Search found 1785 matches

by flippy
Feb 25 2021 2:49pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

You conveniently ignore the PSU-charger differences I originally wrote would prevent a house fire if you took even a cursory look at what i wrote or took the time to find a external source you would understand that it does not matter in the slightest what label has been put on the energy source. do...
by flippy
Feb 25 2021 6:13am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

you claim is that floating AT ANY voltage is bad. clearly that seems not to be the case now. You're delusional -- I never claimed this. yes you did. paraphrasing: you clearly stated that "according to the datasheets" you should terminate the charge with a charger or it kills the cell. oth...
by flippy
Feb 25 2021 6:05am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

fatty wrote:
Feb 25 2021 6:00am
This is known to be less harmful than constantly topping off the cells to 4.2V. What is the question here?
you claim is that floating AT ANY voltage is bad. clearly that seems not to be the case now.
by flippy
Feb 25 2021 5:57am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

In the context of this discussion (charger cutoff @ XmA vs. leaving a charger connected at CV for Y hours, for example overnight), you're wrong. I'm sure you will agree that connecting 2 equal cells in parallel is not harmful to cycling longevity, right? If you connect a cell @ 4.2V to a charger (v...
by flippy
Feb 25 2021 5:29am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

i see that you can read, you just have trouble understanding. the first page on the datasheet tells you a standard for the official rating that they give. its what you need to do to get the rated lifespan or capacity. you are totalyl free to change these specifications to suit your case. so you can ...
by flippy
Feb 25 2021 5:04am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

As above, any decent charger would detect the battery as overdischarged and not initiate charging. its the job of the bms to stop power flow when something is wrong, not the charger. and no commercially sold power supply for anything more then hobbyist batteries actually acts like that. and how wil...
by flippy
Feb 25 2021 4:34am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

I know most true chargers for lithium in the hobby sphere use an endAmps spec proportional to how much current the battery pulls in the early CC / Bulk stage. There are many 12/24V chargers for House banks use, and inverter/chargers, that combine with coulomb counting BM's to let you specify a fixe...
by flippy
Feb 24 2021 9:07pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

added bonus lesson: the datasheets of cells do NOT say what current the charging should be terminated. it only tells you on what current they tested the cells at to make the datasheet. it does not say ANYWHERE on the datasheet you should stop charging as well at that point. they just mention their ...
by flippy
Feb 24 2021 8:13pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

right, time for a little lesson in battery charging basics. that is more helpful then you guys trying to be highschool bullies to the guy with glasses that actually studied for this crap. a few basics: a battery is electrically just a resistor. just like a capacitor or anything that can store a char...
by flippy
Feb 24 2021 7:21pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

A proper charge source of whatever type - mains AC, solar, DCDC actually STOPS charging once its algorithm decides the battery is Full. Nothing to do with stupid blinky lights! hardly any charger on the market actually does that so its a moot argument. and lithium chargers have no "algorithm&q...
by flippy
Feb 24 2021 6:20pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

I'm very, very certain you didn't. If this doesn't illustrate it, I don't think anything will: psu vs charger.png Obviously, I've truncated the decreasing PSU current at nominal pack voltage for clarity. This place is unreal. ah, there lies the problem. you have seen a pretty picture but have no cl...
by flippy
Feb 24 2021 5:04pm
Forum: Battery Technology
Topic: Choosing correct BMS for 36v Dewalt battery rebuild
Replies: 5
Views: 89

Re: Choosing correct BMS for 36v Dewalt battery rebuild

dont use a bms for the load. just run it straight of the cells. just mount a balance board inside. getting anything beyond the original board inside the thing will be very hard,
by flippy
Feb 24 2021 4:54pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

How do you have 2000 posts and not know this? From this very thread, if you cared to read it: now explain what a "psu" like a meanwell ELG/HLG does different then a charger. and i know it. you dont. i actually went to school for this shit. you didnt. i just want you to learn you something...
by flippy
Feb 24 2021 4:49pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

And you apparently don't understand how bulk charging with a manually-adjustable voltage output can result in individual cell overcharge. Yes, you can charge like this, but it is a fail-deadly approach when a mistake/accident happens. You're assuming everyone is using a matched pack with functional...
by flippy
Feb 24 2021 4:44pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

