Equipment used:

Inverter/PWM Controller:  http://a.co/fdl9YzI

2x 35ah Batteries: http://a.co/5JBIxTC

100w solar panel:  http://a.co/5JBIxTC

We need power!  While doing bird research in the wilds of northern NH, it became evident we needed electricity to power computers, big cameras, and phones/GPS units.

Below is a table of the system and our expected electricity needs:

System Solar 100w 35ah universal (x2)
Ah per day: 33.33333333 35 TOTAL Ah Reserve: 70
V 12 12 Parallel wiring: 12v
Wh in: 400 420 TOTAL Wh Reserve: 840
W 100
Cost $105.00 $64.00
ah/$ 2
Sun Hour / Multiplier 4 2
Need/Day Wh multiplier consump. in Wh = 259.36
Computer 100 2.5 250
iPhone 1.7 2 3.4
AAs 11.2 0.3 3.36
Camera 2.6 1 2.6

*The milk crate system below can charge a 100 watt MacBook Pro around 8-9 times from being completely empty.  

**Remember:  V*A=W,  W/V=A, and Watts over time is Wh.  

-Jess

+/- relates to size of standard prongs

Parallel maintains 12v but doubles Ah. (Series would go to 24v at 35ah)