07-09-2022, 11:03 AM
(This post was last modified: 07-09-2022, 11:12 AM by Murphyv310.)
Hi.
Paul, it's not as simple as P=VxI. Look as many SMPS that have a wide input spread from 100 to 250 volts, if the required output load is constant then so is load on the mains, if it requires 1 amp at 240v it will require 2 amps at 120v.
I also remember many times industrial pressure washers that had a 3kw induction motor that blew the 13 amp plug fuse regularly, the Start/Run cap would be OK or even replaced, then you'd discover that the mains would be low at 220v and even less on remote farms especially under load, the only cure was a 16 amp socket not a cut down nail in the 13 amp plug. So the simple formula doesn't always hold up unfortunately.
PS, my own Nilfisk MH4C pressure washer is rated at 2800 watts and I've noticed on a very odd occasion a popped fuse, a quick check on the mains reveals a level of just below 230v off load, I think the fuse just slowly melts, the plug is quite hot with the live pin the hottest
Paul, it's not as simple as P=VxI. Look as many SMPS that have a wide input spread from 100 to 250 volts, if the required output load is constant then so is load on the mains, if it requires 1 amp at 240v it will require 2 amps at 120v.
I also remember many times industrial pressure washers that had a 3kw induction motor that blew the 13 amp plug fuse regularly, the Start/Run cap would be OK or even replaced, then you'd discover that the mains would be low at 220v and even less on remote farms especially under load, the only cure was a 16 amp socket not a cut down nail in the 13 amp plug. So the simple formula doesn't always hold up unfortunately.
PS, my own Nilfisk MH4C pressure washer is rated at 2800 watts and I've noticed on a very odd occasion a popped fuse, a quick check on the mains reveals a level of just below 230v off load, I think the fuse just slowly melts, the plug is quite hot with the live pin the hottest
