Recently, Jiangsu and Guangdong province have enlarged the price difference between peak and valley: 2.0RMB to 2.1RMB during peak hours and 0.8RMB to 0.9RMB during valley hours, which suddenly opened to 1.2RMB/kWh. This means that the electricity price is cheap at night and expensive during the day. As long as the strategy is right, the profit space of buying low and selling high is very considerable. For a 1MW photovoltaic + 1MWh energy storage system, relying only on the time-of-use electricity price, it earns more 200,000 to 300,000RMB every year. 250,000RMB is no dream. CHIPSENSE will also be involved.

The operation idea is very simple
Midnight charging 
Usually from 23:00-7:00 the next day, the electricity price is only 0.8- 0.9RMB; the energy storage system is fully charged to prepare for the day.
Peak discharge
10:00 - 15:00 is the peak period, the electricity price is 2.0-2.1RMB; priority is given to self-use, not enough to sell to the power grid.
Intelligent scheduling
Combined with the weather forecast and the power load, the charging and discharging power of the energy storage and the MPPT point of the inverter are adjusted in real time to ensure that the system is always in an optimal state.

Let's do a calculation:
1MWh × (2.1 − 0.9) Technologies 1,200RMB/day, multiplied by 360 days Technologies 432,000RMB, deducting battery loss and operation and maintenance, the net increase is about 250,000RMB/year.

Core elements: accurate measurement + intelligent control
To achieve true "fool-like" time-sharing arbitrage requires two major underpinnings:

High precision current measurement
To precisely implement time-sharing strategies in complex multi-power supply and multi-energy storage systems, high-precision and full-coverage current detection schemes are indispensable. With years of accumulation in sensor technology, CHIPSENSE has developed a complete set of measurement products ranging from DC to AC, from strings to busbars, from energy storage batteries to grid-connected sides, achieving domestic substitution and facilitating the intelligent management of photovoltaic and energy storage integrated systems.

Application     Recommended model    Advantage
String branch/MPPT current    AN3V、AN5V    Small size; high accuracy (0.2%); DC offline measurement
DC Bus/Inverter Unit    AS1V、AN1V Series    Large current range (50A - 400A); low temperature drift, impact resistance
Energy storage battery current    AN3V    Compatible with 0-200A battery charging and discharging; small size, easy to embed BMS module
AC side current    CR1V、CS1V（≤100A）；
HS2V、HS3V（≤500A）；CM1A–CM5A Loop sensor    A、B、C full coverage; support high frequency harmonics; wide bandwidth

Intelligent Energy Management System (EMS)
Real-time access to electricity price signals, weather data, and load profiles
Dynamic scheduling energy storage charging and discharging, inverter operating conditions
Automatically generate reports to help operations teams calibrate and optimize in a timely manner.

As long as the measurement data is accurate and the decision-making model is flexible, the dividends of time-of-use electricity prices can be firmly grasped.

Landing Tips
Reserve enough range allowance
When selecting the model, leave an extra 10% to 20% of the range to avoid sudden large currents exceeding the measurement range.

Pay attention to the installation environment
Avoid high temperature and strong vibration areas to maintain sensor measurement stability.

periodic calibration
During the operation and maintenance period, check the measurement accuracy once a month to ensure that the data is consistent with the actual situation.

As long as you grasp the peak-to-valley price difference, combined with accurate measurement and intelligent scheduling, it is not an exaggeration to earn more 250,000 per year for 1MW photovoltaic + 1MWh energy storage systems. The policy window is limited, the sooner you layout, the more you can enjoy this wave of "buy low and sell high" income dividends.

(Disclaimer: This article is based on publicly available information and is intended for information sharing. It does not constitute any investment or application advice. Please refer to the official documentation or consult a professional for specific product selection.)

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