Solar Grid Connect Inverters

Solar grid connect inverters are also called “string” inverters because the PV modules must be wired together in a series string to obtain the required DC input voltage, typically up to 600 VDC in residential systems and up to 1,000 VDC for commercial and industrial systems. String wiring is quick and easy to install, and the higher voltage helps to minimise cable losses and allow smaller wire size. However, in string wiring, maximum power point tracking (MPPT), along with any monitoring output, is performed at the string or array level.

Three-Phase Inverters are used in larger commercial grid-connect systems. These are available with power ratings from ~ 5- 100kW with input voltage ratings of 1,000 VDC which enables longer module strings.

Inverters automatically adjust PV array loading to provide maximum efficiency of solar panels by means of a maximal power point tracker (MPPT).

Units can be linked in parallel allowing extreme system design flexibility with the possibility of low cost system expansion and maximum system efficiency.

This makes the inverter ideal for use alone or as part of a large PV plant.

Module Optimisers can be used, connected to each module to provide individual module-level MPPT tracking and monitoring, optimising the DC output that is connected to a string inverter for very high efficiency. Systems that combine optimisers with low-cost high-efficiency string inverters can simplify system design and maximize safety.

These are an all-in-one solution for solar energy supplies combining PV solar inverter and energy storage device in one unit. They can charge a battery using surplus energy for use in times of low generation and some can also supply backup power to protected loads during a grid outage. Some can be used with or without solar.