Search found 15 matches

by Sepial
Oct 24 2018 4:09am
Forum: Motor Technology
Topic: A bit disappointed by my BBSHD (from EM3ev)
Replies: 16
Views: 1843

Re: A bit disappointed by my BBSHD (from EM3ev)

Hillhater, 2old: It does leave me uncertain about the future... Not a nice feeling. I have been testing the motor the best I could and there was no strange noise, behavior or anything. Motor is super silent. If I was in the US right now, I would have ordered with Luna (or another local distributor) ...
by Sepial
Oct 22 2018 10:33am
Forum: Motor Technology
Topic: A bit disappointed by my BBSHD (from EM3ev)
Replies: 16
Views: 1843

Re: A bit disappointed by my BBSHD (from EM3ev)

Yeah wasn't thinking of the pedaling cadence and I am pretty satisfied with the power right now with my 15s at 30A. Won't do anything for now. If I can't handle the PAS, will probably just fix that part. Thanks a lot
by Sepial
Oct 21 2018 8:32pm
Forum: Motor Technology
Topic: A bit disappointed by my BBSHD (from EM3ev)
Replies: 16
Views: 1843

Re: A bit disappointed by my BBSHD (from EM3ev)

I have read here that 18s pack were fine (after switching caps), could you point me towards the problems I might encounter? Current I wouldn't go over 45A and I'll try to have an external switch so I could switch it on only when I need it. But yeah, it's too bad that we don't have motor temp on thos...
by Sepial
Oct 21 2018 5:08pm
Forum: Motor Technology
Topic: A bit disappointed by my BBSHD (from EM3ev)
Replies: 16
Views: 1843

Re: A bit disappointed by my BBSHD (from EM3ev)

Thanks guys, I am leaning towards the transistor mod, I might change the caps and up the voltage and amps while I'm at it. There is no way I'm removing PAS altogether for now although i do use the throttle a lot. If I would (it's true that the delayed response is also annoying), the grin phaserunner...
by Sepial
Oct 21 2018 11:59am
Forum: Motor Technology
Topic: A bit disappointed by my BBSHD (from EM3ev)
Replies: 16
Views: 1843

A bit disappointed by my BBSHD (from EM3ev)

So let me tell you first that if I had known what would happen in advance I would still have placed the same order because of the lack of alternatives, the BBSHD is a great motor and EM3ev seems to be a great company but I still have a bit of a let down taste in my mouth... I had 2 problems, first o...
by Sepial
Sep 15 2018 8:50am
Forum: Battery Technology
Topic: Designing a flat, structurally sound battery pack
Replies: 3
Views: 383

Re: Designing a flat, structurally sound battery pack

I didn't think of PCB boards, I will have to see if I can find some 30mm long and how much they flex. To be honest the glued cells are actually much stiffer than I expected so your suggestion should be very much stiff enough. Thanks for the heads up about heat shrink. I tore down some batteries afte...
by Sepial
Sep 15 2018 4:02am
Forum: Battery Technology
Topic: Newbie battery options
Replies: 10
Views: 522

Re: Newbie battery options

Good to know flippy. What about the 30q, is there data on this one?
by Sepial
Sep 15 2018 4:01am
Forum: Battery Technology
Topic: Newbie battery options
Replies: 10
Views: 522

Re: Newbie battery options

Actually the GA is tested with 6A discharges as oppose to the PF, 4A discharges. So the GA loosing capacity quicker is to be expected... So I will shut up now and wait for a more experience user to answer this... I am now very interested to know the actual answer!
by Sepial
Sep 15 2018 3:52am
Forum: Battery Technology
Topic: Newbie battery options
Replies: 10
Views: 522

Re: Newbie battery options

Nope, I was wrong. Apparently it's because the PF hold capacity better given a number of charge/discharge cycles.
See last graph on both spec sheet.

PF: http://nkon.nl/sk/k/ncr18650pf.pdf
by Sepial
Sep 15 2018 3:34am
Forum: Battery Technology
Topic: Newbie battery options
Replies: 10
Views: 522

Re: Newbie battery options

Usually it's because of the temps achieved at a given current. More heat = aging cell. But it's not obvious with those 2 because they're both rated at 10A max discharge. I couldn't find a temp graph for the PF but here is a graph for the GA: https://www.orbtronic.com/content/Datasheet-specs-Sanyo-Pa...
by Sepial
Sep 15 2018 3:15am
Forum: Battery Technology
Topic: Designing a flat, structurally sound battery pack
Replies: 3
Views: 383

Designing a flat, structurally sound battery pack

Hi, I'm currently putting together a 14s4p battery pack with the following requirements: * Pack split in 2x 7s4p serially connected for having 2 equal weights, required for transportation (don't ask...) also, no BMS * the 7s4p's need to be flat, arranging them as 2x14 matrix is my preferred form fac...
by Sepial
Sep 15 2018 2:31am
Forum: Battery Technology
Topic: Spot welding overlapping nickel strips
Replies: 8
Views: 749

Re: Spot welding overlapping nickel strips

Yes this design is great, I need to get a CNC laser cutter.
by Sepial
Sep 13 2018 5:07am
Forum: Battery Technology
Topic: Spot welding overlapping nickel strips
Replies: 8
Views: 749

Re: Spot welding overlapping nickel strips

Oh my those bus plates are sexy... If only someone would manufacture them as 2p rolls like they do with slit nickel. What I would love even more is manufactured 2p rolls with round nickel tab linked to larger copper sheet with wire fuses (tesla like), so I can spot weld them, no wire bonding require...
by Sepial
Sep 12 2018 7:56pm
Forum: Battery Technology
Topic: Spot welding overlapping nickel strips
Replies: 8
Views: 749

Re: Spot welding overlapping nickel strips

Thanks guys, makes a lot of sense. Now my conscience is clear AND I understand what is going on. I knew from here that welding copper is much harder but I thought it would be the case only as a top layer. But now you got me interested spinningmagnets, what is the purpose of the nickel between the ba...
by Sepial
Sep 12 2018 2:43pm
Forum: Battery Technology
Topic: Spot welding overlapping nickel strips
Replies: 8
Views: 749

Spot welding overlapping nickel strips

Hi, I have DIY'd a spot welder (thanks to malectrics) that's working like a charm: I am spot welding 18650s with .15 pure nickel with a 3ms pulse and consistent holes in the strip when teared down. So everything is great except that when I try to spot weld the same nickel strips on top of each other...