Hmmmm... not sure what about the main pump would have tripped the breaker other than it was not up to the task at hand. You may need a more powerful main pump. Btw, the "battery backup" only powers a secondary, less powerful pump. Your main pump cannot be sustained for any length of time on battery, so when the mains power goes, your primary pump stops working regardless. For that, you need a generator.
Glad the insurance company came through though.