Les, how close to 240V are you at home? I've been surprised at how close power is generally at Astrofest, Ron's, Peter's. I like to be portable, but a good battery is so expensive you might be better off investing in a decent power supply set up first?
(probably completely off topic given the title of the thread, but hey, thought I'd throw it out there....
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Failing that, you need to look up how many amps the QHY8 and laptop are pulling and figure out max time you would want to run and calculate some amp hour figures. Just quickly:
- Laptop - 1-3 amps?
- QHY8 - 1-3 amps?
- EQ6 - pretty negligible compared to above
If you say 3amps total, and want to run max 7hrs, and never take battery below 33% charge, that would be about a 33-40Ah deep cycle battery I'd suggest. I'd be surprised if the jumpstart pack is more than 17Ah total - and its debatable how well and how many times it would be able to do that anyway. It would be fine for just the EQ6, but pushing it to run just the camera OR laptop for any period.