Calculating Current Ratings of Photovoltaic
In my previous article on photovoltaic (PV) systems (“ The Highs and Lows of Photovoltaic System Calculations ” in the July 2012 issue), I went
Solar panels are current limited devices and the maximum current in their specifications will always be the Short-Circuit Current: Isc. However, this is an amount that is determined at very specific light and temperature conditions. Consequently, in some conditions a panel can produce more than the Isc current.
This means PV modules cannot provide an unlimited amount of current when a dead short scenario occurs, which is an important consideration when calculating conductor and OCPD sizes. To begin the process of sizing conductors and OCPDs, refer to Sec. 690.8 in the NEC.
Each Source circuit must have OCPD rated for at least 156% of Isc. Solar panels are current limited devices and the maximum current in their specifications will always be the Short-Circuit Current: Isc. However, this is an amount that is determined at very specific light and temperature conditions.
Although the currents in a PV system vary from zero during the night to a peak at solar noon on clear sunny days, PV system currents in the dc circuits and the ac output circuits of utility interactive inverters are considered to be continuous and at their maximums at all times.
In crystalline modules, the amount of voltage produced is ~0.5V per cell, regardless of size. Therefore, module manufacturers must place multiple cells in series to produce the desired voltage and current values from their modules. In addition to physical size, the amount of current produced from PV cells is dependent on the sunlight intensity.
One of the first things to realize is that the current produced by PV modules is both current limited and directly affected by the intensity of sunlight. PV modules are listed with two current values: short circuit current (I sc) and maximum power current (I mp ).
In my previous article on photovoltaic (PV) systems (“ The Highs and Lows of Photovoltaic System Calculations ” in the July 2012 issue), I went
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