The ordinary solar controller is the first generation technology. The working principle is to directly connect the output of the solar panel to the battery port. When the battery is full, it will be disconnected. Because of the internal resistance of the battery, it is difficult to fully charge the battery, and the solar panel If it is not fully utilized, the charging conversion efficiency is only 70-76%, which has been eliminated by the market and is basically used by few people.

PWM solar controller is the second generation technology, which is the most on the market now. The working method is PWM control. Compared with ordinary solar controller, it has improved a lot and can solve the problem of battery dissatisfaction. The charging conversion efficiency is 75-80%. , but the solar panels are not fully utilized.
The PWM solar controller has overcharge protection: when the charging voltage is higher than the protection voltage, the battery will be automatically turned off to charge the battery. After that, when the voltage drops to the maintenance voltage, the battery will enter the floating charge state. When it is lower than the recovery voltage, the floating charge will be turned off and enter Equal charging state. Load overcurrent and short-circuit protection: After the load current exceeds 10A or the load is short-circuited, the fuse is blown, and it can continue to be used after replacement.