Can I just replace my panels if my inverter is still good?

Yes, with a few considerations.

• If your array has been damaged by hail (and the glass need not be broken for significant damage to be done) savvy installers will be able to take a thermal image to assess the condition and you might find a new array is a worthwhile insurance claim which retains your old inverter.
  
  
• It is possible to upgrade your solar panels without replacing your inverter. However, it is usually more cost effective to replace the whole system rather than just the panels. Whyso? When you have a new inverter with a new serial number you're eligible for STC incentive payments on new panels.
  
  
• Depending on how you crumble the cookie, this effectively means that with a new system, the glass on the roof is free. Your cash is buying an inverter, installation and balance of system, but the total cost can be 30 to 50% lower if you're claiming STCs.
  
  
• A whole new system of course comes with a complete new warranty and will also eliminate any rooftop isolators, which have been a fire risk liability the industry is happy to see gone.
  
  
• Early solar systems may have panels that are not fire rated and this might be a concern if you live in a fire prone area. Anything post 2014 should be ok as AS/NZS5033 specified IEC61730-2 compliance for a Spread of Flame Test and a Burning Brand Test
• Your grid connection approval will be tied to the inverter, so improving or expanding your system without having to meet the latest network rules (export limits & internet connectivity for instance) might be a simple solution.
• If you have a battery hybrid which is integrated as part of a complex system using legacy equipment that has limited technical support, it may also be a simple matter to replace your array without having open a can of worms.

An installer will be able to assess your current system and advise on the best option for you.