CyberWall
- Thread starter Scepterr
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Scepterr
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- Feb 19, 2017
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Demo status display up and running. Will post all code and part requirements once it's done.
Display Components:
WS2811/WS2812 Led string or matrix
Teensy 3.0/3.1/3.2
OctoWS2811 Adapter
Cat6 Cable
Load Appropriate PSU(I measure allLEDs at white to determine peak load)
Planned Features:
Bank Voltage,CurrentLoad and Temp
Pack Voltages
The color of the displayed voltages will reflect state, high to low will be green to red, current high to low will be yellow to orange, this can be whatever colors and applied to whatever is shown
Display can be single line,multi-line,scrolling,static, can show icons instead of numbers if you make a high pixel density display
WS2811/WS2812 Led string or matrix
Teensy 3.0/3.1/3.2
OctoWS2811 Adapter
Cat6 Cable
Load Appropriate PSU(I measure allLEDs at white to determine peak load)
Planned Features:
Bank Voltage,CurrentLoad and Temp
Pack Voltages
The color of the displayed voltages will reflect state, high to low will be green to red, current high to low will be yellow to orange, this can be whatever colors and applied to whatever is shown
Display can be single line,multi-line,scrolling,static, can show icons instead of numbers if you make a high pixel density display
Robert Baumer
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Scepterr said:Went a bit crazy, decided to rewrap and label all my cells, 3 packs down, 4 to go
I like the label idea, it keeps it clean and neat. I guess I will head out to staples and get some labels...
Scepterr
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If you're interested I'm using the Dymo 450 Turbo label printer, and the labels are called 2-up 1"x" SKU 30333RobertBaumer said:Scepterr said:Went a bit crazy, decided to rewrap and label all my cells, 3 packs down, 4 to go
I like the label idea, it keeps it clean and neat. I guess I will head out to staples and get some labels...
CrankyCoder
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- Mar 11, 2017
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daromer said:
I have a bunch of stuff on my mysensors network so I plan on doing temp monitoring just using a small arduino and a 1wire bus to a bunch of temp sensors same as you recommended with the pi, but Ill use the arduino to report back to my central stuff.
jesusangel
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- May 28, 2017
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Solar chargers use to be for 12v, 24v or 48v systems, so you must link in series to get +- this voltage, 3S fo 12v, 7S for 24v, 14S for 48v
If you can create son kind of charger that get the current from solar charge controler and charges individually 3, 7 or 14 packs of course you got it, but all this system is more expensive than the BMS you will save.
Regards
If you can create son kind of charger that get the current from solar charge controler and charges individually 3, 7 or 14 packs of course you got it, but all this system is more expensive than the BMS you will save.
Regards
jesusangel
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Scepterr said:
The-J-Man said:jesusangel said:
correction, 7s for 24v, 14s for 48v and 28s for 96v.
Correct, seems like I forgot to multiply
3.7*n
Regards
Korishan
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I think it might have been missed. Scepterr asked about charging a pack instead of a bank.
Here's a quick understanding:
* String - The smallest collection of cells, usually in series, but can be in parallel as well.
* Pack - A complete independent set of cells with busbar connections to connect to the other packs
- A Pack can be 1 complete String, as well.
~ Having all cells connected in series and including busbar connections
~ Having all cells connected in parallel and including busbar connections
* Bank - Several Packs connected to build a Bank. This can be either in series or parallel.
- Series: the Packs are built for capacity and connected in parallel. The max number of Packs in a Series Bank is determined by the Inverter/Charger Voltage rating
- Parallel: the Packs are built for voltage and connected mostly in series. Theoretically there is no max to the number of Packs in a Parallel connected Bank
** These are the descriptions that I have gathered over the course of reading this forum and watching the videos. There can be some variations of these descriptions, but I think these are the most likely consensus of the majority of users who are building their setups.
Series Setup:
- 3s/4s = 11.1V/14.8V (12V Nominal)
- 7s/8s = 25.9V/29.6V (24V Nominal)
- 14s/15s = 51.8V/55.5V (48V Nominal)
- 27s/28s/29s = 99.9V/103.6V/107.3V (96V Nominal)
* Try to built series on the higher cell count to get better capacity and cell longevity. Ie: 8s instead of 7s; 15s instead of 14s
So, to the question of charging a Pack. Most people don't charge a Pack by itself unless something has gone nuts with the balance charging and trying to get things back to normal or a new Pack has been built and getting it ready to go into the Bank. In both cases the Pack is not connected to the Bank. Or, the Pack is for an individual purpose (eBike/etc)
Normally when the Packs are installed in the Bank, they are all charged at the same time. A BMS could potentially charge one Pack slightly more or less than another to maintain balance, but they are still being charged together.
