I waant to go LiPo!

Hi Fury,

It was 25C I was after, but I've no doubt they will have them now that I have my other 2 packs, lol

Yeah BT means that there is no limit for the first 1- whatever you set it to take off harder!

The battery limit means it limits the current drawn from the battery, phase is the limit to the motor, but you can fry your motor and fet's if you go over the limits of both!

I think though if you limit the battery current too much you won't be able to climb hills or accelerate too quick or be able to hold your top speed so good, But it's good if your battery can't take the amp draw!

Phase currents will allow you to go accelerate faster or climb hills better but too high and it's bye bye phase wires and motor! It's nice to be able to adjust both though!

I long for the day there is an integrated control system where you adjust everything from the handlebars, the cycle analyst if good, but there is too much of a delay in limiting, I would rather it software based directly to the controller!

A temp sensor in the motor linked to the controller would also be nice along with temp monitoring display, slow start option would be nice also.

I don't ask for much do I ? :mrgreen:


Mark
 
Thanks for the info on phase and BT :) im still learning a lot of this stuff myself.

Looks like the newer version of the CA can monitor temps and other stuff as well so they are getting better, Also cant the CA DP model change the current limits on controllers that support it from the handlebars already? I dont think it will be long before the CA can do it all if you ask me.
 
I never heard the new cycle analyst reads temps?

And yeah it does limit the speed and current, however I find it takes a second for it to react so you end up with a huge jolt in power before the limit kicks in. I don't like it, but it would have it's usefulness for a really long large hill climb, you could turn back the power when you get to the hill to safe limits!
 
HI everyone,

I went for a 35 mile spin today. It was nice and warm 21 degrees Celsius 80% humidity so off I went, it was a fair bit windy and I went to the hill, I put in a lot of effort on the hill and tried to keep the power to no more than 600 watts, even at 300 watts it's amazing how it helps you get up a steep hill !

I used just 8ah so that was good going over 35 miles, so Now I know that the 10ah pack is plenty for me, I probably would have used less only for the wind!

at around 7.5 ah the controller started limiting the power again, but having all 4 packs makes a difference, the packs still get warm but not very warm and they were all between 3.85 and 3.87 volts so I think that's pretty good ?

What should I have my lvc set to, I currently have it set at 42 volts ?

I'm pretty sure I could get 9 or 9.5 ah out of the pack no problem, if I really needed to!

I think the block time set to 0 makes a difference al right, I don't get the kick of torque that I used to, instead it picks up nice and smooth, I will set it back to 1 and see if it makes a difference, but at 35 amp battery and 70 phase it's got plenty of poke and I don't need anything more, I am really happy with the mac, for me it's the perfect motor!


Mark
 
Hi guys,

I'm really liking this LiPo, it charges quick enough. I fast balance every time just to be sure. I never have a balance issue even when I used 8.5 ah out of 10.

I have it wrapped up because I'm afraid of damaging the cells, it's a pity there is no 6S hard case lipo batteries!

I got my other 2 x 4S and I'm getting Andersons tomorrow and I'll test it out tomorrow evening, but I think it will be way too fast, but when I get my speed switch it will be very useful!


Mark
 
Like i have said before, set your LVC for 3.5v-3.6v/cell minus your peak voltage drop per cell.

So if you are running 10 cells and you are dropping 2v at peak amps, you need to take your target figure and reduce it by 0.2v. Thus, you'd use 3.4v/cell x 10 = 34 volts.

But the LVC should not go below 3.3v/cell, that is about where your lipos are really unbalanced.

BTW your amps / phase is not the real output value. For example, i set my amps to 28 / 70 and i get something like 36 amps peak draw.

Also, block time makes no perceptible difference on my 9FET controller. Maybe it does on yours.

80% humidity sounds like the balls..
 
Hi David,

Yeah I will reset my lvc to 39-40 volts, that should cure it, I think there is around 3 volts drop on max current. A lot better than the ping! But the ping was and still is a good battery!

I doubt I will go over the 8ah much, I want to get to mount leinster, but it's about 24 miles there and 24 back + the climb, the peak is 2600 feet and I'm only 100 feet above sea level here, so there is a lot of up and down before I get to climb and the last bit is about 21% grade, I don't know if the mac could do it, and I would need a lot more than 10 ah. The other thing I could do is drive to the base of the mountain and cycle the rest!

From playing around with the phase and battery currents I may have assumed 0 bt made a difference, so I will change it back to 1 and see if it makes a difference, bit I'm very happy with it now. It's a lot smoother without the wallop of torque on take off, it's not necessary and it builds up speed quick enough for me. That kind of current on take off may be necessary for dd motors but definitely not the mac!
 
Hi everyone,

I went for a 16S LiP0 sprint today, 41 mph max speed, but more like 35-38, what a buzz! :mrgreen:

I saw 2700 watts max acceleration, but phase wires and motor were only warm after 2 miles at 35-38 mph, however hills still have to be eaten with caution, I haven't taken it on any serious hill climbs on 16S yet!

