Search found 3692 matches

by Richo
Thu, 12 Sep 2019, 12:43
Forum: Scooters, mopeds and electric toys
Topic: Upgrading 24V mobility scooter from PB to LiFePO4 batts
Replies: 16
Views: 465

Re: Upgrading 24V mobility scooter from PB to LiFePO4 batts

Something like this maybe https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F323696643887 So they are 18650's... It's title is 24V but the description is 10S5P. 10S would be 36V. Each cell in every battery goes through a strict testing process for capacity, voltage,...
by Richo
Tue, 10 Sep 2019, 12:54
Forum: General EV Discussion
Topic: Toyota Hiace poptop conversion
Replies: 17
Views: 1746

Re: Toyota Hiace poptop conversion

Faron Peckham wrote:
Mon, 09 Sep 2019, 12:00
Regenerative braking could be a game changer on this route. Maintenance costs were really taxing, so going electric seems like it could really change the economics.
So AC it is.

Do you have any typical Specs on your vehicle (kW)?
by Richo
Tue, 10 Sep 2019, 12:51
Forum: General EV Discussion
Topic: Toyota Hiace poptop conversion
Replies: 17
Views: 1746

Re: Toyota Hiace poptop conversion

Faron Peckham wrote:
Mon, 09 Sep 2019, 12:00
I think 100 km of range seems appropriate.
So if you have access to Leaf cells you'd need 40 as a bare minimum.
That's be 20S2P (152 volts) which could be a bit high for some controllers.

If speed is not your thing on these tours then you could go 3P.
15S3P (114 Volts+).

Or 10S4P (76 Volts+).
by Richo
Tue, 10 Sep 2019, 12:38
Forum: General EV Discussion
Topic: Toyota Hiace poptop conversion
Replies: 17
Views: 1746

Re: Toyota Hiace poptop conversion

Faron Peckham wrote:
Mon, 09 Sep 2019, 12:00
more and more salvage EV parts are available each day.
Send them to us in Oz :lol:
by Richo
Mon, 09 Sep 2019, 12:41
Forum: Scooters, mopeds and electric toys
Topic: Upgrading 24V mobility scooter from PB to LiFePO4 batts
Replies: 16
Views: 465

Re: Upgrading 24V mobility scooter from PB to LiFePO4 batts

Adverse Effects wrote:
Sat, 07 Sep 2019, 21:00
there is a LOT of good info there
Wow 173 pages - I think that's longer than any thread here. :o
by Richo
Mon, 09 Sep 2019, 12:37
Forum: Scooters, mopeds and electric toys
Topic: Upgrading 24V mobility scooter from PB to LiFePO4 batts
Replies: 16
Views: 465

Re: Upgrading 24V mobility scooter from PB to LiFePO4 batts

HuffnPuff wrote:
Thu, 05 Sep 2019, 14:36
would it be possible to just buy some smaller lead batteries?
Yep most SLA can do about 3C.
So for 70A /3C => 23Ah

That'd be ~8kg per battery.

So ~16kg and $210.

The down side is you'd be lucky to get 10Ah at 3C - more like 7.5Ah.
But 3C would be the worst case.
by Richo
Thu, 05 Sep 2019, 13:09
Forum: Scooters, mopeds and electric toys
Topic: Upgrading 24V mobility scooter from PB to LiFePO4 batts
Replies: 16
Views: 465

Re: Upgrading 24V mobility scooter from PB to LiFePO4 batts

30A/10Ah=3C continuous and 70A/10Ah is 7C peak. Using 18650's will be quite a bit of work assembling a pack so I'd probably not recommend it. Not to mention the voltages don't mach your SLA setup. A Samsung 18650 "High output" is rated for about 8C. 1.44kg for 8S4P=32 cells $300 LiFePO4 are 3.2V ea ...
by Richo
Wed, 04 Sep 2019, 12:28
Forum: Admin Notices
Topic: Avartarless
Replies: 4
Views: 249

Re: Avartarless

Ah yeah that fixed it - thanks!

Seems its the only time I get to see my Handi :(

I'll have to get back on it :oops:
by Richo
Tue, 03 Sep 2019, 12:33
Forum: Admin Notices
Topic: Avartarless
Replies: 4
Views: 249

Re: Avartarless

I see the picture in my account settings.
So you see my avatar in these posts?
by Richo
Mon, 02 Sep 2019, 12:48
Forum: Admin Notices
Topic: Avartarless
Replies: 4
Views: 249

Avartarless

One day my Avatar picture disappeared - last few weeks.
I didn't change any settings.

