Husstand string energilagring inverter

What is a string inverter?

For utility-scale systems, strings often consist of 20-30 modules installed in series. String inverters have historically been more common at the residential and commercial scales, where string-based designs with MPPTs are effective at maximizing energy harvest from arrays with partial shading, multiple orientations, or undulating terrain.

How many kilowatts can a string inverter run?

Currently, developers can source string inverters rated for upwards of 350kW per unit. Many string inverter manufacturers offer skidded or cluster-mounted solutions that co-locate hundreds of kilowatts of string inverters into a “virtual central inverter” configuration.

How many inputs can a string inverter handle?

Smaller string inverters may have as few as one input, with one PV string per input. Larger string inverters can handle many string inputs. In both cases, string inverters will likely have integrated maximum power point trackers (MPPTs) on their input (dc) side to boost array performance at the string level.

Are central inverters better than string inverter?

Fewer equipment areas: Developers will inherently need fewer central inverters than string inverters for the same overall project capacity, leaving more space for the PV array and less for inverters and balance of system components. Lower perceived risk: Central inverters are more mature than string inverters.

How many kilowatts can a PV inverter handle?

Pad-mounted central inverter co-located with a medium-voltage transformer. The first PV inverters were developed in the 1980s as a spinoff of drive system technologies. At the time, all models could be considered central inverters rated to handle no more than a few kilowatts. As with any new technology, early iterations were far from perfect.

Why are utility-scale developers switching to string inverters?

Some utility-scale developers are switching to string inverters due to: Lower operational expenditure (OPEX): A smaller form factor means smaller parts, shorter spare parts lists, and simpler repairs. No special training or heavy machinery is required to repair most string inverters.