Re: couple of non related electronic questions
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Q1 - depends on the total wattage of the lights but (for example) a 7M string of 12V cluster lights runs out to about 9W so at 12V that's 0.75A so a 450 Ah battery is going to run them for weeks (well 600 hours).
Q2 - as long as they are 12V capable items then yes. Most portable card readers are and the iPad supports an accessory 12V charger that can be used to run it but be aware that most of the 12V Apple chargers only supply 2A which is just enough to run it.
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Observatio Facta Rotae
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