They're stated to be weaker than imperial generators one for one. What do you think the relative strength is?
Generous estimate; 70% of imperial generator
Reserved estimate; 60% of " "
Note: In EU/Legends, the Mon Calamari installed three times as many shield generator on their ships for their size.
My headcanon was always that Mon Cal generators may be weaker, but the multiple generator banks made it harder to overwhelm the shields regardless - when one is overloaded, another takes over for it so that it can go into a recharge/cooldown cycle, and by the time this next set of generators and the set after them overload the first set is ready to be turned back on. Even if Imperial shield generators can individually take more of a beating, they lack this kind of redundancy, so once the shield generator is overwhelmed the ship is defenseless.