Search found 268 matches

by BVH
Dec 09 2018 12:47pm
Forum: Battery Technology
Topic: Resting voltage for LifePo4
Replies: 11
Views: 237

Re: Resting voltage for LifePo4

LiFeP04 chemistry cells always settle somewhere in the 3.4x range. They never maintain the charge termination Voltage. I have Zippy LiFeP04 packs, PWN Real Force brand, 100 Ah packs, Thunderpower 100 Ah packs, numerous brands of E-bike packs and have had other brands. They all settle to 3.4x no matt...
by BVH
Dec 04 2018 7:11pm
Forum: Battery Technology
Topic: E-Bike Battery Pack for Camping Power?
Replies: 5
Views: 210

Re: E-Bike Battery Pack for Camping Power?

24 Volt input full sine wave inverters often have a 23-32 VDC input range. I have a Samlex 1500 Watt Full Sine Wave with the input range of 21.4 to 33 VDC. I feed it with a 9-cell LiFeP04 pack.
by BVH
Nov 11 2018 12:17pm
Forum: Battery Technology
Topic: I’M NOT Spot Welding Using Lipo
Replies: 17
Views: 833

Re: Spot Welding Using Lipo

Just in case you've not seen the Kweld unit thread. Top notch device for a couple hundred bucks.

https://www.endless-sphere.com/forums/v ... ilit=kweld
by BVH
Nov 11 2018 11:52am
Forum: Battery Technology
Topic: Best Value for Money Battery Tab Spot Welder on the Market!!
Replies: 3
Views: 396

Re: Best Value for Money Battery Tab Spot Welder on the Market!!

I second the Kweld. Have had mine for a month and results are excellent and consistent.

Kweld thread:

https://www.endless-sphere.com/forums/v ... ilit=kweld
by BVH
Oct 16 2018 7:19pm
Forum: Battery Technology
Topic: Fireproof charging bags
Replies: 5
Views: 246

Re: Fireproof charging bags

This is the only brand (the original inventor) that actually contains the fire and doesn't disintegrate. None contain the smoke.
liposack.com

More expensive than the rest but in this case, you get what you pay for.
by BVH
Oct 06 2018 4:36pm
Forum: Battery Technology
Topic: The Cycle Satiator, universal charger for the enthusiasts
Replies: 713
Views: 102625

Re: The Cycle Satiator, universal charger for the enthusiasts

I should have added that I, too, charge at only about 225 Watts/4 Amps and still like using the fan.
by BVH
Oct 06 2018 12:37pm
Forum: Battery Technology
Topic: The Cycle Satiator, universal charger for the enthusiasts
Replies: 713
Views: 102625

Re: The Cycle Satiator, universal charger for the enthusiasts

Not a technical answer to your question but... I raise my Satiator a half inch off the surface to expose most of the bottom and then run a 4" fan full-time over the top and bottom surfaces whenever I use mine. Makes a huge difference in case outer temp. It seems to me that all the internals will las...
by BVH
Sep 22 2018 10:55am
Forum: E-Bike Technical
Topic: 2WD trike pulling left when accelerating
Replies: 201
Views: 3606

Re: 2WD trike pulling left when accelerating

A compromise would be the use of LiFeP04 Prismatic Bricks. A tiny bit heavier than hobby Lipo but much lighter than SLA, discharge to 80%, no self-discharge, safer than hobby Lipo.
by BVH
Sep 17 2018 9:01pm
Forum: E-Bike Technical
Topic: Mxus 5k turbo hub motor.
Replies: 14
Views: 562

Re: Mxus 5k turbo hub motor.

.......................... So next job is to maybe countersink the holes on the rotor and replace the button heads with countersunk Allen bolts! This I certainly becoming a challenge to build this bike!! :D Rotors are very thin to begin with. Removing thickness around the mounting holes will certai...
by BVH
Sep 12 2018 3:45pm
Forum: E-Bike Technical
Topic: What would happen if batteries with a voltage difference of 0.1v are paralleled?
Replies: 10
Views: 447

Re: What would happen if batteries with a voltage difference of 0.1v are paralleled?

When you connect two in parallel, the higher one will try to charge the lower one. It's going to depend on the voltage of the lowest battery as well as the relative voltage difference. As a battery gets closer to full charge, it will want less current, and the current it wants will depend on how ma...
by BVH
Sep 07 2018 10:27am
Forum: E-Bike Technical
Topic: What would happen if batteries with a voltage difference of 0.1v are paralleled?
Replies: 10
Views: 447

Re: What would happen if batteries with a voltage difference of 0.1v are paralleled?

With my 2 Paralleled 52 Volt, 12 ah packs, I regularly charge them separately, then let them sit a few hours and by that time, they are between .1 and .2 Volts apart. I have had no issues connecting them at this point for the past 4 years. No special wires, just turn the ignition switch of each pack...
by BVH
Sep 03 2018 6:02pm
Forum: Battery Technology
Topic: Suggest uses for Toyota hybrid battery packs?
Replies: 8
Views: 331

Re: Suggest uses for Toyota hybrid battery packs?

