Find the Right Solar System Size for Your Home in Seconds
Use our simple solar system size calculator. Choose your home type, get an instant recommendation and a free WhatsApp quote in 5 minutes.
Solar System Size Calculator
This calculator gives you a quick, realistic estimate of the solar system size you’re likely to need and whether it makes financial sense for your home or business.
How to use it:
Enter your daily electricity usage in units (1 unit = 1 kWh).
You can find this on your ZESA prepaid meter or purchase history.Click “Calculate My Solar System.”
Instantly see:
The recommended system size
Estimated cost
What you’re currently spending on ZESA
How much you could save with solar
How long it takes for the system to pay for itself
This tool is designed to give you an estimate. It helps you decide whether solar is worth it before committing to a site visit.
Solar System Sizing + ROI Calculator
Calculate your ideal solar system size and return on investment
What Your Results Mean
Estimated System Price
This is the typical installed cost of a solar system that can comfortably support your daily electricity usage. It includes the inverter, batteries, and solar panels — based on common setups used in Zimbabwe.
Final pricing may change slightly after a load audit.
Monthly ZESA Cost
This shows what you’re estimated to be paying per month for electricity from ZESA, calculated using:
Your daily usage
ZESA’s progressive tariff bands (higher usage = higher cost per unit)
Annual ZESA Cost
Your monthly ZESA cost multiplied by 12, giving you a clearer picture of what electricity is costing you over a full year.
Estimated Annual Savings (80% offset)
This estimates how much money you could save per year by switching to solar.
Why 80%? Most well-sized solar systems are designed to:
- Cover most daily usage
- Reduce grid reliance significantly
- Still allow occasional ZESA use when needed (bad weather, high loads)
This keeps the estimate conservative and realistic, not exaggerated.
Payback Period
How long it would take for your solar system to pay for itself through electricity savings.
For example:
A 4.5-year payback means that after 4.5 years, the savings you’ve made equal what you paid for the system. After that point, the system is effectively saving you money every year.
Important Note About These Estimates
This calculator assumes:
- Typical household appliances
- Reasonable usage habits
- Proper system installation
Every home is different. Two households with the same daily units can need very different systems depending on:
- Appliance types (fridges, boreholes, geysers, pumps)
- When electricity is used (day vs night)
- Future plans (adding appliances later)
That’s why final system sizing is always confirmed with a load audit.
Book a Free Load Audit
A load audit confirms the exact system size you need, prevents overpaying or undersizing and identifies hidden power-hungry appliances.
Frequently Asked Questions
How Do I Know What Size Solar System I Need?
Daily electricity use is your best starting point. However, usage alone doesn’t tell the full story. Appliance types, peak usage times, and future expansion all affect system size. The calculator gives a realistic range, while a load audit confirms the exact configuration needed to avoid overpaying or underperforming.
Is Solar Cheaper Than Zesa in the Long Run?
For most households, yes. Higher tariffs from increased consumption adds up quickly. A properly sized solar system reduces electricity bills significantly and stabilizes energy costs for years. Once the system pays for itself, the savings continue — which is why you should look at solar as a long-term hedge rather than a short-term expense.
Why Are Solar Systems Expensive Upfront?
Solar systems combine multiple major components — panels, inverter, batteries, mounting, wiring, and professional installation — all paid for upfront. Unlike electricity bills spread over years, solar compresses those future costs into one investment. The upside is long-term savings, energy independence, and protection against tariff increases, but only if the system is sized correctly from the start.
Ready for Reliable Power?
Zimbabwe’s power shortages make solar an essential investment, not a luxury. A properly sized system keeps fridges cold, pumps running, and prepaid ZESA costs down.
Whether you’re upgrading from backup to full off-grid or starting small, our team sizes, installs, and supports every system from end to end.
Zero guesswork. Get a system sized properly for your home and your budget.