sbayne, thanks.
tksteingraber, thanks for sharing your great results with the Powerbright. Which and how much battery storage (amp hr) are you using with your unit? I looked on their site, clicked on the user manual for their lower quality modified sine wave inverters. It seems that even lower battery power can still be used with any inverter, although the inverter will not provide as much time of use. The dimensions and weight of the Powerbright modified sine wave inverters resemble the pure sine wave inverters of Giandel. Of course, your pure sine wave inverter is stated to produce the purest quality from Powerbright.
Perhaps the most attractive package is from Giandel, with their 5000 watt hr pure sine wave inverter, fed by two Amperetime 200 amp hr batteries, for $2800. Next attractive is to save $800 and get one Amperetime battery. See the pictures from ricevs' site, tweakaudio. The advantage of Powerbright is their east coast location with phone number.
Right now I first have to figure out how to ground the inverter from my 3rd floor apartment. Giandel says grounding is essential for safety reasons.