I think 1800 watts @37 mph was being consumed it was around that anyway, that's battery killer speeds, but fun!

The funniest thing is the bike was actually stable at 40 mph, more so that 30, very strange, and I wasn't imagining it! :D

I wish someone would start making proper bike frames for electric conversion, Bicycles are just not built for high speeds and they are too high for stability.

My girlfriend says I can't get a motorbike it's like living with your mother again being told what ye can and can't do.

Yet she doesn't seem to think anything about doing 40 mph on a bicycle LOL

Does it get worse if you are married ? lol
 
o00scorpion00o said:
Does it get worse if you are married ? lol
Click to expand...

My girlfriend didn't want Lipo's in the house after she saw some of LFP's videos :shock:
*I don't know why I showed her that

So I ended up going out and buying a metal tool-box, and a cheap smoke detector to go inside.
That then sits in the bathtub.

It's all about "compromising"... If you get a motorcycle you can compromise w/ a lot of good quality protective gear. :wink:
 
Hi EBJ,

HA HA I didn't show My girlfriend any LiPo fire videos, lol but I charge in the house because my shed is tiny and I have no power there, but I do store them in the shed!

Yeah regarding the protective clothing, sure you can have all the protective clothing in the world but if you come off at 50+ chances are you are history!

But most of the accidents, well here anyway I think are because they go too fast and the roads are terrible, but road quality is only part of it. They should ride at speeds appropriate to the road and conditions!

I see them going at speeds well in excess of 80 mph on country roads here, it's incredible and the police are total fools as they only sit on the motorway catching people on good roads doing 10 mph over the limit. A nice 80 Euro fine, they make a lot of money that way but it doesn't improve road safety a bit!

But I would love a nice cruiser bike, someday maybe, but I don't have the money now and Insurance would be around 600+ Euros anyway and I couldn't justify paying more for a bike than the car. The Prius insurance costs 450 Euros a year for the two of us!

Bikers have a very bad reputation!


Mark
 
EBJ said:
o00scorpion00o said:
Does it get worse if you are married ? lol
Click to expand...

My girlfriend didn't want Lipo's in the house after she saw some of LFP's videos :shock:
*I don't know why I showed her that

So I ended up going out and buying a metal tool-box, and a cheap smoke detector to go inside.
That then sits in the bathtub.

It's all about "compromising"... If you get a motorcycle you can compromise w/ a lot of good quality protective gear. :wink:
Click to expand...

I think you have to be realistic and know what can and can't happen so that it's not a surprise to anyone.
I showed my lady that stuff and she thought it was cool until i told her i'd be using them on the bike, LOL.. but after a year of owning lipo, we are both more relaxed about it. Call me a fool but i charge them on the bike in a padded, non metal enclosure.

My lady made me buy a helmet recently, i then proceeded to have my first bicycle accident after 12 years of riding. Sometimes our ladies just care about us killing ourselves more than we do, lol.
 
Hi David,

Yeah I know they care, but don't they realise that ye can get killed crossing the street, or even a truck can get a blow out on the motorway and squash you like a bug lol.

Most of the motorbike accidents are from guys riding like fools at very high speeds, I see it here all the time! drive a car in the same way and your chances of severe accident go up that and the fact you can kill someone else too!

But I ride with my helmet motor or not.

But hey I'm not getting a motorbike any time soon!

I don't charge my LiPo in anything special, but I keep an eye on it, I store it in the shed, I do miss the simplicity of BMS charging and the peace of mind of keeping LiFeP04 in the house.
 
Hi Eeryone,

I found this charger on evassemble

http://www.evassemble.com/index.php?main_page=product_info&cPath=3&products_id=7

They can set the voltage at whatever you want.

So for 16S LiPo at 4.15 V per cell the would be 66.4 volts! And just over 9 amp charging is not bad, or I could go for the 300 watt for 50 Dollars, I don't really need fast charging, but the 9 amp charging could be handy!

So I would be serial charging, These cells have not gone out of balance so I don't know what all the fuss about bms is? I have not balanced charged the last 4 charges and they just don't go out of balance, I did keep an eye on them just in case, I just wanted to see if they would keep in balance!

The zippys are rated for 2 C that's 10 amp charging for 1 brick and the way I was charging means I can charge in parallel at 40 amps, but charging in series means I can only charge at 10 amps, is that correct? Still plenty, just want to be sure!

Would it be safe to leave the eassemble charger plugged in when the charger switches off? I know that LiPo can't take a trickle charge so I'm assuming the charger will actually switch off completely ?

Thanks again,

Mark
 
Looks like a nice charger. Price isnt bad at all for the wattage you get. If you are charging in a 16S2P lipo setup so 10AH of 16S then you should be able to charge at up to 20amps. This chager would in that case charge at just below 1C so no sweat there.

o00scorpion00o said:
Would it be safe to leave the eassemble charger plugged in when the charger switches off? I know that LiPo can't take a trickle charge so I'm assuming the charger will actually switch off completely ?
Click to expand...

