Search found 226 matches

by peterperkins
Jan 18, 2018 3:25 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

Thanks to all for the input.
I did have some errors in the voltage readings which made the calculation difficult.
Now resolved and that bit works OK.
by peterperkins
Jan 16, 2018 1:42 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

The delay at the beginning is the time between me pressing the capture button and me twiddling the knob on the variable output dc power supply. The ramp up and down detection is real time when watching it live. The delay was mine.
by peterperkins
Jan 15, 2018 12:00 pm
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

I thought it was more useful that it was all together in context and in the zip file, or perhaps you hadn't seen it. Of course I don't expect people to dig around to help if they can. 30v = 3v per cell = 756,75C,75A,75C 75C,75E,760,761 76B,764, 40v = 4v per cell = 9DD,9E2,9DF,9E2 9E4,9E3,9E5,9E7 9F0...
by peterperkins
Jan 15, 2018 5:29 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

It's in the attachment I posted.
by peterperkins
Jan 15, 2018 3:20 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

On a slightly different theme when i connected the BMS board to a fake battery it gave cell voltage readings in the CAN data. The BMS reads ten cells per board and is based on the common LTC 6803/4 series chips. Attached are the csv log files from the canbus with several voltages and variations. I l...
by peterperkins
Jan 15, 2018 3:08 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

Perhaps I mislead you then. Apologies. It's not the actual raw canbus bits crc, but a crc or security check related directly to the 8 data bytes. One or more of the 8 bytes (i.e last two being a security/crc byte/s) I suspect the last byte is a data bytes CRC. The penultimate byte may be a security ...
by peterperkins
Jan 15, 2018 2:21 am
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

Re: BMS Canbus data

It's from an OEM lithium battery pack in a Honda Civic Hybrid.
by peterperkins
Jan 14, 2018 3:54 pm
Forum: Battery Technology
Topic: BMS Canbus data
Replies: 14
Views: 366

BMS Canbus data

I'm working on a microcontroller project that might eventually get transferred to a micromite but I am struggling to understand a CANBUS crc and security type code formulae. I sampled some repeating CANBUS data from a working BMS system. I'm wondering how the two bytes at the end of the packet are g...
by peterperkins
Jun 30, 2017 1:48 am
Forum: Battery Technology
Topic: Shunting power between packs Ideas.
Replies: 7
Views: 372

Re: Shunting power between packs Ideas.

Thanks for the comments. OK a few more details.. This is a Honda Insight MK1 project. Pack A is 50S Lithium supercaps. It's operating range is 110-190V (3.8v per cap max) Pack B is 50S (7-8 year old) A123 pouch 20ah cells. Highish IR. It's operating range is 110-180V approx. (3.6v per cell max) I do...
by peterperkins
Jun 29, 2017 3:03 am
Forum: Battery Technology
Topic: Shunting power between packs Ideas.
Replies: 7
Views: 372

Shunting power between packs Ideas.

Lets assume we have two 180V ish battery packs A & B that we want to connect in parallel but in a controlled fashion. They won't always be at the same voltage and I want to control; the power flow back and forth between them as they fluctuate. A will sometimes be higher than B by say upto 50V and vi...
by peterperkins
May 12, 2017 2:34 am
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

Re: LIC Lithium Supercapacitors

Probably not is the simple answer. But... I had access to the caps at zero cost. I'm interested in them as an experimental base for further research on the Insight IMA/Capacitor/Battery systems. I enjoy tinkering and learning about stuff. I might combine the caps with that old A123 50S pack i used b...
by peterperkins
May 10, 2017 4:31 am
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

Re: LIC Lithium Supercapacitors

The insight Mk1 gets a lot of it's fuel efficiency from the lean burn engine system. The IMA side makes only a relatively small contribution to the total. However when you consider the appalling SD rate of older nimh cells and the fact in average terrain you don't need long bursts of assist/regen. (...
by peterperkins
May 10, 2017 4:26 am
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

Re: LIC Lithium Supercapacitors

The manufacturer says 0.5ohm per cap so that means 25mohm for my 50S pack,but i was erring on the side of caution and rounding it up..
I probably don't have the equipment to measure the ESR for the whole package inc contactors/fuse etc. But I might look at that..
by peterperkins
May 10, 2017 4:20 am
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

Re: LIC Lithium Supercapacitors

It's <50mohm for the whole pack (50 caps in series) not counting interconnections.

