Energy Storage Power Electronics: Page 6 of 6
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Founded in 2006, SolarEdge Technologies began commercial shipments of its string inverter, module-level dc optimizer and monitoring systems in 2010. The company’s global headquarters are in Herzliya, Israel, and its US division is headquartered in Fremont, California. SolarEdge was one of two inverter manufacturers participating in the PR wave that announced Tesla’s lithium-ion Powerwall Home Battery and is the first inverter manufacturer to have fielded Powerwall systems in the US.
SolarEdge’s single-inverter StorEdge system has four primary components. The system’s single-phase StorEdge dual-port inverter and Connection Unit functions as an optimized PV inverter that also provides power conversion and management for battery charging. Tesla’s 6.4 kWh lithium-ion Powerwall Home Battery provides energy storage. A 120/240 Vac split-phase autoformer performs phase load balancing in StorEdge systems configured for backup power during grid interruptions. Finally, the addition of SolarEdge’s Electricity Meter enables smart energy management functionality that includes export power control, time-of-use shifting, maximized self-consumption, demand response and peak shaving capabilities.
The StorEdge inverter for the US market, model SE7600A-USS, has a rated ac power output of 7,600 W and a maximum ac power output of 8,350 W when feeding electrical loads or exporting to the grid. In backup mode, it has a rated power output of 5,000 W and a maximum 10-second ac surge rating of 7,600 W. The inverter’s nominal dc bus voltage is 400 Vdc. SolarEdge’s StorEdge inverter and module-level dc optimizers provide NEC 2014 Section 690.12 rapid-shutdown functionality for the PV array and battery. StorEdge system’s Electricity Meter carries a 5-year warranty. Its autoformer and inverter carry a 12-year warranty, with an option to extend that to 25 years on the StorEdge inverter.
SolarEdge Technologies • Fremont, California • 510.498.3200 • solaredge.com
With corporate headquarters in Bavaria, Germany, and US headquarters in Los Angeles, sonnen has deployed more than 10,000 of its sonnenBatterie–integrated energy storage systems, primarily in European self-consumption markets. Founded in 2008, sonnen announced availability of its sonnenBatterie eco and sonnenBatterie pro models for the US market in December 2015. One element of sonnen’s long-term vision for its business is a virtual power plant model, the sonnenCommunity, that aggregates customer-sited sonnen energy storage systems and monetizes the pooled stored energy capacity and associated grid resources.
The sonnenBatterie eco energy storage solution, designed for residential self-consumption and grid backup applications, integrates power electronics, Sony Fortelion lithium iron phosphate (LiFePO4) cells, and proprietary management and monitoring software. The eco comes in seven energy storage capacity options, ranging from 4 kWh (eco 4 model) to 16 kWh (eco 16 model) in 2 kWh increments, with a usable capacity based on a 100% cell DOD. sonnen has configured the lithium iron phosphate cells for a low-voltage dc bus with an operational range of 48–56 Vdc. The company warranties the eco system’s batteries for 10 years or 10,000 cycles.
The eco system has a split-phase 120/240 Vac output and can be ac coupled with existing or new PV installations. In stand-alone mode, the eco 4 through eco 8 models have a 100-millisecond maximum power rating of 8,500 W and a 5-second maximum power rating of 6,000 W. The higher-capacity models, the eco 10 through eco 16, have a 100-millisecond maximum power rating of 17,000 W and a 5-second maximum power rating of 12,000 W. Non–revenue grade PV and load metering is standard. The sonnenBatterie eco system’s power electronics are certified to UL 1741 and carry a 10-year standard warranty.
sonnen • Los Angeles • 310.853.2404 • sonnen-batterie.com
Headquartered in San Francisco, Sunverge was founded in 2009. In February 2016, it announced its second-generation Solar Integration System (SIS) energy storage platform, with a streamlined design, more battery options and greater system intelligence than the original SIS. While other vendors offer fully integrated system packages for residential and small business storage systems that couple power electronics with lithium-ion batteries and are certified to the relevant UL standards, Sunverge has a forward-looking vision for its SIS product, with the goal of aggregating reserve energy from every SIS system under management and pooling it in the cloud. The resulting virtual power plants of cloud-aggregated SIS units would provide utilities and third parties a pooled resource they could monetize and use to balance grid demands.
Sunverge’s current SIS product integrates lithium-ion batteries, power electronics and cloud-based management software in a single enclosure with options for indoor or outdoor installation. It supports multiple lithium-ion battery chemistries and storage capacities from 6 kWh to 25 kWh. For residential installations, its power electronics package interconnects with split-phase 120/240 Vac services. It is designed to ac-couple existing or new PV systems of up to 8 kWdc, with options to support larger secondary systems. Operational modes include backup, self-consumption, self-consumption with grid leveling, time-of-use optimization and peak shifting. The Sunverge SIS is certified to UL 1741 and UL 1778 and carries a 10-year standard warranty.
Sunverge • San Francisco • 415.795.3660 • sunverge.com
Joe Schwartz / SolarPro / Ashland, OR / solarprofessional.com