The selection of solar inverters requires comprehensive consideration of various factors:
Power Matching: The rated power of the inverter should be slightly higher than the maximum power of the solar panels. For example, for a 5kW solar panel, an inverter with a rated power of 5.5 - 6kW can be selected. Its peak power needs to meet the starting requirements of high-power electrical appliances, generally being 1.5 - 2 times the sum of the starting powers.
Conversion Efficiency: The conversion efficiency of high-quality inverters is between 95% and 98%. The higher the efficiency, the more electrical energy output, and the better the power generation benefits.
Input and Output Characteristics: The input voltage range should be wide to adapt to the fluctuations in the output voltage of the panels. Select the output waveform according to the requirements of the electrical appliances. For equipment with high requirements for power quality, a sine wave inverter is needed.
Safety Performance: It is necessary to have overcurrent, overvoltage, and leakage protection functions to prevent equipment damage and safety accidents caused by abnormal current, abnormal voltage, and leakage.
Communication Function: Inverters with communication functions are convenient for remote monitoring and management. They allow for real-time viewing of operation, power generation data, and fault information, and also enable remote parameter setting.

The charging time of lead-acid batteries is closely related to their service life:
If the charging time is too short, it will cause the battery to be undercharged, leading to the sulfidation of the active substances, reducing the battery capacity, and shortening the cycle life.
If the charging time is too long, it will accelerate the aging of the plates, cause water loss in the battery, and even trigger thermal runaway, thus affecting the battery performance and shortening the service life.
An appropriate charging time is crucial. After the battery is completely discharged (100% power consumption), the charging usually takes 8 to 10 hours and should not exceed 12 hours. When the battery has about 70% of its power remaining, the charging time is approximately 6 to 8 hours. After the charger indicator turns green, a floating charge for an additional 0.5 to 1 hour is advisable.

Lead-acid batteries and lithium batteries differ in several aspects. In terms of materials, lead-acid batteries consist of lead, its oxides and sulfuric acid electrolyte, while lithium batteries use lithium metal/alloy as the negative electrode and various materials like lithium cobaltate for the positive electrode with organic or polymer electrolytes. Lithium batteries have higher energy density and charge-discharge efficiency, as well as a longer cycle life compared to lead-acid batteries. Lead-acid batteries are relatively safer but the sulfuric acid in them is corrosive. Lithium batteries have safety risks if misused but safety has improved. Lead-acid batteries are cheaper, and lithium batteries are more expensive but the cost is decreasing. In terms of environmental friendliness, lead-acid batteries contain harmful heavy metals and need proper recycling, while lithium batteries are relatively more eco-friendly but also require reasonable recycling.

The article describes the process of producing and delivering 100 units of 60KVA industrial frequency machines. These machines, meticulously designed and rigorously tested, carry significant energy and are intended for use in various factories and enterprises to support production and ensure power supply. Their production and delivery reflect a commitment to customers and demonstrate the company\'s craftsmanship and innovative spirit. In the future, the company will continue to provide even higher quality power solutions.