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I’d avoid mix and matching equipment, while technically it’s fine, if you ever have a problem it will become a blame game between inverter company and battery company with you lost in the middle.
Personally I would opt for option 1 with the Giv set up.
Make sure installer is MCS and check the register before you pay deposit.
Which – trusted traders, is also a good place as all reviews are verified and due diligence has been done by which.