New em3ev batterý pack

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Alan B   100 GW

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Re: New em3ev batterý pack

Post by Alan B » Aug 05 2018 11:13pm

BMS's for higher current have a lot more FETs, and cost more. Whatever the vendor rated it for, it probably doesn't have a lot of margin. The amount of nickel welded into the pack is also based on the vendor's design. Exceeding that will increase heating in the interconnects as well as the cells and BMS. The ambient temperature becomes important, and the duration of the high current. Put a temperature probe or two against the battery and do some testing..

Westhumboldt8   1 µW

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Re: New em3ev batterý pack

Post by Westhumboldt8 » Dec 22 2018 11:19pm

Any update on pictures of how u ended up mounting the battery?

Electrick   10 mW

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Re: New em3ev batterý pack

Post by Electrick » Dec 23 2018 12:40am

Very soon in the new year. Have been using my stockpile till now.
Have an idea that's expensive and poorly thought out.
Right up my alley! Here's how the Kona fatty turned out..

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E-HP   10 kW

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Re: New em3ev batterý pack

Post by E-HP » Dec 23 2018 12:35pm

Electrick wrote:
Dec 23 2018 12:40am
Very soon in the new year. Have been using my stockpile till now.
Have an idea that's expensive and poorly thought out.
Right up my alley! Here's how the Kona fatty turned out..
Is the battery a permanent installation or removable (for charging, etc.)?

I have similar clearance as your Kona, on a Cove frame I'm converting, and landing on using 1/8" x 2" aluminum bar stock, padded to support the battery, and a couple of side pieces for lateral support. Planning on rivet most of it, but making the lateral supports on one side removable, in order to take the battery out of charging. :bolt:

I'm not making any cuts on the materials until I see what you come up with. :wink:

strepto   100 µW

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Re: New em3ev batterý pack

Post by strepto » Jan 04 2019 1:57am

Hey does anyone know the name of the charge port connector that em3ev use? It looks like a 3 pin mini DIN plug but it's slightly different... and the charger side is male.

Am making up my own second charger out of existing 12-24v supplies (I have a lot of amps available) and a boost CC/CV module.

Electrick   10 mW

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Re: New em3ev batterý pack

Post by Electrick » Jan 04 2019 2:01am

Em3ev use a proprietary charge connector. You can buy a Anderson hookup with the connector I believe.

strepto   100 µW

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Re: New em3ev batterý pack

Post by strepto » Jan 04 2019 2:03am

Sigh. Ten points from Hufflepuff.

Cheers for the quick reply.

Electrick   10 mW

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Re: New em3ev batterý pack

Post by Electrick » Jan 04 2019 2:43am

@E-HP
I've been busy with life, but will say that 2 triangular sheets, made holey enough,
Will contain these units. In the process, will provide pics when done.

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Re: New em3ev batterý pack

Post by Electrick » Jan 04 2019 11:29am

Image

chvidgov.bc.ca   10 kW

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Re: New em3ev batterý pack

Post by chvidgov.bc.ca » Jan 04 2019 12:35pm

My friend bought one of the EM3Ev packs from here in Nanaimo British Columbia Canada, and it arrived safe and sound in about 3 weeks. Its 14S7P. The BMS app works nicely on his phone via Bluetooth, albeit a wee bit primitive. Getting insight into the exact millivoltage of each of the 14 cell groups is super useful, as well as the overall pack voltage. All the groups were within 5 millivolts of each other at the 90% charge state. According to their web site it balances at the 90% level which is super nice, as it means he very rarely needs 100%, and doesn't have to worry about the balance-state so much as I - I have an earlier edition of the EM3EV packs. I also like the on-off switch on the pack and the LEDS on the outside of the pack which gives a rough indication of charge state, as well as whether there is any power on the XT90s output. Nice to shut the bike off with the pack still attached, as many cheap China controllers have no on-off switch. These are super nice packs, and match the specs for weight mentioned on the web site. My friend cut 10 pounds over his old BMSBattery LiFPO4 15Ahr pack, and picked up an additional 10Ahr. The pack was around 1100Cdn, to his door. Since most of his riding is in the top half of the pack, the average voltage is well north of the 53.8V full charge of the old LiFP04 pack. All in all a great upgrade, and very satisfied so far. You can buy XT90s spark arresting pigtails, pre-soldered from Luna, if you need some more for things like inline DCDC converters, or CA shunts and the like. Its matched to a 9C front hubbie, and probably is under 1C on the biggest of hills around Nanaimo - he mostly runs at under 200 watts most of the time - maybe he spikes to 30ish amps on a big hill.

