FTS series solar inverter range from 1kw to 6kw
Battery knowledge：
Internal resistance
The internal resistance of a battery refers to the resistance to current passing through the interior of the battery. It includes ohmic internal resistance and polarization internal resistance, and polarization internal resistance includes electrochemical polarization internal resistance and concentration polarization internal resistance. Due to the existence of internal resistance, the working voltage of the battery is always less than the electromotive force or open circuit voltage of the battery. The internal resistance of the battery is not constant, and it keeps changing (gradually increasing) with time during the charging and discharging process. This is because the composition of the active material, the concentration of the electrolyte and the temperature are constantly changing. Ohm's internal resistance obeys Ohm's law, and the polarization internal resistance increases with the current density, but it is not a linear relationship. It usually increases with the current density.
Internal resistance is an important indicator that determines battery performance, it directly affects the battery's operating voltage, operating current, output energy and power. For batteries, the smaller the internal resistance, the better.
impedance
The battery has a large electrode-electrolyte interface area, so the battery can be equivalent to a series circuit of a large capacitor and a small resistance and inductance. But the actual situation is much more complicated, especially the impedance of the battery varies with time and DC level, and the measured impedance is only valid for the specific measurement state.
Charge and discharge rate
Sometimes there are two representations of rate and magnification. The hour rate is the charge and discharge rate expressed by the charge and discharge time, and the value is equal to the number of hours obtained by dividing the rated capacity of the battery (Ah) by the specified charge and discharge current (A). The rate is another representation of the charge and discharge rate, and its value is the reciprocal of the time rate. The discharge rate of the primary battery is expressed by the time it takes to discharge through a fixed resistance to the termination voltage. The discharge rate has a great influence on the battery performance.
life
Shelf life refers to the maximum allowable storage time, measured in years, between the time the battery is made and the start of its use. The total period, including the storage period and the use period, is called the validity period of the battery. The life of the storage battery is divided into dry storage life and wet storage life. Cycle life is the maximum number of charge and discharge cycles that a battery can achieve under specified conditions. When specifying the cycle life, the system of the charge-discharge cycle test must be specified at the same time, including the charge-discharge rate, the depth of discharge and the ambient temperature range.
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