Use "Site Assessment Tools" to estimate the amount of energy harvested by PV Power Palnts.
Implementing and integrating PV Solar systems on a roof, poll or any other available structure, must be carried through a set of procedures in order to determine if that site is suitable for a PV power plant power.
First step for a good dimensioned system is a proper site assessment. In performing a site assessment we have to consider micro climate variables in order to evaluate the system layout and the amount of energy we will be able to harvest. Shading analyze is the most important data acquisition procedure for our project. Typically, designers strive for placing systems in a wide-open, shade-free place, oriented in the time window from 9 a.m. to 3 p.m. towards geographical south (for the case we are located in the northern hemisphere).
Things are becoming more complicated when different obstructive elements are part of the layout. To do a shading site analyze we offer couple of solutions where shadings and solar irradiance is mapped for a year long using software, GPS and digital cameras. Besides shading assessment, power load estimate it is next to be performed in order to find out if the critical load can be covered by our PV power plant. In conclusion our site assessment will be conducted based on shading analyze, wind factor measuring, critical load estimate, site layout and dimensional elevation (angle, pitch and distance measurement).
Additional we will take in consideration in our design an array of indirect factors from recorded maps and climatic statistics with regard to that specific geographical microclimate. The indirect factors are those who derate the optimal values adjusting them towards the real working condition.
To accurate determine maximum energy output for a PV power generation system, we should proceed with exact calculations. The energy output it is influenced by different factors and local climatic conditions; solar irradiation which is different with each season, local cloudiness or fogginess, average gradient of temperature and so on.
Shading losses of photovoltaic systems can not be avoided, but at least portion of them can be minimized. To minimize shading at the string level, PV modules should be always mounted horizontally and never vertically. Reason is quite simple: each crystalline module usually includes two bypass diodes which are active if shading occur. When modules are mounted horizontally the module still operates with some amount of power (50% or less) if the bottom row is shaded, because only one bypass diode is active. But if modules are mounted vertically and if the lower row is partially or completely shaded both bypass diodes are active and the amount of power output is close to zero.
In situations where shading can not be avoided the use of polycristaline (amorphous) modules should be considered. Polycristaline modules are far less sensitive on partial shading, comparing to Monocrystalline modules. Even in case of partial shading they produce significant amount of power.
The information posted herein has been compiled by Clean Energy Brands from OEM product data and reputable publications. All rights reserved!