Oh please. For less than $2 and shipping time.
http://www.oddwires.com/mini-dc-dc-booster-step-up-module-usb-5v/.....
It says 600mA rated, should run 200mA (Arduino pins total max) just fine.
I bought mine at dealextreme and got a decent break on price and shipping at qty 5 or 10. It's been a while, shop around.
This is the thing that can run dead batteries (in series) run next to flat while outputting 5V.
Module Properties: BOOST
input voltage :0.9-5V
Output voltage :5.1-5 .2 V
Output Current: 600mA (single lithium input)
Efficiency: Up to 96%
Switching frequency: 500KHz
Output ripple: 30mV (MAX) 20M
Voltage indication: LED lights with a load
Operating Temperature: Industrial (-40 Celsius to +85 Celsius)
Full load temperature rise: 30 Celsius
Quiescent Current: 130uA
Load regulation: ± 1%
Voltage regulation: ± 0.5%
Dynamic response speed: 5% 200uS
Short circuit protection: No
Input Reverse Polarity Protection: No
Connection: Soldering
Input: IN + input is level, IN-type negative
Output Mode: Standard USB
Dimentions : 2.9 x 1.8 x 0.8mm (exclude USB port)
Weight: 5grressure, the lower the efficiency)
Switching frequency: 400KHz
Output Ripple: 50mV (the higher the voltage, the greater the current, the greater the ripple)
Load Regulation: ~0.5%
Voltage Regulation: ~0.5%
Operating Temperature: -40 ~ +85
If your PV is between 1V and 5V, go find that thing's daddy to get you lots of 5V.
You can get converters that adjust, there's a brass screw, in boost and buck.
You want AC over long runs to avoid transmission losses. With DC you need thicker wire cables.
Are you off-grid?