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The video was shown with no load, but with a load such as a drill or small vacuum it does change the waveform a bit. I am designing an inverter that will take a high voltage DC bank of batteries and convert directly to pure sine wave with no step-up. This should increase efficiency and allow a much smaller footprint for the inverter, and also be much easier on the batteries since they wont have to supply but more than 10 amps per 120VAC leg (double stacked). Charging will change to a simple digitally controlled converter and then into the battery bank. I.E. rectified 240VAC into a 180VDC battery bank digitally controlled by two triacs (phase control).

This setup should simplify power conversion, increase efficiency and greatly increase the life of the battery bank. Basic testing of this system shows a set of 30 Trojan T-105’s that barely have to do any work (10-20amp max load and 5 amps constant) so it looks promising so far. Charging from the panels will be simple since we just take a high voltage string of panels and use a PID control loop to handle direct charging of the bank of batteries from the panels without step-up or step-down. This also allows me to run my 240VAC welders from the source instead of firing up a generator.

My desktop is required for my work as well since I design circuitry, program microcontrollers and make simple communication apps in CSharp for them. I use the UPS’s for power outage situations only, but I would never go back to modified sine wave to run this system and the rest of the house. It’s just not financially worth it for me to run anything but pure sine wave.

<span style=”line-height: 1.5em;”>Tad</span>