No, it's exactly the charging curve and charge termination "features" that differentiate a charger from a PSU. No, the charger refusing to charge again after overdischarge is likewise another feature that differentiates a charger from a PSU, because the damaged battery shouldn't just be b...
by flippy
Feb 24 2021 4:39pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

The sealed Meanwells would be great if you either like flippy don't care about overcharging (not voltage necessarily, just for too long) or are OK with a CC-only profile and know how to create an HVC circuit to enable automated charge termination Oh, and figure out the issues around hooking them up...
by flippy
Feb 24 2021 10:19am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

waterproof charger - that is weird. so 220V plug and waterproof? yes, the ELG and HLG from meanwell are IP67, so they are tested to at least 30 minutes at 1 meter underwater. they are meant for outdoor use strapped to the outside of a building for 20 years. so, dunking them in a puddle will no du m...
by flippy
Feb 24 2021 7:59am
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

Why would you even need more then 1kW of charging at home? I dont think many people have 10kWh or bigger on their bikes or scooters. If you want to be sure you can bolt 2 meanwell 480W ELG or HLG to the vehicle to keep under 10 amps from the wall any they are capable of being dunked in water if you ...
by flippy
Feb 22 2021 5:19pm
Forum: Battery Technology
Topic: 'on board' 1.5kW charger. Which alibaba supplier?
Replies: 101
Views: 2048

Re: 'on board' 1.5kW charger. Which alibaba supplier?

Do you have a 30A 240V circuit available in your house/garage? why would you need that? 1.8kW is not even touching 8 amps at 240V so a nema 15 would be WAY sufficient. completly unrelated note: american 110v system is stupid. basically ever house in europe has 240V 3 phase (3x 80A rating are possib...
by flippy
Feb 22 2021 3:41pm
Forum: Battery Technology
Topic: First Battery Build 21700 Molicel P42A
Replies: 28
Views: 864

Re: First Battery Build 21700 Molicel P42A

How do people get their cells to the same voltage for the first time? you dont. you pull them out of the box. measure them and put them in the pack. and a shorting "oopsie" during the build is just as bad full as it is half full when you get them out the box. you will still frock up the a...
by flippy
Feb 22 2021 9:46am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 193065

Re: kWeld - "Next level" DIY battery spot welder

Hi yaw I just placed an order for the K-weld from Frank on the 12th and can’t wait to get it! Like a kid waiting on Christmas About how long does it take to a package from Germany to the US? I opted for the 2nd option that gives your package the Air ride vs the water ride but just curious how the C...
by flippy
Feb 21 2021 12:24pm
Forum: Battery Technology
Topic: How does low batter voltage cutoff work? 48v to ??-cutoff
Replies: 11
Views: 250

Re: How does low batter voltage cutoff work? 48v to ??-cutoff

why do all that work when you can just limit the trottle input? that has EXACTLY the same effect.
by flippy
Feb 20 2021 11:56am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1288
Views: 193065

Re: kWeld - "Next level" DIY battery spot welder

in NO WAY the bond wire "tric" should be used or copied by DIY people thinking its "the best solution because tesla uses it". the reason is because tesla uses bond wires is simply because its the fastest and cheapest way to connect a thousands of cells per hour on a single proce...
by flippy
Feb 19 2021 3:58pm
Forum: Battery Technology
Topic: First Battery Build 21700 Molicel P42A
Replies: 28
Views: 864

Re: First Battery Build 21700 Molicel P42A

continue the series connections as if you were to connect another row of cells but double the length + 1cm. then fold them back over and weld the folded back strip on top of the cells. you now have a nice loop. put the wire you want to use in the loop and use some piers to push the strip closed so t...
by flippy
Feb 18 2021 5:08pm
Forum: Battery Technology
Topic: Battery design advice required
Replies: 19
Views: 518

Re: Battery design advice required

just put the parralel strip OVER the existing series strips That's exactly what I've been trying to avoid with both the X and U patterns. I've been experimenting with my spot welder on some dead cells, and I've found that nickel-on-nickel welds are very weak. The same settings that can form a stron...