well over half of the ebike models runs on 13s, that’s the main reason for that voltage to exist here
More and more boards are using 14s as well, and 14s is kinda hot over at the scooter land
It’ll be adjustable too. Depending on demand, there is also the possibility to add current adjustment as well as a display, but both of those would bring up the price by a lot with limited value added to solving the real issue
This project had already existed for two years, and gone through a lot of revisions. The development goal went from perfecting the product in terms of functionality to perfecting the product for the consumers. Sure we could’ve made it even smaller, at the cost of an extra 40K USD of R&D expenditure that will make the unit price even higher than it already is.
Great to see this moving forward! Your specs mention CE. Was that self-certification or was it done by a Notified Body?
Could you post your Declaration of Conformity?
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Awesome to see some evolutions in chargers! Also @haven they just forgot their silicone tube has a cap 
“That screw thing don’ work kid, gotta deplete it in one go. EY DONT THROW THAT THING IN THE PLASTIC BIN. Gosh you gotta tell them kids everything nowadays.”
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Thank you!
We have the tests done with private labs already, which brought back results that allowed us to comfortably sign the declaration of conformity. The certificate of compliance is pending atm, and depending on the necessity we will comply to do the EC attestation of conformity, which is the level that requires a notified body of EU.
We’d love to, but at the moment, the DOC is signed by our manufacturer, which means there is information on there that we are not at liberty to share publically.
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Thank you for your reply.
I am sure you share my concern and desire for safety as devices like this contain lethal voltages and formal certification before any are sold is important.
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I had a working prototype almost a year ago, if I disregarded any of the above it wouldn’t take nearly as long as it did for me to only have it announced now.
I can assure you the testing behind this charger was beyond extensive throughout the two years we worked on developing it, working with a supplier that almost exclusively dealt with laptop/phone chargers that doesn’t work in a manner alike the lithium chargers’ mode of CC/CV made us decide that going overboard with safety testing and experiment with different way of misusing the product was a must in order to push out a problem-free charger.
I agree. Although I can’t understand why a lot of existing brands fail to deliver this simple yet crucial procedure, we certainly will not.
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It’s heavier (and likely a bit larger), weighing 2.5kg, but Trampa has a 12s 12A fanless charger for 160$
No idea what the other specs are because Trampa’s website is still garbage
Here’s the specifications for the trampa charger, only difference is the plug
The volume of their charger is 2.48L, only a bit over 3x in size compared to ours.
Like I said, we aren’t aiming to compete with anyone, GaN technologies applied to lithium battery chargers are in a league of their own, should I also mention that the charger above probably gets made in volume of millions and our charger gets made in volume of hundreds for now, so there’s not really any advantages when it comes to economy of scale. If buying a 300W UGreen GaN charger for $269 is acceptable, consider for only $30 more you can buy our MFG, for double the power, and we definitely manufacture our charger in way lower volumes than UGreen
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USB chargers are bought by everyone. The less educated general public doesn’t realize how bad of a deal that is. People buying a DIY charger for electrical vehicles are less likely to part from their money so easily I think. Would love to be proven wrong though, because your charger is undoubtedly unique 
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Dose it have a end of charge cut off? Or will it holed the Battery at a set voltage until un plugged/relying on the BMS to terminate the charge?
Personally I don’t see a issue with a $300 charger I spend 1000s on each board and think most chargers are built to cheep with pore components. As a community it’s a after thought and low priority but involved in one of the most dangerous stages of a eboards use. Still intrested to see the output power quality on a oscilloscope how much noise is on the PWM
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That’s not what pending means. They have no ip or Ul cert yet.
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I agree with this. A lot times something will work afterward, but then to sit in a closet overnight will destroy it.
Depending on the mode selected through the switch, the charger will be loading a different onboard profile that’s dedicated for charging 12s/13s/14s. The first stage will be constant current, aka CC, where the current stays the same at 10 amps and the voltage changes with the battery. The second stage will come after reaching 85% capacity, where it switches to Constant Voltage, aka CV. At this stage, the voltage will stay at 50.4v/54.6v/58.8v, and the current will reduce as the battery equalizes its true voltage after the high current charging ends.
For each of the respective profiles, the charging voltage will not exceed the maximum of 4.25v/cell for the CC duration of the charge, and will not exceed 4.20v/cell for the CV duration of the charge.
That is one of the many challenges we’ve faced, and we’re pleased to say the noise is extremely optimized compared to other high-current chargers in our industry.
I’ve used the very same charger that I threw the submersion test with for at least 20 complete charges afterwards on different voltage settings, and no issues so far.
I might’ve gotten lucky with my one unit but I guess we’ll see after I send a dozen or so units over to get them IP tested.
Also just so this is clear, just because we’ve made these chargers more resilient doesn’t mean you should do stupid shit such as running your relatively high voltage and definitely high current skateboards’ charge port with a fast charger submerged in water. Last time I checked water and electronics still don’t play well with each other…
Adding on to this, it probably goes without saying, but water damage = no warranty. Sorry. Who knows how deep your charger is submerged underwater? If the product survives at 1m depth, but the consumer dipped it under 3m, how is the vendor supposed to obtain that information? Are we to keep some sort of depth gauge embedded with the charger as well? The same goes for purposefully throwing it in the fire or dropping it off of high places; just because we’ve made it more resilient and dummy-proof doesn’t mean it’s meant to be used that way.
more portable than what?
it’s heavier and larger than competition
why? just because of silent operation?? more efficient power delivery is the main benefit as I understand it