Well, according to the spec it should terminate the charge fully (supplying no power to the battery) once the charger detects a current less than 5% of max on the CV phase of the charge so in your case once input current drops below ~450ma whilst maintining your pack voltage then the charger would terminate. As with anything like this, weather you trust the circuitry to work as described is up to you. I think id like to hook a watt meter between the two and see what really happens once it "turns off" :)

a little OT, but i finally decided to buy some lipo :) Got 4x 20C 6S 5000mah zippys delivered from HK on Saturday, all seem fine on arrival, balance charged them all and spent most of yesterday soldering up the battery harness and going to give them a run when i get a minute then ill get to see what all the fuss is about lol :evil:

Do you use any LVC or voltage monitoring stuff at minute?
 
Hi Fury,

Yeah I use cell log 8S. So I would be keeping an eye on the charging just in case.

I set the lvc in my controller but as Neptronix says the zippy's are very over rated and they sag a fair bit under load, so you need to set your lvc - the voltage sag.

I think 20C zippy's would be more like 10C so take that into account!

I suppose I do see the advantages in bms really LOL

Yeah I forgot that is 16S 2P I have for 10ah. 4 x 6s 5ah and 2 x 4S 5ah!

20 amp charging would be nice, but unnecessary for me really the 600 watt would be good enough, 1300 watts charging a 10ah pack lol Nice :D

They have 8KW chargers on evassemble too! :shock: :twisted:

That's around the power of an electric shower 8-9.5 kw! :mrgreen:

Someday I will build a high power DD setup and have about 80 volts 30-40 ah and 1kw charging, hopefully they will have a decent bms available by then as I want to leave the batteries enclosed.

I think there will be different batteries on the market by then safer and twice the capacity of LiPo!


Mark
 
I would have bought some cell log 8's but HK stopped selling them by the look of it. I ordered some of the little £2.50 lipo LVC buzzers from Ebay and going to test tehm out of accuracy and see if they hold up, if they are crap ill buy some cell logs from progressive RC, just didnt want to wait a couple of weeks for em to be honest even though they are a cut above the rest.

I did notice that the zippys sag a bit, but its got to be better than my li-ion pack im running at the minute... i get 4 full volts of sag on that thing running at 20 amps... 39V resting, 34.9v minimum according to Watts up meter just going 100m down the road at WOT :oops: :oops:

Will be getting a CA soon and a lyven 12fet controller so will be able to manage lipo LVC with those but for the moment i will be the LVC... :? once i get lyens controller i may well go 18s just for the hell of it :twisted:

a good high rate lipo BMS would be about the best thing in the world right now, but i dont think it will ever happen as i have a feeling lipo will not be the best choice for us in a year or two's time.

an 8KW charger would be sweet, wold charge my 4 lipo packs in 3 minuts 20 seconds if they could take it haha. That would be down into petrol tank refill time teritory :) I dream of making my own electric car some day but money they way it is right now, thats a long way off :(

Keep me posted on how your Lipo's are holding up, ohh and do you protect your lipo's in any way or just stuff them in a bag / backpack?
 
yep indeed I protect them, 6 packs lipo exploding in a fireball is something I don't want to happen, I also have them taped together to prevent them hitting off each other when they are bouncing around in the Topeak bag. I have it stuffed with bubble wrap to fill the empty space, there is a lot of it since I sold my 20ah ping!

It certainly wouldn't take much at all to puncture these cells, It's not worth the risk!

I wish they made 6S hard case packs!
 
o00scorpion00o said:
yep indeed I protect them, 6 packs lipo exploding in a fireball is something I don't want to happen, I also have them taped together to prevent them hitting off each other when they are bouncing around in the Topeak bag. I have it stuffed with bubble wrap to fill the empty space, there is a lot of it since I sold my 20ah ping!

It certainly wouldn't take much at all to puncture these cells, It's not worth the risk!

I wish they made 6S hard case packs!
Click to expand...

I know, i would have loved to get some hardcase packs. But im hoping to make something similar myself, placed an order for some 2mm perspex sheet and going to try and fabricate some makeshift hardcases for them. Just need to find some good plastic glue to hold the sides together. I dont know why but i was expecting the packs to be a little more robust... it almost looks too easy to puncture one of these packs. Id hate to to guess of the chances of one of these surviving a nose dive into the tarmak with a park jet :S
 
Ypedal said:
quarter inch ABS works well:
http://ypedal.com/Cyclone/cyclone4.htm
Click to expand...

Cheers Ypedal, you're the one i got the idea of plastic sheet from, just couldn't remember where i had seen the pics :)
 
Hi Ypedal,

Interesting set up. Why didn't you choose series charging?

I wouldn't have the patients for all that wiring!


Mark
 
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