My home has a 200amp meter box with 6 double breakers beneath the meter under a flap - 4 breakers are 60amp (stove heater, AC, unknown) - there are also 2 100amp breakers going to load centers inside - I believe the previous owner must have added a 2nd panel since they are different makes. the original box 200amp has neutral and ground connected to same bus and a green screw that appears to bond the bus to ground. the 2nd panel is 125amp. It also has neutral and grounds on the same bus but there is no green bonding screw - should there be a green screw since this is not a sub panel but appears to be a second (parallel panel) added to increase circuits. Everything seems to be working - I'm asking because we want to do solar grid tie and company says they will need an available space in the meter box and wiring looks odd. It got me looking at the set up and alos questioning??
If the second panel is fed by the first (power is fed to the second panel through a breaker in the first), and the service neutral is bonded at the first panel. Then the ground and neutral should be separate in the second panel, and separate grounding and neutral conductors should be run between the two panels.
Neutral and ground should be bonded only in your main service panel. Sounds like, in your case, that's the one attached to your meter. Secondary panels should have separate neutral and ground bus bars. Bonding ground and neutral elsewhere in your home will not appear to affect functionality, but is a safety hazard.
The reason it's a safety hazard is that you're creating multiple paths through your electrical system for current that should go entirely over neutral conductors. In this case, your ground conductors (between panels) are probably routinely carrying current. Ground conductors should only carry significant current during a fault.
This is a relatively easy fix - just add a bus bar to your second panel so you have separate neutral and ground buses. But the fact that it wasn't done this way originally likely means your wiring was done by someone not entirely clueful, and it might be good to have an expert review the whole system.