Search found 365 matches

by johnnyz
Jun 12 2021 7:05am
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 150

Re: Adding extender battery in parallel.

Well..lol...the cells I am using have a very similar resistance and are close in capacity, so should be good. The cells I want to use which I am getting at a good price are EVE 2600 5C. There is another cell also an EVE 3000mah 3C continuous. These are guaranteed grade A but 60 cents more per cell. ...
by johnnyz
Jun 10 2021 4:04pm
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 150

Re: Adding extender battery in parallel.

Yea, untill I get the bike, I wont know but looks like I can design something around it. I def have short legs so thats not a problem, lol. As for voltage sag, generally speaking the higher the C rate the lower the sag, as my vendor says the EVE cells are 5C (2600 mah) so actually more discharge cap...
by johnnyz
Jun 10 2021 10:00am
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 150

Re: Adding extender battery in parallel.

By the way I checked out your battery extender build...nice job...I am going to build something integral with the back seat area, that will look super cool,but not alot of area to work with, hence the 7P deal...but once I get it here then I can start designing something...
by johnnyz
Jun 10 2021 9:53am
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 150

Re: Adding extender battery in parallel.

Ok thanks for the input...Ill find what the R is of the EVE cells. I already know what the PF cells are, as I made many packs using these. So if I combine 18 in parallel, there would not only be more range but each cell will see less load, and hence less battery sag at higher amps.I have a BAC 4000 ...
by johnnyz
Jun 10 2021 6:46am
Forum: Battery Technology
Topic: Adding extender battery in parallel.
Replies: 8
Views: 150

Adding extender battery in parallel.

Just running this through my mind...I have a Sur-ron electric bike coming and I was going to build another 60 volt pack with maybe 7 cells in parallel (16S 7P). The thing is the 2 cells I can get may not work...One is the BAK cells which are 3000 mah but only 2C (3C burst) and the other is EVE at 26...
by johnnyz
Jun 10 2021 6:41am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Yes, but these days, in the time of Covid, things are haywire, and supply chains are constantly disrupted. I dont understand it in its entirety but I cant afford to have huge stock, when I dont know if they will sit in my garage...this year is kind of a feeling out process and im sure that when thin...
by johnnyz
Jun 08 2021 6:50am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Sorry for not being on here for a while... been very very busy...Yes I have some, and ordering more. Also have a line on 85 ah cells and 125 ah cells at reasonable prices...the only thing thats not being reasonable is the market...my vendor tells me one day they are available and the next theyre sol...
by johnnyz
May 10 2021 6:12am
Forum: Battery Technology
Topic: DIY surron 72V battery build (my first battery build)
Replies: 11
Views: 907

Re: DIY surron 72V battery build (my first battery build)

Pretty good...but you didnt have to do so much work...on connecting the batteries in parallel you only need ONE strip...it is the series connection that takes full power...also didnt need the epoxy unless the surron is going into battle...lol...Curious as to why the cells were so cheap?...were they ...
by johnnyz
May 08 2021 10:34am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Thanks for the post...ya that was after a 35 km ride I believe...just wanted to see where they sat. Right now they are all at about 3.2 volts...
by johnnyz
May 07 2021 6:27am
Forum: EScooters/EMotorcycles
Topic: Fechter's Sur-ron Modifications
Replies: 19
Views: 9386

Re: Fechter's Sur-ron Modifications

My supplier tells me that chinese BAK cells rated at 2900 mah are the best they make and 10 amp capable. I ordered 200 and a 80 amp BMS so ill try it out and see.
by johnnyz
May 07 2021 6:25am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

I forgot to mention, after 4 cycles, I tested the voltages of all the cells to see how well they were playing together...here it is..I think its pretty good....
rsz_volts.jpg
rsz_volts.jpg (1.8 MiB) Viewed 494 times
by johnnyz
May 06 2021 1:23pm
Forum: EScooters/EMotorcycles
Topic: Fechter's Sur-ron Modifications
Replies: 19
Views: 9386

Re: Fechter's Sur-ron Modifications

Im waiting on mine...I have a question about the extra Battery you made..is it the same Ah?...I will be making another 60 volt 30 ah pack run in parallel, to get a little extra range.
by johnnyz
May 06 2021 9:56am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Thanks for the tip..ya they are about the same price point as the BMS units I am getting with the cells...and they look like some nice units...
by johnnyz
May 06 2021 6:10am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Im setting up the order today, along with some BMS units. Ive had a challenge from the owner of a golf course ..he wants me to build a pack for one of their golf carts (48 volts) and if its better than lead acid after testing (chuckle chuckle), then he wants the remaining carts done with these cells...
by johnnyz
May 05 2021 2:04pm
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

