is it possible to connect esp8266 to a solar charge controller to measure the voltage and current? Is it necessary to use voltage and current sesor?
An INA219 is inexpensive. 
You can measure voltage via an analog pin. You will likely need to reduce the voltage via a voltage divider circuit like this, so that Vout is less than 3.3v.
You can't measure current directly, but you can pass through a low value resistor (often called a shunt resistor) and then measure the voltage across the resistor to determine the current.
You can also use a specific sensor... something like this....
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