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What size battery storage is recommended for a 3kwp pv system?

Hi, I'm currently in the process of building a 3kwp pv system. Im not sure how many batteries I will need. The batteries need to be either 12v or 24v if possible. Thankyou.

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Off grid or you have grid available?

Will you use an inverter or it will be a DC only system?

If you will have an inverter, how big it will be? If 3000VA or larger, go for a 48V system (48V battery).

What type of battery (lead-acid, LiFePO4, etc.)?

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