I also unplug my U890’s when not in use. I have a short male-female extension with inline switch (https://www.amazon.com/gp/product/B01HGNN30M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1).
As D10 mentioned above, the panels bias up in seconds as per Roger West.