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» Learn about Photovoltaics » Grid-tied » Selecting a Grid-Tied Inverter
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Selecting a Grid-Tied Inverter
Generally speaking, a Grid-Tied inverter will be sized based on the array size. If you have 3,000 STC
watt array size, you will want to use at least a 3,000 watt inverter. Several factors will go into your
selection:
- System Location
- String Configuration
- System Expansion
We will briefly discuss each of these factors.
System Location
The location of the modules within a system will play a large role in selecting your inverter. If you
plan to divide your system into multiple arrays in different locations, you will most likely want to
use separate inverters for each array. Anytime multiple arrays are at different angles or facing
different directions, separate inverters will lessen the impact of shading.
String Configuration
Every inverter manufacturer will have a string sizing tool to aid you in system sizing. A string
refers to a string of modules in series to accomplish a desired voltage input. When you connect
module together in series (positive to negative), the voltage adds. Most inverters will have a DC
voltage range between 150-450 Volts. Therefore, if you have a 32 module array, a desired array
configuration may be 4 strings of 8 modules in series. Refer to our products page for a list of
inverter string sizing tools.
System Expansion
If you are thinking of expanding the size of your system in the future, it may be beneficial to
oversize your inverter to allow for this. This can easily be done for small expansions, but
large expansions will typically require an additional inverter. Your inverter's string sizing
tool will provide you with details on maximum and minimum array sizes for your inverter.
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