An UPS typically includes the battery and battery charger in one stand-alone unit. The input voltage window for UPS is comparatively less than that of inverter . However, there are UPS systems that use external batteries, and Power Stream makes inverter s with battery chargers, so the differences blur as features proliferate. .

Square wave inverter s are the pioneers of inverter development. Square wave inverter s just flip the voltage from positive to Negative creating a square wave form. At present most of the inverter consumers majorly use square wave inverter s for their household purposes. It is also very cost effective than other types of inverter .

If you connect a 850W coffee machine to a sine wave inverter , consumption will be 850W divided by the voltage of the electrical system (12V) = 70 Amperes. Add another 8% (100%-92% =8%) to this total for the inverter consumption. The total power consumption is then 70 Amperes + 6 Amperes = 76 Amperes. Of course a coffee machine is only in use for about 10 minutes so the actual Ampere consumption is relatively low (76 x 10 min = 13Ah).

For longer life of battery and better performance, you should pour the battery grade water into the battery after every 2 to 3 months.