The included shunt is good for 500 Amps. There is a 1000 Amp shunt which we have listed in the store.
(Victron Energy 1000 Amp 50 mV shunt for use with BMV Meters)
There is also a 2000 Amp shunt which we can special order for you, and there is even a 6000 Amp shunt available that takes a bit more time to special order. The larger shunts require you to program the meter to recognize them. They dont come with a circuit board, you have to repurpose the one that came with the original shunt.