I am doing a project on automation of the Mixing Mc. In the existing Mc, 1 HP AC Single phase induction motor is used for this purpose. I have planned to replace with 1 HP DC Motor with the Battery and inverter to use this mc even during the Power cut times. NOw i require the clarity on the Battery Specifications - 12V or 24 V can be used for his purpose. Required Torque would be 4 Nm 1500 RPM. Pls guide me in proceeding further.
I don't know the meaning of Mc. 24 volts or more will be preferable to 12 volts, except the 12 volt inverter will likely be less costly for an inverter surge ratted 4000 watts or more. A suitable 1500 RPM 1HP dc motor will likely cost more than the inverter, so likely it will be less costly to not replace the AC induction motor. Worse the dc motor may not fit and the shaft is likely a different size. If you buy 4 large 6 volt deep cycle batteries that weigh about 100 pounds each, connected in series provides about 250 amp hours at 24 volts. I suspect the 1500 watts in the other answer is not correct: 30 amps will be the average current drain of your mixer, so more than 7 hours of mixing time between full charges of your battery bank risks battery damage. Likely you can use a smaller battery, but running time, and battery life will be much reduced , and the inverter (or dc motor protection circuits) may shut its self off when the dc input voltage drops about 20% during the starting surge that the motor will require. This is especially true when the battery is near the end of its useful life. Neil
1 Hp Dc Motor Specifications
One horsepower is equal to 746 Watts; in reality, however, a 1 hp AC induction motor draws 1500 Watts at 1 hp load. If you use a DC motor, you would connect batteries in series. If you are designing uninterruptable power for an AC motor, the requirements are formidable. First, you need an inverter capable of 1500 Watts comtinuous and 9000 Watts starting surge. Second, at 12 Volts the battery will have to supply 150 Amperes. A back-up supply of this size is not practical as opposed to a standby generator. A suitable inverter will be expensive (if available). The actual battery requirement would be several hundred Ampere Hours of capacity for every 20-30 minutes of operation.
