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Discussion Starter · #1 ·
Hello All,

I am currently looking to purchase a battery, BMS and charger for my conversion project and am considering using EIG C020 cells. I would be interested in people’s opinions, advice and experience from their own builds, particularly with these cells.

I require 120V nominal voltage, 500A peak current, and a minimum of 16kWh of energy. Each cell is 3.6V nominal (4.2V max, 3.0V min) and 20Ah capacity (see .pdf for more cell specs).

A 34s7p pack (238 cells, 122V nominal, 143V peak, 140Ah, 17kWh) works out to be a suitable configuration, and would be achieved with bus bars like shown in the attached image (image taken from JimBob’s advert, a seller of the cells in the UK). The cells would be physically mounted using threaded bar through their corners.
120101


Does anyone have advice on a suitable BMS set-up for the battery? I imagine an Orion BMS 2 would be up to the job (?) but what other options could be suitable?

How would people recommend I manage temperature of the cells? I plan on just using passive cooling, is this fine?
I am not looking for “fast” charging, is there a charger that anyone would recommend?

My budget is limited, so any advice on how I can minimise cost is greatly appreciated. I am open to suggestions of alternative cell/module/battery options and am located in the UK.

Many thanks for your time reading this post,
Tom
 

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just an quick question, are EIG still in business? I haven't seen their batteries for a long time. You may want to reconsider using those cells if warranty/support is top priority for you.

The usual BMSes are either Orion or Elithion, depending on your battery configuration. In general, Elithion will be for longer strings of pack (i.e. higher voltage), while Orion will be for less series packs. (of course, it really depends a lot on personal requirements)

For your case, Orion seems to be a good option. How does it look for your budget?


Regarding cooling, not just "fast charging", normal driving usage may require some form of active cooling. you said this is for a conversion project; what application will this be for? normal driving? highway driving? a bit of track use? a lot of track use? how powerful is the motor you plan to use?

Answering these questions above will get the answer on how much cooling you need.
 

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Discussion Starter · #3 ·
just an quick question, are EIG still in business? I haven't seen their batteries for a long time. You may want to reconsider using those cells if warranty/support is top priority for you.

The usual BMSes are either Orion or Elithion, depending on your battery configuration. In general, Elithion will be for longer strings of pack (i.e. higher voltage), while Orion will be for less series packs. (of course, it really depends a lot on personal requirements)

For your case, Orion seems to be a good option. How does it look for your budget?


Regarding cooling, not just "fast charging", normal driving usage may require some form of active cooling. you said this is for a conversion project; what application will this be for? normal driving? highway driving? a bit of track use? a lot of track use? how powerful is the motor you plan to use?

Answering these questions above will get the answer on how much cooling you need.
Hi,

Thank you for your reply.

I think they are out of business - there are a handful of private sellers selling new cells (from liquidation?) at good £/kWh which is why I am interested in them in particular. You are correct, warranty/support will be unavailable.

The Orion certainly does seem suitable, especially as my pack would be around 34s. I will look into the Elithion more, thank you. I am looking to save money where I can, but the Orion seems like it might be the most cost effective option.

The project is converting a Triumph Dolomite (small/medium British saloon car) whose kerb weight will be approx 1000kg. I plan on using it for "normal driving" around town and sometimes on motorways, but not racing. I am using a forklift motor with a controller capable of peak 500A at 120V. I am unsure of what my average current/power consumption will be.
 
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