eddymunster

turned up today,won,t get chance to test to test, however three leds lit when I took it out the box and 49v with my meter, funny that the first one didn't even light up and had under 2 volts and took 12 hours to charge, this one only took 3hrs, anyhow won't get chance to run it until next week but I do think I was had off first time. My own fault really,was looking to try these 21700 cells for weight loss and they were the only ones using them, sometimes it doesn't pay to be a guinea pig!!!

My thoughts exactly, funnily enough I haven't been given an answer to that? Going too see what comes back to take that further. I haven't put any feedback on the bay yet so I may be able to do a dispute over this yet

Yes, bit of a case of buyer beware, I have a couple of packs from Jimmy and had no issues whatsoever, if you see a previous post I wanted to save a bit of weight. You live and learn

Bit of an update, my battery is en route back to me after having some cells replaced and a new bms, this is after paying an 88 euro ransom, due to the fact I did my own diagnostic on something they reckoned wasn't faulty in the first place. Once its back and I have tested it me and the vendor will be having one there chats, via ebay and visa. I will be mentioning there name as a warning for others, but to get the ball rolling it's a company that does a lot on the web/ebay and assembles their kit in west germany.

went for ride, seems to work but the cut seems a bit long, might have to tweak the controller delay, early controller so its in the brake switch

This is supposed to do both, will find out tomorrow when I go for a trundle.

just fitted a gear sensor to my bbs02 with an igh, cheap ebay one,any idea on how the led function works. at present mine flashes green and the display unit flickers until I press the shift lever then it turns red, haven,t been for a ride yet but are these things directional, I currently have it hooked up with the wire coming out the back of the unit. anyone fitted one before? thanks eddy

Bit of an update- vendor has sent me a return label to ship back. Will see where we go from there. Thanks for all the help so far. Hoping for replacement rather than repair.

E emailed vendor this morning so we will see what kind of customer service we get. rather they swap pack, will see if I am fobbed off with you checked yourself,etc. They only give 1 month looking at the small print.

Rechecked the pack tonight from B-, the voltages at the sense wires are now B0= 0 BB1=3.81,B2=7.64, B3=11.46,B4=15.28, B5=19.09, B6=22.80, B7=26.70,B8=30.50,B9=30.50,B10=34.30, B11=34.80, B12=38.60,B13=42.40,B14=42.40,B15=46.3. Big fluctuation, B11 stands out at 0.5 volt. Treble checked. little information regarding yesterdays test- I tested the pack voltage prior to removing the bms plug it was 45.9 volts. I checked my readings twice starting at b15 and working back to b1 then from b1 to b15 and got the yesterdays posted values- I wrote a grid up at the time and used this tonight - same methodology. By the look of things I should have done this yesterday as my final test was to recheck the overall voltage which had crept up 46.3. So we seem to have 13 readings- one of which is far from right, and that b8/b9 and b13/14 are wired together. So advise on what to do now really? Vendors advice is to put on a 24hour charge?

Went from B0 on the sense wire, will recheck again tomorrow night, I take it I should be going from B- on the bms board then. sorry in regard to the other reading of the overall pack voltage, it went up 0.4 volts, b- to red on the discharge lead when the sense wire was unplugged.

on checking the voltages at the sense wires from BO- B1=3.83,B2=7.64, B3=11.64,B4=15.28, B5=19.10, B6=22.80, B7=26.70,B8=30.50,B9=30.50,B10=34.30, B11=34.30, B12=38.30,B13=42.20,B14=42.20,B15=46.0. So the voltage on the pack looks good, the lowest cell works out at 3.7 and the highest 4.0 the rest are 3.8 or thereabouts. B8/B9, B10/B11 and B13/B14 are wired into one cell group each. Also checking the voltage on B- to the red discharge lead the voltage has gone 0.4 of a volt. I have a feeling this BMS has the LVC for a higher voltage pack maybe 58/63 volts with it being 15s as the pack is a 13s pack. the vendor advertises this as a smart bms so is it programmable and how. anyones thoughts?

Just had an email from vendor and wanted me to charge up again and check voltage after 24hrs- seems pointless, so lifted the wrap back, its a softpack, to check sense wires, and its been fitted with a 15s 30amp bms, 17 wires in total,checked voltage at b- to pos=45.9 volts. so my next question is 1- is this accepted practice. 2-how do I go about check the sense wires. 3- if this is 15s would the lvc point threshold not be higher voltage and this is the reason it shut down or can this be programmed to suit 13s.? any help appreciated.

update- fitted my old shark pack and back in business - went for a 15 mile ride so email fired to vendor to see were we are going to go with this. will name and shame if I don't get a positive outcome. so far the moral of the tale is I should have stuck with Jimmy the old pack gave no trouble whatsoever if they ok for me to test pack and don't give me the you invalidated w/t -happy days if not I might end up with a rather expensive paperweight if its the cell pack!!