When I asked for a data sheet it was in Chinese...I asked her to send something in English and she sent me this...not exactly complete, but during my tests, they were correct with respect to capacity. data.jpg They did sag a bit more than I thought however, but like the headway cells I used, this ch...
by johnnyz
May 05 2021 6:28am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Re: Prismatic lifePo4 cells 50ah Sale

Not sure about the location thing..Im from Glencoe Ontario. Thats about 40 Mins from London. As for people buying these, will sell to whomever ...shipping is up to the buyer.. ;)
by johnnyz
May 04 2021 9:23am
Forum: Items for Sale - New
Topic: Prismatic lifePo4 cells 50ah Sale
Replies: 19
Views: 810

Prismatic lifePo4 cells 50ah Sale

Hey there Its been a while since ive been on here...I purchased a test set of prismatic LifePo4 cells, 50 ah to test on a test bike (Emmo DX) cell3.jpg , cell2.jpg , The cells measure about 165 mm tall by 135 mm wide and about 31 mm thick. I wanted to test these on an ebike so I built a 72 volt pack...
by johnnyz
Jul 04 2019 9:44am
Forum: Motor Technology
Topic: Mid drive vs Hub Motor for 10000 watt project
Replies: 95
Views: 13162

Re: Mid drive vs Hub Motor for 10000 watt project

Been so busy with everything...have not had a chance to post...the bike is done and have had to limit the speed for compliance. I made the bike because I had someone who wanted it for the street (he will licence it). I will be posting results, pictures, mileage,etc very shortly...the bike is beyond ...
by johnnyz
Jan 12 2019 4:04pm
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

Ok...well the test results are in.... Both the soldered cell (new but sitting soldered for 8 months) and the untouched cell(also new) were charged by my Imax to 4.2 volts and left to rest 30 mins. The soldered cell came in at 4.157 Volts The normal cell came in at 4.155 Volts I discharged to 3 volts...
by johnnyz
Jan 10 2019 10:57am
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

Ok...as a sidelight and I didnt really want to focus on this but what the heck... I have 2 identical cells..Panasonic 18650PF cells. They are both 8 months old, however, one has been badly soldered to a bunch of cells for all this time...the bottom has suffered some corrosion, as it appeared the per...
by johnnyz
Jan 10 2019 9:54am
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

Nice soldering job and a gun like shown in the video solders so fast the metal on the positive side doesnt have a chance to transfer the heat to the but gluing cells together I have found invites potential problems...I had a pack I did in this manner and because they moved around slightly 2 parts of...
by johnnyz
Jan 10 2019 9:05am
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

Thanks for the response. Yeah the only pitting was at the end or the tip...the 2 parts that are joined once they are put together are fine..however, you cant put a no.1 wire on an anderson connector ...I will be using these, nut and bolting them together and 3d printing a nice cover.. rsz_img_201901...
by johnnyz
Jan 09 2019 10:15pm
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

Thanks for the response and I take no offence..truth is truth, and if I learn something great..however Ive put together 25 packs and I have learned something in that time.. Done properly soldering to cells does not damage them either in performance or capacity (there are numerous studies proving thi...
by johnnyz
Jan 09 2019 9:04pm
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Re: Big 100 Volt 54 ah Battery build

How is the pack suspect from the start?...and use a tab welder using what exactly?..using nickle strip??..and you think that can take 250 amps???...It takes less than a sec to solder the 18 g wire unto the cell, and does no damage whatsoever.The other pack I made worked great, just didnt have the ra...
by johnnyz
Jan 09 2019 3:14pm
Forum: EBike Build Threads
Topic: Big 100 Volt 54 ah Battery build
Replies: 21
Views: 2708

Big 100 Volt 54 ah Battery build

Have not been on here in a long while...thought I would begin posting my new battery build, trying to learn on my previous build of last year. rsz_20180427_154812.jpg I modified an Emmo Zone for performance. I replaced the motor with a QS Motor 16 inch 6000 watt V3 , which has proven to be reliable ...