I have a 17amp projecta brand {without inverter}power tank from kmart {hmm price cant remember maybe 80-90 bucks} from real field experiance it delivers enough power for my LX200 for a night no worries . Powering a LX scope with something else from the same source is advised against in some forums , i decided not to anywhy so its your risk . I orginally got a inverter to power a laptop but was worried about power spikes ect and safety aspects and got a Kerio adaptor from Dork Smith instead , now with just running the laptop from the projecta i get roughly 2-3hrs before the recharge led comes on and thats the same with a Orion dew zapper.If you decide to run a scope and laptop i doubt you would get more then 2 hrs even if the numbers suggest otherwise .I ended up getting a second battery {35amp golf buggy battery}for the laptop and dew heaters
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