Redesigning the high voltage junction box for my EV-swapped BMW
Вставка
- Опубліковано 1 чер 2022
- As part of the upgrades to my electric car conversion, I want to add a second battery pack. That means adding more switches (contactors) to ensure that the high voltage cables are never live when the car is off. Plus I want to be able to connect up my new heater and the charger, and keep it all neat and tidy. So in this episode I'm redesigning my original high voltage junction box.
I'm really pleased with the result: nice and neat and it allows me to re-use the OEM connectors from my BMW hybrid battery pack. - Авто та транспорт
I earthed my power steering pump to a bolt on my front driver's side shock tower. :) . Works.
Quick questions and comments:
1. IVT-s shunts should do 5.5V-40V supply
2.Are you fusing each pack separate from the main fuse in your hv box?
3.How are you managing making sure the pack stay at the same voltage before allowing them to combine?
Good questions!
1. Really? I'm sure I took from the data sheet it needed 5 volts. But will double check - thanks.
2. Probably have a second fuse in the rear pack
3. To be confirmed. Probably some communication between BMSs.
@@EVDIY 3. I would precharge both packs onto the bus to avoid any dangers. Plus... Keep the old faithful Sbox per pack.
You are piling alot of contactors and controllers into the car any way.
@@Tom-evnut Yeah I think I'll probably shift the whole existing S-Box into the rear pack. That gives me pre-charge, fuse and shunt and keeps it all compact.
Given that I am planning 3 packs that is a great question! Hadn't thought of that apart from treating each module as an individual with SimpBMS
Another great episode! Paying attention to your HV box all ahead of me... I'm stuck in bad wiring trying to get prius power and HV ECU's adopt it's new friend openinverter.
Don't pay *too* much attention to me! Turns out the shunt can run at 12V for a start
PS - good luck!
Your junction box is much larger than mine. Mines so full you can barely close the the lid. :)
Yeah it's a beast. Makes layout a little easier though.
My setup is completely free of Canbus. You are the opposite. :)
You may well be the wiser man!
are you using separate contactors for charging ?
or do you need to enable the main contactors ?
Main contactors. Ideally via canbus but that's proved... problematic. So may set up a line from BMS to inverter to trigger start.