inverter Q

[andy]

my inverter is only givin out 215VAC whatever the input voltage is. however, if i plug my monitor in it makes a weird noise (similar to a transformer supplyin a large load), and lines appear accross the screen. also, if i plug the UPS into it, it still stays in battery mode rather than switch back to mains. i have checked the manual for the UPS and it says it will go to battery if under 180VAC, i dont have the manual for the monitor tho. could the problems be due to the lower

the inverter is an 800W modified sinewave

 

[felix]

When you measured the inverter output voltage, was that on or off load?

 

[andy]

When you measured the inverter output voltage, was that on or off load?

off load. ill try it later under load

EDIT: tested again. voltage was 230VAC no load and 227-8VAC under load. load is approx 200W

 

[felix]

Since the off load voltage has gone up from 215 to 230 volts, maybe the fault has cleared. What powers the inverter?

 

[AdamW]

A lot of equipment doesn't like modified sine-wave a.c.

Either you need a more expensive inverter or you need to get yourself something that takes dc power (perhaps a laptop instead?) and a suitable dc-dc convertor.

 

[andy]

A lot of equipment doesn't like modified sine-wave a.c.

Either you need a more expensive inverter or you need to get yourself something that takes dc power (perhaps a laptop instead?) and a suitable dc-dc convertor.

so how about this: give an extra 12VDC supply to the UPS to take over from the internal battery once that goes flat