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Aidan,
You have your average power usage which is useful for battery storage and replenishment rates from Solar etc
Then you have your peak loadings - eg if you have an observatory which I assume you will, and both motors operate at the same time then you can have a big power surge.
Most AC motors use about 6 times their power rating in the first few AC cycles of use to energise the windings and spin up to speed.
Most small Inverters up to 600watt may or may not handle this
We tried a number of different Inverters between 400-600w - none managed it reliably.
Motor starts can be quite unforgiving.
I'd start at 1200-1500+ watts, pure sinewave
You might also be better off getting a low power PC device that only draws around 5-12 watts when in use rather than a full PC sized computer that could be drawing 100s of watts.
The other thing is that you dont have to limit yourself to 12v DC - many of these systems can operate at 48v DC and this allows for much cheaper power cabling and typically puts you into the more commercial/industrial quality range and out of the domestic consumer end of equipment that may not have the longevity or duty cycle that you will want.
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