It's actually probably less than that. The quoted esr for a single cap is 0.5mohm. :)
by peterperkins
May 10, 2017 2:14 am
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

Re: LIC Lithium Supercapacitors

This is what they look like naked.
20170510_080731.jpg
20170510_080731.jpg (40.83 KiB) Viewed 554 times
by peterperkins
May 09, 2017 1:04 pm
Forum: Battery Technology
Topic: LIC Lithium Supercapacitors
Replies: 9
Views: 672

LIC Lithium Supercapacitors

I thought this might interest members on here. I'm not aware of any other supercapacitor equipped road going vehicles in the UK apart from my MK1 Honda Insight. The ageing old Nimh technology hybrid battery pack has been replaced with a Lithium Supercapacitor pack made up of 50 x 2200F Capacitors. T...
by peterperkins
Jun 06, 2015 1:57 am
Forum: Battery Technology
Topic: Which BMS for 50S Lifepo4 pack.
Replies: 5
Views: 297

Re: Which BMS for 50S Lifepo4 pack.

I'm interested but keener on something already available off the shelf.
Someone on here must be using something suitable. :?
by peterperkins
Jun 05, 2015 5:27 am
Forum: Battery Technology
Topic: Which BMS for 50S Lifepo4 pack.
Replies: 5
Views: 297

Which BMS for 50S Lifepo4 pack.

I'm interested in BMS options for a 50S Lifepo4 pack. Nominal 3.3V per cell. Now I must make it clear. I am not interested in any BMS with a bunch of large mosfets on the board, as I do not want the BMS directly controlling the load/charge current. I want simple signal/logic high low outputs/or seri...
by peterperkins
Jun 23, 2014 1:55 pm
Forum: E-Bike General Discussion
Topic: Help me Endless Sphere forum - you're my only hope
Replies: 19
Views: 978

Re: Help me Endless Sphere forum - you're my only hope

Am I the only one who got the Star Wars reference?
by peterperkins
May 29, 2014 8:34 am
Forum: E-vents
Topic: 2014 UK Honda Insight gathering Sept 6/7th
Replies: 3
Views: 648

Re: 2014 UK Honda Insight gathering Sept 6/7th

Please update the IC forum thread so we can see who is coming.

Thanks
by peterperkins
May 25, 2014 10:44 pm
Forum: E-vents
Topic: 2014 UK Honda Insight gathering Sept 6/7th
Replies: 3
Views: 648

2014 UK Honda Insight gathering Sept 6/7th

2014 UK Insight gathering Sept 6/7th http://www.insightcentral.net/forums/hybrid-social... Avoncroft Museum of Historic Buildings in Bromsgrove. It is small and quiet with an excellent Edwardian Tea Room. Plus the national collection of Telephone Kiosks! WHERE? Bromsgrove is on the M5, M42 interchan...
by peterperkins
May 17, 2014 12:51 am
Forum: Items for Sale - Used
Topic: 50 x 40Ah Lifepo4 HIPOWER Cells & BMS UK
Replies: 24
Views: 2563

Re: 50 x 40Ah Lifepo4 HIPOWER Cells & BMS

Change of plan again and now moving house in July and need the space.

For sale again £1000 cash UK buyer collects. No postage etc offered.

Mrs does not want them cluttering up the new house. :cry:
by peterperkins
May 17, 2014 12:49 am
Forum: Items for Sale - Used
Topic: For Sale A123 OEM 28S3P Packs x 4
Replies: 1
Views: 415

For Sale A123 OEM 28S3P Packs x 4

28S3P blocks x 4 Might sell. I'm moving house and need the space. http://endless-sphere.com/forums/viewtopic.php?f=14&t=38901 I got lucky and got four good packs. They have +50Ah capacity at 1C 60A rates. I paid £4000 inc import duties to UK. Price £3000 cash on collection only. No offers, trades or...
by peterperkins
May 17, 2014 12:47 am
Forum: Battery Technology
Topic: Dr.Bass Steveo found 7s3p Module! Awesome Price!!
Replies: 592
Views: 59509

4 x 28S3P for sale

28S3P blocks x 4 Might sell. I'm moving house and need the space. I got lucky and got four good packs. They have +50Ah capacity at 1C 60A rates. I paid £4000 inc import duties to UK. Price £3000 cash on collection only. No offers, trades or shipping etc. My purpose built BMS boards for these packs a...