Does the system need to store batteries, can it be used at night?

The system does not need to store the battery, all the electricity generated from the system will be consumed immediately. In case the load is not completely consumed, the excess electricity will be returned to the grid and transferred to other places. Therefore, the living (or production and business) will be free to use electricity from the solar energy on the day table and use electricity from the grid at night.

How do we know how much electricity has been saved when using the solar system?

According to statistics, each installed kW will produce about 3-4kWh/day (in the South) or 3 - 3.5 kWh/day (in the North). There are 2 ways to monitor. Firstly, we can install an electric meter at the output of the inverter, which will measure all the accumulated electricity that the màsolar system has produced. From there, the owner of the household (factory, business) will know how much he has saved. The second way, we attach a monitoring device with WIFI, this device will collect all operating data of the system and upload it to the website, the owner after setting up an account on the website can monitor operating parameters (output per day, month, year, peak capacity, ...) at any place via internet.

In cloudy, rainy days, is there enough electricity for daily use?

The living and production activities are not affected or interrupted in all weather conditions. In rainy and cloudy days, the amount of  solar power  will decrease according to the light intensity, then the grid will automatically mix in to supplement the lack of electricity, ensuring stable and continuous load supply.

How should the system be maintained and operated?

The system works completely automatically and the online monitoring system will continuously update the data for DAT engineers (and customer maintenance staff) to monitor and be proactive when there is a technical problem. However, customers need to regularly clean the panels to remove dirt on the surface, helping to improve light absorption to optimize the system's performance.

How long can the system work? How long to payback?

If there are no external factors (such as natural disasters, fire and explosion, lightning), the solar panel system can operate up to 30 years. In particular, the inverter system can operate up to 10 years before needing to be replaced. Therefore, with the current electricity price, the investment in a solar power system has the following payback period:

+ For manufacturing enterprises: about 5 years.

+ For commercial enterprises: about 4 years.

+ For family: about 5 years.


- Do not borrow capital (borrowing will be calculated according to loan percentage, interest rate).

How does the grid system work?

Technically, when the power grid goes out, the system will not be able to measure the parameters from the grid, so it will automatically stop working (even when it's sunny). With the current electricity infrastructure, the grid outage in cities is very limited, so it does not significantly affect the investment efficiency of the system.

How much does it cost to invest in a solar energy system?

The package investment rate for a “solar power system” ranges from 18 – 20 million/kW. This cost depends on the installation site, as well as the length of the cable systems from the solar panel system to the grid connection point. These costs will be calculated exactly after the engineer's field survey.

What coefficients should be considered when calculating the investment problem for the system?

Normally, DAT Solar's "solar power" project managers will assist customers with investment and financial analysis to find the right investment plan for their needs. The calculation of the investment problem needs to be accurate and objective with a full range of input coefficients including:
1.Average rate of electricity price increase per year: from 5 -7.5%
2.Inflation coefficient in Vietnam: about 7-8%/year
3. Depreciation of the system: 3%/year
4.Decrease in output: 0.8%/year

What are the advantages of a grid-tied solar power system compared to a battery-storage solar power system?

Because the system works in compensating with the grid, so it does not depend on the load capacity, users can comfortably live without worrying about being overloaded like when using the systemsolar energy battery storage. . At the same time, the system does not use batteries, so there is no need for periodic maintenance or battery replacement.

View more