Search found 1705 matches

by Voltron
Mar 26 2019 7:10am
Forum: General Discussion
Topic: AWG amp rating chart, what about voltage?
Replies: 8
Views: 144

Re: AWG amp rating chart, what about voltage?

It does affect it. But they can't know what voltage you're going to run at. The point of using the chart is you need to know your system wattage. When you know that, you divide out your personal system voltage you'll be using to get the amps that will be flowing. Then you get the wire size you need ...
by Voltron
Mar 25 2019 10:55am
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 30
Views: 487

Re: Lead acid anyone?

So much lead acid misinformation in one place! Some lead acid updates from the last decade.... While never matching lithiums power to weight, AGM (absorbed glass mat) lead acids have solved all the other complaints about lead. They can sit on a shelf for a year without self discharging or sulphating...
by Voltron
Mar 24 2019 1:30pm
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 30
Views: 487

Re: Lead acid anyone?

Yep, when you need a reliable 2400 cranking amps lead still has a place, and also as a large cruising sailboat pack where fire safety is critical and you need some ballast anyway. That a Northstar AGM... super pure lead, virtually zero self discharge, and sent in matching serial number lots for clos...
by Voltron
Mar 23 2019 11:23am
Forum: E-Bike Technical
Topic: Rear Bafang hub motor speed hack?
Replies: 8
Views: 236

Re: Rear Bafang hub motor speed hack?

Does the controller have a pair of single, usually grey, wires that plug together?
by Voltron
Mar 05 2019 9:25am
Forum: E-Bike Build Threads / Photos & Video
Topic: Another "stelth bomber" build.
Replies: 12
Views: 828

Re: Another "stelth bomber" build.

The fork steerer tube should stop about 4 or 5mm below the top of the plate if you're using direct mount stem... Not lower than the clamp bolt, but not flush with the top either.
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by Voltron
Mar 04 2019 11:53pm
Forum: E-Vehicles General Discussion
Topic: What does this charger behavior indicate?
Replies: 17
Views: 421

Re: What does this charger behavior indicate?

I ended up manually balancing the battery and the charger went back to operating normally.
by Voltron
Mar 04 2019 10:47pm
Forum: E-Vehicles General Discussion
Topic: What does this charger behavior indicate?
Replies: 17
Views: 421

Re: What does this charger behavior indicate?

On one of mine that has a cheap BMS, it doesn't seem to actually balance. Instead, when a group hits 4.18, but the total voltage is too low, it goes into that cutting the charge and flashing the green light mode. Maybe it was balancing, but so imperceptibly slowly it would have taken a week to even ...
by Voltron
Feb 26 2019 12:03pm
Forum: E-Bike General Discussion
Topic: Throttle use with trigger shifters?
Replies: 20
Views: 452

Re: Throttle use with trigger shifters?

Yes.. All the other combos either wouldn't fit past the throttle, or sat a funny distance from ones thumb. I actually end up using the front shifting with the thumb a lot with the bigger jumps between gears instead of the back, esp in city traffic, as you need to run thru the gears so fast in the ba...
by Voltron
Feb 25 2019 10:23pm
Forum: E-Bike General Discussion
Topic: BMS defect or unbalanced cells
Replies: 18
Views: 319

Re: BMS defect or unbalanced cells

Sure looks corroded on the BMS like it got some water intrusion... Esp at the corner posts.
by Voltron
Feb 25 2019 5:23pm
Forum: E-Bike General Discussion
Topic: Throttle use with trigger shifters?
Replies: 20
Views: 452

Re: Throttle use with trigger shifters?

I went thru a bunch of different setups of every type of trigger and twist grip shifter, and is really hard to get a combo that feels natural actually using all the gears.... ended up with a twist rear and thumb lever front. Works out pretty well.
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bars (800x450).jpg (178.78 KiB) Viewed 231 times
by Voltron
Feb 22 2019 2:54pm
Forum: E-Bike General Discussion
Topic: Zokes EVG ebike fix.
Replies: 3
Views: 129

Re: Zokes EVG ebike fix.

Once you're making the jump to a new battery, it's not much further of a leap to just get a modern brushless motor and controller... Those frames are great all arounders, and there's tons of cheap drive packages out there. IMG_20190222_122105.jpg Then comes getting rid of the tiny crank and putting ...
by Voltron
Feb 22 2019 2:45pm
Forum: E-Bike General Discussion
Topic: assisted tilting tadpole velomobile
Replies: 7
Views: 2175

Re: assisted tilting tadpole velomobile

Yes, it seems like the main point of the tilting would be to make the g forces on the driver less side to side in the turns.

