48v solar charge controller manufacturers tell you that in the process of using solar charge controllers, there are several voltages that must be understood.

1. The high voltage protection voltage is to prevent overcharging of the battery, generally 15.5V. Some controllers do not have this function, or this function fails, and the result is that the battery is bulged and even fails.
2. The low-voltage protection voltage is the voltage set to prevent over-discharge of the battery. Usually at 11V. The 48v solar charge controller manufacturer tells you that if it does not have this function, or the precision of the components is not enough, the battery will be over-discharged. Usually, the voltage of the battery is lower than 5V, it is difficult to recharge it, and the battery will be scrapped.
3. Recovery voltage, which means that after the low-voltage protection of the controller, it needs to recover to a certain voltage value to work normally, usually the voltage is 12.5V, if the low-voltage value is not reached, the controller cannot automatically resume to work.
The manufacturer of 48v solar charge controller tells you that some people usually ask us for a longer battery life, the low voltage protection voltage of the battery is 11V, can you help me adjust it lower, such as 9V, so that our battery will last longer . The answer we gave was no. Because the 11V voltage point is the limit where the battery uses about 70% of the power. The 48v solar charge controller manufacturer tells you that if you lower the voltage, it will cause the battery to run in a state of power loss for a long time, which will affect the life of the battery. All of our low-voltage protection, high-voltage protection, and recovery voltage values ​​are usually not changed according to customer requirements.