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Old 06-27-2013
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Re: Digital voltmeter as a battery monitor

A couple of hours of lighting a day
Charge an iPad mini (daily)
Charge a mobile phone (every few days)
Charge an iPod nano (every few days)
Trickle charge to a small 12v Bluetooth speaker
I'm going to guess here that your lighting is the real amp eater. Are your lights AC (using an inverter) or DC (12 volt) and are they incandescent or fluorescent or LED?
I'll assume 12v incandescent. Three lights at 9 watts each = 27 watts, times 3 hours = 81 watts.
iPad mini ~ 20 watts *for 1 hour
Phone ~ 10 watts *
Nano ~ 5 watts *
Speaker ~ 10 watts (Trickle charge makes little difference) *

All this = 126 Watts

Guessing 4 decent hours of sun per day you'll need a 30 watt panel near as I can tell. All guess work.
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