A newbie's question about battery technology in a 2kw scooter: What is the lightest available?

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Falmer
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Joined: 12/05/2008
Points: 3

Hi,

This is my first post here. I hope I won't be asking that 'same exact question you've seen ask hundreds of time by a newbie'.
Please correct me if any of my assumptions are wrong.

To ride an electric scooter (not a standup scooter) in an urban environment with a similar 'experience' to that of a 50cc gas scooter, you would need a model with an engine of about 2000w.
If it was to have an autonomy of 40-50km on flat terrain, and needed the lightest batteries available, what type of battery would you recommend? What would be their expected weight?

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jdh2550_1
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Joined: 07/17/2007
Points: 2338
Re: A newbie's question about battery technology in a 2kw ...

To get an experience similar to a 50cc moped you'd need around 60V (as evidenced by the XM-2000 / XM-3000 / Z-20 / Zapino etc.)

To get a range of around 40 - 50 km (25 to 30 miles) I'd guesstimate you'd need around 30Ah (I can't find my post where I tracked the energy used on the XM-2000).

The best battery to use is LiFePO4.

Thundersky do a 20Ah (weighs 0.75kg / 1.65lbs) and a 40Ah version (weighs 1.6kg / 3.5lbs).

Nominal voltage is 3.2V so you'd need 19 (for a pack voltage of 60.8V) or 20 (for a 64V pack).

19x20Ah would weigh 14.25kg
20x20Ah would weigh 15kg
19x40Ah would weigh 30.4kg
20x40Ah would weigh = 32kg

Hope this helps.

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antiscab
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Joined: 07/07/2007
Points: 1598
Re: A newbie's question about battery technology in a 2kw ...

to get 40km you need 30AH usable at 60v (20 cells)
for TS cells, that means 40AH cells.

by 50cc performance, are you refering to top speed or acceleration?
60v on a emax will get you 65kmh really reliably and 70kmh in good conditions.
increasing the current limit to 125A will give you acceleration well above that of a 50cc scooter, at speeds below 50kmh.

if you are after a top speed similar to that of a unrestricteed moped 50cc moped, then you would be better off looking at the 3000w+ scooters.
based on reports of others, these can do 80kmh, which is around the reliable top speed of a 50cc moped.

Matt

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2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst replacement TC Charger
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Spent so far: $5800 + $7000 + $1720 + $960 + $320 + $720 + $140 + $600
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Falmer
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Joined: 12/05/2008
Points: 3
Re: A newbie's question about battery technology in a 2kw ...

Thank you for your precise and detailed answer guys!!
I am doing the evaluation of a larger project about commuting in an urban environment.

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