SMA SI 3324 - Manual (Page 74)

Glossary SMA Technologie AG
Page 160 SI3324/4248-14:FE2406 User Manual
String
Describes a group of solar modules connected in series. A PV system usually consists
of a number of strings, which avoids yield losses due to variations in shading over
different modules.
String inverter
An inverter concept that avoids the disadvantages of the central inverter concept. The
PV is split into individual strings, each of which is connected to the external mains
supply with its own string inverter. This greatly simplifies installation and greatly
reduces the yield losses caused by manufacturing deviations or variations in
shadowing of the solar modules.
VRLA
Valve Regulated Lead Acid battery: Lead-acid battery with semi-solid electrolyte or
sealed lead acid battery. Examples of this type of battery are Gel batteries and AGM
batteries (Absorbent Glass Mat).