Hi @ht1299
That’s an interesting choice. It is hard to tell the best move without more details of your system and roof setup. If there is a lot of shading optimisers will certainly help, although, they aren’t magic, so if the shade is too much it might not be worth getting the solar. Do you have more details (satellite images or something) of the shading situation?
Removing the old system and installing a new one seems quite drastic, although it could be worth it depending on the circumstances. What is the reason for you wanting to get more solar? Where are you based? How much electricity do you use a day on average?
See post here on Tigo and string inverters, vs Enphase.
Cheers
Marty