Voltage, amps, and watts
I'm a little confused on inverter use. I know that dealing with AC current, watts = volts x amps and using that formula, when I'm plugged into power, my 1200 watt coffee pot uses 10 amps of my 30 amp...
Forum Discussion
Hi clev,
I've found the listings on appliances are mostly a "guess" at the wattage.
The big problem is that battery discharge is non linear, extremely load dependent, temperature dependent, and other factors such as the age of the battery bank affect results.
Rule of thumb there are about 650 watts of usable power in a group 29 twelve volt jar. Count your jars, multiply by 650 and divide by the total load in watts. That may give you a rough idea of the maximum time under PERFECT conditions. i.e. starting from 100% state of charge with brand new batteries that have been cycled six to twenty-five times with the temperature at 25 C (77 f).
I've found the listings on appliances are mostly a "guess" at the wattage.
The big problem is that battery discharge is non linear, extremely load dependent, temperature dependent, and other factors such as the age of the battery bank affect results.
Rule of thumb there are about 650 watts of usable power in a group 29 twelve volt jar. Count your jars, multiply by 650 and divide by the total load in watts. That may give you a rough idea of the maximum time under PERFECT conditions. i.e. starting from 100% state of charge with brand new batteries that have been cycled six to twenty-five times with the temperature at 25 C (77 f).
