so now
I'm able to charge reliably, no thanks to eMotorWerks.  If I ever wanted
to use it for higher currents I would have to adjust the hardware
again.

Ken
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Re: [EVDL] Smearing with coal (again)

2018-01-04 Thread Ken Olum via EV
   From: Robert Bruninga 
   Date: Wed, 3 Jan 2018 16:52:46 -0500
 
   if one generates say 10MWhrs per year of solar and use 10MWhars per
   year of electricity, then 100% of  your energy is completely fossil
   fuel free.

I agree that you are entitled to brag that you used no fossil fuels in
this case.  But now suppose that you trade your electric car for a gas
car.  You pollute.  But you also use, say, 1 MWh less of the energy that
you generate.  It goes out to the grid instead.  Fossil fuel plants
don't need to run to generate it.  They pollute less.  This partly
compensates for the additional pollution that you generate with your
gas car.

The point I'm trying to make is that if you are comparing electric car
vs. gas car, you should compare the pollution generated by the car with
the pollution generated by producing the electricity, even if you
yourself have solar panels.

The only way that you should compare the pollution of the gas car
against zero for the electric car is if the comparison is (gas car) vs.
(electric car and new solar panels to charge it).  For example this is
the right comparison if you size your PV system to your needs including
your cars.

Ken
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Re: [EVDL] Smearing with coal (again)

2018-01-03 Thread Ken Olum via EV
   From: Robert Bruninga 
   Date: Wed, 3 Jan 2018 11:15:28 -0500

   AND more than half of all EV buyers also buy CLEAN ELECTRICITY,
   either from their own solar...

The fungibility of electric power makes it difficult to make a clear
statement about this.  It's true that if I charge on a sunny day the
electricity flows straight from my solar panels to my car.  If I had a
gas car, the power generated from the panels would go instead to
displace someone else's electricity usage, generated mostly by fossil
fuel plants.  Thus having solar panels does not exempt me from the fact
that using electricity in my car leads to more fossil fuel consumption
than if I didn't use it, everything else being equal.

Ken

P.S. If anybody is an expert on voluntary renewable energy set-asides in
carbon emission cap-and-trade systems, I'd appreciate a conversation,
but email me separately as it is not really relevant to this list.
Thanks.
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Re: [EVDL] Best year of Leaf to buy used.

2015-11-12 Thread Ken Olum via EV
We recently bought a 2013 with chademo & 6.6kw charger for $10,800 list
(plus $500 dealer charge, etc.) and are pretty happy with it.  Before
2013 there was no percentage battery charge readout on the dash.  After
2013 there was no "charge only to 80%" option.

Recent battery packs are larger, though.

Don't make the mistake that we made of thinking that the dashboard
battery health display will actually tell you the battery condition.
Apparently when the car is serviced this display can get reset to show
full health, even if that isn't true.  Instead, go armed with an
OBDII bluetooth adapter and the Leafspy app on your phone, and you can
find out the truth.  If you have a friend with a Leaf, first make sure your
adapter works and learn how to use the app.

Ken
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Re: [EVDL] Emotorworks (Juicebox) lack of customer support

2015-10-16 Thread Ken Olum via EV
   Date: Fri, 16 Oct 2015 08:38:03 -0400
   From: EVDL Administrator via EV 

   Given that, my questions would be:

   1. Why does it need to talk to their servers at all?  

I don't know why they did it this way.  I would be much happier if I could
communicate directly with the box, without going through their servers.

   3. What happens to it if Emotorworks goes out of business?

I think if Emotorwerks goes out of business, you either have to do a
bunch of technical work or your box has effectively been downgraded to
the model without digital communications, in which case you have wasted
$100.

   If they've encrypted its software (many do) and you reverse-engineer it to 
   get it working again, or to make it work the way you want it to, you're in 
   violation of the DMCA and they can sic the law on you.

They claim it is open source, so presumably there is no legal issue.  But
this claim does not seem to come with any actual access to the source,
so in terms of practical value it may be meaningless.

   The nice thing about EV conversions is that they don't need fancy $600 
   networked online charging cords.  They do just fine with a $50 SJ cord and 
   plug, and a 240v or 120v receptacle.

That's true, but on the other hand all J1772 chargers have to obey a
single standard for limiting the charging rate, whereas the chargers
used in conversions all have (or don't have) their own procedures for
doing this.

   Date: Fri, 16 Oct 2015 07:56:11 -0500
   From: Willie2 via EV 

   ...One major, for me, problem is that the display they use on
   chargers and the premium JBs is very difficult to read.

Fortunately (?) for me, my unit does not have the display.

   Date: Fri, 16 Oct 2015 11:37:01 -0400
   From: Jay Summet via EV 
   
   My understanding is that once you set the charging amp limit, it will 
   not change until you modify the setting again.

If this were true, I would not be having this problem.  The charging
limit is stored on the the server.  Once you set it, the server will
always remember it.  But under certain circumstances (I wish I knew
exactly which), when the box can't reach the server, it forgets the
limit.

Ken
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[EVDL] Emotorworks (Juicebox) lack of customer support

2015-10-15 Thread Ken Olum via EV
At the end of June I bought the JuiceBox 40 Pro EVSE from Emotorwerks.
I paid $600, and I think that's enough that I'm entitled to a little
customer support.  But I've 4 sent requests to their support address and
never received a satisfactory answer.  In some cases I got a reply, but
the reply was "so-and-so is the expert on this and will get back to you
and answer your question" and then I never heard from so-and-so.

Before sending this message, I complained to them about the fact that I
wasn't getting any support, and that complaint also went unanswered.

So, at this point, I feel I should warn other EV drivers not to buy from
Emotorwerks if you want to be able to ask any questions or get any help
with your equipment.  I'm sorry to do it.  I thought this was a
promising company with an interesting piece of equipment at an
attractive price.

They are very proud of the fact that it's open source.  Anyone know
where to find the source?  I guess I should read it if I ever want to
get an answer to my main question, which is "How does the unit manage
the charging current limit in cases where the connection to
Emotorwerks's servers is not completely reliable?"

Ken Olum
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