The unit will come with a 450W power brick (18V / 25A), but you can also operate it from a battery. The onboard ultracap charger is designed for 60 amps, and that should allow for 200 Joules per second at the output terminals. The cable losses will reduce this, but for copper one could use massive ones.windtrader said:
My intended price tag is around 1000€ for the prebuilt base unit. Power supply and output cables are extra items. I also have the idea to offer the base board for people wanting to mount their own ultracapacitors (actually kCap will also work with the new unit), but I'm not fully sure. I estimate 3 to 4 months of development work on this, mainly software and steel enclosure, but I have parts already here to build the first 100 units thereafter. These will be prototypes, and international product certification is on the list after these.windtrader said:Sounds awesome. What us the ETA for availability and estimated pricing? So many upgraded features and capabilities - going to boost the price for sure.
I was thinking that for every volt above 6.3V that my battery has, it needs to have 1 mOhm of internal resistance to stay in the current range that does not damage the kweld. For 22V-6,3V=15,7V, so 15,7 mOhm. I'm measuring 21mOhm at the kWeld input. Did it break because R is too high?
While not knowing the exact specs of that battery, I'd say that it is way too powerful for the welder. kWeld has an overcurrent protection, but when a battery is just pushing way too much then that doesn't trigger quickly enough. Important to note that the welder basically shorts out the battery into the weld spot. The Tesla pack has probably delivered many thousands of amps.
I was able to replace the broken diode and today i did a first weld. I used a different power source.
No, I tried and few and it didnt work. I also tried 4S and didnt like it. In the end I use two 3S 60-120C Turnigy "heavy duty" lipos in parallel
Yes please. That would be a great option for pouch cells.I'd love to give laser welding a go, maybe as the second next project?
Ok, thanks for the info!
My Turnigy Graphene 5.0 4S 75C lipo ripped itself apart when trying to weld a 0.15 nickel 0.20 copper sandwich.
December 31, 2022, I placed an order from HobbyKing for a couple 3S Graphene 6.0 batteries, and they’re *still* back ordered. All HobbyKing can tell me is that the manufacturer in Hong Kong is dealing with Covid restrictions and so things are delayed for an unknown period of time. So my three partially complete battery packs languish until I can power my kWeld. Ugh
Maybe if you paralleled 3 of them.
Use thick copper braid to make the connection, make sure not to touch the sixth terminal (gate). I'd also check the small resistor and diode, as they have received some heat.
Alright! Thank you for the support!
does this mean that you don't get a double beep error when you set "MinCurr" like this? That shouldnt be the case!
These Lipo chargers do not provide accurate results, and also they surely include their own lead and croco clip resistance. For an accurate result, I use my oscilloscope and a strong load. Measure batt voltage with an without load, calculate ESR from that.
