alarming

I blipped the low voltage alarm on the MiniBMS this morning (the MiniBMS is an individual battery monitoring system. Each cell has a circuit board on it and they are all connected together to a master board that keeps track of their voltages and reports any problems). I was accelerating onto the freeway in third gear. Basically it was a full throttle 0-60 run in 3rd gear trying to get up to speed of traffic, so probably 15 seconds at least at max throttle. I heard the alarm for just a second as I approached 60mph while pulling 300a from the batteries (48x 130ah cells). According to the numbers I can find online for my tranny and final drive ratio, 60mph in third gear is 5000rpm, so it's right up there on the high end of where I should be taking the motor. Anyway, I heard the alarm beep for just a second just as I was going to make the shift to 4th gear anyway. I was showing about 130v (153v nominal system), though it's a small analog gauge and a bit hard to read while driving (+/- 10 volts would be hard to tell).

Anyway, I should be able to pull many more amps than that without this much voltage sag, not going to worry about it quite yet, but it's something to wonder about. Hopefully it's something simple like needing bigger wiring or better connections in the battery loop. I do know that right now a few of my cables are 2awg which is awfully small. They should all be 2/0, and will be eventually once I decide exactly how I want all the batteries laid out and tied down.