Choosing a proper battery 48V 750W

Batteries, Chargers, and Battery Management Systems.
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tomjasz   10 GW

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Choosing a proper battery 48V 750W

Post by tomjasz » Mar 31 2015 9:25pm

I own another DD. A 49V 750W MXUS with a Lyen 9 FET 3077 Mark II (Sensored) controller. This is my first DD and I'm confused about choosing a battery output. The battery builder is new, but comes highly rated, there are choices on continuous output and BMS. How do I choose?

It's a nice build with heavy spokes and Alex DM rim. Controller is regen ready and set up for CA connector.

After building 4 BBS meds ( another arrives in the morning) I'm excited at spreading my winds.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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Nobuo   10 kW

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Re: Choosing a proper battery 48V 750W

Post by Nobuo » Mar 31 2015 10:07pm

Lyen 9 FET is a 30A controller if I'm not wrong. So the battery should be capable of 60A max continuous and with a 30A continuous BMS would work like a charm.
What format and chemistry would you need?
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tomjasz   10 GW

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Re: Choosing a proper battery 48V 750W

Post by tomjasz » Mar 31 2015 10:18pm

I'm going to use 18650 Samsung fit to an EM3ev Triangle Bag. I have ten more bags coming. I'm keeping one, I like the look of the bag better than the dolphin case or bottle battery. Not sure on which bike yet. Likely on a Trek Pure. But I have another Trek upright. I remain a sucker for crank forward comfort bikes here. I might go full dork and do a front drive... No hills...Studded tire and some weight on the front actually makes for a decent ice bike. Learned that this winter. Front wheel traction just needs some extra weight. Drift bike...
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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Nobuo   10 kW

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Re: Choosing a proper battery 48V 750W

Post by Nobuo » Mar 31 2015 10:34pm

Yeah, front hub is awesome too and very simple, if you know how to balance the weight and secure the battery on the middle frame it would work flawlessly.

For example with samsung 26F I would doing a build like this

-13s10p, 130cells.
-48V 26Ah 60A max continuous
-30A BMS
-dimensions of 210mm x 155mm x 70mm. It would fit the bag? You know you can make the shape you want
-it would be 6Kg (12lbs)
* Lithium + Air = Fire * <-----> ** Lithium + Chemical-Additives + Air = ZERO Fire **
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tomjasz   10 GW

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Re: Choosing a proper battery 48V 750W

Post by tomjasz » Mar 31 2015 11:50pm

Whose BMS did you use in your builds? BTW My welder is ordered! Your video inspired me to move forward. Thanks.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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Nobuo   10 kW

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Re: Choosing a proper battery 48V 750W

Post by Nobuo » Mar 31 2015 11:57pm

Oh really? Thank you :D

for 48V 30A I use this one http://aliexpress.com/item/13-lithium-b ... dVersion=1

They don't send exactly the same always, PCB is the same, but there must be differences on the number of FETs and their specs, although the overall performance of 30A keep the same
* Lithium + Air = Fire * <-----> ** Lithium + Chemical-Additives + Air = ZERO Fire **
<Battery and EV works>
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999zip999   100 GW

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Re: Choosing a proper battery 48V 750W

Post by 999zip999 » Apr 01 2015 4:38am

Nice to see your are building a healthy battery for this 10p. So many trying to force a low P battery to work.

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kje   100 W

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Re: Choosing a proper battery 48V 750W

Post by kje » Nov 30 2015 5:34pm

Nobuo wrote:Oh really? Thank you :D

for 48V 30A I use this one http://aliexpress.com/item/13-lithium-b ... dVersion=1

They don't send exactly the same always, PCB is the same, but there must be differences on the number of FETs and their specs, although the overall performance of 30A keep the same
Nice video. ☺ How has your bms performed?
Does it work with a 25A controller? (BBBS02 750W)

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Nobuo   10 kW

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Re: Choosing a proper battery 48V 750W

Post by Nobuo » Nov 30 2015 6:11pm

those BMS boards work pretty well until around 2500W controllers (60A peak, 30A continuous). More than enough for any mid-drive system combo
* Lithium + Air = Fire * <-----> ** Lithium + Chemical-Additives + Air = ZERO Fire **
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kje   100 W

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Re: Choosing a proper battery 48V 750W

Post by kje » Dec 01 2015 5:11am

Nobuo wrote:those BMS boards work pretty well until around 2500W controllers (60A peak, 30A continuous). More than enough for any mid-drive system combo
Nice ☺ I bought it. What is the max charging amps on this bms?

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Nobuo   10 kW

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Re: Choosing a proper battery 48V 750W

Post by Nobuo » Dec 01 2015 11:51am

Depends which board do you receive, but all of those I've tested can charge to 6A
* Lithium + Air = Fire * <-----> ** Lithium + Chemical-Additives + Air = ZERO Fire **
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