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I have to say this, but why is this question asked so often? IMHO the only situation that warrants a 240v power adaptor is in an observatory wired to the mains. I use the field source (battery) in my backyard all the time. In fact the telescope fans have been on the battery for the past two hours right now. I will be outside soon observing for a few hours, the battery will power the scope + heaters+ argo etc. In the morning I will put the battery back on the charger. I have a 240V source (came with the scope) but to use it would mean running an extension lead out on the wet grass - no thanks.
Anyway - it is nice and clear outside and I'm off outside.
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