Centralized string inverters
String inverters are currently the most cost-effective inverter option available in the US. Internationally, there are a larger number of companies that manufacture string inverters. Solar installation companies will generally offer you a system that uses a string inverter if your roof is not shaded at any point during the day and does not face in multiple directions (like a gabled roof).
How do string inverters work?
Your solar panels are arranged into ‘strings’, which feed the power they produce into a single inverter. The inverter then transforms the power produced by the panels into appliance-friendly AC electricity.
What is a “String”?
String inverter technology has been used for decades. It is a tried-and-true technology, but are not suitable for certain types of installations. If even one or more of your solar panels are likely to be shaded during any part of the day, the power output from that entire string would be reduced to its level. (Imagine a hose with a kink in it - the flow of water is slowed). Similarly, if your solar panels are installed on a roof with multiple planes and/or facing different directions, a string inverter may not be a good choice.
One of the most common reasons for a panel to produce less power or stop producing power altogether is shading from nearby objects. If your roof is prone to shading anytime during the day or in certain seasons, you could either seek to remove the source of the shade (e.g.cutting down a tree) or installing the panels where they will not be prone to shading.
Who manufactures string inverters?
There are a number of companies that manufacture string inverters. Some of the biggest names are SMA, ABB / Power-One and Fronius. You learn more about inverter manufacturers in our Supplier Search.
https://www.energysage.com/solar/101/string-inverters-microinverters-power-optimizers
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