The advantage of version 4 over version 3 is that you now never parallel chargers. Each charger has its own little bus, and the size of that bus is determined by the plugs. In the above, you can charge with just the onboard charger, or you can charge with the onboard and two external chargers. The onboard charger charges 4 modules; the external chargers 5 each. If you added another charger, just make up another lead with 2 more plugs. Should one of those chargers fail, use the old lead.
You can also check the voltage of each module separately without opening up the vehicle, charge or discharge just one module, etc.
The disadvantage is that there is no interlock to prevent only part of the pack getting charged. I'll have a think about how this could be done.
So people don't have to refer back to the other thread, here are the previous circuits.
Version 2 (two charge buses):
Version 1 (same as V2 but no module fuses and no module boundaries:
Woody's original circuit:
48V Bus + ---O O--- + 48v block - ---O O--- - 48V Bus / \ prev 48V block ---O O-----(bypass)-------O O--- - next 48 V blockMy original response to Woody's circuit:
Comments welcome as always.
Edit: [ FONT=Courier ] doesn't preserve spaces.