…
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barely been smaller in a useable way yes technically you smaller get over it it’s not a big enough difrence you also down 20% in power
you designed this knowing what alternative on the market so let’s compare negatives
- 300% cost
- 18% less power
- 50% heavier
- 10% longer
- no charge status
Vs
- 40% depth
- Some fan noise
If your costs were the same I’d say you had a place as an option but the negatives just stack up to much as a hole package.
I recomend you look at your project and think how can you bring more to it. Make it 1/2 the size. Double the power. Add user wanted features make it a better chose for users. Or other things you can think of I dont know what else is possible. you have finalised it with out geting feed back from this forum. gotten frustrated when the comity has pointed out comparisons and disadvantages vs other products on the market.
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Fan noise sucks.
This isn’t GAN and I just posted it above but it and it’s fellow models with lower voltage seem the best power supply available:
Does any high voltage you could want
Adjustable
70$
Silent
Pretty waterproof
Downside:
Low current.
I post it because you can’t find a high voltage supply that isn’t loud breakable crap.
Here’s a small GAN that’s cheap and silent and they’ll make it in high voltage. I have two 86v going strong for a year
. But sadly low power
I never got upset when I felt challenged; I got serious when people set up unfair comparisons. One can argue for their own usage scenarios and habits, shorter length matters more than less volume/thickness, but just stating other chargers being “smaller” without adding any pre-requisites might give some other people, who do care about the volume/thickness more than length, the wrong idea about my product. I have to be the one jumping on people’s quippy comments about it being less “smaller” than the competition when it was merely the length in consideration that is the compromise, and the overall size is actually a massive decrease in size. Never got frustrated, just necessary to correct other people’s potentially misleading statements about MY product.
As answered previously, your price concerns, which numerous community leaders have addressed that it’s okay for the charger only to have CE certifications on LVD and EMC, by then vending in the US without UL is okay, are no longer a concern with us now not needing to obtain this certification. The price can be lowered straight to $200, which is the cost, when purchased with the battery pack, and I’ll only raise the standalone cost by a tiny bit for shipping and labour.
I don’t remember anyone stating it’s okay to only have CE cert. and that selling in the US would be okay without UL testing.
I spoke about CE testing going a long way but that didn’t mean nothing else was needed. You need UL testing or the ETL equivalent in my opinion.
We’re not experts on this. You must hire a consultant, to clearly describe what testing is and is not required (but might still be recommended) for the different regions you will sell in.
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Even at that I don’t personally think you product brings enough to the table for most people looking for your original objectives. I’m not saying your ripping people off I’m saying the end design has not meet your original requirements or competitive with other products out there. Iv layer it out in built point.
Normally this would be assessed at the design stage and pull the plug or change directions yes GaN has some advantages but in this package I don’t believe they have enhanced on alternatives
This is only advise take it or leave it that’s up to you it’s your project. Just be aware some company pay thousands for market research R&D to make a report to come to the same conclusion.
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Except this isn’t the normal scenario where a huge ass properly run business is making it, this is some random ass engineering student’s pain in the ass and he wanted to make the pain less of a problem for as many people as possible… As mentioned, I knew this project would not be profitable a good while back, when I had the prototype more than a year ago, and got an understanding of the cost and the difficulty (pricing) of getting the right certifications. If it as much as breaks even for the cost, I’ll be fine as this was a for-the-community project from the start. If in the long term, and by this I mean like at least 5 years or so, the cost goes down with economy of scale and it can slowly generate back the money I invested for R&D and making samples and stuff, I’d still be fine with it taking that long to recover the cost for making it. But if it doesn’t, I’m also okay with that. If I were to rely my livelihood on this project alone I wouldn’t be going through with it…
$350, much smaller than whatever the fuck this is, 100-330vac in, 16s-32s, 1500w on 110v, 3000w on 220v
2kg, comes with a carrying case and adapters for any euc you can think of.
Much smaller? Could you please check the actual dimensions and then make that statement? From the picture, that’s a Huawei 4875/4850 power supply made for servers with after-market modifications to be used as a cc/cv battery charger, the fan is loud as f and obviously being an aftermarket mod it has zero certifications, and it is definitely NOT smaller than my charger. I am well aware of how fast it charges, it is about 2 - 3 times in volume and a whole pound heavier even though it has no silicone thermal compound…
That’s a much more DIY and unsafe solution than what I’m offering, but hey if it works for you it works
And also FYI, these are sold, at an off-the-shelf prices, of around 600-1000 RMB, here in China. That’s about 90 - 130 USD. I can only imagine the material cost for them will be much cheaper, getting these for 350 even with shipping included, now that’s a price premiere I dare not to even dream about
With how little you are taking in the priceless feedback here
This is a good thing.
Maybe try this again on an ebike forum, and leave the attitude at the door.
From what weve heard here, I guarantee you’ll sell 3 or less to this forum if you don’t change paths and add features.
