I'm not super familiar with the ins and outs of SolarEdge power optimizers, but from what I've heard there are a number of them that only work properly with SE inverters and require an additional device to be unlocked for use with non-SE inverters. If that's the case, you won't be able to wire them directly to the 18kPV. The transmitter built in works on SunSpec protocol, for RSD systems such as APSmart and Tigo, I believe SE may be some proprietary communication.
You could AC couple like Quattro mentioned, but if you're wanting to be able to dark start dead batteries without grid power then having at least some DC coupled solar is helpful. Depends on how long you plan on keeping your existing solar before upgrading.