After a reply from the vendor last night of its probably not the battery I am going to plan b- refit my old battery which is a known good one and see if it all fires up- no issues until yesterday. Thanks for the info on the BMS Andy = I was going to go down the road of charging it up again. But what you said makes more sense- due to work it will be later in the week

Fitting bms shouldn't be a problem, built ecu's from scratch for motorcycle and car applications, hoping that supplier will send one out rather than ship back as the charges for shipping would be the same as the bms.

Decided to order up a new 48v softpack fom a well established supplier via ebay 48v 12ah 30a bms. The good news was it arrived early and is nice and light- 3 kilos. However when checking the state of charge on arrival nothing doing on the leds, out with the voltmeter 2.4 volts. Bit odd so put it on charge on wednesday and after 6 hrs according to my charger we are good to go with 54.6 volts. email supplier to check shipped voltage and its 30% soc and don't read too much into the intial reading as its a smart bms and would be in sleep mode. Checks this morning prior to going for a wobble and we are on 53.8 so its lost a touch since wednesday. Off we pop, 4.5 mile in and the display goes off and with it any assistance, very odd never done that before. About half a second prior to this a had a look at the display and had 47.2 volts. At the time I was only pulling 5amps out the pack on the flat in pas 3. For information it's a bbs02b 750w - 20 amp set on the controller with a 42lvc. Walk of shame home- check the led on the pack 50%, check the voltage again 2.4volts. Anyone have any ideas- I have a gut feeling this is could be BMS related rather than the cell pack itself due to the nature of the fault, cannot see how we lose 40 odd volts so quickly. The pack itself wasn't hot and niether was the motor when i pulled over. Decent cells Samsung 40t 21700. Awaiting reply from supplier but this is in case I have to sort it myself as I changed the connector to a spark arrestor xtc90 and this causes a warranty issue- they only give a month by the look of things. So any advice on the fault/ diagnostic checks or recommendations for a good 30amp bms supplier thanks eddy

they are claiming 3kg all up- not the prettiest of things its a softpack- looks like i am going to to order in a couple weeks.

looks like enerpower have gone down the 40t cell route on my behalf- 48v 12ah 30a bms- 320 quid so not a kings ransom over me building one. Probably next month so will report back

not sure I want to let the genie out the box ha ha. How many cells do you reckon I need out of curiosity and do reckon we could get away with 3p.

Yes I believe life cycle isn't as good, I know luna have just released a 52v mini wolf pack in 1p using samsung 21700 40t cells but its only 4ah, watt hours too low for my use,they make some big claims about the cell choice but I think I might sit on the fence for now and see if anyone decides to use these cells in future rather than build my own 2 or 3p set up, Jimmy didn't seem too keen suggesting I went down the cell pouch route, bit unfamiliar with this though.

I run alfine 8, its done about 3000miles with a bbs02 750w mid drive and had no issues so far. Shimano state in the spec it's suitable for ebike use but I think we are only talking 350 watts here.

Thanks for the info, sorry cells are lg m50 but think thats splitting hairs, here's the link https://enerprof.de/fahrradakkus/softpacks/akkus-48v-13s/179/softpack-akku-48v-10ah-bms-20a-xlr-3-mit-m50 I have noticed a 52v 3p hardcase pack on ebay which looks like the one whoosh had on here a bit back but he is not supplying yet due to cost/value for money, but no idea on the weight. Did speak to Jimmy and he isn't that impressed with the format at present, the seatpost is a bit of a non starter cause I am not as agile as I used to be and run a dropper post, tried the battery on the top of frame but that had a similar issue of height. 2 or 3p might provide with enough clearance to get back on the frame but I was thinking with the drop in amps its all going to get a bit saggy and hot with a 750watt motor, the current set up the battery is a bit warm to touch at the end of a run in the backpack and I do have that nagging thought this could go a bit pete tong, even though I put some vents in it, also it is a bit over the top weight wise at over 9kgs. Open to suggestions really, I have a good rear rack but looking at the bolts that are on the linkage for the swing-arm - 6mm I am a bit concerned about sticking all that unsprung weight through them especially as the wheel already has an alfine 8 in it, always felt i would be pushing my luck on that one. As I say open to suggestions.

I was looking at enerpower site and they are selling 48v 2p 10ah battery with 21700 cells -lg 50e, looks nice and light, anyone have any thoughts on whether this would run a bbs02 750w for a 9 mile commute. I have a old school marin/whyte 46, so use a back pack. Its one of Jimmy's 17.5ah whale packs, cracking battery but bit heavy in a back pack, I normally get 4 days run time out of this as I hardly use the throttle, so was thinking of getting the weight down and charging in work for the run home. My other option was to build a 14s 2p myself with the samsung 21700 40t cells, they are 35a rated discharge with 4ah capacity, the but is this will be my first battery build. great fun this ebike lark though, nearly as much as mucking around with motorcycles any advice would be appreciated.