Using Parallel Inverters to Create Expandable Solar System

paralleling inverter to create an expandable solar power system

Solar panels are becoming more efficient and cost-effective, making it easier for homeowners and businesses to utilize solar energy. However, as the demand for electricity increases, the scalability of a solar power system becomes one of the factors that should be considered even before installation.

In this article, we will explore how to create an expandable solar system with a focus on the concept of a parallel inverter, the advantages of using one and how to connect inverter in parallel. We will also discuss the feasibility of over-sizing solar inverters for expanding solar energy systems, helping you make the most of your solar power investment.


Can I connect 2 inverters in parallel

First, make sure that your inverter has parallel operation capability, as not all inverters support parallel operation. Parallel inverters need to exchange data between each other to coordinate their output and monitor performance to ensure they can work together.

Therefore, you need to choose an inverter that is suitable for this purpose, and the user manual typically clearly indicates its support for parallel operation.


What is Parallel Inverter

A parallel inverter is a device that allows multiple inverters to work together in unison, essentially combining their outputs to meet the power demands of your home or facility.

This relies on the communication between parallel inverters, which is typically achieved through a shared communication bus, such as Ethernet or RS-232. This bus facilitates data exchange, allowing inverters to synchronize and monitor each other's performance.

They use standardized communication protocols such as Modbus or CAN. Data transmitted includes power output, voltage, current, and operating status. Inverters need to work together, ensuring they produce power at the same frequency and phase.

In addition, different inverters may utilize different parallel operation control technologies, so it's vital to follow manufacturer guidelines during installation for correct communication parameter settings and hardware choices.


Advantages of Parallel Inverter

  • Increased Power Output
    One of the primary benefits of parallel inverters is the ability to increase your solar system's power output. When you connect multiple inverters in parallel, the combined power capacity of your system multiplies, making it a cost-effective solution for larger energy demands.
  • Optimized Performance
    Parallel inverters can optimize the performance of your solar panels. They allow you to connect panels of different orientations and angles without affecting the overall system's efficiency. This flexibility ensures that you make the most of your available space.
  • Easy Scalability
    One of the most significant advantages of parallel inverters is their scalability. You can start with a small system and expand it gradually as your energy needs grow. This adaptability is particularly useful for residential and commercial users.


PowMr Parallel Inverters Compare Llist

POW-SunSmart SP5K POW-Sunsmart LV12K POW-SunSmart 10KP POW-HVM6.2K-48V-LIP POW-MAX 8KW
Nominal Power (Per Unit) 5000W 10000W 10000W 6200W 8000W
AC Output 110Vac/220Vac Split-Phase 110Vac/220Vac Split-Phase 110Vac/220Vac Split-Phase 220Vac 220Vac
DC Output 48Vdc 48Vdc 48Vdc 48Vdc 48Vdc
Max Parallel Unit 6 Units 6 Units 6 Units 12 Units 6 Units
Max Output Power (in Parallel) 30kW 60kW 60KW 74kW 48kW
Phase (in Parallel) Single Phase, Split Phase (120V/240V), 208Vac (P-P) Single Phase, Split Phase (120V/240V), 208Vac (P-P) Single Phase, Split Phase (120V/240V), Three Phase 208Vac (P-P) Single Phase, Three Phase Single Phase, Three Phase
Time Slot Charging & Discharging Control Yes Yes Yes No No


How to Creat an Expandable Solar System

An expandable solar system may be right for you if you want to reduce reliance on the grid and cut your carbon footprint.

To achieve scalability in a solar power system, there are two viable approaches. You can either invest in parallel inverters or opt for a high-capacity solar inverter during the initial assembly of your solar power generation system.

By comprehending and applying these strategies, you can establish an adaptable solar system that not only satisfies your energy requirements but also presents the opportunity for enduring cost savings and reduced environmental impact.


Invest in a Parallel Inverter

Instead of an expensive full solar setup, you can start on a small scale, purchasing inverters that support parallel connections, and then expand your solar system later. Benefits include less planning, flexibility in installation locations, and the ability to stay within your budget. Initial planning for a full system involves detailed research and finding the right installation company.

Choosing a small expandable system simplifies planning and decision-making. You can start with a few panels, gradually invest more without straining your budget, and select installation locations beyond your roof, preserving aesthetics.

Whether you're looking to power your entire home or start with a smaller setup, PowMr's expandable solar systems (220Vac 48Vdc),complete with all the necessary installation accessories, offer a convenient, budget-friendly solution. These kits are designed to provide you with an efficient and cost-effective solution for your energy requirements. With the option to start small and expand as needed, you have the flexibility to tailor your solar system to your unique needs.


PowMr Inverter Parallel Kits Expandable solar system SYS-POW-HPM6.2KW-LIP*2 SYS-POW-HPM6.2KW*4
Price $6,699.00 USD $12,999.00 USD $21,999.00 USD
Total Power
(Expandable up to 74kW)
6200W 12400W 24800W
Expandable Capacity 67.8 kW 61.6 kW 49.2 kW
450W PERC Solar Panel 12 pcs 24 pcs 48 pcs
6200W 220Vac 48Vdc All In One Inverter Charger 1 pc 2 pcs 4 pcs
200AH 48V LiFePO4 Battery 1 pc (9.6KWH) 2 pcs (19.2KWH) 4 pcs (38.4KWH)
PV Tools & Cable 1 set 1 set 1 set


Get an Oversized a Solar Inverter

Properly oversizing an inverter allows for more flexibility in adding additional solar panels or expanding the system without the need for inverter replacement. This can be highly advantageous if you anticipate an increase in energy consumption.

However, it is generally recommended to match the inverter size with the capacity of the solar panels to ensure optimal performance and efficiency. This is because if the solar panel array consistently generates power below the minimum operating threshold of a large inverter, its operational efficiency may decrease, leading to a reduction in energy conversion efficiency.

Oversize inverters may not fully harness the potential of the solar panel system. During periods of low solar irradiance or partial shading, large inverters may fail to extract the maximum power output from the panels, resulting in energy production losses.

Therefore, to determine the appropriate inverter size for your specific solar panel array and energy requirements, it is advisable to consult with a professional solar system designer. They can conduct a comprehensive analysis, taking into account factors such as system efficiency, cost, and future expansion plans, to provide the best possible recommendations.


How to Connect Hybrid Inverter in Parallel - Diagram & Video Tutorial

You can connect 2,3 or more inverters in parallel, provided you stay within the specified limit.Please refer to the correct connection procedure in the user manual and make sure to accurately distinguish between phase, live wire, and neutral wire.


Diagrams for connecting inverters in parallel

Here are the diagrams for the parallel connection of inverters, using the POW-HVM6.2K-48V-LIP as an example.

how to connect hybrid inverter in parallel - diagram1

how to connect hybrid inverter in parallel - diagram2

how to connect hybrid inverter in parallel - diagram3

In addition, refer to the manual for using the correct communication cable to connect the inverters, ensuring that parallel inverters can exchange data with each other.

example parallel inverter communication port

Video Tutorial - How to Connect Inverters in Parallel (POW-HVM5.5K-48V-P)

In this video, we will demonstrate how to parallel 3 inverters (POW-HVM5.5K-48V-P) and perform parallel operation.

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