Where did it go?
by Richo
Mon, 02 Sep 2019, 12:46
Forum: Charging Infrastructure
Topic: Solar day parking with AC charging
Replies: 13
Views: 383

Re: Solar day parking with AC charging

Work places with solar are still unlikely to cover their energy needs - even if the carpark was added. So having free solar for customers/employees at the employers expense is unlikely to happen. If it concerns you then get as much solar as you can on your house and store the surplus - preferably 10...
by Richo
Fri, 30 Aug 2019, 13:04
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed the OTP

Logically it fixes the problem.
dead battery AND dead owner = no problem
by Richo
Fri, 30 Aug 2019, 13:00
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed myself

HLG-80H-C700A ~$60 5V 1A plugpack with an LM317 and 2.4 Ohm 5W series resistor. $10 in parts and $100 stuffing around. Rectify mains, filter and 510R 150W resistor. That'd cost ~$50. ... this "theoretical circuit" would kill any user I'll update the cost... Rectify mains, filter and 510R 150W resis...
by Richo
Fri, 30 Aug 2019, 12:52
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 25
Views: 891

Re: How to tell a kilowatt hour from a kelvin week henry

It means the inverters were rated to deliver 100 MW of power, but for how long? Correct. In the good 'ol days the assumption was that it would be continuous-forever like all other power stations. So the only consideration IS power not capacity. Like some engineers they live in a box isolated from t...
by Richo
Fri, 30 Aug 2019, 12:44
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 25
Views: 891

Re: How to tell a kilowatt hour from a kelvin week henry

I regularly see Mm rather than mm - Umm that's a BIG difference people

OR the other I hate is Mega-milli candella.
Compounded prefixes.
:roll:
by Richo
Wed, 28 Aug 2019, 12:39
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed my cells

antiscab wrote:
Wed, 28 Aug 2019, 12:32
I would have thought even 10Ah would be enough to change over (20 hrs or so). likely even less
True.
If the last 5% is on the slippery slope of the discharge curve that's about 8Ah.
I'd still leave it longer in this case.
by Richo
Wed, 28 Aug 2019, 12:34
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed my cells

WARNING - DON'T DO THE FOLLOWING:
:o

Rectify mains, filter and 510R 150W resistor.
That'd cost ~$50.

Just covering all the options :lol:
by Richo
Wed, 28 Aug 2019, 12:25
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed my cells

At 0.5A charging the whole pack at once is still going to take ~10 days before you can swap over to the normal charger.
by Richo
Tue, 27 Aug 2019, 13:04
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 824

Re: HELP PLEASE I think I killed my cells

A meanwell power supply HLG-80H-C700A should do it. 64-129V out 0.42-0.70A out ~$60 It will charge at 0.5A up to a point where your regular charger can take over. You have to makes sure you pack is above the 64V minimum. https://www.meanwell.com/productPdf.aspx?i=283#1 The other option is to get a 5...
by Richo
Mon, 26 Aug 2019, 12:33
Forum: Nissan Leaf
Topic: Home charging
Replies: 24
Views: 753

Re: Home charging

brendon_m wrote:
Mon, 26 Aug 2019, 11:34
... measure charge rate is km per hour
kph
Classic :lol:

I agree km/hr makes sense.

Still the funny looks I'd get if I said I charge at 15kph.
by Richo
Thu, 22 Aug 2019, 12:18
Forum: Batteries, charging, management and monitoring
Topic: Battery cooling academic paper
Replies: 6
Views: 283

Re: Battery cooling academic paper

My concern is where is the "cooling" coming from.
45 Degrees in the shade.
55 Degrees in the sun.
Just blowing hot air around has its limits.
by Richo
Wed, 21 Aug 2019, 12:42
Forum: For Sale/Wanted
Topic: 20 x Leaf Cells
Replies: 25
Views: 1225

Re: 20 x Leaf Cells

Still populating.
I'm still aiming to starting testing the cells sometime next week.
by Richo
Wed, 21 Aug 2019, 12:37
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 68
Views: 2409

Re: Soyachips’ Electric FZR250

https://www.aliexpress.com/item/30pcs-20000-Cycles-2-3v-30ah-35ah-40ah-66160-LTO-2-4v-Lithium-Titanium-Oxide-Battery/32979869826.html The link I provided indicated 6C/15C by the seller. So the data soyachips used was based on that. I understand that this is your experience but is there any actual t...
by Richo
Mon, 19 Aug 2019, 13:10
Forum: Batteries, charging, management and monitoring
Topic: Battery cooling academic paper
Replies: 6
Views: 283

Re: Battery cooling academic paper

In most cases this isn't an issue. Only for hybrids pushing tiny battery packs to their limits. Heat pipes and PCM all sound quite expensive. I'd want to see a comparison over traditional cooling spreader plates or thin water cooled plates. https://www.ekwb.com/shop/media/wysiwyg/EK-FC1080_GTX_Ti_NP...