as I said above, currently the max load would be running the landing gear up and down, which is a 20a max circuit. Down the road, eventually a 3000w inverter. Max charging current would be 20a (2 10a solar in parallel). So, does it make sense to plan for the down the road eventuality or get a bms that covers the max of the current system.The bms should be sized to handle the current of the loads and the charge sources.
Usually your maximum load current will be larger than the current of your charge sources.
This is usually the inverter.
What is your maximum continuous load current in amps?
And what is your maximum charge current in amps?