So... Set me straight on a few things related to battery C ratings and BMS capacity... Please!

[BillCaswell]

If you are configuring the batteries in parallel like above, the full 300 amps will only be present on the bus bars between the parallel groups of cells and at the ends.

The Fortune cells are rates at 2C continuous and 6C for 10 seconds. Do I size the bus bars for maximum current?

 

[Cal]

Keep in mind that the BMS contactors should only open under load in the case of emergency battery protection. Other protective over charging and discharging measures should prevent the contactors from changing states under load ever.

That's a very dangerous mindset. Do the "other protective over charging and discharging measures" have knowledge of individual cell voltages? If not then the contactors need to activate more often than you think.

When stating the contactor will never open (or hardly ever), are you saying the contactor design doesn't need to undergo standard engineering practices? That would be extremely dangerous.

 

[Pete@SolarBatteryBarn]

The Fortune cells are rates at 2C continuous and 6C for 10 seconds. Do I size the bus bars for maximum current?

You should size the bus bars so they are protected by your fuse.
The fuse should be sized according the load requirements.
The batteries should be sized with appropriate margin.

 

[BillCaswell]

Hmm… post too fast?