Go option 3 - take SLA batteries with you until you save up to run the power up there. Treat it like a field trip, but with comfortable chairs!
One thing I have found in the 2 years I've been doing this hobby, taking the "cheaper"/"easier" option just means you have to do it again at additional expense when you get so sick of it it drives you mad.
Save the headache - do the best option, and worry about power later.
Turbo
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