Why solar beats a generator for load-shedding
Generators have their place, but for day-to-day load-shedding a solar-and-battery system wins on almost every front:
- It's silent — no engine noise, no fumes.
- It's automatic — the battery takes over the instant the grid drops, so you often don't even notice the switch.
- It has no fuel cost — you're running on stored sunshine, not petrol or diesel that gets more expensive.
- It cuts your bill every day, not just during outages, because the panels offset your daytime grid usage.
A generator only costs you money. A solar system saves you money while also providing backup. That's the fundamental difference.
The three parts of a load-shedding-proof setup
1. Panels — your daytime engine
Solar panels generate power during daylight, running your home directly and recharging the battery. During the day, a well-sized array can keep you off the grid entirely and top up your storage for the evening.
2. The inverter — the brain
The inverter converts and directs power between your panels, battery, home and the grid. A hybrid inverter is what you want for load-shedding: it manages solar, battery and grid seamlessly, and switches to battery power fast enough that sensitive electronics stay on. Its kW rating sets how much you can run at once.
3. The battery — your backup tank
This is the component that carries you through an outage. Rated in kilowatt-hours (kWh), it's essentially the size of your energy tank. The bigger it is, the longer your essentials run when the grid is down. For most homes, battery capacity is the single most important decision for beating load-shedding.
Start with your essential loads
The secret to a cost-effective load-shedding setup is this: you don't need to power your entire home during an outage. You need to power what matters. Focus your battery on your essential loads:
- Lights throughout the house
- Wi-Fi router and fibre so you can keep working
- The fridge and freezer to protect your food
- TV and entertainment
- Phone and laptop charging
- Small kitchen appliances like a kettle or microwave (used briefly)
The big energy hogs — geyser, oven, tumble dryer, pool pump, aircon — can stay on the grid or run only when solar is producing. Trying to back all of them up during load-shedding drives the battery cost through the roof for little real benefit. A smart design keeps essentials on backup and shifts the heavy loads to daytime solar or grid.
How much backup do you actually need?
Load-shedding stages typically mean outages of around 2 to 4 hours at a time. So a battery that comfortably covers your essential loads for that window will get you through most schedules. If you want to cover back-to-back slots or longer outages, you add battery capacity.
Here's roughly how Alumo's home packages map to backup:
Bronze — essential backup
A 3.6kW Sunsynk inverter with a 3.8kWh battery and four panels gives around 3 hours of backup on essential loads. From R1,911/month on rent-to-own, or R47,314 outright. Ideal for smaller homes or anyone who mainly wants lights, Wi-Fi and the fridge to stay on.
Silver — the popular essentials package
A similar 3.6kW inverter and 3.8kWh battery tuned for reliable essential backup, from R2,035/month. A well-balanced starting point for a typical family home.
Gold — more power, longer runtime
A 5kW Sunsynk inverter with a larger 5.32kWh battery and six panels delivers around 5 hours of backup and enough inverter headroom to run more at once. From R2,423/month, or R51,357 outright. Best for larger homes or those who want to cover longer or overlapping outages.
Because storage is modular, you can start with what fits your budget and add battery capacity later as your needs grow. To understand exactly how kW and kWh translate into your runtime, see our system sizing guide.
Designing for the real world
Match the inverter to your peak demand
Think about what runs at the same time during an outage. If your essentials rarely exceed a few kilowatts, a 3.6kW–5kW inverter is plenty. Homes that want to run heavier appliances simultaneously need more inverter capacity.
Size the battery to your evening
Most load-shedding pain is in the evening — dinner, homework, screens on. Size your battery to comfortably cover that evening window on essential loads, with margin for a longer outage.
Let solar do the heavy lifting by day
Run your geyser, washing, and pool pump during daylight when the panels are producing. This shifts your biggest loads onto free solar energy and keeps the battery reserved for backup.
Who installs and stands behind it
SolarGuide is an independent referral partner. We help you work out your essential loads and the right amount of backup, then arrange a free quote. The system is designed, supplied, installed and warranted by Alumo, one of South Africa's leading installers, using tier-one brands like Sunsynk, Solis and AlphaESS. Pricing is indicative and subject to a site assessment.
Get a free Alumo quote → and we'll match a load-shedding-proof setup to your home.
Frequently asked questions
Will my system switch on automatically during load-shedding?
Yes. A hybrid inverter switches to battery power the moment the grid drops — usually fast enough that your lights, Wi-Fi and electronics stay on without interruption.
How many hours of backup will I get?
It depends on your battery size and how much you're running. Alumo's home packages deliver roughly 3 to 5+ hours on essential loads; adding battery capacity extends that. A quote will size it to your actual usage.
Can I run my geyser and oven during load-shedding?
You can, but these are heavy loads that drain a battery quickly and raise the cost of the system significantly. The smart approach is to keep essentials on backup and run big appliances on daytime solar or the grid.
Do I need solar panels, or just a battery?
You can install a battery-only backup, but adding panels is what makes the system pay for itself — the panels cut your daily bill and recharge the battery for free. Solar-plus-battery is the setup that both beats load-shedding and saves money.
How do I get the right size for my home?
Get a free Alumo quote →. A short assessment of your essential loads and usage lets Alumo size the inverter and battery correctly — 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.
