If I had to guess she&#x27;s talking in terms of each individual tank&#x2F;unit set-up. So, one tank has a capacity or power rating of 500kW (capacity in the sense of the way a utility refers to size&#x2F;ability of generating units). This link[1] possibly covers some of the confusing terminology here, and why it is that way.<p>EDIT: Scrolling to the bottom of their homepage[2] explains it, their system components are independent of each other.<p>[1] <a href="https:&#x2F;&#x2F;gigaom.com&#x2F;2012&#x2F;01&#x2F;04&#x2F;how-to-compare-energy-storage-projects&#x2F;" rel="nofollow">https:&#x2F;&#x2F;gigaom.com&#x2F;2012&#x2F;01&#x2F;04&#x2F;how-to-compare-energy-storage-...</a><p>[2] <a href="http:&#x2F;&#x2F;www.lightsail.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.lightsail.com&#x2F;</a>