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Depends how you use it.
Are you just powering your mount?
Do you need usb power ports?
Running cameras? Cooled?
Laptop?
How portable does it need to be.?
All these considerations need to be taken into account before you do anything really.
A good battery will be 250 depending on capacity.
12v usb hub bout 50
How do u want to charge?
From mains?
Battery charger say 100
From solar?
Regulator. 50-100
Panel 100-150.
Add another 50-100 for switches, wiring etc.
Alternatively, an extension cord from your nearest power point, a power board and just use plug packs from your gear.
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