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G'day Brett,
If I was to ever build an obs off my beer garden, then I would not hesitate to run the 12vDC loads from a good quality AGM battery connected permanently to a multistage battery charger. A UPS ( Uninterrupted Power Supply ) if you like.
The prime reason for this is there can be no interruption to supply as you may expect and likely get direct from a 240v to 12 volt power supply.
This gives you some considerable insurance from interruption to grid supply.
Secondly, the battery ( say around 100 Amp Hour minimum) gives you the capacity to handle peak amp loads that only a very good and expensive power supply would be able to handle.
Thirdly, the charger to battery setup provides your electronics with the best possible voltage and surge protection where the battery acts as a filter.
Good quality 10 Amp battery chargers such as Xantrex, Sterling, Victron and Ctek to name a few. Expect to pay upward of $450
Good quality deep cycle AGM battery such as Remco, LifeLine, FullRiver. Expect to pay $350 to 600.
I'm with David on the Anderson style 12vDC connection and fused distribution.
However, the lower current load devices are possibly still ok with cig type connectors.
You can even consider an inverter in this system if you wish to have your poota in the same protection loop. There are combined inverter chargers such as Victron and possibly Baintech.
Best do a bit of research here though as inverters can considerably increase system sizing and cost.
Keep all this gear as close to your pillars as possible to reduce wiring cost and voltage drops. This in not necessarily the case for gear like poota's running off the 240 side of the inverter.
A battery monitoring/management system along with solar for charging is then something you can consider a little later.
I have noted your limited electronic knowledge, but if there was a willing experienced asto guru to help you get through this in Brizzy, the benefits and the leaning experience would be very rewarding.
The brands and prices suggested above are not bottom end, but neither are they any where near top end stuff.
Hope this helps.
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