Search found 48 matches

by Ecky
Jan 30 2019 1:58am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

Any suggestions on a source for LTO cells?
by Ecky
Jan 27 2019 10:12am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

It shouldn't be difficult to set up a semiconductor relay. Get in the cold car that has been sitting for a week or two, flip the switch that connects the small Lithium pack to the supercapacitors, wait a couple minutes for the battery to charge the super-caps, then start the car. Aside from poor co...
by Ecky
Jan 27 2019 6:51am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

I've been wondering about this too. The super capacitors sho I led be able to handle the extreme cold, but I am wondering about a battery to charge the caps. If you start the car at least once a week, I'm fairly sure you wouldn't need a backup battery, but even if you do, the lithium battery wouldn...
by Ecky
Jan 26 2019 10:18am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

Been a while since I looked at this post, but somewhat unrelated to my original question, I decided to ditch my car's 12v battery when it passed away early this winter, and instead moved to a bank of supercapacitors and a LiFePO4 battery to extend standby time. https://i.imgur.com/NU4kebLl.jpg https...
by Ecky
Oct 15 2018 3:02pm
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

I'm mostly concerned about charging during these temps. Will check out A123's though.
by Ecky
Oct 14 2018 9:22am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

This is an automotive application. Non-removable, otherwise temperature wouldn't concern me.
by Ecky
Oct 14 2018 7:15am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Re: Which battery chemistry for extreme climates?

Thanks. I understand most EVs have heating elements in the batteries which turn on in northern climates? What do those EVs do that don't have heating elements? Do you just not get any regen until the battery warms up? Can you not charge them at all?
by Ecky
Oct 14 2018 6:03am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1817

Which battery chemistry for extreme climates?

Hi all, I'm trying to determine which battery chemistries would be safe for year-round use in Vermont. We get temperatures here as low as -40c occasionally, and there are typically several weeks each year where the daily high temperature is below -20c (approx 0f). My understanding is that most lithi...
by Ecky
Jul 21 2018 4:56pm
Forum: Items for Sale - Used
Topic: 72v e-trike, Vermont
Replies: 3
Views: 617

Re: 72v e-trike, Vermont

Sold!
by Ecky
Jul 13 2018 7:16am
Forum: Items for Sale - Used
Topic: Cycle Analyst v3, Phaserunner, accessories
Replies: 6
Views: 950

Re: Cycle Analyst v3, Phaserunner, accessories

SwampDonkey wrote:
Jul 13 2018 7:02am
How much for the Phase Runner?
Image

:wink:

Open to offers.
by Ecky
Jun 23 2018 2:31pm
Forum: Items for Sale - Used
Topic: Cycle Analyst v3, Phaserunner, accessories
Replies: 6
Views: 950

Re: Cycle Analyst v3, Phaserunner, accessories

Cycle analyst and its accessories sold.
by Ecky
Jun 23 2018 1:16pm
Forum: Items for Sale - Used
Topic: 72v e-trike, Vermont
Replies: 3
Views: 617

72v e-trike, Vermont

SOLD Selling my 72v etrike. Based on a Sunseeker EZ-TAD SX. Currently has a 72v 40a Cyclone controller from Luna Cycle, 72v 13.4Ah battery, and a Leafbike 1500w motor (90% efficient) laced to a 20" rim. Batteries consist of 6x 36v 4.4ah 18650 sub packs using Samsung ICR18650-22H cells, about 10 mont...
by Ecky
Jun 23 2018 12:44pm
Forum: Items for Sale - Used
Topic: Cycle Analyst v3, Phaserunner, accessories
Replies: 6
Views: 950

Cycle Analyst v3, Phaserunner, accessories

Cycle analyst sold Phaserunner SOLD I purchased these last fall, had some fun with them for the last ~8 months, now I'd like to pass them along. Phaserunner has some scratches and scuffs on the epoxy on top, can take a closer picture if you'd like. I'd like to get $120 for the CA and all accessorie...
by Ecky
Apr 02 2018 7:34pm
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 894

Re: FS (Vermont) - MAC 8T cassette on 20"

SOLD! Sorry for not updating.
by Ecky
Mar 25 2018 10:16am
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 894

