Search found 18 matches

by gothicsurf
Nov 14 2020 1:04pm
Forum: Battery Technology
Topic: balancing after spot welding
Replies: 1
Views: 113

balancing after spot welding

My first plunge into battery construction prior to taking on a project building an ebike pack. Recently I replaced the 18650 cells in four dewalt 20v li-ion packs. Trouble is I forgot to balance the cells before connecting them in series and realized this when the voltage indicator on one of the pac...
by gothicsurf
Sep 08 2020 4:41pm
Forum: E-Bike General Discussion
Topic: torque sensing controller
Replies: 0
Views: 128

torque sensing controller

Are there any controllers available for a hub motor conversion that can use a torque sensing throttle input signal?

Reason being is the goal of eliminating the use of a display and forgoing any on-the-fly adjustment of settings.
by gothicsurf
Sep 08 2020 4:33pm
Forum: Battery Technology
Topic: 48V charger for 52V battery
Replies: 5
Views: 600

Re: 48V charger for 52V battery

Charging a 52V battery to 54.6V (as per a 48V charger) rather than the full 58.8V seems like a way of capping the charge at ~90%. A basic 48V charger seems like an easy/inexpensive way to prolong the life of a 14S pack's life .. https://www.youtube.com/watch?v=ViORzKrOfHU Getting at the pot of a cha...
by gothicsurf
Sep 08 2020 2:25pm
Forum: Battery Technology
Topic: 48V charger for 52V battery
Replies: 5
Views: 600

48V charger for 52V battery

Has anyone gotten into having a designated under-powered charger for a corresponding battery? For example, instead of a more sophisticated charger, having a 48V charger with a 52V battery as a matter of course. The way I look at it rather than opt to charge a battery to 100% occasionally, it would s...
by gothicsurf
Aug 31 2020 9:47pm
Forum: Battery Technology
Topic: spot welder mod
Replies: 2
Views: 240

spot welder mod

An interesting video [https://www.youtube.com/watch?v=J2noz_7PGsA] showing a handheld spot welder upgrade and the process leading to the end result. For me it begs the question of whether this can be done using a basic machine without handheld ports such as Sunkko 737 [https://www.ebay.com/itm/11438...
by gothicsurf
Aug 22 2020 11:07pm
Forum: E-Bike General Discussion
Topic: benefits of a programmable controller
Replies: 1
Views: 189

benefits of a programmable controller

Still in the throes of research leading to my first ebike build, and thinking I've got most details sorted except still a bit unclear on the controller. I would like a bike that can be minimal in the area of componentry that would either need to be removed or secured for urban street parking. The co...
by gothicsurf
Aug 12 2020 11:12pm
Forum: E-Bike General Discussion
Topic: torque sensing kits
Replies: 14
Views: 621

torque sensing kits

Are there any hub motor kits available with true torque sensing (not PAS) from anyone except Grin?
by gothicsurf
Aug 12 2020 12:54am
Forum: E-Bike General Discussion
Topic: pedelec conversion with torque sensor
Replies: 4
Views: 336

pedelec conversion with torque sensor

With a 'ready to ride' ebike conversion from Grin, what is the best setup for a pedelec with a focus on being discrete and easily secured? Essentially I am using a classic road/touring commuter bike with a 250-300w bafang hub motor for modest assist to comfortably haul a 60lb trailer. Plan is to fin...
by gothicsurf
Aug 10 2020 12:20pm
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

Re: downsides to a higher voltage

so basically a wash running this motor at modest speeds -- really no difference between a 36V and 52V system running on a pack of identical Wh?

Would a higher voltage be more useful in a dual motor system even if both also modest 250-300w bafang motors?
by gothicsurf
Aug 09 2020 11:52pm
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

Re: downsides to a higher voltage

would the higher voltage pack actually provide 50% more range as shown in your simulation?
by gothicsurf
Aug 09 2020 5:59pm
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

Re: downsides to a higher voltage

Maybe there is someone familiar with this simulator who can help explain why the temperatures are so vastly different at the same speed. Is it because the data was gathered for the motor at an unloaded state and therefore the rpm that is most efficient. Thereby looking at the values of the curve wit...
by gothicsurf
Aug 09 2020 3:44pm
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

Re: downsides to a higher voltage

Also, if raising voltage means the motor’s attainable speed range falls into a less efficient part of the motor’s efficiency curve, then a larger proportion of battery energy will be converted to heat rather than motive power. Though this scenario involves capping the speed/power to lets say 20 mph...
by gothicsurf
Aug 09 2020 11:44am
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

Re: downsides to a higher voltage

In trying to discern downsides to a higher voltage, what I gather is that a 52v system may be less efficient at let's say a power output attaining 20 mph compared to a 36v system limited to the same power. This being the case, the 36v system may actually attain slightly higher speeds at the same pow...
by gothicsurf
Aug 08 2020 11:45pm
Forum: Battery Technology
Topic: downsides to a higher voltage
Replies: 17
Views: 486

downsides to a higher voltage

I would like to know if there are any downsides to having a higher voltage battery pack for run a relatively small motor (Bafang MG310). Would the higher voltage and thereby lower current help maintain cooler temperatures considering a CA would maintain the same wattage irregardless of voltage? Emba...
by gothicsurf
Oct 09 2018 11:45pm
Forum: E-Bike Build Threads / Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 342
Views: 60400

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

a disparity in temperatures as in the case of an overheating motor and passing air of ambient temperature, a peltier will generate electrical polarity: seebeck effect.
by gothicsurf
Oct 08 2018 11:27pm
Forum: E-Bike Build Threads / Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 342
Views: 60400

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

Would the use of peltiers in this case be of benefit? The cool side on the elements that need cooling, the warm side mounted with heat sinks and exposed to the passing air.
by gothicsurf
May 25 2018 11:04pm
Forum: E-Bike General Discussion
Topic: electric road bike conversion
Replies: 7
Views: 846

Re: electric road bike conversion

I should have mentioned that I am trying to build a vehicle reminiscent of those used in the Sun Trip ride with a couple solar panels stacked on the trailer. I have a dog and would like to have the ability to travel while having a space for the animal under the solar panels. I have a stout frame wit...
by gothicsurf
May 23 2018 1:55pm
Forum: E-Bike General Discussion
Topic: electric road bike conversion
Replies: 7
Views: 846

electric road bike conversion

My goal is a road bike electric conversion and after saturation by readings, I figure upon a post asking for advice on this build. From what I can find, there do not seem to be many examples of classic road bike electric conversions and would be interested in any (juicy) threads or (clear) guides of...