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1000 vdc
Photovoltaic systems have always been limited by the low efficiency of the solar panels themselves, as 25% efficiency would be the market-leading or theoretical maximum level of monocrystalline cells. Therefore, in order to produce as much energy from the system as possible, PV designers must try to minimize losses in connections and the conversion process from panel DC output to AC for the grid. This is done by connecting panels in series, so that power is processed at high voltages where currents and “I2R” losses are lower. For example, grid-connected systems typically have blocks of 22 panels with cells connected in strings to give 1000 VDC producing 5.5 kW per string. 2727 strings might then be combined for a 15 MW installation. However, the line loss of 1000 VDC systems can be further reduced if the system could accept higher input voltages, which is where 1500 VDC systems have come into play.
PTM Published on: 2018-09-13