208V UPS vs 120V UPS

The following series of UPS has both 120V and 208V versions in capacity sizes of 1000VA, 1500VA, 2000VA, and 3000VA:
http://www.minutemanups.com/products/endeavor.php
But here's the rub. In the 120V versions, they use the following plug sizes for the power cord:
1000VA -> NEMA 5-15P 1500VA -> NEMA 5-15P 2000VA -> NEMA 5-20P 3000VA -< NEMA L5-30P
No surprise there. However, the 208V versions seem oversized:
1000VA -> NEMA 6-15P 1500VA -> NEMA 6-15P 2000VA -> NEMA L6-20P <-- should only need 6-15P 3000VA -< NEMA L6-30P <-- should only need 6-20P
Was someone thinking "inside the box" and associated 2000VA with 20 amp plugs and 3000VA with 30 amp plugs?
One potential argument is that when a UP has been operating from battery for a while, and the source power returns, it has to support the connected loads AND recharge the battery at the same time. I'd agree that can increase the current the UPS draws from the wall receptacle. But this same logic should push some of the 120V models into a higher plug current capacity configuration.
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