I hope this has answered Scepterrs question; and that String/Pack/Bank has been a bit more clarified (or maybe clear as mud )
Here's a quick understanding:
* String - The smallest collection of cells, usually in series, but can be in parallel as well.
* Pack - A complete independent set of cells with busbar connections to connect to the other packs
- A Pack can be 1 complete String, as well.
~ Having all cells connected in series and including busbar connections
~ Having all cells connected in parallel and including busbar connections
* Bank - Several Packs connected to build a Bank. This can be either in series or parallel.
- Series: the Packs are built for capacity and connected in parallel. The max number of Packs in a Series Bank is determined by the Inverter/Charger Voltage rating
- Parallel: the Packs are built for voltage and connected mostly in series. Theoretically there is no max to the number of Packs in a Parallel connected Bank
** These are the descriptions that I have gathered over the course of reading this forum and watching the videos. There can be some variations of these descriptions, but I think these are the most likely consensus of the majority of users who are building their setups.
Series Setup:
- 3s/4s = 11.1V/14.8V (12V Nominal)
- 7s/8s = 25.9V/29.6V (24V Nominal)
- 14s/15s = 51.8V/55.5V (48V Nominal)
- 27s/28s/29s = 99.9V/103.6V/107.3V (96V Nominal)
* Try to built series on the higher cell count to get better capacity and cell longevity. Ie: 8s instead of 7s; 15s instead of 14s
So, to the question of charging a Pack. Most people don't charge a Pack by itself unless something has gone nuts with the balance charging and trying to get things back to normal or a new Pack has been built and getting it ready to go into the Bank. In both cases the Pack is not connected to the Bank. Or, the Pack is for an individual purpose (eBike/etc)
Normally when the Packs are installed in the Bank, they are all charged at the same time. A BMS could potentially charge one Pack slightly more or less than another to maintain balance, but they are still being charged together.
I hope this has answered Scepterrs question; and that String/Pack/Bank has been a bit more clarified (or maybe clear as mud
)
Scepterr
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Each of my packs is parallel and each pack is connected in series to make bank. My only question is has anybody considered putting an independent 4.2V charger on each parallel pack. The reason I'm asking is I'm trying to replicate the proper charging curve, which from what I've seen doesn't happen on anything charging the whole bank
J-Man All the LG cells have tested 21xx-222x
J-Man All the LG cells have tested 21xx-222x
jesusangel
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As I told before solar chargers are for 12, 24, 48v, so to considere to install 7 chargers instead of 1, the first thing is I think there is no one in the market called solar 3.7v charger, why? The price multiply by 3, 7, 14.
I think you can use a DC-DC converter, buck converter, step-down converter, whatever, but it will be very inefficient because of converting from 30 v at least from panels to max 4.2 at battery.
Any one with more electronic skills can explain a litle more?
Regards
I think you can use a DC-DC converter, buck converter, step-down converter, whatever, but it will be very inefficient because of converting from 30 v at least from panels to max 4.2 at battery.
Any one with more electronic skills can explain a litle more?
Regards
jesusangel
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You ask if anyone has considered, and I think no one as me, by the cost and by the inefficiency, maybe you will get a perfect charge curve but at what cost in $ and in % of energy loss.
Regards
Regards
Scepterr
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How about a scenario where your energy generation cost is 0 and you generate more than you can use and store in a day. So if I wanted to cycle daily, I want to do it in the healthiest way possible for the cells. I understand that's not a typical scenario and a scenario that goes away if you increase storage capacity. But in that specific scenario I think pack charging vs bank charging would prolong the life of the cells.
jesusangel
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With with real solar system this won't happen, charging a bank or a sole pack your charging curve at CC fase won't be constant current, the current from panels always varies, only if you have many more Amps from panels than the max allowed by the charger.
Almost every solar system have less W from panels than the max recommended charging current of batteries, so probably you will always be charging at max current provided by panels, and this wont be constant at all.
Of course you can make any assumptions you want, any scenario, what if ..? And with the correct assumtions you will get a yes as answer, you can get a perfect charge curve of packs, and if there is no other restriction, I agree that is better charge a sole pack than charge a bank and control it only balancing at top.
Regards
Almost every solar system have less W from panels than the max recommended charging current of batteries, so probably you will always be charging at max current provided by panels, and this wont be constant at all.
Of course you can make any assumptions you want, any scenario, what if ..? And with the correct assumtions you will get a yes as answer, you can get a perfect charge curve of packs, and if there is no other restriction, I agree that is better charge a sole pack than charge a bank and control it only balancing at top.
Regards