Lithium Batteries - The voltage isn't what you think
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- čas přidán 24. 06. 2023
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FANTASTIC info for those of us who have no idea how e-bike batteries work !!! Love these kinda videos keep em coming .
full charge is 54.6 volts, because at 48v battery is 13 cells in series, and each cell at full charge is 4.2 volts, so 13x4.2 = 54.6 volts
zero charge is 39 volts, because zero charge for each cell is 3 volts, and 13x3 = 39 volts
Thanks for the info. I’ll stay tuned for a part 2
You can plug your battery charger into a Kill-o-watt meter (or similar wall plug power meter) to see how much power when into your battery, minus a little off the top for charging inefficiencies.
The inefficiency is probably larger than you would think. The reason larger chargers have built in fans is they generate a lot of heat. That's because the efficiency is not as great as you might think. Maybe 80-85% average.
I tried that when I first got my E bike and didn't understands why I wasn't getting a reading. I'll give it a try again. I road around the subdivision one night mainly on the battery and the LCD gauge showed 3/4 charge when I got home. The next time I was out I peddled lightly and it was still at full charge when I got home. So, the distance you can ride increases greatly if you peddle a little.I could feel the motor kick in when I peddled. I am a 79 year old senior and re-learnig how to ride, just like my kids when they got their first bikes.These batteries sure are different from what I learned at my electronics school so I enjoyed your video.
@@user-dq4ws9bb2x You should not re-learn how to ride a bike on an ebike, especially not an advanced age. While you never forget the basics of staying upright in a straight line, it takes a while to regain skill.
Really good explanation
There should be as much attention to ebike seat. Having a on demand swivel lumber would be nice. Butt support is everything. That chair is king❗️I know your making fun of the storage but storage is everything to keep things looking not messy. Thanks for the battery details. I bought my first ebike in 2018 and still learning. Your the only one who takes it to another level 👍
Very well done video…
The first time I had to do these calculations was in setting up my solar panels. My battery pack has a charge limit of 1600 watts and 150 volts. My solar panels were rated at 200 watts and 36 max volts. So I had to set up the panels in a 4s/2p configuration. Eight total panels, two sets (parallel) of 4 (series).
Charging a super capacitor or high discharge rate battery to recapture the test discharge might be useful.
I like it
Ok, I'm looking for the links you mentioned for the components you used in the video... could you please post? Thanks 😊
My Nakto Discovery Premium has a 48v battery. When it's fully charged the voltage 54ish volts.
I've got a question about the BMS. How can it maintain cell balance between each cell if some of them are connected in series?
That does depend on the BMS. Some only balance groups of cells, some are capable of monitoring individual cells. Measuring the internal resistance and matching cells before assembly will help so groups stay closed together.
A b.m.s. balances by bleeding off energy to a resistor. An active balancer operates by transferring energy between the cells, to a higher cell voltage to a lower cell voltage. That's the two methods of keeping cells wired in series from going into an over voltage condition.
Do you have a schematic for the battery discharge device?
@5:35 I think you're wrong there. Lithium Polymer batteries are NOT the same as Lithium Ion batteries. Their chemistry is rather different, as well as their electrical characteristics and physical ones (weight, number of cycles, output power curve, etc).
I think the most important difference is how safe they are. Lithium Polymer are the most likely to catch fire, Lithium Ion is in the middle, and Lithium Iron Phosphate at the least likely to catch fire. Another important difference is energy density (Watt per kilogram). Lithium Ion is the best, Lithium Polymer are really, and Lithium Iron Phosphate are the heaviest. There are many other differences which should be considered when choosing a chemistry for a given application.
@@bitogre
I guess you meant "Lithium Polymer are heavy" and not "are really" ? Anyway, I agree with you 100%.
@@AlainHubert Yes, that was not well written and should have been "Lithium Polymer are in the middle" or maybe "Lithium Polymer are a relatively close second"
I enjoyed the information on the battery tester, could you put in the comments the information/purchasing price of the resistors you are using, I happen to have everything else. Thanks, great video!
This is the model I'm using. You could use one at 10 ohms and a lower power draw. www.digikey.com/en/products/detail/te-connectivity-passive-product/TE1000B10RJ/2367691?Resistors&Dynamic%20Search_EN_Product&Resistors&gclid=CjwKCAjwitShBhA6EiwAq3RqA5wO3pt6P7NntsUXKOuuVInDrTg3qyzOvqNctEr3EennXtve45ZDmhoCZD4QAvD_BwE
Kyle, can you provide the sources for all the parts you used to build your battery discharge rig. I would like to build one to discharge my battery to safe long term storage voltage.
Hi I bought your 35AMp controller upgrade for my rad power is there a way to make the throttle more responsive. Thx
How many Ohms are those resistors and what is the power rating?
Is there a way for mere mortals to measure the internal resistance of an ebike battery?
Also...maybe you could show how to upgrade a 48 Volt system to a 72 Volt system. Thanks!
Do you have a solar charging video?
Can you put a generator on a ebike ?
I ride a Hesa Trigo delta recumbent trike but I would like to ride to the grocery store but to get there I have to ride a a highway do you think I might need a different bike?
Depends on how wide the shoulder is. No reason you can if there's enough room. If your left tire hangs over the white line perhaps not a good idea.
It's just like a 12v lead acid battery up to 13v at full charge.
A lot of information
i got both right ,. because i run a 48v battery in my setup lol
why not use a 72v battery to power a lower watt motor 750w for example to get a very long range and ride time ?
It still takes a certain number of watts to move a bike, the voltage alone won't make it more efficient.
Power for any electrical device is determined by three factors. Amperage, Resistance and Voltage. Yes, you can increase the voltage of the battery. But that by itself doesn’t necessarily give you more capacity. Calculating your potential Watt-hours of the battery is more effective strategy to increase range than jacking up voltage.
My scooter sometimes stop & sometimes run..what is the problems!🔝
55.6v is my mx03 but 54v
My 48 v charges to 54.6m, which is closer to 55 than 54.
I rounded off, but yes 54.6 would be correct.
i got both right but i have electric scooter with volt meter and its has 48v battery so its was too easy
I just tested my 48 volt, freshly charged li battery and it's reading 55.1
A touch high, but voltmeters can be off a little too.
4.50 volts ( Jabba the Gut ) on a single cell without wanting to chuck up, so , i suck at math. So yeah 4.50 on single cell pushing to max, or get a fire bucket with sand And a 4th of july tune, i prefer 1812 overture atm, BTW i a'm not an Expert and neither was Chris Whitty,Matt Haddock, or tommy vallance, benny calm down it's 18650 ....This message will....know the rest
That stuff was so simple I almost fell asleep
Glad you already have it figured out. Most do not and I have questions about it often
39v
12
52
C 54
It is absolutely wrong and downright stupid to say voltage is speed and amperage is range. This is about as wrong as it is possible to be. What moves you down the road is WATTS and your range is watt hours.
Assuming you were willing to give up efficiency, you could wire them entirely in parallel and raise the voltage in the controller. Efficiency is why they are not wired like that. Increasing DC voltage is not especially efficient (though it is very efficient to boost or drop AC voltage).
Higher voltage allows for much thinner wires.