losses that result from MPP mismatch between modules (due to shading soiling temperature mismatch uneven aging manufacturing tolerance and many other reasons.
Module-level power optimizers track the Maximum Power Point (MPP per module guaranteeing that it is producing the maximum possible power while not affecting the rest of the modules in the string.
SolarEdge power optimizers also measure the performance of the modules and transmit performance data to the module-level monitoring portal. This enables cost effective maintenance of the PV system due to pinpointed alerts on any underperformance issue. Additionally power optimizers keep a safe DC voltage during installation maintenance fi refi ghting and any other emergency.
DC input allows for longer strings of PV modules much like is common with standard grid-tie inverters which decreases the BOS costs and greatly simplifi es installation.
VarioString: Isolated Dual Channel High Voltage MPPT
VarioString is a high power isolated dual channel MPPT solar charge controller for off-grid systems and battery based energy management systems up to 105kW. It is compatible with all battery technologies (lead-acid lithium-ion NiCd etc. due to its programming options for the charge cycle. Its fast and accurate algorithm ensures an MPPT effi ciency of more than 99%.
The ability to arrange the dual MPPT inputs independently or in parallel (with max 600Voc or in series (with max 900Voc allows the VarioString to be used in a wide variety of PV confi gurations and eliminates the need for some Balance of System (BOS components such as junction boxes string fuses and high gauge wire to connect the PV array to the battery storage area.
Whenever the inverter or the AC power are shut down power optimizers will automatically reduce modules voltage to 1V to prevent electrocution and fi re.
Finally the module-level MPPT and fi xed string voltage features of the SolarEdge solution eliminate all design limitations of traditional inverters allowing quick and easy system design with parallel strings of unequal length multiple orientations in one string modules with different power ratings in one string and full roof utilization for larger system capacity.
While battery based solar MPPT solar charge controllers are typically used for off-grid applications increasingly the DC-coupling of PV is used in battery based energy management systems with connection to the grid to increase system stability and system effi ciency for energy consumed when the sun is not shining.
The VarioString responds to the need to decrease BOS costs increase fl exibility and modularity of BOS components and at the same time increases system performance and overall energy yield.
The VarioString has been designed to meet the needs of battery based management systems. The high voltage
The fully programmable 4-step battery charger extends the life of batteries which reduces O&M costs and the amount of batteries being disposed of. The VarioString makes it possible to create fl exible residential PV systems with only one device. Studer had the forethought to create a product with high power and high effi ciency for different PV arrays.
The Solar Industry Awards will be announced 9 September 2014
and the Awards ceremony will be held on the 23 September 2014
at Sofi tel Legend The Grand in Amsterdam
Issue IV 2014 I
www.solar-international.net 55
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