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Hi Frank
I'm not surprised, an EQ6 it quite a decent mount and will sap the power, so 18 AH is barely enough to drive that, plus if you add dew control then a laptop, it'll run down in no time as you discovered. Petrol generator - wow! that's really serious stuff and not for me.
So I guess you options are limited, you just need more AH. An 18AH SLA is about 6kg, 24AH is around 9kg and 38AH is about 14kg. I steered clear of those power tanks, I decided to go for a quality Yuasa SLA and look after it.
My power needs are much more meagre than yours, but I neatly store my 18AH in one of those very tough, but soft esky cooler packs and that makes it super portable IMHO. Do you think 38AH will do for what you need for an observing session - weight and dimensions are on the edge of portability.
Here's one idea, if you can park close to your observing site, how about leaving the 38AH battery in the boot and just running a long line (with insulated terminal ends!) to where you need it? If that idea works, then you could even go for a 65AH SLA (about 23kg) and leave that in the boot... Fox!
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