Search found 366 matches

by Jon NCal
Nov 03 2015 10:39am
Forum: E-Bike General Discussion
Topic: Advice wanted for choosing a kit
Replies: 5
Views: 401

Re: Advice wanted for choosing a kit

Just to note, if your motor is 20mph top speed, it won't be giving any useful power when you are pedaling 22-23mph. So best to get 24-25mph motor @ your chosen battery voltage.
by Jon NCal
Nov 02 2015 2:15pm
Forum: E-Bike General Discussion
Topic: help with diagnosing problem
Replies: 2
Views: 390

Re: help with diagnosing problem

I had a similar problem due to a low cell in the battery causing the BMS in the battery to shut down. If you can check your individual cell voltages with a volt meter that would help determine if you have one or more lower voltage cells. If you can do it after it cuts out it might give more useful d...
by Jon NCal
Oct 29 2015 12:29am
Forum: Battery Technology
Topic: Faulty Lithium Ion Water Bottle Style Battery 48v13ah
Replies: 6
Views: 544

Re: Faulty Lithium Ion Water Bottle Style Battery 48v13ah

No need to remove any cells! The icharger will come with alligator clips and you can charge each individual paralleled cell group separately to 4.2V. For example, 5 cells tied together to one form one parallel group, just clip on to the plus and minus sides of that group.
by Jon NCal
Oct 28 2015 10:56am
Forum: Battery Technology
Topic: Faulty Lithium Ion Water Bottle Style Battery 48v13ah
Replies: 6
Views: 544

Re: Faulty Lithium Ion Water Bottle Style Battery 48v13ah

You can get an RC charger like an icharger that can charge up various numbers of cells (or individually) to whatever voltage you need. Perhaps look in the classifieds.

Some people have adapted a cell phone charger to charge the individual cell groups.
by Jon NCal
Oct 26 2015 12:02pm
Forum: Battery Technology
Topic: Lead Acid to Lithium
Replies: 12
Views: 993

Re: Lead Acid to Lithium

Lead is often rated at C/20, or 20 hour rate, but you can look up the discharge rating/tables/graph for your battery to make sure. So if the 100Ah rating is 20 hour and you are using it up in 8 hours, you may only be using 30 or 40 Ah because of lower actual capacity at higher rate of use. Therefor...
by Jon NCal
Oct 26 2015 10:04am
Forum: Battery Technology
Topic: Lead Acid to Lithium
Replies: 12
Views: 993

Re: Lead Acid to Lithium

Lead is often rated at C/20, or 20 hour rate, but you can look up the discharge rating/tables/graph for your battery to make sure. So if the 100Ah rating is 20 hour and you are using it up in 8 hours, you may only be using 30 or 40 Ah because of lower actual capacity at higher rate of use. Therefore...
by Jon NCal
Oct 25 2015 8:53pm
Forum: Battery Technology
Topic: 4 new sla batteries w/open cells
Replies: 4
Views: 804

Re: 4 new sla batteries w/open cells

Hard to know what happened. Sounds like the battery was over-discharged somehow. The battery also may have had some small load on it from controller just sitting for a month without the charger connected?

If controller has LVC of 42V, should have protected on initial trip...
by Jon NCal
Oct 24 2015 11:21am
Forum: Battery Technology
Topic: Does anyone have experience with BatteryMinders Chargers?
Replies: 28
Views: 1653

Re: Does anyone have experience with BatteryMinders Chargers

Lead is fine for this type of application. As stated keep fully charged and don't drain it too deep, but also don't leave it on the charger indefinitely as that can overcharge the battery if the charger does not drop down in voltage to storage level (float charge). If left discharged for a length of...
by Jon NCal
Oct 20 2015 7:35pm
Forum: Battery Technology
Topic: Advice required for battery+ accessories suit BBS02 48v 750w
Replies: 6
Views: 533

Re: Advice required for battery+ accessories suit BBS02 48v

For reliability and safety of charging, I would skip the lipos and get a high quality pack based on Samsung or Panasonic 18650 cells such as provided by em3ev.com. Either a the dolphin pack which mounts in the triangle if it fits your frame, or small triangle pack which fits in the triangle bag. You...
by Jon NCal
Oct 06 2015 11:54am
Forum: Battery Technology
Topic: Modify charger lead acid batteries.
Replies: 5
Views: 892

Re: Modify charger lead acid batteries.

4 or 5 batteries in your scooter?
by Jon NCal
Oct 03 2015 11:31pm
Forum: Battery Technology
Topic: Lead Acid Woes - Sulfation, Inefficiency, etc.
Replies: 20
Views: 4669

Re: Lead Acid Woes - Sulfation, Inefficiency, etc.

Also, best for longevity to fully charge and then kept on "float" charge in a temperature controlled environment. Is about 2.25vpc at 68 deg. F, but can vary with particular lead acid type and storage temp.
by Jon NCal
Oct 03 2015 4:34pm
Forum: Battery Technology
Topic: Big lead acid single cell capacities
Replies: 9
Views: 874

Re: Big lead acid single cell capacities

I once worked with a telephone tech that had some keys dangling from his belt. He was a bit alarmed when he leaned over the battery and his pants caught on fire.

I think the C5 capacity means 5 hour rate. Could use electric heaters to test?
by Jon NCal
Oct 03 2015 2:04pm
Forum: Battery Technology
Topic: Big lead acid single cell capacities
Replies: 9
Views: 874

Re: Big reaction lead acid single cell capacities

Positive plate capacity probably means 80ah per positive plate and can infer your model has 8 plates. Check the voltages and acid/water levels. You might want to add distilled water and charge and do a capacity test. Looking at the photo of the batteries, it is a bit unsafe to have all the connector...
by Jon NCal
Sep 09 2015 9:49am
Forum: E-Bike Technical
Topic: Xiongda 2-speed motor
Replies: 149
Views: 27896

Re: Xiongda 2-speed motor

I was thinking of getting the model with the manual H/A/L switch, or is it better to get the one with switching through the screen?
by Jon NCal
Sep 07 2015 9:28am
Forum: E-Bike General Discussion
Topic: HELP with Serial and Parallel LIPO setup- what went wrong
Replies: 22
Views: 1500

Re: HELP with Serial and Parallel LIPO setup- what went wron

Perhaps use a voltmeter to check for voltage as you do the connections. Since you have dual connectors, you would need a jumper to connect one side, ie plus or minus, and use the voltmeter on the other side.
by Jon NCal
Sep 04 2015 9:57pm
Forum: E-Bike Build Threads / Photos & Video
Topic: My Merlin Mac10T CAV3 build.
Replies: 10
Views: 1748

Re: My Merlin Mac10T CAV3 build.

Nice bike! Any problem with getting the axle/nut fully into the dropouts?

Jon