The inverter is the POW-HVM6.2M-48V-N
It's a 6200W 220/230/240V single phase inverter. I attached a picture of the label to this post.
At the time failure, it was running an electric water heater, which normally uses around 4000-4500W. I think I had it set at 220V or 230V output.
I smelled smoke, so I ran into the solar system room and the inverter was spewing smoke from the fan but was still running and producing power. I had to manually shut it off with the switch on the side.
It's been running well in this setup for around 6 months. In the summer it ran my whole-house AC, and at night time I would switch off the AC breaker and put on the water heater.
The capacitor that failed is on the 48V battery side of the circuit, not on the output side. Battery voltage was probably right around 50-52V, so if the heater was taking 5000W, that would have been around 100A of current but, again, this was very typical use in my case, so it looks like random component failure.