When we plan to install a solar system for our house, which aspect should we consider to make it more suitable and economical? This article will provide you with some useful advice for your solar system configuration

The main points before system configuration:

1/ Why need a high-performance solar system?

2/ How to choose the inverter? (Types of solar system you need)

3/ How to calculate the battery kWh required and choose a suitable lithium battery

Why need a high-performance solar system?

The structure of a solar system is relatively simple, with the main components including solar panels, inverters, and batteries. If sufficient solar panels are considered during the preliminary design of the system, the entire photovoltaic system can be self-sufficient. Considering the actual usage scenarios of energy storage, the charging and discharging current of the battery is not very high, so the actual lifespan of a solar system is generally 10-20 years. This is also why we need to choose high-quality solar products from the beginning to effectively avoid maintenance costs in the later stage.

How to choose the inverter?

As the backbone of the solar energy system. During the day, the solar panel converts the DC power generated by the inverter into AC to supply the household load. If there is excess power, the battery can be charged through the inverter to store the energy.

At present, there are three types of inverters for different types of systems, namely grid-tie systems, off-grid systems, and hybrid systems. Among them, grid-tie systems are a kind of solar system that can't configure backup batteries. ( Unless an AC-coupled inverter is purchased on the basis of the original system, the connection of the backup battery can be realized). Off-grid and hybrid systems need batteries for energy storage applications.  Compared with off-grid solar systems, hybrid systems with it's advantages in that with higher solar efficiency and support feedback power to the grid.

If you are looking for a hybrid or off-grid system, it's recommended to choose the inverter power according to the UPS(load) power.

How to calculate the battery kWh required and choose a suitable lithium battery

The main function of batteries is to effectively help people slash electricity bills. Because it can store the surplus electricity generated by solar energy during daylight hours, people can use it at night and reduce electricity costs. At the same time, you can set the time period when you want to use batteries to effectively adjust electricity expenses: for example, prioritizing the use of battery discharge to power household loads during peak time, charging batteries during low electricity consumption periods, or using solar energy to charge batteries

There are two factors that need to be considered before choosing lithium batteries:

1/ Backup hours at night (the time that the battery needs to discharge to the load)

2/ Emergency load power at night (Sum of the total power of emergency loads)

These two data will help you effectively calculate the total battery kWh required, and then combine the system voltage and battery model to select the appropriate battery

At present, the three most popular battery series for home energy storage are mainly the Powerwall series, 15kwh Powerwall, and the Stackable battery.

All of these three series are lithium iron phosphate batteries, Which cover 5, 7, 10, 15, and 20 kWh model selection and their safety and longevity are at the forefront of the industry.

Meritsun is one of the leading battery manufacturers in China with more than 24 years of production experience. We are ready to provide you with high-quality solar batteries and systems and always, warmly welcome your visit and trial order!

By Iris

MeriTech Power Limited

export-12@meritsunpower.com