PV cells or modules are typically connected in series strings to build voltage.

  Strings of PV cells connected in parallel to build current.

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Four Parallel Strings Landing in Combiner, can also combine at

Inverter DC in Strings of modules connected in parallel to increase current, power

  Modules are added in series to form strings or panels, which are then combined in parallel to form arrays.

  The overall I-V characteristics of a system of PV devices in parallel are dependent on the similarity of the current outputs of the individual devices.

  Note the test conditions used for this module. Does this jive with typical conditions for your site?

  Why would this matter?