I want to connect a standalone quattro connected to a 500 ah power bank and solar panels to a 3 phase quattro system with 200 ah power bank. I connected the standalone to the ac input 2 of the master unit of the 3 phase system but it did not charge the battery bank. You can see the voltage and frequency on the ccgx but there is no current. How should I connect it to charge the 3 phase system battery bank?