In recent years, the National Energy Administration has proposed the "Hundreds of Thousands of Households Basking Light Action" to encourage ordinary people and small and medium-sized enterprises to install photovoltaics on rooftops, promoting the rapid sinking of distributed photovoltaics to urban and rural rooftops. In March 2025, the National Energy Administration issued the "Notice on Further Organizing and Implementing the" Thousands of Households Basking Light Action ", which pointed out that it is necessary to guide the local consumption of rural distributed photovoltaics and attach great importance to the operation and maintenance of rural distributed photovoltaic power generation projects.

Rooftop photovoltaics may cause fires or electric shocks due to proximity to people, aging lines or equipment failures. Rural rooftop photovoltaic power generation is digested first, and excess is integrated into the power grid. How to ensure the safe and stable operation of inverters under the conditions of low-cost operation and maintenance in rural areas has become the focus of the industry. CHIPSENSE also focuses on this point.

Distributed photovoltaic inverter
A photovoltaic inverter (PV inverter or solar inverter) can convert the variable DC voltage generated by photovoltaic (PV) solar panels into a household/commercial mains frequency alternating current (AC) inverter. This electricity can be used for its own use or integrated into the grid.

Why do distributed inverters need current detection and the challenges they face?
To convert direct current into alternating current, an inverter must know precisely how much the input direct current is, because the power generation efficiency of photovoltaic panels varies with light and temperature. The photovoltaic inverter "finds" the point that can generate the most electricity in real time through MPPT (maximum power point tracking) to improve power generation efficiency. Therefore, the current is uncertain, the MPPT will fail, and the power generation will be less. Due to the fixed orientation of the roof distributed photovoltaic, it is vulnerable to shadow occlusion, and climate change and other factors, the output current has the characteristics of large fluctuations and strong harmonic interference, which puts forward higher requirements for the current detection of the inverter.
An efficient and reliable inverter requires accurate current sampling, which requires the current sensor to have a wide dynamic range, high anti-interference ability, and isolation detection ability. To cope with the fast switching from sunny to cloudy, full to low hair, and to resist the electromagnetic interference caused by the internal switching frequency of the inverter. The following are some scheme comparisons:

Comparison of the three major solutions:
 

CHIPSENSE AN3V current sensor recommended installation and deployment location
AN3V of CHIPSENSE can be installed and deployed in the MPPT control link and grid-connected detection link to help the inverter achieve efficient and stable operation.
1.In the MPPT control node, 5.75mV/A high sensitivity can capture weak current changes and improve power generation efficiency in rainy days; 4.8mVRMS ultra-low noise to avoid false triggering MPPT adjustment.The design of CHIPSENSE is suitable for using.
2.At the exit of the bus box (connector), after the DC telegraphic transfer of multiple groups of photovoltaic panels, it must pass through here and then enter the inverter. CHIPSENSE AN3V current sensor has to monitor the total current in real time. Once it exceeds the safety threshold (such as ± 450A), it will immediately trigger protection to avoid line overload and fire. CHIPSENSE product requirements must take into account the safety of customers.

Introduction to AN3V current sensor from CHIPSENSE

AN3V PB35/55 series is a brand-new open-loop hall current sensor product specially built by CHIPSENSE for high-current detection scenarios.

This series of products precisely focuses on the power supply, photovoltaic, energy storage and other industries, and is deeply in line with the high reliability and high performance of current measurement in these field. The demanding requirements of consistency. The new CHIPSENSE AN3V series current sensor mainly includes CHIPSENSE AN3V PB35/PB55 and other models current sensors, covering the rated measurement range from 80A to 200A. Not only does it ensure measurement accuracy, CHIPSENSE but also greatly improves the dynamic measurement range, reliability and excellent linearity.

Characteristic
Open loop current sensor based on hall principle
Insulation between primary and secondary sides
Raw materials comply with UL 94-V0
No insertion loss
Power supply voltage: + 3.3V
Height h = 8.7mm
Execution standards:
IEC 60664-1:2020
IEC 61800-5-1:2022
IEC 6 2109-1: 2010

Parameter characteristics:
Power supply: + 5V/3.3V
Rated range: ± 80~ 200A
Measuring range: ± 80~ 375A
Working range: -40~ 105 ° C
Typical Accuracy: 1%
Response time: 2.5 μs
Insulation voltage: 4.3kV
Bandwidth: 250kHz
Linearity: 0.5%

Dimensions:

Conclusion:
The "Muguang Action for Thousands of Households" has pressed the fast-forward button for the development of distributed photovoltaics, and also put forward higher requirements for the monitoring and protection of inverters. Excellent domestic sensors like AN3V of CHIPSENSE current sensors have become the technical cornerstone for the stable grid connection of distributed inverters due to their high-precision stability, high-voltage isolation, wide dynamic range, and anti-interference design. CHIPSENSE has been constantly evolving.

CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies. CHIPSENSE is committed to providing customers with independently developed sensors, as well as diversified customized products and solutions.

“CHIPSENSE, sensing a better world!

www.chipsense.net