Inverter Cannot Output Effectively? Come Check It Out
Some customers have reported that the output of the inverter is limited and cannot be effectively output. After in-depth communication, it is understood that there are problems in the configuration of its inverter and components: too many components are over-configured, resulting in excessive working current part of the time, the inverter runs with current limit, and some power limit phenomenon occurs. So how do you check for the problem?
(1) Have you added a "protective cover" to the inverter?
The customer installed a protective cover to protect the inverter, but this not only did not protect the machine, but also affected the heat dissipation of the machine. Especially in the hot summer, installing the protective cover can easily cause the temperature of the surrounding working environment to be too high, resulting in overheating and derating of the inverter, limiting the output power, and affecting the power generation income.
The right way:
String inverters are all IP65 or above, and do not require additional overall protection. Therefore, we only suggest two points here. First of all, when installing the string inverter, some protective roofs can be installed on the upper part to avoid direct rain. In addition, when installing multiple string inverters, pay attention to the spacing between the inverters to ensure sufficient cooling space, and follow the installation manual recommendations as much as possible.
(2) Are you pairing too many components?
If your inverter's maximum output power is 5.5KVA, even if the input side inputs 6kw of power, its output will not reach 6kw, but only 5.5kw at most, which limits the output power. Considering the impact of system losses, we usually recommend different overprovisioning ratios in different regions. Because, if the inverter is overconfigured too high, it will not only waste the system cost, but also make the inverter overload for a long time, resulting in a reduced service life.
(3) Does the current combine through the DC combiner box?
We all know that the centralized inverter will add a combiner box on the DC side. It is mainly to connect the components of the square array in series and parallel, and add protection devices such as lightning protection, fuses, and DC switches, and then connect them to the DC cabinet side of the inverter.
For string inverters, the DC combiner box is directly omitted, and the lightning protection and overcurrent protection units are placed in the machine, thereby greatly reducing the workload of construction and maintenance.
Error: The number of DC terminals on the input side of the inverter directly determines how many power components can be configured. Some customers ignore the current limiting conditions on the input side, and connect the components in parallel before connecting to the inverter, which leads to excessive input current and burns the fuse, and even damages the terminals, which affects the power generation income.
Correct: The power on the input side of the inverter needs to be fully considered, i.e. the current limit. Generally, the maximum input current of the module is about 9-10A, and the double-sided module is slightly larger, only about 11-12A, and the current of the DC input side of the inverter is mostly about 12.5A, so special attention should be paid to the configuration.