And for the Piaggio crowd...
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1597937_728597910497892_347956893_n.jpg (49.28 KiB) Viewed 67 times
Randy_Johnson_Deco_Helmet_Decopod_HR.jpg
Randy_Johnson_Deco_Helmet_Decopod_HR.jpg (132.04 KiB) Viewed 67 times
by Voltron
Feb 16 2019 9:04pm
Forum: Battery Technology
Topic: 84V pack not reaching full charge
Replies: 14
Views: 319

Re: 84V pack not reaching full charge

Bummer! Better finding it now than later. One possibility is even though the cells could handle it, the ripping session overheated one of the strips into melting thru the wrapper and shorting to the metal can, which would explain the sparking when poking it too.
by Voltron
Feb 16 2019 8:14pm
Forum: E-Bike General Discussion
Topic: 1 big battery or 2 small ones?????
Replies: 6
Views: 252

Re: 1 big battery or 2 small ones?????

Are you going to parallel them up? That is, use them at the same time, or swapping a fresh one in?
by Voltron
Feb 16 2019 8:11pm
Forum: Battery Technology
Topic: 7s8p x2 good or no ?
Replies: 3
Views: 179

Re: 7s8p x2 good or no ?

It's totally fine... Just size the wire connecting the packs for the full load.
by Voltron
Feb 16 2019 8:08pm
Forum: Alternative Energy
Topic: Help converting an RV house battery to lithium
Replies: 11
Views: 928

Re: Help converting an RV house battery to lithium

Be thinking fire safety... If the pack is big enough to run for a good long while, it might be too big to drag away from the RV in a worst case scenario.
by Voltron
Feb 16 2019 8:04pm
Forum: Battery Technology
Topic: 84V pack not reaching full charge
Replies: 14
Views: 319

Re: 84V pack not reaching full charge

You really should be checking the individual groups as you bulk charge it, not just the total voltage. A new pack shouldn't self discharge, and if the BMS itself was unbalancing the pack while sitting around, and cutting out because it couldn't keep up with the imbalance now that it's charging, you ...
by Voltron
Feb 16 2019 11:06am
Forum: E-Vehicles General Discussion
Topic: Drivetrain selection for an electric drive system
Replies: 13
Views: 420

Re: Drivetrain selection for an electric drive system

Chain drive is actually one of the most efficient gear reduction systems, in addition to being easily regeared if you want to change ratios down the line.
by Voltron
Feb 16 2019 11:01am
Forum: E-Bike General Discussion
Topic: GM two new mid Drive Ebikes
Replies: 6
Views: 290

Re: GM two new mid Drive Ebikes

But it goes so fast (14.5 mph)! There is going to be a whole generation of this type of connected low power bike, as share bike and last mile solutions scale up. It's going to be getting harder to sell overpriced gas cars stuffed with features to keep you distracted from wondering about the system a...
by Voltron
Feb 16 2019 10:49am
Forum: E-Scooter and Motorcycle General Discussion
Topic: chinese e scooter missing battery pack
Replies: 11
Views: 383

Re: chinese e scooter missing battery pack

Re the battery size, you could go a little bigger, say 14ah, and it won't hurt anything if that's what's around. 10ah would work in a pinch, but would die really quickly anyways from the loads, separate from the charger thing.
by Voltron
Feb 14 2019 5:15pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: chinese e scooter missing battery pack
Replies: 11
Views: 383

Re: chinese e scooter missing battery pack

That looks like one of the mid size ones. Prob was 48v lead acid, but maybe 60v. You could start with 3 lead acid for 36v, and see if it runs, then try 4. Better than starting high and working down.
by Voltron
Feb 12 2019 9:16pm
Forum: E-Bike Technical
Topic: 250w to 1500w
Replies: 28
Views: 573

Re: 250w to 1500w

The 15 amps is how much you can draw from that cell without overheating, theoretically.
by Voltron
Feb 12 2019 12:11pm
Forum: E-Bike Technical
Topic: 250w to 1500w
Replies: 28
Views: 573

Re: 250w to 1500w

Just an FYI, one of my 25a labeled controllers was actually peaking at 55a during hard acceleration when I metered it. There's no way of really knowing from the label what a cheap controller actually draws .