I've been playing and testing the device for over 2 weeks now (retired - have time). I was impressed with the switching time between utility and inverter and back. - Absolutely no flickering lights in the house or on any of the PC or TV monitors. The device allowed me to get the most out of my solar panels and battery without my battery voltage dropping below 12.5V. volts (after 2 hours rest). I set my battery pack regulation (3 x 102Ah - 306Ah - Flooded Lead Acid - Deep Cycle) to 12.1V public supply and switched back to 13.8V inverter. So I try to conserve battery life and optimize solar power (which we have in abundance in South Africa) during the day and wind power at night. I can recommend the product - it works very well. JS
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