Different battery pack but the same idea...I have a 28.8 Nominal, 150 Ah LiFeP04 pack feeding a 1500 Watt, full sine wave, max 34 input Volts Samlex inverter to power my frige and many other items in the house during infrequent power outages. It so wonderful not to have to listen to a generator. My ...
by BVH
Aug 27 2018 4:17pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 471
Views: 58367

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

Placed a pre-order. Excited about receiving it.
by BVH
Aug 26 2018 10:24pm
Forum: E-Bike Technical
Topic: 2WD trike pulling left when accelerating
Replies: 201
Views: 3606

Re: 2WD trike pulling left when accelerating

I have nothing to do with this type of build but I followed it with interest. It's a great documentation of the development of your diagnostic skills, your perseverance and ultimate overcoming of a very significant problem! Congrats!
by BVH
Aug 18 2018 6:21pm
Forum: E-Bike General Discussion
Topic: CA3 LiFePO4 state of charge
Replies: 16
Views: 316

Re: CA3 LiFePO4 state of charge

The CA3 wants pack Ah input during initial setup. Isn't this data also used in computing and displaying SOC? My fuel gauge/battery icon is always very close to actual state of charge based on CA monitored and displayed AH usage as compared to my total pack Ah input number during setup. I always use ...
by BVH
Aug 14 2018 10:00pm
Forum: Battery Technology
Topic: Sorensen DCS Series - Modification and Repair Thread
Replies: 128
Views: 2635

Re: Sorensen DCS Series - Modification and Repair Thread

Maybe some "E" Trivia. IIRC, I read or was told by an Ametek tech that the "E" Series units came about out of a need to meet E.U. standards.
by BVH
Aug 14 2018 5:54pm
Forum: Battery Technology
Topic: Sorensen DCS Series - Modification and Repair Thread
Replies: 128
Views: 2635

Re: Sorensen DCS Series - Modification and Repair Thread

Now that I think about it, I think I was advised to use a TVS in an email reply from one of the manufacturers (now Ametek) company techs.
by BVH
Aug 13 2018 12:09pm
Forum: Battery Technology
Topic: LiFePO4 High Capacity Cell Charging
Replies: 8
Views: 311

Re: LiFePO4 High Capacity Cell Charging

Why not make up a balance harness for your 4S pack and use a small capacity RC balance charger to balance charge when you need to. That's what I do with my 9S/100 Ah LiFeP04 prismatic pack I use for similar uses as you do. If you have a DC power supply, your choice of low-cost chargers is quite wide...
by BVH
Aug 13 2018 11:45am
Forum: Battery Technology
Topic: Sorensen DCS Series - Modification and Repair Thread
Replies: 128
Views: 2635

Re: Sorensen DCS Series - Modification and Repair Thread

I bought an American Rotary 10,000 Watt capacity (depending on type of load, the rating is de-rated) motor generator unit that creates the 3rd leg. By "nothing over 120 Volts" I meant I never bought any other high voltage DC output supplies. I think I had one with a DC output of 120 volts, give or t...
by BVH
Aug 12 2018 6:17pm
Forum: Battery Technology
Topic: Sorensen DCS Series - Modification and Repair Thread
Replies: 128
Views: 2635

Re: Sorensen DCS Series - Modification and Repair Thread

WOW! Just found this thread. You're a man after my own heart - or whatever that saying is. In 2015 and 2016, I scoured Ebay in search of both DCS and DLM Sorensens - Not working/for parts. In the end, I acquired 50 supplies covering DCS 1,000 and 3,000 Watt units as well as the DLM 3,000 and 4,000 W...
by BVH
Jul 25 2018 9:23pm
Forum: E-Bike Technical
Topic: Spacing a brake rotor out 15mm?
Replies: 2
Views: 153

Re: Spacing a brake rotor out 15mm?

I actually found a commercially available, specialty 15mm Alum spacer with the proper bore and Stainless bolts.
by BVH
Jul 25 2018 6:11pm
Forum: E-Bike Technical
Topic: Spacing a brake rotor out 15mm?
Replies: 2
Views: 153

Spacing a brake rotor out 15mm?

I want to retrofit my fat tire, 175mm dropouts ebike from a Bafang rear geared hub motor to a direct drive higher power motor for a bunch of reasons. I bought a 175mm dropout spec motor that fits the bill perfectly on the 7-speed cassette side but because it is thinner overall, the 6-bolt brake roto...
by BVH
May 31 2018 5:52pm
Forum: E-Bike Technical
Topic: batteries in parallel and battery in a backpack options...
Replies: 16
Views: 586

Re: batteries in parallel and battery in a backpack options...

If both your batteries are already switched, then you're good to go in that respect. .3 Volts difference is just a number that I use as a maximum. The higher the difference, the more high current flow there will be between batteries when you connect them via the switches. arcing within the switch wi...
by BVH
May 27 2018 3:35pm
Forum: E-Bike Technical
Topic: batteries in parallel and battery in a backpack options...
Replies: 16
Views: 586

Re: batteries in parallel and battery in a backpack options...

Just to be clear and that I'm interpreting your post correctly: You said: I live in Spain, so I will find a way to get the toggle switch with 48v specifications-with 30amps output-so as you say upto 50amps potential. The "up to 50 Amps potential" would be only if you are using a 30 Amp switch on eac...
by BVH
May 25 2018 11:14pm
Forum: E-Bike Technical
Topic: batteries in parallel and battery in a backpack options...
Replies: 16
Views: 586

Re: batteries in parallel and battery in a backpack options...

Could be tricky finding key switches that will handle 50 Volts and 30-50 Amps. It might be easier to use toggle switches rated for 48 VDC and current. I'm assuming you want a switch for each pack. If this is the case and you will always run the batts in parallel then 30 Amp switches are probably goo...