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Garry Jenkins gravatar image

Hi Helen The European solar website noted above (https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html#PVP is a fantastic tool for a quick solar PV design. I used it loads of times in the past when I was an energy consultant ( now retired) If you pretend that your system is an off grid solar you can see how storage affects it. You can get hourly data for your site in Nigeria from the map. It will optimise solar panel angle and orientation for max efficiency Although I don't know about irrigation systems, in general I assume that water storage tanks are a lot cheaper than batteries, so you just need a big enough tank to cover your needs for the longest period where there is insufficient sun. Practical Action have designed loads of solar irrigation systems for Zimbabwe and have loads of practical detail somewhere on their website Good luck!