Search found 46 matches

by ENNOID
Feb 10 2019 2:13pm
Forum: Large EV General Discussion
Topic: Electric Snow Blower (Gravely)
Replies: 7
Views: 408

Re: Electric Snow Blower (Gravely)

Funny and very similar to my homemade battery powered snow blower:

https://endless-sphere.com/forums/viewt ... =7&t=98592
by ENNOID
Feb 07 2019 7:50pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

The BOM for LTC6811 is completed and the order on digikey is ready . I can provide a link to share my basket on github ennoid-BMS. The new LTC6813 IC are still scarse right now on mouser and digikey, and I will wait before working on the board. Anyway for testing LTC6811 will be cheaper and easier. ...
by ENNOID
Feb 07 2019 8:40am
Forum: E-Vehicles General Discussion
Topic: 10 Kw Homemade Battery powered snowblower
Replies: 8
Views: 273

Re: 10 Kw Homemade Battery powered snowblower

Yeah, it is quite handling surprisingly well until now despite the weight. In fact, it pushes against the compacted snow incredibly well and independent wheel control makes cornering easy. Reverse is also done just by moving a switch, so no problem there... Next upgrade would be to install tracks in...
by ENNOID
Feb 06 2019 5:51pm
Forum: E-Vehicles General Discussion
Topic: 10 Kw Homemade Battery powered snowblower
Replies: 8
Views: 273

Re: 10 Kw Homemade Battery powered snowblower

Yeah probably close to 450lb :lol:
by ENNOID
Feb 06 2019 1:46pm
Forum: E-Vehicles General Discussion
Topic: 10 Kw Homemade Battery powered snowblower
Replies: 8
Views: 273

10 Kw Homemade Battery powered snowblower

I built my own snowblower from recycled 6 x 12V = 72V lead acid battery pack approx. 500Wh each. The body of the snowblower contains 12 packs all connected in parallels for a total energy content of 6 kWh. The front auger is from an old gasoline powered snowblower that I adapted to fit on the new ba...
by ENNOID
Feb 06 2019 7:11am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Hi VietJr, LTC6813 or LTC6811 slave board have the same function. The user can pick the board that best fit his pack voltage. UPS is a small board that makes 12V @ 1 amp peak and can recharge battery (standard automotive 12V lead acid or 3S lithium cells). the battery is required to supply the peak ...
by ENNOID
Jan 27 2019 4:20pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

c10yas, If you have already a secondary power system in place, you can connect it to master directly and that is the reason why there is a connector for connecting external power on Master PCB. For example, electric car have normally an auxiliary 12v lead acid battery for delivering the power rush f...
by ENNOID
Jan 27 2019 7:43am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Peakon28, I admit, I haven't looked yet at every details from ltc6813 documentation, but it seems to be very similar to the original ltc6803 from diebiems. Ltc6811 is a good replacement for ltc6803 that I think would not require any coding at all. Before ordering any PCB, I think i will create anoth...
by ENNOID
Jan 26 2019 10:54am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Hi C10yas, Well I was not saying model does not have balancing. Obviously it has balancing but according to the pictures and the reviews from Munroe & associate, they seems to have very narrow tolerance on the cell voltage. On the PCB no external mosfet for balancing are visible, they seems to use m...
by ENNOID
Jan 26 2019 9:39am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Salut Haswell, I am not sure to understand what you mean by "force balancing"? The jumpers on the slave board have been put in place just for comparing internal vs external balancing. I guess external balancing has more advantage than disadvantages, but I wanted to test both options before creating ...
by ENNOID
Jan 17 2019 12:14pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

I spent some time on the design recently. I will send the gerber for fabrication soon I guess. I will wait for some feedbacks before doing so. Here is what happened: - Transfered DieBieMS schematics into kicad - Switched the balancing circuit to the LTC6813 IC instead of LTC6803 - Adapted the schema...
by ENNOID
Jan 09 2019 10:12am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

@c10yas: Quick observations I made yesterday after looking at your pack assembly: Is there any issue having the low pass filter (RES 100 & CAP 10nF that far away from the LTC6813? I think there might be some unwanted parasitics inductance generated by the long PCB traces in your design which will af...
by ENNOID
Jan 06 2019 10:38am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Thanks, I will have a look.

