Hi All, Wondering if anyone would have a simple spreadhseet to show the amount of batteries and storage needed for a 5MW solar PV system. I am looking to demonstrate to a client that it is not financially viable and he needs to export rather than on site storage/Use.
The other factor is how a long run of rainy days will be handled - is there a need for back up power, or is it the load of a form where it is OK for the load to be shed ?
A 5 MW system cannot run a 2.2.MW load 24/7 even with the best possible storage, as more than half the time it is not unobscured midday sun, on which the output figures are predicated. Advice varies, but to see 10-20% of full sun output on an overcast day is typical, less with darker clouds of course.
There is a lot of difference between a system that is the sole means of generation, where over capacity by a factor of five or even ten and storage for several days is needed, and one that is just used to shave a bit off the bill in summer, but is not essential. which may not need storage at all.
It is important to clarify this distinction to a non technical customer.
The other factor is how a long run of rainy days will be handled - is there a need for back up power, or is it the load of a form where it is OK for the load to be shed ?
A 5 MW system cannot run a 2.2.MW load 24/7 even with the best possible storage, as more than half the time it is not unobscured midday sun, on which the output figures are predicated. Advice varies, but to see 10-20% of full sun output on an overcast day is typical, less with darker clouds of course.
There is a lot of difference between a system that is the sole means of generation, where over capacity by a factor of five or even ten and storage for several days is needed, and one that is just used to shave a bit off the bill in summer, but is not essential. which may not need storage at all.
It is important to clarify this distinction to a non technical customer.
