# How long can i run this appliance? [closed]

How long could I run a 115 Vac window unit on a 12v 200Ah battery (using a 700W inverter from a 400W solar panel and assuming 100% efficiency)? Thanks!

• I'm voting to close this question as off-topic because homework-like questions should show what has been tried and narrow the question to one conceptual difficulty. – The Photon Jan 30 at 3:26
• This is not going to work. get a 12V air con. – Jasen Jan 30 at 5:21
• this cannot be answered ... you did not say how much power the window unit uses – jsotola Jan 30 at 5:47

A 700VA inverter can only produce 6A at 120V, it will not be able to start the compressor in a window AC. So, zero hours, unless you only run the fan.

i will give you most basic calculation

assuming your battery in good condition and new with trusted specification.

12*200=2400W/h this can steady until 1hours rate = 2400W total output

assuming your converter connected with load is 100% back to back without loss power which is highly unlikely.. 2400/700 = ~3.43Hours

the calculation with solar panel is different because you doesn't gives how much sunlight and how long it will directed to sun..

• Where does this 10 hours come from? – Ron Beyer Jan 30 at 3:58
• oh yeah i forget.. its way overpowered it's discharge rate of some battery not leaded acid battery.. yes you are right only capable 3.42Hours. i will edit – XC Source Jan 30 at 4:04