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John,
For me at both home and on the field, I use a 350W computer PSU to convert 240V to a stable 25A 12V DC. You can use devoted "Din Rail PSU's", but they are much more expensive. On the field, this is by a 2000W generator as apposed to a wall outlet at home. From there, the 12V goes into a little box that gives me both dew heater control and a few "cigarette" sockets and USB charger for phones and tablets. I have also rigged in a voltmeter for a 9ah battery that only gives me about 4hrs when running my AZ-EQ6 without a generator.
For me, it suits as my generator is quiet and only takes about 0.4L of fuel for about 15hrs. It also (obviously) powers my laptop and any other device I throw at it. It has also lasted me 15 years so far, so I can not complain about longevity.
Joel
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