Measure the open circuit voltage of the photovoltaic panel

Read the voltage on your multimeter and compare it to the open circuit voltage (Voc) listed on the back of your panel. If your voltage reading is negative, reverse the probes and measure again. [pdf]

Photovoltaic panels have high current but generate electricity very slowly

If your panels aren't producing any electricity when you'd expect them to, it's most likely a fault with the inverter or problem with the wiring. Occasionally the generation meter might fail. [pdf]
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Will connecting photovoltaic panels in parallel increase voltage

When connecting solar panels together in parallel, the total voltage output remains the same as it would for a single panel, but the output current becomes the sum of the amperage of each panel. [pdf]
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What is the voltage of photovoltaic series inverter

A solar inverter or photovoltaic (PV) inverter is a type of which converts the variable (DC) output of a into a (AC) that can be fed into a commercial electrical or used by a local, electrical network. It is a critical (BOS)–component in a , allowing the use of ordinar. Input voltage (Vcc): this value must be equal to that of the battery (12, 24, 48 V). Output voltage (Vac): this value must be normalized (230 Vac). [pdf]