Pure Power Engineering is a full service company specializing in photovoltaic systems with energy storage. We have experience designing both residential energy storage systems and commercial scale residential systems. So whether you have a 1,500kWh of batteries in a 40′ container or a single 5kWh battery stack, AC coupled or DC coupled, we have you covered.
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What happens when there are two separate subarrays feeding the same inverter? The code doesn’t clearly state how to approach this scenario so Pure Power looks at the philosophy of the code and what it is trying to achieve, and develops an interpretation consistent with the intent of the code. Continue Reading
In a previous article “The 120% Rule Explained – 2011 NEC 705.12(D)(2)” we clarified the philosophy of the 120% rule for load (supply) side interconnections of solar PV systems. The 2011 code was clean, understandable, and easy to safely apply. … Continue Reading
Here is something that’s crazy, and yet we completely understand why they did it. Someone put duct tape around the vents of a NEMA 3R transformer. Continue Reading