Load shedding made backup power a necessity — but generator, inverter or solar? The honest engineering answer is 'it depends on your load profile'. Here's how to decide like an engineer.
Start with the load, not the technology
Every backup power mistake starts the same way: buying the machine before measuring the load. List what must run during an outage, add the wattages, and separate two numbers — the running load (everything on, steady state) and the peak load (the moment a fridge compressor or borehole pump starts, briefly drawing about three times its rating). Those two numbers, not the salesman, choose your system.
Our free generator calculator does this arithmetic in minutes: add your appliances and it handles starting surges and safe loading automatically.
Where each option wins
Generators win on heavy, occasional loads: welders, big pumps, whole-premises backup and long outages. Fuel is the running cost, noise and servicing are the price of admission, and correct sizing matters — a generator loafing under 30% load or screaming at 100% both die young.
Inverter-and-battery systems win on silent, instant, short-to-medium backup for lights, computers, TV, Wi-Fi and fridges. No fuel, no noise, no starting delay — but heating loads (geysers, stoves, kettles) drain batteries brutally and are usually left off inverter circuits.
Solar changes the economics of both: panels recharge batteries daily, converting the inverter from an outage bridge into a genuine electricity source that cuts your ZESA bill every month. For most homes and small businesses, the mature answer in 2026 is hybrid — solar + batteries for daily life, with a generator only if heavy machinery or multi-day resilience demands it.
The mistakes that cost the most
Undersized cable between inverter and batteries (fire risk and mystery shutdowns), batteries rated for a marketing brochure rather than your actual usable depth-of-discharge, geysers quietly wired onto the backup circuit, and 'bargain' panels with no warranty chain. Every one of these is cheaper to prevent at design time than to repair after.
Get the loads measured, run the numbers, and have the design confirmed by an engineer who will still answer the phone next year. Then buy once.
Frequently asked questions
What size solar system does a typical Zimbabwean home need?
A household running lights, fridge, TV, Wi-Fi and occasional appliances typically lands around 3–5 kW of inverter with 5–10 kWh of lithium storage — but measure your own load with our solar calculator rather than borrowing a neighbour's design.
Can I add solar to my existing generator setup?
Yes — hybrid inverters integrate solar, batteries, grid and generator, using the generator only as a last-resort charger. It is the most common upgrade path we install.