What battery should I get for a 5000w motor? - Ebikes Forum

Diego Rodriguez

New member

Local time

2:59 PM

Joined

Sep 23,

Messages

3

Location

Spain

• Sep 23,

• #1

I wanna buy a w kit but it doesnt come with a battery, therefore I was wandering what kind of battery would be suitable for such a setup

HumanPerson

Oooohhhhmmmmm

Local time

9:59 AM

Joined

Jan 21,

Messages

4,805

HumanPerson

Oooohhhhmmmmm

Local time

9:59 AM

Joined

Jan 21,

Messages

4,805

• Sep 23,

• #3

I wanna buy a w kit but it doesnt come with a battery, therefore I was wandering what kind of battery would be suitable for such a setup

Welcome to the forums, by the way!

Atavar

Well-known member

Local time

8:59 AM

Joined

Apr 21,

Messages

575

Location

Minnesota

• Sep 23,

• #5

A great effing big one. w is 7hp. You’re going to need beefy wheels forks and dropouts too.

Diego Rodriguez

New member

Local time

2:59 PM

Joined

Sep 23,

Messages

3

Location

Spain

Diego Rodriguez

New member

Local time

2:59 PM

Joined

Sep 23,

Messages

3

Location

Spain

• Sep 23,

• #7

A great effing big one. w is 7hp. You’re going to need beefy wheels forks and dropouts too.

a guy told me that i would need at least 25Ah and 80amps current, also if the motor says 72V ill need a battery with that voltage right? (im new to this)

Atavar

Well-known member

Local time

8:59 AM

Joined

Apr 21,

Messages

575

Location

Minnesota

• Sep 23,

• #8

Ask the people selling the kit to recommend a battery.
A watt hub motor is going to tear up spoked bicycle wheels and dropouts.
If this is a mid mount motor it will destroy a bicycle chain and sprockets.
80 amps will drain a brand new fully charged 40ah battery in less than a half hour.
Bicycles are designed for human power. A trained and fit professional cyclist can generate 300-400 watts of power. When you put more than ten times that to the machine stuff’s gonna break.
Think of all the problems Tim Allen had every time he said “More power!”
Having said that, you be you. Let us know how it works out.

m@Robertson

In Memoriam -

Local time

6:59 AM

Joined

Jan 13,

Messages

1,429

Location

The left coast

• Sep 23,

• #9

If you are this green to the subject, consider NOT going to the hardest of the hardcore power levels for your first experience. Its pretty clear you don't know what you are getting into on multiple fronts. Battery amperage, voltage, bicycle frame and wheel construction...

We all have to start somewhere so I'm not being negative here. But you are clearly in WAY over your head and asking questions of people who aren't is not going to be enough to save your investment in equipment.

slitespd

New member

Local time

6:59 AM

Joined

Mar 18,

Messages

15

Location

Wickenburg, AZ

• Sep 30,

• #10

I wanna buy a w kit but it doesnt come with a battery, therefore I was wandering what kind of battery would be suitable for such

If you are this green to the subject, consider NOT going to the hardest of the hardcore power levels for your first experience. Its pretty clear you don't know what you are getting into on multiple fronts. Battery amperage, voltage, bicycle frame and wheel construction...

We all have to start somewhere so I'm not being negative here. But you are clearly in WAY over your head and asking questions of people who aren't is not going to be enough to save your investment in equipment.

I just measured the voltage on CR today . Imagine that!!

Cybersnow

Member

Local time

6:59 AM

Joined

Mar 24,

Messages

36

Location

Idaho

• Sep 30,

• #11

I would not start with the 72 volt battery as there have been some documented fires that happened during charging. I am also building the same set up and decided to go with a pair of 52v batteries. Can still get with two in parallel or using a single. I would advise you look at a used downhill bike as theybseem to be a lot tougher. Also there is a company building a supervstrong set of gears and derailleurs.

topstone

New member

Local time

2:59 PM

Joined

May 5,

Messages

20

Location

uk

• Sep 30,

• #12

I would get 'a really big one' Ha ha

neutron

Active member

Local time

9:59 AM

Joined

Dec 6,

Messages

218

Cybersnow

Member

Local time

6:59 AM

Joined

Mar 24,

Messages

36

Location

Idaho

• Sep 30,

• #14

I think the person was talking about a non bafang kit that advertises a 5k watt motor.

m@Robertson

In Memoriam -

Local time

6:59 AM

Joined

Jan 13,

Messages

1,429

Location

The left coast

• Sep 30,

• #15

Yeah something like a QSMotor direct drive is where you'd be going for something like this. But even with a QSMotor, you still are probably looking at the really bigass one to get it to happily take 5kw.

