Search found 864 matches

by john61ct
Jul 21 2019 3:50pm
Forum: Battery Technology
Topic: how to seal the positive "Y" end of a diy batt
Replies: 8
Views: 194

Re: how to y the positive end of a diy batt

when i asked the contructor of the controller im buying if it was waterprof he said yes the controller is but the wires are not... does anyone know what it means? Are you sure you're not trolling? Nothing is "waterproof", an impossible ideal. These are the common standards for approaching it https:...
by john61ct
Jul 21 2019 3:44pm
Forum: Battery Technology
Topic: how to seal the positive "Y" end of a diy batt
Replies: 8
Views: 194

Re: how to seal the positive "Y" end of a diy batt

Not how I'd do it, but for a temporary fix in an emergency, this stuff 3M Scotch Rubber Mastic Tape 2228 https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Scotch-Rubber-Mastic-Tape-2228/?N=5002385+3294317059&rt=rud is pretty good. plenty of NO-OX-ID first https://www.sanchem.com/electrical-co...
by john61ct
Jul 21 2019 1:39pm
Forum: Battery Technology
Topic: Difference between "Current Source", limiting, OC protection
Replies: 15
Views: 288

Re: Difference between

Vicor AppNote
Constant Current Control for DC-DC Converters
http://www.vicorpower.com/documents/app ... urrent.pdf
by john61ct
Jul 21 2019 10:40am
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

I'd bet IRL with a genuine disability, enforcement would be lenient.

And if not a judge would be.

But that's just my opinion and IANAL
by john61ct
Jul 21 2019 3:10am
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

I am not **at all** saying ADA would allow for faster or more dangerour behaviour.

Just a waiver of a stupid no-throttle PAS-only rule, for those who can't stand up on their pedal.
by john61ct
Jul 21 2019 12:45am
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

And in that scenario, those local / state laws are overridden by fed ADA anyway see OPDMD "any mobility device powered by batteries, fuel, or other engines… that is used by individuals with mobility disabilities for the purpose of locomotion, including golf cars, electronic personal assistance mobil...
by john61ct
Jul 20 2019 11:50pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 228
Views: 45091

Re: Building battery from MAKITA Konion PACK

Well for me, I toss a batt that's lost 20% of its original capacity anyway. . .
by john61ct
Jul 20 2019 10:05pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 228
Views: 45091

Re: Building battery from MAKITA Konion PACK

After charging is finished if you really did charge to Full take the "surface charge" voltage off, maybe .5% of SoC and/or let them sit isolated for a few hours. That voltage is then your benchmark point to investigate self-discharge rate. The voltage just after charging is not stable, will fall ove...
by john61ct
Jul 20 2019 10:01pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 228
Views: 45091

Re: Building battery from MAKITA Konion PACK


want to build wrote:now i understant the second statement is less important that resistance and year of manufacture.
Capacity matching IMO is #1
by john61ct
Jul 20 2019 9:52pm
Forum: Battery Technology
Topic: amunition case fire case bags
Replies: 5
Views: 96

Re: amunition case fire case bags

I haven't heard anyone say the incremental improvement would make things safe enough to charge inside the house.
by john61ct
Jul 20 2019 9:44pm
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

Does putting a CA in the mix give finer control over how PAS works, or let you set up a "stealth throttle" of some kind?
by john61ct
Jul 20 2019 7:44pm
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

Yes a battery isolate switch seems obvious, never built any electric system over AA size without one.
by john61ct
Jul 20 2019 5:09pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 228
Views: 45091

Re: Building battery from MAKITA Konion PACK

You keep talking about voltages matching. Voltage is a temporary passing attribute, says little about the cell itself. The thing about voltage matching is just for at the time you connect them, so the "natural equalizing" flow from higher to lower doesn't shock you, melt your connectors etc. Yes wit...
by john61ct
Jul 20 2019 2:28pm
Forum: Battery Technology
Topic: Help me choose the right learning path to building my own Battery Management System
Replies: 4
Views: 122

Re: Help me choose the right learning path to building my own Battery Management System

I am assuming the point is a fun entry into learning electronics.

If the goal is just to get BMS functionality, then yes, purchasing OTS components is infinitely more practical.
by john61ct
Jul 20 2019 2:21pm
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

Is there a centralized compendium of limit rules?

Hopefully worldwide and ideally accepting various geolocation codes. . .
by john61ct
Jul 20 2019 10:47am
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 38
Views: 578

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

The fundamental flaw, from which all such silliness flows, is that legislation is driven primarily by the interests of industry and secondarily the bureaucracies.

What would be in the interests of the general public is often given lip service only.
by john61ct
Jul 20 2019 10:41am
Forum: Battery Technology
Topic: Help me choose the right learning path to building my own Battery Management System
Replies: 4
Views: 122

Re: Help me choose the right learning path to building my own Battery Management System

Well looking at the existing related Open Hardware / FOSS projects out there would certainly be a part of it, the goal being reverse-engineering their design process, figuring out why **those** components were selected. Or a shortcut being to start with one and "fork" it to meet your needs. Personal...
by john61ct
Jul 20 2019 10:32am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 564
Views: 49324

Re: Nucular electronics - complete kit for ev! [beta]


ElectricGod wrote:I use a silicon conformal from MG Chemicals. It holds up pretty well.
Link please?

by john61ct
Jul 20 2019 10:25am
Forum: Battery Technology
Topic: Battery box that doesn't trap heat
Replies: 16
Views: 322

Re: Battery box that doesn't trap heat

Rather than the heroic efforts required to actively cool cells budget being constrained seems to me being "more realistic" about performance is what's required. Yes there is a limit to the energy density Ah capacity we want to carry around but increasing that's the easiest way to keep the C-rate dow...
by john61ct
Jul 19 2019 1:17pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 564
Views: 49324

Re: Nucular electronics - complete kit for ev! [beta]

Yes I'd be **very** interested in finding potting compounds with strong thermal conductivity and anti-shock/vibration properties, that are also easily removable.

Likely a unicorn hunt. . .
by john61ct
Jul 19 2019 1:12pm
Forum: Battery Technology
Topic: 3rd pack for ebike with different cells - wich are better
Replies: 12
Views: 222

Re: 3rd pack for ebike with different cells - wich are better

Yes, going to a lower C-rate and lowering DoD% discharge, will both help pack longevity **a lot**. One way to accomplish both is expanding pack Ah capacity, rather than going to higher voltage. This also allows stop-charging at say 4.05-4.08Vpc only sacrifices a little usable Ah capacity but also ad...
by john61ct
Jul 19 2019 12:39pm
Forum: E-Bike Technical
Topic: 60 volt vs 72 volt
Replies: 19
Views: 353

Re: 60 volt vs 72 volt

Satiator 72V model starts at minimum 20V, so 4S for most LI chemistries, 5S for LFP.

max is 103V

48V version is 12 - 63V

Both are 0-360 watts, so their rated amps max only applies when volts are lower.
by john61ct
Jul 19 2019 1:43am
Forum: E-Bike General Discussion
Topic: cyclone controller help- 3 speed wiring
Replies: 13
Views: 296

Re: cyclone controller help- 3 speed wiring

and some fresh squeezed orange juice with my breakfast, chop chop
by john61ct
Jul 18 2019 6:03pm
Forum: Battery Technology
Topic: PC charging app?
Replies: 18
Views: 442

Re: PC charging app?

Here's a short thread shows some of the interaction between voltages, charger types, available power etc

viewtopic.php?t=101364