Search found 1585 matches

by flippy
Jan 23 2020 11:12am
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 163
Views: 20965

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

would a 2 pin connector connected at the contactor coil positive or negative be a option? a simple jumper bridge can be made if you dont need it or you can have a remote hard emergency cut by physically cutting the power to the contactor. that way you can break the contactor with external control or...
by flippy
Jan 22 2020 5:20am
Forum: Battery Technology
Topic: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.
Replies: 39
Views: 609

Re: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.

Punx0r wrote:
Jan 22 2020 4:53am
If you're doing it "properly" why not just get a proper loadbank? https://crestchicloadbanks.com/dc-direc ... loadbanks/
i did look at them a while back, no thank you. their pricing is built on goverment contracts. their devices are seriously overpriced for what they are.
by flippy
Jan 22 2020 2:20am
Forum: Battery Technology
Topic: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.
Replies: 39
Views: 609

Re: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.

personally i dont like a single setup with a huge range. accuracy and just general clumsyness of using a huge box to discharge a single 18650 cell is dumb. i have thankfully been able to spend company money on test gear and have learned the "right tool for the job" after much fails. semi-pro setup: ...
by flippy
Jan 20 2020 1:31pm
Forum: Battery Technology
Topic: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.
Replies: 39
Views: 609

Re: Help me build a quality, datalogging, charging/discharge bank @ home, DIY.

you need to give us more. right now you are sounding like "i need a new laptop, which one should i get?" and expecting us to magically know what you want to do exactly.
by flippy
Jan 19 2020 2:21pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1027
Views: 129734

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

ElectricGod wrote:
Jan 19 2020 11:25am
There is a minimum voltage where weld quality gets pretty poor.
i start noticing a reduction at 7.5V, do you experience the same?
by flippy
Jan 19 2020 3:23am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1027
Views: 129734

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

i wonder, has anyone tested that uses a kcap noticed how low they can go on the voltage before noticing a drop in weld quality?
by flippy
Jan 16 2020 12:53pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1027
Views: 129734

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

i would love to see someone put a manual switch on a kcap. :lol: Just wanted to mention, there is nickel and there is nickel plated steel (Hilumin). The latter welds much easier because of the higher electrical resistance of steel. Many sellers try to sell Hilumin as pure nickel (guess where they ar...
by flippy
Jan 08 2020 3:42pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1027
Views: 129734

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

if those tips are plain copper then they wont last long, you need the fancy stuff from germany in order to have lasting tips.
by flippy
Jan 03 2020 5:24am
Forum: Battery Technology
Topic: ENNOID-BMS for 48V to 400V lithium-ion battery pack
Replies: 163
Views: 20965

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

very nice. just noticed 1 tiny thing: the micro usb. that connector is is only one that is to the side, i would recommend changing it to a type B vertical connector. its much more durable for EV use and then you can even dunk the board in coating or a closed bottom housing as all the connctors are a...
by flippy
Jan 02 2020 7:22am
Forum: Battery Technology
Topic: Battery jungle, Lipo, 18650 or 21700 help please.
Replies: 39
Views: 1925

Re: Battery jungle, Lipo, 18650 or 21700 help please.

trust, me if there is a cost effective non-welding solution that can deliver the same reliablitty and power density i am all over it. sadly there is none. Wander what you mean cost effective? Building with mine will cost less than buying, say Grin pre-made packs but then you need to assemble it you...
by flippy
Dec 31 2019 4:06am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Chopper Project
Replies: 19
Views: 1823

Re: Electric Chopper Project

local steel supplier will have the right size box steel.
make the weld bead intermittent and allow it to cool after each weld, otherwise the frame will warp like a pretzel.

or get a local welding shop and ask them what it costs to slap rhe mod.
by flippy
Dec 27 2019 5:28am
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

