Danzzigger
1 µW
- Joined
- Mar 30, 2018
- Messages
- 3
Hi all, first post. I have used the search function for the last few weeks to gain as much info as possible about my questions. That being said, if you have links to other posts in regards to my questions, please do so.
Bit about myself, I've come from the RC scene, started with nitro, got annoyed... paid the big bucks to get into electric and have never looked back. I have some basic knowledge of electronics so I understand most things until they get technical... then I use google
My intentions are to build a E bike with a 2004 DH comp frame. Been basing a lot of my stuff on Doctorbass's, Obiwan007, Ohbse, GCinDC and I feel like there's a few more I missed out.
Anyway I'll stay on track to my question in regards to chargers.
How are people charging their big packs? From what I'm gathering, a lot of people are using a 20+ cell BMS to charge the pack. Bypassing the discharge on the BMS as most of the cheaper ones don't have the amp rating capacity required to do so.
Then finding a charger to charge at the required voltage is the next hard thing. So I saw that a lot of people are using meanwell chargers and tuning them to get the voltage they require. From what I'm understanding, all it is, is a Constant voltage and Constant Current Powesupply. So technically it isn't a charger, but just a power supply, the BMS is doing the charging function? I don't understand huge amounts about charging cycles and how different chemistries work, I know that nmih is trickle charged at the end of its cycle. Is there not more to it than pushing a whole lot of 'power' (term used loosely) into a battery and then balancing (discharging) the cells to the same capacity as each other at the end of the cycle?
So I bought one of these ages back, was going to use it to power a stereo to take onto the job in a systainer. Got it cheap on ebay. These are like $25aud or something.
https://kamboti.unpatti.ac.id/2015/11/19/modification-of-artesyn-7001138-for-a-13-5-vdc-69-a-power-supply/
They're pretty light too, weighed it at 1.26kg 13.5v x 69a = 931.5watts for $25
So I'm aware of the adaptto controller and their bms system which apparently takes any 12+ voltage power source and bumps it up to the required voltage using what it seems is a step up toroid or something? Is it possible to do this without going down the adaptto route. I'm doing all of this on a really tight budget. So I'd rather get a Kelly controller or something similar. Trying to keep everything high voltage so as to reduce loss in efficiency. Should I just split the pack so that its only like 4 lots of 5s for charging purposes? BMS for each?
So to give you a run down on what I'm specifically trying to do;
2004 DH comp bike
qs205 1000watt hub motor
A speed controller to match hub motor - thinking about Kelly, unsure of model
120 Samsung cells - fits in the triangular frame, kinda want it to remain stealthish / slim. 20s 6p 74v-84v 9ah
I have a mate whose sourced 246 used samsung INR18650 - 15M SDI 121 (1500mah), 16 samsung INR18650 - 20R M SDIEM 125 (2000mah) and 8 (2500mah) batteries - haven't opened the pack yet. All the battery packs I got were 'broken', ie BMS stuffed, or maybe single cells gone. I'm in the process of charging, discharging, matching etc. Which leads me to another question, how do people most accurately test their cells? should I youtube it? I've just been charging at 0.5c, then discharging at 1amp, writting down the results.
Lastly, what have people been doing to clean up the original spot welds? I tried this, and it works pretty effectively.
Is there a better method?
Thanks guys, I've really been learning a great deal going through this forum!
Bit about myself, I've come from the RC scene, started with nitro, got annoyed... paid the big bucks to get into electric and have never looked back. I have some basic knowledge of electronics so I understand most things until they get technical... then I use google
My intentions are to build a E bike with a 2004 DH comp frame. Been basing a lot of my stuff on Doctorbass's, Obiwan007, Ohbse, GCinDC and I feel like there's a few more I missed out.
Anyway I'll stay on track to my question in regards to chargers.
How are people charging their big packs? From what I'm gathering, a lot of people are using a 20+ cell BMS to charge the pack. Bypassing the discharge on the BMS as most of the cheaper ones don't have the amp rating capacity required to do so.
Then finding a charger to charge at the required voltage is the next hard thing. So I saw that a lot of people are using meanwell chargers and tuning them to get the voltage they require. From what I'm understanding, all it is, is a Constant voltage and Constant Current Powesupply. So technically it isn't a charger, but just a power supply, the BMS is doing the charging function? I don't understand huge amounts about charging cycles and how different chemistries work, I know that nmih is trickle charged at the end of its cycle. Is there not more to it than pushing a whole lot of 'power' (term used loosely) into a battery and then balancing (discharging) the cells to the same capacity as each other at the end of the cycle?
So I bought one of these ages back, was going to use it to power a stereo to take onto the job in a systainer. Got it cheap on ebay. These are like $25aud or something.
https://kamboti.unpatti.ac.id/2015/11/19/modification-of-artesyn-7001138-for-a-13-5-vdc-69-a-power-supply/
They're pretty light too, weighed it at 1.26kg 13.5v x 69a = 931.5watts for $25
So I'm aware of the adaptto controller and their bms system which apparently takes any 12+ voltage power source and bumps it up to the required voltage using what it seems is a step up toroid or something? Is it possible to do this without going down the adaptto route. I'm doing all of this on a really tight budget. So I'd rather get a Kelly controller or something similar. Trying to keep everything high voltage so as to reduce loss in efficiency. Should I just split the pack so that its only like 4 lots of 5s for charging purposes? BMS for each?
So to give you a run down on what I'm specifically trying to do;
2004 DH comp bike
qs205 1000watt hub motor
A speed controller to match hub motor - thinking about Kelly, unsure of model
120 Samsung cells - fits in the triangular frame, kinda want it to remain stealthish / slim. 20s 6p 74v-84v 9ah
I have a mate whose sourced 246 used samsung INR18650 - 15M SDI 121 (1500mah), 16 samsung INR18650 - 20R M SDIEM 125 (2000mah) and 8 (2500mah) batteries - haven't opened the pack yet. All the battery packs I got were 'broken', ie BMS stuffed, or maybe single cells gone. I'm in the process of charging, discharging, matching etc. Which leads me to another question, how do people most accurately test their cells? should I youtube it? I've just been charging at 0.5c, then discharging at 1amp, writting down the results.
Lastly, what have people been doing to clean up the original spot welds? I tried this, and it works pretty effectively.
Is there a better method?
Thanks guys, I've really been learning a great deal going through this forum!