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Inverter, Main DB & Sub DB for essentials

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Hi all and thanks for your help.

This is what I have:

1. Mains DB with own Earth leakage, sub-db with earth leakage for essentials & inverter. 

2. Where does the AC INPUT to my inverter come from to charge? Can I just take it from the bottom of the main DB Isolator directly to the DB Incoming AC or how would you do it? I was thinking of "charging" the batteries from a CB in the main DB.

3. The sub DB will be wired as a normal DB, with plugs on earth leakage and lights no earth leakage?

4. From what I have learned so was, the sub DB has to have two seperate neutral bars; one for circuits without earth leakage and one for circuits with earth leakage? I will appreciate it if someone can confirm this for me.

5. The "mains incoming" for this sub db wil then be the AC output of the inverter.

Thanks very much for your help.

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