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  #1  
Old 01-07-2017, 11:18 AM
satchid satchid is offline
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Default 48V 100AH battery pack

HI,
My first post here.

I have a question for you.
I have a Biro Estrima 4 wheel car with 2 * 2 Kwatt 48volt motors in the rear wheels. It is equiped with lead accid batterys right now but they are loosing slowly cpasity. Max range at the moment is only 25Km.
This car runs at up to max 80A in normal driving and in boost mode max 110A for 11 seconds.
I want to convert to LFP battery's and i found the folowing;
https://optimum-china.en.alibaba.com..._battery_.html

This battery fits exactly in the existing battery compartment, it is the right size and is the right cappasity that i want.
Could anybody coment on this company? and,
Could anybody coment on this battery?
Thank You,
Willy
Belgium.
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  #2  
Old 01-07-2017, 12:09 PM
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major major is offline
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Default Re: 48V 100AH battery pack

Hi Willy,

It says Lithion ion which is probably different than LFP. I see no mention of BMS or charger or specs liike C rate. Price seems high. No shipping cost. Not enough info. China is a crap shoot. Customer support and return/refund mostly don't happen.

major
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  #3  
Old 01-08-2017, 02:40 AM
satchid satchid is offline
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Default Re: 48V 100AH battery pack

Thanks,
So what are my options?
The nominal voltage of this EV is 48v driven with 4 led/acid battery's max voltage in cabin on dashboard 52.9v minimum is 46.2v.
Maximum normal driving current is 80A
boost current is 110A for max 11 seconds
I would like 100AH battery(s)
max sizes of compartment:
84 cm (33") long
21cm (8.26")wide (absolute max is 220cm)
40 cm (15.7") high

In this I would like a new charger max 220 volt 20amp on the primary side and battery controls if necessary.
I drove 5000km in 8 months.

Fast charging could be favorable.

Could somebody set me on the way with this.

Thank you,
Willy
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  #4  
Old 01-08-2017, 12:18 PM
nucleus nucleus is offline
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Default Re: 48V 100AH battery pack

You could do a string of 15 CALB LiFePO4 cells to be at 48 Volts nominal.

15 100 Ah CALB cells will fit on your box nicely.

You will very happy with how it drives compared to Lead cells, with the reduced weight and increased power.
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  #5  
Old 01-08-2017, 01:21 PM
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Yabert Yabert is offline
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Default Re: 48V 100AH battery pack

Quote:
Originally Posted by satchid View Post
Could somebody set me on the way with this
Take a look at this: http://hybridautocenter.com/HAC4/ind...cks&Itemid=195
They are Nissan Leaf and chevy Volt battery. High quality battery.
For comparaison, a chevy Volt 48v 94Ah battery will fit your needs and cost only 1235$
You can buy some kit like this or build your own if you can find Leaf or A Volt battery at a scrapyard near you.
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My Smart Fortwo high power! 57 000+ EV Km. Impulse 9, Soliton 1, chevy Volt battery
http://www.diyelectriccar.com/forums...ion-51472.html
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  #6  
Old 01-09-2017, 05:49 AM
Fir3Storm Fir3Storm is offline
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Default Re: 48V 100AH battery pack

I can custom fit a box with a dual pair of Tesla Lithium packs for your desired dimensions.

2x Tesla Battery module @ 444 18650 with individual cell fusing
BMS Board 12S Li Ion with 150A max current, 125A Fuse.
Battery operating range will be 50,4V - 34,8V yielding 9,5kWh or 214Ah.
Safe operation would be 48V-38V yielding 8kWh useable energy.

Dimensions are 685x320x85 pr module, stacking two in series with some wooden enclosure would match perfectly. But you would loose some Voltage, depends on your motor / controller setup if it can handle it.

- Fir3Storm

Last edited by Fir3Storm; 01-09-2017 at 05:53 AM.
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  #7  
Old 01-09-2017, 08:19 AM
satchid satchid is offline
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Default Re: 48V 100AH battery pack

Fir3Storm et All,
I am not so keen on lower operating voltage, I am running now on 52.9V starting and ending on 46.2V I do not know how to change that in the program of the car. I think that a small diference between 48v to 46.2v would limit mi range significantly.

The verhicle is an "Estrima Biro" of 2015.
Thank
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Old 01-09-2017, 08:38 AM
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akseminole akseminole is offline
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Default Re: 48V 100AH battery pack

The voltage would not be your limiting factor for range.
Lower voltage May reduce your top speed(but I am not certain by how much in an already only 48v nominal system).

The difference here is that your 48v 100ah lead acid pack would give you 50ah range if you were driving it to maintain your battery cycle life. I suspect that you are not, so say that you are using 80% of your battery and cycle life be damned, then you have potentially a 48v 80ah range.

Your range would actually be less than this due to peukerts problems, but I don't know enough about that to accurately describe it to you. Suffice to say that the more power that you demand from your lead acid batteries, the less they will give you.

In theory, those Tesla battery packs in series would give you a 48v 250ah battery. Using only 80% would allow you to have 200ah of range with few peukerts issues.

So, the issue at hand is not that you would have less range due to lower voltage, if your motor controller is able to deal with the lower voltage (it may have some preset lower voltage limitations that would kick in to save you from driving your lead acid pack into the ground).

If your controller can operate at a lower voltage, you would have over double your current range with the Tesla pack vs your "higher voltage" lead acid pack.
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Old 01-09-2017, 08:52 AM
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akseminole akseminole is offline
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Default Re: 48V 100AH battery pack

Having looked at it, that thing is Super Cute! It's like a miniature street legal golf cart!

As you say that you have a lead acid pack, I presume that you have a previous version of the Biro? In the specs, all they have are Lithium packs at 44v nominal.

Which leads me to believe that unless there is a major difference between your Biro and the most current model, your Biro would probably be able to operate on the Tesla Lithium pack.

http://www.estrima.com/wp-content/up...G_download.pdf
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Old 01-09-2017, 09:42 AM
Fir3Storm Fir3Storm is offline
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Default Re: 48V 100AH battery pack

i tend to agree with akseminole on that point.

The Biro Lithium Maxi battery is €3000.
A 44.4 (12series Lithium Ion) with 100AH capacity.

My offer is double the capacity at much lower cost.
So running close to 200km is possible.

You would need to get a suitable charger, as the Lead acid charger is running to high voltage. Since this is DIY you would need some in depth knowledge too since no support is given. And i cant answer whether your Biro can handle Lithium, allthough most likely it can or be made to.

- Fir3Storm
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