Gentlemen, Having researched the subject of isolating from the grid to try to convert my shop I will interject a comment or two. The KWH cost of utility power is amazingly cheap compared to generating it locally. The KWH cost is not the only cost. At least once a year we experience a power glitch of the form necessary to harm sensitive electronics (and at times other things connected to the power lines). We have ground devices to attempt to shield our machine controls. These shield devices do not always work. I do not know how much the added cost truly is but the aggravation is tremendous. When you see the lights flicker bright or dim you cringe. If a machine stops you do not know if it will restart. Many times one of the machines will not restart. The remedy for restart is usually a board replacement. The board is not cheap. The downtime is not cheap. How do you quantify it? How do you know if the next board you replace was not damaged by the same event that killed the previous board? We have replaced all four boards in each of three machines in a year. This replacement came after a particularly damaging power fluctuation. I would definitely like to be isolated from the grid. thanks Stuart
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