building 1.3kwh battery pack with 18650

F

franccis

100 µW
Joined
Dec 4, 2015
Messages
9
hi, my goal in to build a 1.3kwh 120v power pack out of 168 18650 cells in 14s12p configuration
I allready have the 168cells. i need your help to find the materials i need because i cant be everywhere on the net :lol:

first, the bms, i need a 14s 51.8v bms that can handle 30/40amp i found this one
http://e-greenmotion.com/index.php?route=product/product&product_id=99
but maybe there is a other one?

2: the inverter, i need a 48vdc to 120vac 1000w pure sine wave. i found this one
http://www.ebay.com/itm/Mean-Well-TS-700-148A-DC-to-AC-Inverter-48VDC-100VAC-110VAC-115VAC-120VAC-700W-/121814600832?hash=item1c5cb74c80:g:aGwAAOSwNSxVezFR
but maybe there is a other one?

3:the charger, i need a 51.8v charger for li-ion battery. minimum 3a. maximum 10a. thats the one i found
http://e-greenmotion.com/index.php?route=product/product&path=65_71&product_id=200


4: i want every cells to be quickly removable because i want to be able to replace 1 cell without desoldering. thats why all my cells will be on holders like this
https://www.fasttech.com/products/1009/10003906/1279304
the holder need to have 24awg wire or bigger

5: the fuses, i think 2.5a would be good
http://ca.mouser.com/Search/ProductDetail.aspx?R=021602.5MRET1SPPvirtualkey57610000virtualkey576-021602.5MRET1SPP

maybe someone knows better options then my links
the cost goal is 1000$cad or less without the 18650 batterys because a can have them for nearly free
 
do you have a link?
the battery pack have to weight 30lbs or less because i will move it nearly every day
 
He is right. You are waaaaaaay in over your head- just buy one. What is the 120V reference about in the first line?!
 
120v a/c

and if there is a 1.3kwh or more batterypack with 120v a/c inverter that weight 30lbs or less and cost 1000$cad or less that would be interesting

but my goal is to find better deals for the items I listed in my first post
 
franccis said:
hi, my goal in to build a 1.3kwh 120v power pack out of 168 18650 cells in 14s12p configuration
I allready have the 168cells. i need your help to find the materials i need because i cant be everywhere on the net :lol:

first, the bms, i need a 14s 51.8v bms that can handle 30/40amp i found this one
http://e-greenmotion.com/index.php?route=product/product&product_id=99
but maybe there is a other one?

2: the inverter, i need a 48vdc to 120vac 1000w pure sine wave. i found this one
http://www.ebay.com/itm/Mean-Well-TS-1000-148A-DC-to-AC-Inverter-48VDC-100VAC-110VAC-115VAC-120VAC-1000W-/121808457209?hash=item1c5c598df9:g:jp8AAOSwBahVdKls
but maybe there is a other one?

3:the charger, i need a 51.8v charger for li-ion battery. minimum 3a. maximum 10a. thats the one i found
http://www.batteryspace.com/smartcharger30afor518vli-ionpolymerrechargeablebatterypack.aspx
i cant find a more then 3amp charger

4: i want every cells to be quickly removable because i want to be able to replace 1 cell without desoldering. thats why all my cells will be on holders like this
https://www.fasttech.com/products/1009/10003906/1279304
the holder need to have 24awg wire or bigger

5: the fuses, i think 2.5a would be good
http://ca.mouser.com/Search/ProductDetail.aspx?R=021602.5MRET1SPPvirtualkey57610000virtualkey576-021602.5MRET1SPP

maybe someone knows better options then my links
the cost goal is 1000$cad or less without the 18650 batterys because a can have them for nearly free
Click to expand...

What is the inverter for?
Make sure whatever charger you get is set to 58.8v, not 51.8v.
Those cell holders are not going to cut it. They will not support the current required.
Tell us more about the build.
 
the charger is for 51.8v li ion battery packs but charge at 58.8v
the inverter is for converting dc to ac
the main purpose of my battery pack will be for camping thats why it need to be light weight
the cell holder have 2 24awg wire for each cells and 24awg =2amp max. lets do math :D i have 168 battery giving 2amp = 336amp*3.7v= 1243watt. the inverter would be rated for 1000w so i will never need 2amp per cell. and i will have 2.5a fuses
 
When camping what do you need to power ? As there many ways for your end result.
Maybe an electric water pump for your hidden crop ? Moon shine ? Or ?
 
we are getting off topic i just need to know if there are better options then the links in my first post
 
It's not really off-topic; without knowing what the job is (i.e., the kind of loads things will see), we can't tell you for sure if there are better things for the job. I see that you have some specs that need to be met in the list in the OP, and similarly in a later post, but some of it doesn't have enough info.

For instance, you mention fuses, but you dont' say what they are supposed to protect, so we can't know whether "2.5a" is right, or if the one you want is good for your purpose.

For the inverter, we can't know if one is better than another for your purpose without knowing what that purpose is, because there are some things that some inverters simply won't work for, or not for long before smoking, etc., even though they are "powerful enough" to do it, just looking at watts and/or current. Some loads may even be damaged by some kinds of inverters.

Some things are confusing, too, like you say that you "can have" your batteries for nearly free, but you say you "allready have" them earlier in the post.

