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A couple of things that may help you decide.
I use a Projector brand (Kmart) 12v laptop converter and have for over 12 months and it's brilliant.
You must not discharge your battery below 10.5 volts or it will kill its future performance.(this includes most SLA batteries), I say most, because there are some available that actually like to be discharged but they are WAY expensive.
Deep cycle batteries MUST be charged correctly (14.2vdc to 14.6vdc) for them to be deep cycle, if you don't then they will behave pretty much like a normal car battery.
Normal 12v inverters suck to much juice for what they put out (inefficient). Don't go down this road.
If using a generator, inverter types are way better for sensitive equipment, normal types should really be used for basic stuff like lighting as they can (and most do) have dirty power.
Only charge batteries from a generators 12vdc outlet in an emergency, the 12vdc is VERY dirty as it is normally not filtered and normally only half wave rectified. DO NOT run sensitive stuff from it.
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