How much power (W) does phone charger draw?

[Ralph Cramden]

I've got over 200 Kyocera phones to keep charged for a transportation base. Lookign at generator backup, I need to know how much generator capacity charging the phones will require.

 

[Someone Somewhere]

Probably about 5-15W, but it really depends on what model they are and how efficient the plugpacks are.

Also worth noting that the phones will only draw that much power when charging; I would expect it to be <1W when full.