Stuff like that.

But knowing exactly what your end purpose is would probably help people figure out what you need, or if what you selected might be best already.


But I would guess most viewers and posters are just curious, and will be even moreso since you apparently don't want to talk about it. ;)
 
I will not waste any more time on trying to help you if you will not provide the information necessary to help. Good luck with whatever it is you are trying to do.
 
amberwolf said:
It's not really off-topic; without knowing what the job is (i.e., the kind of loads things will see), we can't tell you for sure if there are better things for the job. I see that you have some specs that need to be met in the list in the OP, and similarly in a later post, but some of it doesn't have enough info.
the load will never exeed 600w

For instance, you mention fuses, but you dont' say what they are supposed to protect, so we can't know whether "2.5a" is right, or if the one you want is good for your purpose.the fuses will protect the batteries and the wire

For the inverter, we can't know if one is better than another for your purpose without knowing what that purpose is, because there are some things that some inverters simply won't work for, or not for long before smoking, etc., even though they are "powerful enough" to do it, just looking at watts and/or current. Some loads may even be damaged by some kinds of inverters.

Some things are confusing, too, like you say that you "can have" your batteries for nearly free, but you say you "allready have" them earlier in the post.
i allready have the 168 18650 batteries i need but i can get more battery to replace the ones that will fail and thats why they will be in holders and not soldered

Stuff like that.

But knowing exactly what your end purpose is would probably help people figure out what you need, or if what you selected might be best already.
my end purpose is to have a lightweight battery pack made out of 168 18650battery that convert 51.8vdc to 120vac for less then 1000$


But I would guess most viewers and posters are just curious, and will be even moreso since you apparently don't want to talk about it. ;)
Click to expand...
i am happy to answer the questions about the details of my project like you did but I have said everything about the reasons i have to do this project
 
You put your information wrong. This is how it had to be:
You need a 51.8V 1.3kWh battery that could supply 600W of power and 1kW 120VAC inverter to power motor home.

First, you don't need those holders, they are crap. Spotweld your cells into 12P groups, then you only need to take apart that group and replace it and if the pack is build right with good cells it is very unlikely you will need to.

You don't need those fuses, use one on the whole pack.
The 18650 usually weighs at 45g so the whole pack should be at 17lb+some wiring.
Your cells has to be around 1800mAh to meet you capacity.
 
If you explain your actual needs ...
You might be able to accomplish your project much cheaper-simpler!

Examples:
1. 168 cells - 28s6p (@ 4.2V = 117.6V) 120V DC works just fine with many types of 120V AC devices ... heaters, lighting, some electronics, many motor types etc.
120V AC though a bridge rectifier and a regulation circuit can charge a 120V DC battery very quickly.

2. 168 cells - 3s56p (@ 4.2V = 12.6V) 12V battery is much simpler with a large variety of of available devices
12V:
lighting incandescent, halogen, fluorescent and LED lighting ... including grow lights
water pumps
heating elements
motors
radios
amplifiers
etc. etc. etc.
 
agniusm said:
You put your information wrong. This is how it had to be: maybe its because i am from montreal,QC and english is not my first language
You need a 51.8V 1.3kWh battery that could supply 600W of power and 1kW 120VAC inverter to power motor home.

First, you don't need those holders, they are crap. Spotweld your cells into 12P groups, then you only need to take apart that group and replace it and if the pack is build right with good cells it is very unlikely you will need to. i dont have a spot welder and all my 18650 come from labtopbattery and even if I retain only the best ones, some of them have only a few cycles left and i need to replace them quickly

You don't need those fuses, use one on the whole pack. what if one cell fail and become short i think it need a fuse to prevent the other cell to discharge in that cell
The 18650 usually weighs at 45g so the whole pack should be at 17lb+some wiring.
Your cells has to be around 1800mAh to meet you capacity.
Click to expand...
the avg amphour of my 168cells is 2200.4mah and the avg remaning capacity from new is 87%
 
DrkAngel said:
If you explain your actual needs ...
You might be able to accomplish your project much cheaper-simpler!

Examples:
1. 168 cells - 28s6p (@ 4.2V = 117.6V) 120V DC works just fine with many types of 120V AC devices ... heaters, lighting, some electronics, many motor types etc.
120V AC though a bridge rectifier and a regulation circuit can charge a 120V DC battery very quickly.your right but when the cells are at 3.5v the pack will be a 98v and its not enough

the reasons i want to have a 48vdc to 120vac inverter is because: first, i could have a 12vdc to 120vac but that would require a 80amp 14.8v bms and big wires. second, i cant find a 96vdc to 120vac inverter or a 103.6v bms. thats why I chose a 48vdc to120vac inverter with a 51.8v bms. the inverter can take 42vdc to 60vdc and a 14s 18650pack varies from 42v(empty) to 58.8v (full) so thats perfect

2. 168 cells - 3s56p (@ 4.2V = 12.6V) 12V battery is much simpler with a large variety of of available devices
12V:
lighting incandescent, halogen, fluorescent and LED lighting ... including grow lights
water pumps
heating elements
motors
radios
amplifiers
etc. etc. etc.
Click to expand...
i allready have all the equipement i need to power and they work on 120vac and i wont buy new 12vdc equipement that does the same job
 
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