Re: FS (Vermont) - MAC 8T cassette on 20"

Just had a PM for the whole wheel. Pending sale.
by Ecky
Mar 24 2018 5:44pm
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 894

Re: FS (Vermont) - MAC 8T cassette on 20"

I took it to a bike shop to have the bearing swapped as I didn't have a proper puller. It was on the side opposite the phase wires, so they didn't need to be cut. The bike shop did a great job and it works perfectly. The bearing was defective from the factory and with the replacement it runs quietly...
by Ecky
Mar 21 2018 10:15am
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 894

Re: FS (Vermont) - MAC 8T cassette on 20"

Two hundo is a pretty good price for a complete wheel. I bet that thing rips in a 20" wheel. GL with the sale. It really does. The folding bike I put it on to test it was much better at doing wheelies than going in a straight line, even at 36v/12a. I blame the not-very-progressive throttle of the c...
by Ecky
Mar 19 2018 12:20pm
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 894

FS (Vermont) - MAC 8T cassette on 20"

EDIT: SOLD! Ordered from Em3ev on August 18th, 2017: MAC 8T UPGRADE (temp sensor) w/135mm axle 1500w + 8T wind + Alex DM18 rim + 13G Saphim Black spokes + 7 speed Shimano cassette , accepts disc brakes Originally $352 + shipping Has about 75 miles on it. When I received it, one of the bearings was ...
by Ecky
Jan 05 2018 6:05am
Forum: E-Vehicles General Discussion
Topic: 2000 Honda Insight: Convert, or No?
Replies: 50
Views: 7996

Re: 2000 Honda Insight: Convert, or No?

Going to subscribe to this thread, since I'm an Insight owner as well and have been playing for BEV conversion ideas for years. I'm waiting on something major to go out in it to have the excuse, but 250k miles later it still has had only oil changes, tires, one 12v battery and some balancing grid ch...
by Ecky
Jan 04 2018 3:31pm
Forum: E-Vehicles General Discussion
Topic: Would a wind powered car work?
Replies: 21
Views: 2064

Re: Would a wind powered car work?

To rephrase what others have said, your grille + pinwheels + generator will add drag to your low-cd vehicle. Windmills generate energy by creating drag. You will always have more drag added than the energy created.
by Ecky
Dec 28 2017 11:34am
Forum: E-Bike General Discussion
Topic: Reliable 4 season car replacement practicalities
Replies: 19
Views: 2085

Re: Reliable 4 season car replacement practicalities

I built a full velomobile "fairing" around my recumbent trike with brake lights, turn signals and (not in the picture below) running lights and a great headlight. It tops out around 45mph and will go 50-60 miles on a charge in good weather without pedaling. Some thoughts: The velo shell keeps me mos...
by Ecky
Dec 19 2017 2:06pm
Forum: E-Bike General Discussion
Topic: Advise on First ebike build
Replies: 6
Views: 892

Re: Advise on First ebike build

I'd get the size that fits your bike. With a given motor winding, a smaller wheel will have a lower top speed but better acceleration. Most direct drive motors I believe will be more efficient with a smaller wheel, because they can run at higher RPM, but it's not like you can run a 20 inch wheel on ...
by Ecky
Dec 18 2017 2:51pm
Forum: E-Bike General Discussion
Topic: Advise on First ebike build
Replies: 6
Views: 892

Re: Advise on First ebike build

I'm far from an expert, but here are some thing's I've gathered: Geared hub motors have moving parts which can fail, and no regenerative braking unless the clutch seizes up. They tend to be more powerful for their size and weight, or lighter and smaller for the same power. If you're frequently accel...
by Ecky
Dec 15 2017 11:36am
Forum: E-Vehicles General Discussion
Topic: Madness. Why such slow penetration for hybrid?
Replies: 67
Views: 6133

Re: Madness. Why such slow penetration for hybrid?

Glad you cleaned it up, thanks. Thinking out loud here, one reason for limited adoption may have been price for lithium batteries? My limited knowledge on the topic suggests that NiMH, which was preferred until maybe 2011, can take high charge currents but has a whole host of other issues (self disc...