I am designing a small grid connected solar PV power-plant.
As the battery's capacity is specified in Ah and demand in kWh. What is the best way to size the battery bank?
I have battery price in USD by piece. How can I transform it in USD per kW ou USD per kWh?
If battery is 12 V and its capacity is 100 Ah, then the energy stored is 12 x 100 =1200 Wh = 1.2 kWh (theoretically, the actual capacity is less because battery cannot be fully discharged, anyway it depends on battery type). If your power plant is grid connected, why do you need a storage? What's the actual scope? peak shaving? Anyway I suggest to graphically compare production curve and loads (e.g. on hourly base) and calculate the "area" of the mismatch zones. The biggest of these is your needed capacity. It's a simplified approach and actual necessary capacity could depend also on other factors (e.g. charging rate), but it's a good starting point.
Tks for your answer.
As we have hourly tariffs, batteries can save money being used in peak hours where tariffs are greater. So, I need to size the bank to operate 5 hours daily.
You can find some useful info here (chapter 2):
https://www.sciencedirect.com/book/9780123749918/renewable-energy-system-design
and here:
Article Photovoltaic/battery system sizing for rural electrification...
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