There may be an oddball exception but I've never heard an anecdote of "it turned but voltage was too low to attempt to fire". cars with stop-start features run into this problem. they have high rpm starters that will run at lower voltages. mercedes had a infamous run with their first gen stop-start...
by flippy
Dec 26 2019 4:55pm
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

i think we can both agree that almost nobody -not even mechanics- are spending 500+ on a ammeter unless you are doing specialized stuff. that is well outside the range of what any consumer would spend and also not even many regular elechickens would buy. prehaps my whole point about testing methods ...
by flippy
Dec 26 2019 2:22pm
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

I have never seen an ECU fail to operate at any voltage where the starter is capable of turning the engine, no matter how slowly. So unless manufacturers have dropped their design standards considerably in the last few years, you can assume most ECUs can cope with wide voltage transients. read Bosc...
by flippy
Dec 26 2019 4:28am
Forum: Battery Technology
Topic: low temp error on my BMS
Replies: 32
Views: 1856

Re: Ca analyst throttle

mark 324 wrote:
Dec 25 2019 4:45pm
Hi I installed to ca analyst throttle domino in screen show is working but wheel not spinning any know why?thx
this is like asking " my car is not starting, why is it not starting?"

why are you looking at a CA when you have other issues to work out first?
by flippy
Dec 26 2019 4:10am
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

But 11V +/- 1V error (prrsumed due to low time refreshing rate of voltmeter) seem good enough to give me a sense that this is still not at the end of its life. that approach does not work in many modern cars. they simply refuse to work under 10V. older cars (specifically the ECU) usually craps out ...
by flippy
Dec 25 2019 6:39pm
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

its very hard to test actual cranking. the industry uses 100A for 30 seconds for this reason as this can be done with a basic tool. due to the longer load you can compensate for the higher peaks in most situations. specialized SLA shops will usually have nicer toys that will go deep into the nitty g...
by flippy
Dec 25 2019 4:51pm
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

measure for 30 seconds under load if you want to do a fair test. most starter motors are rated at about 1kW. so roughy 100A. but the first turn will be a basic dead short, so that first second is usually well above the 250A mark and once the engine speeds up the current will drop and depending on th...
by flippy
Dec 22 2019 8:00pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 228
Views: 20272

Re: Li-ion cells cycle ageing

The 1A rate is fine, but to be more fair, what about using 0.5C for comparability across a wide range of cell capacity sizes? so larger cells aren't artificially rewarded and smaller capacity models aren't penalized I´ve been trying to choose such testing parameters that are close to real ebike con...
by flippy
Dec 18 2019 6:15pm
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

it not a fair comparison between the alternator and the charger, both do the same thing but you cant beat the SLA chemistry and it simply takes many hours to charge it, just running the car a few minutes does nothing for actual float charge and storing energy in the part of the battery that holds th...
by flippy
Dec 18 2019 9:54am
Forum: Battery Technology
Topic: Meanwell clone- AD488.3-400W power supply mods
Replies: 130
Views: 16516

Re: Meanwell clone- AD488.3-400W power supply mods

the NTC is to prevent massive inrush currents that destroy the contact area of whatever you are using it power it (a plug or switch) and the prevent the RCD from popping. not using them will degrade wall sockets and after repeated use it will cause wonky sockets that will burn houses down. the reaso...
by flippy
Dec 18 2019 8:49am
Forum: Battery Technology
Topic: Meanwell clone- AD488.3-400W power supply mods
Replies: 130
Views: 16516

Re: Meanwell clone- AD488.3-400W power supply mods

NTC rating is very important. wrong rating and it will either simply not work or burn up lots of power.
by flippy
Dec 18 2019 12:56am
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 182
Views: 33444

Re: Fuse-wire for individual cells, DIY Tesla style

if you have a decent bms they are EXTREMELY unlikely to fail Links to examples of models you consider that reliable would be appreciated for most people here a tiny would be sufficient: https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36 just remember cables are sold separate wich is ...
by flippy
Dec 18 2019 12:55am
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 1796

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

charge it to full and keep the negative battery terminal disconnected until you want to use the car.