Best of luck!
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@Stealther please avoid using the word retarded as a pejorative around here. It’s not cool, and will get you banned.
Back on topic, two out of three dimensions are smaller, and the third dimension is larger.
One charger is a little fatter, one is a little longer.
If you put them side by side and asked me which was smaller, I’d probably tell you they look about the same size. You could advertise yours as 25% smaller and I wouldn’t disagree, but in practice the difference seems immaterial, especially when you consider how much heavier your charger is going to be.
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Link?
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ya it is
Sorry, since when can people no longer even curse at themselves?..
since always
what are some chargers/supplies for 120-126v? you know a lot about chargers and hoping you have a good lead
Im just gonna throw in my 2 cents here.
Its novel what youre trying to do, but that you’re not doing it for profit really doesnt change anything to the end user. Youre still trying to market a device on the open market, and its pretty clear you havent achieved a very successful proposal to the majority of us. No amount of “it has GAN” will change that right now.
The average user is really not going to care about the marginal difference in form factor here, the additional weight is going to annoy people, and the relatively limited featureset means it really doesnt stand out as much as you think. Sure, its a passive charger - but the vast majority of people are not going to notice the difference between passive and a set of quiet noctua fans.
To the average person in the hobby, what theyre going to see is this.
- The charger is longer, making it a more inconvenient form factor, regardless of the thickness.
- Its a slower charger than some of the other options on the market, making it worse for those who need quick charging on group rides.
- It doesnt offer much configurability. No way to fine tune final charge level, charging current.
- It costs SIGNIFICANTLY more than other options.
- It weighs more, by a significant amount.
The only benefits you have right now are that
- Its silent (which really doesnt matter versus a quiet noctua fan)
- Its volumetrically smaller (longer, meaning its less convenient)
- Its GAN (why does this matter?)
Regardless of how little profit you’re making, or how much effort you’ve thrown at it, your product is coming in at a significantly higher price, with very few benefits that would be realized by the intended market. People care about the results when buying a product, not how it was made. You need more than “its GAN!” to successfully sell a product.
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Gotta understand, this is a tough crowd. I offered a 12s charger with 80 90 100 percent charge switch, in a mini charger. Most poopooed it as they have SMART BMS and limit things there. We think different than ordinary consumers.
“Most” being a single guy that said until it exists, they can just limit in their BMS?
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The priceless feedback includes:
- Getting rid of the silicone thermal compound
- Get a fan in there instead
- It’s too expensive
- Make it thicker, not longer
- Make it able to adjust the voltage with increments of 0.1v, as well as adjust the amps with similar increments, and make it so that it could work for 6s - 20s.
Am I summarising correctly here? And if you have been reading through my counters, which I have replied with consideration, they are:
- Getting rid of the silicone compound renders the passive cooling aspect of the charger useless, which makes it thermal throttle in around 30 minutes to 1.5 hours, depending on ambient temperature, input voltage, and frequency. It will also remove water, shock, vibration, and impact resistance, and will likely increase the amount of units which requires service, services that are probably going to end up being replacements since the PCBA is extremely compact.
- Use a fan to cool instead. This is a good suggestion to back up the first, the problem is using a fan will increase the already dissatisfied extra length of the charger. The fan will also introduce unwanted noise. The fan approach was the first one we’ve tried, however, there are no fans at the size of 40*40 which is quiet enough to push the air for the cooling needed. The quiet fans people are referring to usually come at a much larger diameter, allowing it to spin slower for the same amount of airflow.
- I’m already selling at no gain, the markup was merely for getting the UL certification, if people don’t care/we don’t need UL and CE plus RoHS plus ETL is good enough, then we can work on getting the price down to a more affordable price. Selling at cost is fine for me.
- The charger is as thick as the largest component, making it thicker just creates more empty room. If you see the PCB construction you’ll know that it’s quite impossible/unreasonable to make it thicker&shorter than keeping it thinner&longer
- That’s essentially a DC power supply, normally one of those is about 10x as big for a model with the same amount of total output. Having increments of 12s/13s/14s suits more people and enables the size of the charger to remain relatively smaller than two dials, a screen, and all the extra circuitry, IC, and memory on board to achieve that feature. Maybe in a future version, but for now this is as universal as it’ll get
If you look for these answers you can find them, what I fail to see is a valid arguments made for these answers, therefore, it’s really isn’t me denying to take feedbacks, is that the feedbacks are dried up. If you worked on this project as closely as I have, you can see the number of trade-offs I took to balance the performance/features to where they are to day, in order to serve as many people as I could. But on that note, I do appreciate the feedback, even though they don’t quite apply to this project here, and it’s not anyone’s fault. I’m not denying their worth or the worth of people who invested time and knowledge to write them, I’m simply saying most of the suggestions here are already suggestions I’ve made within our team, which we collectively agreed to compromise on. I’m sorry that I made impressions like this
But it’s simply not true.
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