Solar Builder

JAN-FEB 2019

Solar Builder focuses on the installation/construction of solar PV systems. We cover the latest PV technology (modules, mounting, inverters, storage, BOS) and equip installers/contractors with tips and tools to make informed purchasing decisions.

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SOLARBUILDERMAG.COM | 19 2.4GHz mesh network for fast and reliable data commu- nication between the microinverters and the gateway. The QS1 is positioned to maximize high output PV panels up to 375 W by providing a higher peak output power (a microinverter-leading 300 W AC output per channel) and a wider MPPT voltage range (22V-48V ) that allows for bettering tracking and energy harvest dur- ing low light conditions of dawn and dusk. "It also features four individual MPPT so each PV module is managed and tracked separately, which means things that affect a single panel such as shading or debris do not affect the output from the rest of the panel even if they're connected to the same microin- verter," Higginson says. Compatibility An APststems calling card is reducing the number of microinverter units needed per project. Only one QS1 unit is needed for every four modules (instead of the stan- dard 1:1 ratio) while still providing four independent MPPT. This means fewer units to stock, transport and install while costing less than the equivalent of four indi- vidual microinverters. There are shared components that reduce the overall cost per watt by comparison. But it's not all shiny new performance numbers and doodads — APsystems kept the AC trunk cabling com- mon with its dual-module YC600, which adds a hugely important flexible, mix-and-match compatibility on the same circuit to enhance site design capability and maxi- mize circuit capacity. "Using an even number of PV modules is ideal, howev- er, with the APsystems 4-in-1 and 2-in-1 cost advantages, even if there are an odd number of PV modules in the array, leaving one side of a YC600 unused doesn't signifi- cantly impact the cost per Watt of the system," Higginson says. Both microinverters also utilize the same gateways, so installers can choose the ECU-R for single or multi-resi- dential installations or the ECU-C for applications requiring consumption monitoring and advanced contact/ relay features. "Compatibility with the existing YC600 microinverter system gives the QS1 an unprecedented advantage," says APsystems chief technology officer Yuhao Luo. "Mixing dual and quad microinverters in the same system adds design flexibility while offering a strong inventory and installation labor advantage over conventional microin- verters." Chris Crowell is the managing editor of Solar Builder. Yaskawa Solectria Solar and Alencon Systems are combining their areas of expertise to start repowering 600V PV plants. The partnership brings together Alencon's String Power Optimizer and Transmitter, the SPOT, and Yaskawa Solectria Solar's XGI 1000 transformerless string inverter. The integration of the Alencon SPOT and Yaskawa Solectria Solar's XGI 1000 offers end users a tested and complete solution for repowering 600V PV plants with new high-efficiency inverters and optimizers. The updated PV array will be able to remain negatively or positively grounded as originally designed. Interoperability was confirmed during extensive compatibility testing of the two units at Alencon's power electronics laboratory located at their Hatboro, Pa., headquarters. Testing included oper- ating the XGI 1000 inverter in a constant voltage mode, where the SPOT performs string level maximum power point tracking while providing the XGI 1000 a fixed voltage that allows it to run at its maximum efficiency. Yaskawa Solectria, Alencon offer combination to repower 600-volt PV plants

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