[Caevlist] battery recommendation
ullman at davidullman.com
Sat Mar 3 05:55:50 PST 2018
Some of you have been to my place to see the wind tunnel work I am doing for an electric airplane. I should have tunnel results by late summer and then start building a system for real airplane testing. In this regard I am starting to get serious about components for the full sized airplane. Large EDF (electric Ducted fan ) evolution for model airplanes is advancing at a rapid pace. There are now quiet 120mm units that will produce 15 lbs of thrust for a short period and 8 lbs continuous (limit is motor heat). Sixteen of these will make my little plane fly very well. I plan on starting with 4-6 on the plane with the IC engine still in place to gather data before removing the IC engine altogether, a year or more away on that. More on the project at www.davidullman.com/aeronautics <http://www.davidullman.com/aeronautics>
The one area I have done very little is batteries. During my test stage, later this year, each of the 4-6 motors needs battery power of:
* Nominal 45 V
* 25 Ah for 30 minutes of flight testing. The more, the better.
* 100 amp draw max, 50 amp continuous
* Near zero fire hazard.
* Batteries must be complete with BMS and charger. I have no interest in making batteries another area of research.
* Weight – as light as possible – I can go up to 200 lbs for batteries to power 4-6 motors but prefer something lighter (next gen batteries??)
It seems that I should be able to get someone to take a Leaf (or other) battery pack and help me reconfigure it this fall. Any ideas?
ullman at davidullman.com
From: caevlist-bounces at rdrop.com [mailto:caevlist-bounces at rdrop.com] On Behalf Of gburket at peak.org
Sent: Friday, March 02, 2018 9:29 PM
To: Alan Batie <alan at batie.org>
Cc: caevlist <caevlist at www.rdrop.com>
Subject: [Caevlist] EV conversion affordability
On the question of EV conversion affordability, I've outlined some areas to address this issue using the Nissan Leaf as an example:
I just priced two used 2013 Leaf EV drive systems(DS) at a salvage yard with 40-60k miles on them. The DS includes the charger(110V/220VAC input, DC fast charge input, AC pump control, and DC to DC), motor control inverter, motor, and reduction gear/differential. The cost is $600 each. Amazingly, $250 less than one of your new Leaf headlights! These DSs look small enough to be a pretty easy drop-in in most FWD vehicles, and possibly some mid-engine cars. Rated @ 110 hp, they have much less power than the 300-400HP Teslas. This DS does take the Leaf to over 90MPH, so it's probably good enough for smaller vehicles.
A company in CA is converting the Tesla 6S (~24V) battery modules to a 12S (~48V ) configuration. 8 of these in series are close to the Leaf's stock voltage and give 44 to 50 kWh of storage capacity, almost twice that of the stock Leaf's battery . This is with a battery weight close to the Leaf's stock battery weight, giving the vehicle ~2X the stock Leaf's range. The cost of the modified modules is pretty high, ~$1600/ module, for a total of ~$13,000. The price of the Tesla unmodified modules has plateaued recently at ~$1400. I suspect the price will drop as more modules come onto the market. A S100D complete battery pack recently sold on ebay for ~$11k. This takes the price down to ~ $700 per module-say in a group purchase. Batteries will probably always be the most expensive cost for a conversion.
Sensors, controls, BMS, general wiring, software mods, drive-line hook-up, safe battery installation:
Could someone else with more experience jump in here to give some idea of the costs involved?
Other conversion costs, labor?
Donor vehicle cost:
Again, does someone else have more experience in this area?
Please let me know your thoughts on this, Glenn
From: "Alan Batie" <alan at batie.org <mailto:alan at batie.org> >
To: "caevlist" <caevlist at www.rdrop.com <mailto:caevlist at www.rdrop.com> >
Sent: Tuesday, February 27, 2018 11:26:18 PM
Subject: Re: [Caevlist] And the rest advance a notch
On 2/27/18 7:24 PM, gburket at peak.org <mailto:gburket at peak.org> wrote:
> Can you wait for the Hyundai Kona crossover to come out. It looks like
> it will have good range and relaxed seating for us flexibility deprived
The Hyundai site doesn't say anything about it being a hybrid of any
sort... Oh, I see the announcement just today of the EV version, and
wow, that does look interesting. Another reason to go with a 1-year
lease - there's a lot coming out in a year!
> Soon you could pick your ICE vehicle(within a practical design range),
> and have people like Otmar, Kirk, or me convert it for you.
That's an interesting idea, but unlikely to be affordable...
Caevlist mailing list
Caevlist at rdrop.com <mailto:Caevlist at rdrop.com>
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Caevlist