No. If the load requires 168 W, then an 84 W inverter is not going to maintain the load.
The offline UPS is in standby mode. The charger is maintaining the battery, but the inverter stage is not running. Power goes from input to output, bypassing the inverter. In this configuration, the charger and inverter design is less, as the charger is usually in trickle mode and the inverter does not need to run continuously. On power fail, the inverter starts up and takes the load. There is a glitch in output, a few line cycles, but most loads can handle this. The online UPS runs all the time. The charger now runs the inverter, as well as maintaining charge on the battery. The inverter supplies the load. Power goes from input to charger to inverter to output. In this configuration, the charger and inverter design is more, as they need to run continuously. On power fail, there is no glitch, because the inverter is already running and supplying the load. Usually, there is synchronization between the inverter and the line, so that failure of the inverter can initiate fall-back to the line without glitch.
You do not need to use an external variable frequency drive for the said AC. You have mentioned that it is inverter AC. It means the AC is already fitted with a built in inverter. Even if you connect an inverter to the AC, you need another control device to control the VFD to control the speed of the fan/ compressor depending upon the room condition, external temperature, temperature setting etc. It is little complicated.
To prevent you backup Inverter from sudden overloading. You should manually control your Inverter. When power fails. Shut down all loads. Turn on your Inverter with a with no loads on the AC line. The slowly begin to turn on loads to your backup Inverter. Start with just the lighting systems and then work you way to higher current loads such as Air Conditioning Units. Another way to solve your problem is add maybe 5 additional Units in parallel. You need to calculate all the power loads in your house is using making sure your inverter can handle the complete load. Why the Inverter fails is due to high inductive loads. The Inductive loads appear as a short circuit to you Inverter. The only way around that problem is to limit the number of inductive loads the your Inverter is supplying power to.
type of inverter
No. If the load requires 168 W, then an 84 W inverter is not going to maintain the load.
The inverter draws little current on its own. It is the load that is connected to the inverter. If there were no load on the inverter you could use an ampmeter to determine the no load current. One thing to consider is that a higher wattage inverter would have larger gauge wire which is of lower resistance. This could make the no load current lower for the higher wattage inverter. Bottom line is you would have to measure or have a specification on the no load current.
"Online", as applied to inverters, means that the inverter is supplying the load in an operational state, i.e. "online". The inverter stage is running from the battery, floated from the rectifier, generating voltage, which is synchronized to the alternate source. Contrast this with "Offline" inverter, which means that the inverter stage is not running, or that it is in a standby state. In this case, loss of power causes the inverter stage to start, and to take the load. There is going to be a glitch in the output when this happens, usually of a few line cycles.
abt 1500watts
You need to find the wattage of the pump motor. This is found by multiplying the voltage of the motor by the amperage of the motor. Once you have this figure use it to find an inverter that can handle this wattage load at a 240 volt output.
"Rotary Inverter: In a rotary inverter, DC electricity input powers a DC motor that turns an AC generator. Rotary inverters are reliable and produce a pure sine-wave output. These inverters have automatic load demand: they begin operation once a load is activated, and shut down when the load is removed. Disadvantages of a rotary inverter are lack of frequency control, low surge capability (50% above maximum rating) and lower efficiency (50% to 80%). Rotary inverters are not as common as electronic inverters."
The voltage and frequency should be marked on the fan. This should match the voltage and frequency of the power coming out of the inverter. The inverter also has be capable of supplying anough power (in watts).
If we assume that the inverter is used in your car on 12 Volts DC and you are creating 120 VAC; and the 2500 watts refers to the AC side of inverter then for a resistive load Amps = Watts / Volts = 2500/120.
They are not compatible. You cannot connect any AC device to a DC battery without a inverter. The size of the inverter determines what it will run. And the wattage of the fan determines what size inverter to buy.
the trick is to find an inverter large enough to handle the load of a hot water heater, things such as water heaters, air condition units draw lots of electricity
The offline UPS is in standby mode. The charger is maintaining the battery, but the inverter stage is not running. Power goes from input to output, bypassing the inverter. In this configuration, the charger and inverter design is less, as the charger is usually in trickle mode and the inverter does not need to run continuously. On power fail, the inverter starts up and takes the load. There is a glitch in output, a few line cycles, but most loads can handle this. The online UPS runs all the time. The charger now runs the inverter, as well as maintaining charge on the battery. The inverter supplies the load. Power goes from input to charger to inverter to output. In this configuration, the charger and inverter design is more, as they need to run continuously. On power fail, there is no glitch, because the inverter is already running and supplying the load. Usually, there is synchronization between the inverter and the line, so that failure of the inverter can initiate fall-back to the line without glitch.
depends on your load...