4s, i might have caused confusion, new at this.
No problem. The shorthand naming convention we use takes a bit to get used to.
Using two of the Overkill Solar 4s BMS you have a rated capacity of 240 amps. The numbers that smoothJoey came up with in post #8 are worst case, but useful. Using his first number of 250 amps, it's only 10 amps over what the two combined BMS are rated for. The Overkill Solar BMS has been tested to operate at that rating continuously, which is good. Even better is if you're unlikely to every really run the inverter
continuously at that rate. His second number is based on the idea that a lot of these BMS devices are crap and that the folks selling them are pulling ratings out of their butt. Hence, the ratings are overstated. However, the Overkill Solar BMS has a very good reputation and the ratings do seem to hold up under testing.
As long as you aren't abusing the inverter, your plan is OK. The 600 watts of solar will help mitigate the draw on the battery. So if you're pulling large numbers of amps when the PV is producing lots of watts, the BMS will be even less stressed. If you really wanted to hedge your bet, another four cells and another BMS would spread the load, reducing the stress.
Your system isn't that different from mine. 4s2p using Overkill Solar BMS, 640 watts of PV on the roof. Where we differ is that I also have 640 watts of PV on the ground and only a 1,000 watt inverter. I'm planning to upgrade to a larger inverter, probably 2k or 3k watts, eventually.