How do panels degrade from an electrical standpoint (volts vs amps)?

I have some very old 240watt panels that seem to max out at 200watts due do expected degradation. During a recent power outage I considered putting them in a 2p2s config to charge my power station. This puts me just over the power stations Isc rating (15.8/14A) and just about perfect for Voc (61.3/75V). I understand the overcurrent isn’t an issue. What I am curious about is if degradation shows up as less amps, less volts, or a little of each when supplying something like an inverter that doesn’t limit the panels output current?