Just a few general comments here for people who don't have a strong electrical
Transformers can change the number of volts & amps from the input to the output. You can put 220vac 10 amps in & get 110vac 20 amps out (with a little loss) in the proper type of transformer. Amps & volts can change in the other direction too.
You can not change frequency with a transformer. If you put 50hz in, you will get 50hz out. If you put 60hz in, you will get 60hz out.
A transformer of the correct type can take in single phase 220vac or 480vac, etc & put out 110-0-110vac (aka a pair of 110vac circuits with a shared neutral). If you go from one hot of this output to the other hot of this output, you will have 220vac. This is standard US power configuration for use in houses & other typical civilian applications. Per NEC, the neutral gets connected to ground at the service
entrance only (in houses). After that, separate wires get run for neutral & ground. Depending on loading balance, it is not unusual to see several volts of potential difference between neutral & ground once you get far away from the service
You can not get 3 phase out of a transformer that takes single phase in as primary power. You can use only a single phase off of a 3-phase supply.
Some transformers can electrically isolate the primary from the secondary & have only magnetic coupling between the two. Other types of transformers (auto transformers, buck/boost transformers) have primaries that are electrically connected to the secondaries & provide no isolation.
Inverters vary in function depending on which one you have. Some inverters are capable of producing 50hz or 60hz ac power, depending on how they are programmed. Others are one-trick ponies & only put out a single frequency.
Inverters usually don't care what frequency the incoming power is. They should always put out what they are programmed to put out as long as they are working correctly, they are not overloaded & they have sufficient supply power.
Most inverter based units don't put out real sign wave power. This isn't a problem for 90% of the equipment
out there, but it can cause some issues with more sensitive equipment
& some other inverters if they are used in the same system.
Inverters tend not to like heavy motor
loads with high start currents or high voltage spikes. These are things that damage the output components of the inverters. If you plan to run motor
loads, it is often prudent to plan to oversize your inverter a little so that it will have the capacity to handle the high starting currents that motor loads normally produce (6 x rated full load amps at locked rotor).
You can usually run a 50hz motor on 60hz as long as you get the voltage right. It does not hurt the motor to do this. The motor will probably just run a little faster than it's nameplate RPM
. If you run a 60hz motor on 50 hz, you can burn the motor. Some motors are rated 50/60hz. Others are not.
Motor loads generally suck up 6 times the full load rated amps on their nameplate, when they start from a dead stop. This is called locked rotor current
or starting inrush current. A device called a soft starter can greatly reduce this inrush current, but makes the motor start up more slowly. A soft starter can greatly reduce the size of electrical
supply that you need to run a motor load.
If you bought a motor based device like an air conditioner or a refrigerator
in a country that has 50hz power, you can probably run it on 60hz power with no problems as long as the voltage is correct. The reverse is usually not true. US 110vac air conditioners generally do not last very long if you run them off of 50hz power that has been stepped down to 110vac with a transformer, even if the transformer was sized correctly to allow for the starting inrush current.
Putting Power Sources In Parallel:
DC in parallel
If you have multiple DC power sources of the same voltage, you can often put them in parallel with no problems. This is sometimes not true of chargers. Some smart chargers will have complicated sensing circuits that will not play well with other chargers that are put in parallel. You can put as many batteries as you want in parallel, as long as the voltages are the same.
AC in parallel
Do NOT put multiple AC sources in parallel unless you have special matching equipment. If you don't know what that equipment is, then don't even try it.