The Ultimate Guide to Choose Batteries for Inverter

Planning to buy a storage battery? You might have heard and be confused: what exactly are AGM batteries, Gel batteries, lithium batteries, lead-acid batteries? What are the differences between them?

This article will revolve around how to select solar batteries for inverter including types and size.

Quick Navigation

What is the Function of a battery for inverter in solar power system?

Generally speaking, batteries in the solar power system are an indispensable parts, as they allow us to store the excess electricity current generated by solar panels for later use.

The battery for inverter plays a role of backup power in case of grid failure, power outage or low sunlight conditions. It can supply electricity to the appliances and devices connected to the solar power system, as well as feed electricity back to the grid if the system is grid-tied.

The battery for inverter optimizes the efficiency and performance of the solar power system by balancing the supply and demand of electricity. It can charge the battery when the solar panels produce more electricity than the load requires, and discharge the battery when the load requires more electricity than the solar panels can produce.

The battery for inverter can also reduce the electricity bills and the environmental impact of the solar power system by using renewable and clean energy from the sun.

Types of solar batteries for Inverter

There are two common battery for inverter, lithium battery and lead-acid battery.

Lithium Battery for Inverter

Lithium battery is light weight, high energy storage, no pollution, long service life, driven by sustainable development, it will become increasingly popular. There are several lithium battery cell types, LiFePO4 battery, Li CoO2, LiNiMnCoO2/NMC.

SVC LiFePO 4/LFP Battery:

LiFePO4 battery the hottest choice for inverter among these three battery cell types. BMV LiFePO4 battery has a long service life, more than 6000 cycles, 100A continuous discharge current, and wide operating temperature range. Compatible with Smart VMH off-grid solar inverter.

SVC Lithium Battery for Inverter

Lead-acid Battery for Inverter

Lead-acid batteries have low energy density, short cycle life, and slow charging time compared to newer types of batteries, but they are also cheap, durable, and easy to maintain.

Valve-regulated lead acid battery

Valve regulated sealed lead-acid battery, also known as maintenance-free battery, is divided into two types: AGM and GEL battery.

SVC AGM Battery for Inverter

SVC AGM Battery for Inverter
12v deep cycle battery for inverter

What size batteries are needed for you inverter?

If you want to add the extra batteries for your inverter, please follow our steps to calculate what size batteries do you need for your inverter.

The size of the batteries needed for your inverter depends on the capacity and output of your inverter, the runtime and consumption of your load, and the voltage and depth of discharge of your batteries.

Firstly, calculate the total load consumption as per the formulate

Total Required Power = total load + Inverter rated power x (1- Inverter Efficiency)

For example, you have the existing 3000W inverter with 98% efficiency,

Total Required Power = 3000W + 3000W * (1 – 0.95) = 3150W

Secondly, confirm the battery rated voltage which should compatible with the inverter and matches the system voltage

Battery Capacity(kWh) = Total Required power x Runtime (h) / Depth of Discharge

Assuming the selected battery has a rated voltage of 48V and a depth of discharge of 80%. Battery backup time is 4 hours

Required Battery Capacity (kWh) =3.15 kW × 4 hours / 0.8 = 15.75 kWh

Thirdly, to converter kilowatt hours into ampere hours, you should divide the kilowatt hours by the voltage and then multiply the result by 1,000.

Required Battery Capacity (Ah) = 15.75 kWh * 1000 / 48V ≈ 328.125 Ah

Best Battery with Inverter for Home Kits

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top