Meanwhile, I spent some time on the project last week. I think the schematics are ready and I will start soon with the PCB design. You can have a look to what I have done so far : https://github.com/EnnoidMe/ENNOID-BMS.

Thanks for your feedbacks
by ENNOID
Dec 16 2018 12:16pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

Hi, Thanks for sharing. I cloned the complete git repository and had a quick look on the project with altium and eagle this morning. one interesting thing I observed so far: -one of the two ltc6813 is used only for temperature monitoring. Maybe it was easier to implement it this way. On my side, I w...
by ENNOID
Jul 13 2018 1:28pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

So far, it seems that I am alone in this thread. I haven't put much effort so far in this project anyway. I now bring the fact that I just realized how the development board DC2350A-B and the related DC2026 control board developed by analog device seems to offer a good alternative for developing a p...
by ENNOID
Feb 24 2018 4:26pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

After a thorough inspection of this "FoxBMS", I do really see "german engineering" in this project... "system is over-engineered" :roll: The redundancy and safety is too much implemented in the hardware. I think their approach is just too expensive. (cells are monitored by two costly IC and two MCU ...
by ENNOID
Feb 23 2018 11:37am
Forum: Battery Technology
Topic: LTC6811 Implementation Thread
Replies: 130
Views: 11335

Re: LTC6811 Implementation Thread

... It is based on LTC6811
by ENNOID
Feb 23 2018 11:36am
Forum: Battery Technology
Topic: LTC6811 Implementation Thread
Replies: 130
Views: 11335

Re: LTC6811 Implementation Thread

Hi,

Just have a look on this project:
- www.foxbms.org

seems like the thing you were looking at...
by ENNOID
Feb 23 2018 11:35am
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

Re: BMS for 48V to 400V lithium-ion battery pack

After looking on the web I found those threads related to BMS: - https://endless-sphere.com/forums/viewtopic.php?f=14&t=63863 The part used has been discontinued... so that killed the project. Another user from previous thread listed above "methods" started a thread about the use of an up-to-date LT...
by ENNOID
Feb 23 2018 10:09am
Forum: Battery Technology
Topic: OSBMS - A scalable, low cost, and full featured BMS
Replies: 56
Views: 17148

Re: OSBMS - A scalable, low cost, and full featured BMS

The ATA6870N seems to be discontinued...
by ENNOID
Feb 20 2018 8:22pm
Forum: Battery Technology
Topic: BMS for 48V to 400V lithium-ion battery pack
Replies: 25
Views: 3277

BMS for 48V to 400V lithium-ion battery pack

Hi, I'm looking for an open source BMS (Battery Management System) which would allow me to develop my own electric vehicle lithium-ion battery pack for voltages range from 48V and up to 400V. The problem I am encountering right now is the lack of any medium voltage open source BMS with advanced func...
by ENNOID
Jan 29 2018 12:04pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 16619

Re: OSHW TO247 IGBT watercooled laminated half-bridge

sorry I wrote that of a really unclear and false way: you use a voltage divider between the two emitter connections and the gate to limit this voltage to an acceptable value for limiting Vce and Vg Let's start over : During fast turn off at high current, you use the voltage created between the two d...
by ENNOID
Jan 29 2018 9:43am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 144
Views: 16619

Re: OSHW TO247 IGBT watercooled laminated half-bridge

maybe what you wrote was unclear to me...


if you mean that the small circuit connected to the resistor divider and gate driver would add unwanted parasitic inductance or antenna lossses to the gate circuit...that would be incredibly small i think if you take care of the circuit.