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pwd   100 W

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Re: New em3ev batterý pack

Post by pwd » Jan 06 2019 1:13pm

Electrick wrote:
Jan 04 2019 11:29am
Image
FYI, I'm not seeing the photo. Here is what I did with mine:
IMG_20180802_110059.jpg
Current Build:
Rocky Mountain Element
Magic Pie 4 front + Leafmotor 1500 rear w/ WCEC 18fet
em3ev 14S5P 30Q + 14S6P 25R pack
Build Thread: https://endless-sphere.com/forums/viewt ... =6&t=98286

Old Build:
GIANT ATX 980 w/ Cycle Analyst v2.25
Golden Motor Magic Pie (internal controller) X2
14S3P 15aH: 6X 6S 5000mAh + 3X 2S 5000mAh LiPo pack

hbgb   100 µW

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Re: New em3ev batterý pack

Post by hbgb » Feb 13 2019 12:33pm

Very cool pwd! How did you attach the strap loops to the metal?

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pwd   100 W

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Re: New em3ev batterý pack

Post by pwd » Feb 13 2019 1:23pm

Thank you! The loops you see are single links from a chain. I wrapped the links with a strip of sheet metal and spot welded the strip (with the link) to the battery tray. The fabric hook and loop is just sewed onto itself. Here is a zoomed image:
IMG_20180802_110059_zoom.jpg
IMG_20180802_110059_zoom.jpg (232.07 KiB) Viewed 694 times
Current Build:
Rocky Mountain Element
Magic Pie 4 front + Leafmotor 1500 rear w/ WCEC 18fet
em3ev 14S5P 30Q + 14S6P 25R pack
Build Thread: https://endless-sphere.com/forums/viewt ... =6&t=98286

Old Build:
GIANT ATX 980 w/ Cycle Analyst v2.25
Golden Motor Magic Pie (internal controller) X2
14S3P 15aH: 6X 6S 5000mAh + 3X 2S 5000mAh LiPo pack

atheeromar   10 µW

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Re: New em3ev batterý pack

Post by atheeromar » Mar 20 2019 1:57pm

This is my first post on this site!

This is my take on the battery installation. Using 3 small metal pieces with rubber padding. One of them with a built-in locker which locks into the bike frame and secures the battery in place. The one underneath sits on the bottle holder sockets.
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Electrick   10 mW

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Re: New em3ev batterý pack

Post by Electrick » Mar 21 2019 12:29am

Very elegant! Nice work..Mine is similar but uses both tubes. Dealing with a smaller space will do that.
Will finally try to get some pics to stick!

atheeromar   10 µW

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Re: New em3ev batterý pack

Post by atheeromar » Mar 21 2019 4:40am

Thank you. Eager to c yours. Your black bike seems to provide a very nice fit for the battery. The other one is a bit of a challenge.

Rethinking about my build; I'm a bit concerned about the plastic cracking on the underside with all the vibrations while riding. The surface area on which the battery lies seems not large enough. What do u think?

Working today on the electrical installation for my bike :-)
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tolkaNo   100 W

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Re: New em3ev batterý pack

Post by tolkaNo » Mar 21 2019 11:36pm

What are the dimensions on that em3ev hard case?

atheeromar   10 µW

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Re: New em3ev batterý pack

Post by atheeromar » Mar 22 2019 6:15am

tolkaNo wrote:
Mar 21 2019 11:36pm
What are the dimensions on that em3ev hard case?
see page 1 of this topic
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Lenk42602   10 kW

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Re: New em3ev batterý pack

Post by Lenk42602 » Mar 22 2019 5:58pm

KIMG0506.jpg
KIMG0505.jpg
KIMG0507.jpg

atheeromar   10 µW

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Re: New em3ev batterý pack

Post by atheeromar » Mar 23 2019 12:06pm

@Lenk
where did u get this mount system from?
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Lenk42602   10 kW

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Re: New em3ev batterý pack

Post by Lenk42602 » Mar 23 2019 3:04pm

built it

atheeromar   10 µW

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Re: New em3ev batterý pack

Post by atheeromar » Mar 24 2019 4:52am

Amazing! :bigthumb:
It's just 2 good to be done in a workshop.
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