In the solar power system, the solar inverter is the core hub of solar, mains and battery, and undertakes the key tasks of energy conversion, scheduling and storage. In terms of usage scenarios, solar inverters can be divided into three types of solar inverters: off grid inverters, on grid inverters and hybrid inverters. The hybrid solar inverter is a hybrid and complementary solar inverter that can be powered by solar + mains + battery. So how many charging modes does hybrid solar inverter have? How to choose the charging priority? Below, Xindun will introduce the charging mode and charging priority of the hybrid solar inverter.
As one of the core functions of the inverter, the charging priority setting of the hybrid solar inverter directly determines the distribution strategy of solar and mains energy, and has an important impact on system efficiency, electricity cost and battery life. Usually, hybrid solar inverters provide three charging priority options. For example, Xindun HFP-C/HFP-E/HFP-S/HFP series hybrid solar inverters provide "SNU" solar + mains charging at the same time), "OSO" (solar charging only), "CSO" (solar priority charging) three charging priority options for users to charge in different application scenarios.
Introduction to hybrid solar inverter charging priority
When solar and mains are available at the same time, solar is used first to charge the battery. Only when solar power is insufficient, the mains supplements the remaining charging demand. When there is no solar, the mains alone undertakes the charging task. For example, when the battery needs 50A charging current, solar provides 30A, then the mains supplements 20A; if solar provides 60A charging current, which exceeds the charging demand of battery current, only solar charging is used, solar is consumed first, and the mains does not intervene.
The "SNU" option of the charging output stage of the hybrid solar inverter is a common charging mode that takes into account both economy and stability. It is suitable for areas with sufficient solar resources, such as rural and suburban areas with long sunshine hours, which can maximize the use of solar power, reduce mains consumption, and reduce electricity costs. In scenarios where the load is stable and the mains electricity price is high, such as commercial complexes and household users, solar give priority to meeting charging needs, and mains only serves as a supplement to balance load and energy storage efficiency.
The inverter completely relies on solar to charge the battery, and the mains charging function is forcibly disabled. If solar is not available (such as at night, rainy weather), the battery cannot be charged, and manual intervention is required to switch to other charging priority output level options. For example, regardless of whether the battery is out of power or not, as long as solar is not working, the mains will never participate in charging, and the system enters the "solar charging only" pure green energy mode.
The charging output level "SNU" option of the hybrid inverter is a pure green charging strategy that relies only on solar. It is only enabled in extreme scenarios with zero dependence on mains, such as remote off grid independent power supply systems or project scenarios with strict environmental protection requirements, such as ecological protection areas, scientific research equipment, etc., completely prohibiting the mains from participating in the charging process, strictly relying on renewable energy, and meeting the "zero carbon" energy needs.
Solar prioritizes charging needs. When there is no Solar available (such as at night, solar failure), the mains starts charging. After the solar is restored, it will automatically switch back to solar charging and the mains will stop working. For example, when the solar is working normally during the day, the solar will be used for charging first, regardless of whether the power is sufficient or not; in the evening, when the solar power is lower than the threshold, the mains will automatically take over the charging. The solar will be restored in the early morning of the next day and the mains will exit.
The "SNU" option for the charging output stage of the hybrid inverter is an optimal mode for balancing efficiency and flexibility of the solar power system. It is suitable for areas with medium solar resources, such as cities with medium sunshine duration. While ensuring battery charging, it avoids wasting power when the solar is available, such as when the solar is sufficient only in some periods of time. It is also suitable for use in scenarios where the peak and valley differences in the mains electricity prices are large. With the solar charging during the day, the mains will not be charged during the valley period at night (the battery capacity setting must be combined), which further optimizes the electricity cost.
The three charging priorities (SNU/OSO/CSO) of the hybrid solar inverter allow users to achieve efficient coordination between solar and mains through sophisticated energy scheduling strategies:
"SNU" charging mode: a general choice, balancing the utilization of solar and the supplement of mains, suitable for most scenarios.
"OSO" charging mode: Pursuing a dedicated strategy for pure green energy or off grid scenarios, adhering to the principle of pure solar charging.
"CSO" charging mode: solar priority, mains power backup, while ensuring charging while minimizing electricity costs.
Users can flexibly configure charging strategies based on actual needs, combined with sunshine duration, battery type and local power supply. Through reasonable settings, hybrid solar inverters can not only improve the efficiency of solar power systems, but also adapt to a variety of application scenarios. The three charging priorities of the hybrid inverter upgrade the solar power system from "passive power supply" to "active scheduling", allowing users to find the optimal charging solution in the synergy of solar and the power grid.
