What are the challenges at distribution transformer level to scale up grid-interactive rooftop solar? Is there a load limit on how much rooftop solar can be allowed? What are the other technical challenges?
A rooftop is limited by space/ the number of modules that it can accommodate for a given load and intensity of solar radiation (irradiation/insolation). In essence, the size of the rooftop is a limiting factor to PV power generation. The PV power generation is a function of:
(1) Irradiation/insolation (2) Total module area (3) Module's technology / efficiency (4) Peak Sun Hours / sun hours duration .
While many rooftop solar installation projects have been installed, size of the roof, load bearing capacity are some limitation. There are many micro grid installations here in Bangladesh however serious power generation limits are present and unless higher efficiency, economically viable solar panels are manufactured, these will remain to be severe limitations. As not much significant power is generated from these rooftop installations, on grid connections are not feasible.
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