You say the AA checked the 12V battery and found no faults - do you know if they just measured the open-circuit voltage or did they use some load test equipment on it (hopefully, the latter). If so, I'd say its unlikely to be the 12V battery, from the symptoms you've described. Having said...
The solution that I and others (e.g. @johnb80) have detailed on other threads - assuming you have standard low-voltage (nominal 48V) system is to charge / top up your home storage batteries via an adjustable telecoms-type power supply from V2L output of the MG. e.g. as discussed in the thread...
Technically as in physically possible, with enough room before wall edge, or electrically as in VoC won't exceed inverter input limit with another panel in series? Presumably it was decided that 2 x 9 was not feasible in the first place, otherwise the original installers would have done that...
Have you thought about more panels, rather than more battery? Panels are so cheap in comparison and IMHO would be a better use of all that money wasted in the bank earning little interest. The net effect is a better proposition IME. You can generate more, especially on dull overcast days...
I have a few :) Here's my 2p worth...
As much as one always wants as much battery as possible and no-doubt, like me, you hate occasionally running out of charge before the next cheap rate, it's a law of diminishing returns. The issue for you, IMHO, is that you are somewhat tied into a...
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