Recent content by prensel

Hi, I recently have bought a non-runner Novox C50 scooter also known as the chinese brand Tisong and replaced the SLA batteries with a fresh lithium set. This scooter has a digital dash/speedometer. Unfortunally the speedo didnt/doesnt work and after looking into the wiring it appears the wire...

There could be a lot of reasons for sticking electrodes. Sticking means the electrode material is molten and has become part of the weld itself, which it isnt supposed to. Main reasons: - too little weld pressue - uneven weld pressure - contaminated electrodes - contaminated material -...

Okay i thought of that first also but i have a charger here which really sparks when connecting to a pack, regardless if its switched on or not when connecting the pack. So I think it matters on how many (empty) capacitors the charger really has for sparking or not. Just to be safe i think an...

I'm not using one of these 'chinglese' bms systems, this one is modular upto 16 modules monitoring 12 cells each (so max 192cells) and has a separate controller which communicates with the modules, display etc by using a can-bus. The pack is not permanent installed/connected into the ev/bike but...

And here's another change for my smartswitch concept.. I've split the control signals for the load/controller part and for the charger part of the switch. My bms controller provides two separate signals: LVC and HVC. I want to control when current is allowed to flow into the pack (charging) and...

Ok ,changed the schematic on this one, tested it and it works. The +12V and GND which drive the FET gates come from an isolated dc-dc converter connected to the pack by a small on-off switch. This +12V is actually fed into an AVR controller which controls the CAN-BUS BMS and triggers the FETS on...

I'd like to add back-to-back mosfet(s) to prevent any current in and out of the pack (for example when driving or charging). Can i simply add the additional fets to the source from the other fets and connect the pack to the 'lower' drain and the load/motor/charger to the upper drain ?

I'm using this technique to create heavier busbars for my >100Amps packs. By using multiple .2x12mm or 0.2*15mm strips combined into a 1.0*12 or 1.2*15mm busbar. Since i can weld upto 2000Amps i guess using 0.3 strips would be possible also but havent tried that yet.

Ah ok I see what you mean. It's good to know that someone is looking close :-) At the video i'm using the old electrodes made of solid copper with a 2mm tip and the gap was set a bit (1mm) too far apart. I'm now using GlidCop electrodes with a 1.5mm tip and with a 2mm gap so there's more room...

Hi there, Where did you see that ? There's no spot missed on the welding apart from the one already done :-) The sparks you see just means that the APC (Automatic Part Conditioning ) of the MacGregor welder is triggering. This APC is an extra control just before every weld is made to see of...

Here's my auto-welder for my custom-made battery packs :-) https://youtu.be/bzinNslIhmU

I have design here of a spot welder made of 24 caps 47000uF/16V. They are grouped in 3 and triggered by two IRFB7430 FETs in parallel. All 8 groups are then connected in parallel and the MOSFETS are all triggered in parallel by just a 12V signal. Theres no timer involved just one shot until the...

I would say charge more often. You get more cycles out of lithium by not depleting it completely. Hence Tesla and alike prevent over and under charging of their li-ion cells.

Hi all, I need to use capacitors instead of a car battery for the JP welder. Reason is that i'm going to use the JP welder on a CNC based system modified for spotwelding. To prevent long cables (this system has 90cm X-travel and 40cm Y-travel) i'm going to mount the JP welder with welding tips...