wow well how many wood i need/ 3.2V 20Ah LiFePO4 (Lithium Iron Phosphate) Rechargeable Battery/ 10 - 20 lol

really i want it all lol i want to do 70 clicks and 35 mph and speed up like a top fuel car hehehe

hi guys how can i build a good Battery Pack to fit my case. how big can i go , and how it works
www.all-battery.com -can this give me a idea what i need?

Wayne... Ya posted this as a "MeetUp Idea" and in the wacky MeetUp World I'm not sure how to respond... So here:

BACK IT UP BUDDY...

Watt do you mean by "good"?

Lets assume "safe"? ...but also "best bang for the buck"?

Bottom Line ya need to know about storing the energy you need to generate the power you need to travel X miles at Y speeds (say Wh/kms)... I'm tapping about yer "battery pack".

...where "Wh" = V x Ah

V?... Ah?... Sound familiar? eg four 12V 20Ah batteries hooked up in series to give you 48V so 960Wh BUT how many Wh/kms???

It's really Wh/km that are the key. Not V. Not A. Not km... But a mix of the three, which is a bit of a "dance" :)

Ya have to start by identifying your desired range. Plus Wh/km
Lock

can i use 4x 12v 17 ah rather then the 4x20ah

Lifepo4 I know but am not up on Li-Polymer

Lifepo4 should give a range of 1.3 miles per amp hour, so a 10Ah = 13 miles but if you want to achieve a long life from the battery you should not go below 80% DOD, so a 10Ah battery should not go beyond 8Ah or 8 X 1.3 Miles = 10.4 Miles.

Might seem low (distance wise) but SLA at 20Ah cannot go below 10Ah without damage to the battery.

Ken should know about this (I don't have a clue about e-scooters) but if the e-scooter gets regeneration via soft braking, then that Regen will extend the distance by 10 to 15% or 1.0 to 1.5 miles added.

Point is a 10Ah Lifepo4 should give the same distance as a 20Ah SLA.

Lifepo4 ain't cheap but it does cost less than SLA when based upon Life Cycles.

Your typical 48V X 20Ah SLA pack will give you 200 Cycles for $300.00

LifeBATT Lifepo4 48V X 20Ah pack will give you 1,500 Cycles for $1,300.00

So Multiply SLA $300.00 X 7.5 times and you'd pay $2,250.00 to match the LifeBATT LiFepo4 pack at $950.00 Less cost.

Plus a 20Ah Lifepo4 pack should give you 22-> 24 miles per charge.

can i use 4x 12v 17 ah rather then the 4x20ah

Hi Gary... Yes, you can, except you can expect shorter range on a charge... about 15% less range... You may also be drawing the pack down to higher depths of discharge on average trips, and this will only serve to shorten the life of the pack in terms of how many cycles (one charge plus one discharge) you get before the pack gets too "tired" and ya need to replace it. So going from 20Ah to 17Ah might save you a few bux up front (and make for a slightly lighter pack/bike) but it'll probably *increase* your cost per km for batteries...

If ya have the room for 20Ahs... probably ya should stick with this size! Why the interest in smaller batts?
Lock

wow well how many wood i need/ 3.2V 20Ah LiFePO4 (Lithium Iron Phosphate) Rechargeable Battery/ 10 - 20 lol

And I say again:

Ya have to start by identifying your desired range. Plus Wh/km
Lock

...Wh/km... Ya can figure this out pretty easily based on your existing pack. I'll guess that your controller senses how much charge is remaining in the pack based on voltage (an imprecise measure, but in common use) and cuts power when the batts are down to 20% remaining. So if you have for example a 48V pack as four 12V 17Ah batts that'd be 48V times 17Ah = 816Wh. Times 80% gets you 652Wh.

And watt sort of range are you getting these daze from this 652Wh before the controller cuts power?

Say... 30km?? If it were 30km that'd be 652/30 = about 22Wh per km...

Then ya just need to decide how much range you want on one charge. If ya want 50km then that'd be 1100Wh... If ya stay with a 48V pack, that'd be 1100Wh/48V = about 23Ah.

Lock

Lifepo4 ain't cheap but it does cost less than SLA when based upon Life Cycles.
Your typical 48V X 20Ah SLA pack will give you 200 Cycles for $300.00
LifeBATT Lifepo4 48V X 20Ah pack will give you 1,500 Cycles for $1,300.00
So Multiply SLA $300.00 X 7.5 times and you'd pay $2,250.00 to match the LifeBATT LiFepo4 pack at $950.00 Less cost.
Plus a 20Ah Lifepo4 pack should give you 22-> 24 miles per charge.

One caveat maybe... Lottsa rumours about Lithium chemistries having a calendar life... Maybe only five years... 1500 cycles, or even only 1000 is an amazing amount of life, if you figure on maybe only 200 cycles a year??? (Most folks in Toronto will NOT be riding their ebikes through the coldest and snowiest daze of the year!)

So 1000 cycles or 1500 cycles at 200 per year works out to five or 7.5 YEARS of life... IF the cells last this long. It may be more conservative for comparative costing to "saw things off" for lithium at only five years of useful life (if stories about calendar life are true...)

But EVen at five years of useful life, if the pack and charger costs $1500 to buy, so amortizes at $300 a year, watt is that? Equivalent to three months of public transit passes? Not hard for the ebike (investment in a Lithium pack) to be a net saver when it can chop into transit costs like this...

Lock

really i want it all lol i want to do 70 clicks and 35 mph and speed up like a top fuel car hehehe

Well then start saving yer pennies for something like a Brammo:


$7995US plus shipping and taxes... And ya need the operator license and the vehicle license and the insurance... I think it's pretty cool that ya can walk into a BEST BUY in California and Oregon right now and pick up one of these like you were buying a battery electric power tool... (which you are, in a way)

Incidently, the Brammos come with a 76.8V 3.1 kWh pack of Valence LiFePO4 which is pretty "cadillac" stuff for batteries... They claim good for 2000 cycles, and claim an "average" range of 68km. Top speed 95+ kph.

Lock

really i want it all lol i want to do 70 clicks and 35 mph and speed up like a top fuel car hehehe

Well then start saving yer pennies for something like a Brammo:


$7995US plus shipping and taxes... And ya need the operator license and the vehicle license and the insurance... I think it's pretty cool that ya can walk into a BEST BUY in California and Oregon right now and pick up one of these like you were buying a battery electric power tool... (which you are, in a way)

Incidently, the Brammos come with a 76.8V 3.1 kWh pack of Valence LiFePO4 which is pretty "cadillac" stuff for batteries... They claim good for 2000 cycles, and claim an "average" range of 68km. Top speed 95+ kph.

Lock

that way faster than i want to go hehehe oh can you co sign a loan lol

No Pedals on the Brammo and therefore Not street Legal as an E-Bike in Ontario.

You can have 100 mph E-Bike in Ontario and still be Legal if it has Pedals but it has to be used for "Off Road" use only to get around the 500W X 20 mph rule. You will of course be in deep trouble if caught doing 100 mph on a public road (even if you are pedaling). There are thousands of miles of roads in Ontario seldom travelled by the Police i.e. NW Ontario.