I have a 45 W, 230 VAC fan (this) that I am trying to power through a 12 V 50 Ah deep cycle battery with a BESTEK 300 W modified sine wave inverter (this). The fan works fine from 240 VAC in the house, so it's not the problem. The inverter supplies an 230 VAC -> 12 VDC x 5 A transformer (60 W max total load, ignoring inefficiencies) fine, so neither it nor the battery are fault.
The fan's behaviour is odd. When you power it on mains, it will beep once, then you can control it via an IR remote, or with buttons. Importantly, the motor does not immediately start - you need to press a button to start it. When powering it on via the inverter, it beeps... then it beeps again, repeatedly. Neither the buttons nor the remote allow it to start turning.
I have two considerations here, but I am a little skeptical of both of these, because of the fact that the fan doesn't actually start until you press buttons.
- I need a pure sine wave invertor. This thread seems to indicate this might be the case, noting that "anything with an inductive or motor load, pure sine wave is better".
- I need a more powerful inverter, because of the inrush current - I could need up to 10x the standard operating 45 W, so perhaps a 500+ W inverter.
(General note is this all UK voltages and for the mains, 230 V 50 Hz)