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Hi Alex.
If you are going to use a Battery charger, which I assume you will, that will take care of the voltage for you. Higher voltages at the panels will work better for your system charging, up to a point. For example, I use five 38 Volt panels in series to give about 160 Volts DC in full sun, and four banks of these run in parallel together to give 20 panels in total. This goes to the MPPT battery charger which reduces this down to 55 Volts to charge my "48Volt" batteries but, optimises the power going into the batteries by increasing the charge current. That's the benefit of MPPT charging over PWM charging.
Regards Joshua
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