What an inverter actually does
Solar panels produce direct current (DC) electricity. Your home, and the grid, run on alternating current (AC). The inverter's core job is to convert DC to AC so the power is usable. But a modern hybrid inverter does much more:
- It routes solar energy to power your home directly during the day.
- It charges your battery with surplus solar.
- It draws from the battery at night or during load-shedding.
- It manages the grid connection, topping up when needed and switching to backup instantly when the grid fails.
That last point is why the inverter is so central to beating load-shedding. A good hybrid inverter switches to battery power fast enough that your lights and electronics don't even flicker.
What to look for in an inverter
Before comparing brands, understand the specifications that actually affect your experience:
Power rating (kW)
This sets how much your home can draw at once. A 3.6kW inverter suits smaller homes running essentials; a 5kW inverter handles more simultaneous load. Size it to your real peak demand — our sizing guide explains how.
Hybrid capability
For load-shedding you want a true hybrid inverter that manages solar, battery and grid seamlessly, with fast switchover to backup. All three brands here offer hybrid models.
Battery compatibility
The inverter needs to work with your chosen battery. Some ecosystems are tightly integrated (the inverter and battery are designed together), which can simplify installation and support.
Efficiency and surge handling
Higher efficiency means less energy lost in conversion. Surge capacity matters if you start motors — like a pump or fridge compressor — that briefly draw more than their running power.
Warranty and local support
Arguably the most important real-world factor. An inverter is a long-term investment, so a solid warranty and readily available local support and parts matter enormously. This is where buying through an established installer pays off.
The three brands compared
All three are genuine, reputable options that Alumo installs. Here's how they're generally positioned for South African homes.
Sunsynk
Sunsynk has become one of the most popular and trusted inverter brands in South Africa, and it's the backbone of most of Alumo's home packages. It's known for robust hybrid inverters, strong local presence and a wide, well-supported product range. Alumo's Bronze, Silver and Gold home packages are all built around Sunsynk inverters — the 3.6kW Powerlynk X in the smaller packages and the 5kW in the Gold. If you want a proven, widely-supported workhorse, Sunsynk is a safe and popular default.
Solis
Solis is a long-established global inverter manufacturer with a strong reputation for reliable, cost-effective hybrid inverters. It appears in Alumo's longer-term finance options — for example the BrightStart and 7-year Watt-a-Deal packages pair a Solis 5kW inverter with an Eenovance battery. Solis is a solid choice where value and dependable performance are the priorities.
AlphaESS
AlphaESS is known for integrated energy-storage systems — inverters and batteries designed to work together as one package. That tight integration can make for a clean, streamlined installation. Alumo's entry Hot Deal subscription is built around an AlphaESS G3 5kW inverter with a matched battery, from R1,299/month. If you like the idea of an all-in-one, purpose-matched system at a low monthly entry, AlphaESS is worth considering.
So which is "best"?
Honestly, there's no universal winner — and that's the point. All three are quality brands. The best inverter for you depends on your system size, your battery choice, your budget and the package that fits your needs. What matters far more than chasing a specific badge is that the inverter is correctly sized, properly installed, and backed by warranty and local support — all of which come with an established installer.
Why the installer matters as much as the brand
A great inverter installed poorly is a bad system. An appropriate inverter installed and supported well is a great system. The brand on the box is only part of the equation — commissioning, configuration, compliance and after-sales support determine how it actually performs and how quickly issues get resolved.
That's why buying through Alumo matters: you get tier-one hardware (Sunsynk, Solis, AlphaESS and others), professional NRS-approved installation, and warranties and support standing behind it. SolarGuide's role is simply to help you compare and arrange a free quote — Alumo supplies, installs and warrants the system.
Get a free Alumo quote → and Alumo will recommend and size the right inverter for your home.
Frequently asked questions
Is Sunsynk better than Solis or AlphaESS?
Not universally — all three are reputable, quality brands used across South Africa. Sunsynk is the most common in Alumo's home packages, Solis features in longer-term finance options, and AlphaESS offers integrated all-in-one systems. The best choice depends on your system and needs.
What's a hybrid inverter, and do I need one?
A hybrid inverter manages solar, battery and grid together and switches to battery backup instantly during load-shedding. For a South African home that wants both savings and backup power, yes — a hybrid inverter is what you want.
What size inverter do I need?
It depends on how much power your home draws at once. Smaller homes running essentials are well served by a 3.6kW inverter; homes running more simultaneously suit a 5kW or larger. A site assessment sizes it precisely.
Does the inverter come with a warranty?
Yes. Reputable inverters carry manufacturer warranties, and when installed through Alumo the system is backed by Alumo's warranties and local support — a key reason to buy through an established installer.
How do I know which inverter is right for me?
Get a free Alumo quote →. Alumo assesses your home and usage and recommends the appropriate inverter, size and matching battery — with no obligation.
SolarGuide is an independent referral partner. We help you compare options and arrange a free quote — Alumo supplies, installs, finances and warrants the systems. Pricing is indicative, sourced from Alumo’s published catalogue, and subject to a site assessment and credit approval.