Small - Bafang G060 (up to 1.5-2kw. ish)


Medium - QS205 (3kw-ish)

Ridiculous - QS273. 5kw and up

Cybersnow

Member

Local time

6:59 AM

Joined

Mar 24,

Messages

36

Location

Idaho

• Sep 30,

• #16

Actually I am looking at a CYC motor kit to replace the current Bafang kit on my hardtail MTB. If I can find a decent priced used downhill bike, I will donate the hardtail with the E bike kit.

m@Robertson

In Memoriam -

Local time

6:59 AM

Joined

Jan 13,

Messages

1,429

Location

The left coast

• Sep 30,

• #17

I've got an X1 Pro that reaches 4 kw with a custom BAC800 controller. Its not something I would do again. Hearing that motor shrieking and watching that cart chain spinning so fast its traveling back in time... I haven't lost an ankle yet but I do worry about what happens if something lets go.

Cybersnow

Member

Local time

6:59 AM

Joined

Mar 24,

Messages

36

Location

Idaho

• Oct 1,

• #18

That is really good to know!! The last thing I need is to have a loud bike and be afraid of that short chain shredding. I currently have a BBSHD on a Salsa Fargo frame. I want just a tad more power climbing some of the steep fire trails. If I go with a rear wheel motor, then I need to replace more parts. Is there a reasonably quite mid motor kit that does better than watts peak if CYC isn't a good choice?

HumanPerson

Oooohhhhmmmmm

Local time

9:59 AM

Joined

Jan 21,

Messages

4,805

• Oct 1,

• #19

I'd think this would get you over w prolly over peak in your BBSHD


https://lunacycle.com/blog/luna-bbshd-ludicrous-v2-released/

Hello all,

I have been using this site to educate myself and "select" a brand to use as entry level to ebikes. I was leaning towards Ride1Up and still really like their value and offerings but I saw this kid in South Carolina built a stealth bomber bike and thought that would be a nice project for me. After researching it I discovered I could get an entire bike as cheap or cheaper and would have less work to do before riding it so I found one on Alibaba and had a very pleasant experience working with them and getting one shipped to the US. It was usd and I feel like very worth it. Crazy fun. Very powerful. I also bought a cheap boost bike from Bikes direct to get exercise but also plan on buying a LunaCycle mid drive kit for that eventually.

Advice to anyone looking at EBikes. Pull the trigger. Get in and start learning. I've learned more owning one than I could have researching. I had to change a flat on the rear tire the first week and had to get all up in the Stealth bike. It was unpleasant as there was no quick disconnect but I managed and learned a thing or two about the bike.

The Lunacycle kit I learned about from a guy with a channel called "HoboTech". He made himself a nice mid drive bike from the same boost bike I bought.

Hello all,

I have been using this site to educate myself and "select" a brand to use as entry level to ebikes. I was leaning towards Ride1Up and still really like their value and offerings but I saw this kid in South Carolina built a stealth bomber bike and thought that would be a nice project for me. After researching it I discovered I could get an entire bike as cheap or cheaper and would have less work to do before riding it so I found one on Alibaba and had a very pleasant experience working with them and getting one shipped to the US. It was usd and I feel like very worth it. Crazy fun. Very powerful. I also bought a cheap boost bike from Bikes direct to get exercise but also plan on buying a LunaCycle mid drive kit for that eventually.

Advice to anyone looking at EBikes. Pull the trigger. Get in and start learning. I've learned more owning one than I could have researching. I had to change a flat on the rear tire the first week and had to get all up in the Stealth bike. It was unpleasant as there was no quick disconnect but I managed and learned a thing or two about the bike.

The Lunacycle kit I learned about from a guy with a channel called "HoboTech". He made himself a nice mid drive bike from the same boost bike I bought.

Hi Tito,
Congratulations ! From what I read, you have been shopping for months before deciding starting with plenty of power for $2K Well Done.
I think you'll find a use for that power.
You're on the right track with Luna, most importantly their Wolf battery. The Luna Cycle YouTube sight has great informative and factual videos.
Does the stealth bomber have a cadence pedal assist function? How much does it weigh, I imagine that depends upon the battery voltage and size.
How does it handle in various conditions?
Good Luck
Mike