Rough, gross rule of thumb, most panels will provide 10A in full sun. What varies with the different size panels is their voltage. 400W panels typically run at ~45V, while 100W panels are around 12V. It varies. Put four 400W panels in series and your getting 180V, but you only have to cable for 10A. Remember 12V can actually be 11.x to 14V, with lead acid it’s 12.8. you have to look at the exact specs of each panel.
Match the charge controller to your expected voltage, then it doesn't care, as in my case, 24V @ 10A or 12V @ 20A. It’ll charge the 12V batteries @~20A/hr, full direct sunlight.
Oops, but all this is pie in the sky. PV panels rarely meet their advertised output. And they tend to loose some power after their first week in the sun. Then the charge controllers aren’t 100% efficient, and neither are the batteries nor the inverter. Then, of course, is the question of exactly how much sunlight do you get per day?
This isn’t a daily use or total off grid application, so if it takes me a week too fully charge them, that’s okay. I may use 10-15% with power tools once in a while, if that much,otherwise the cells serve to keep the batteries topped off and to qualify for the 30% tax rebate.