Load shedding has made solar power in Zimbabwe mainstream, from small panel-and-battery kits to whole-house inverter systems. Most money wasted on solar is wasted at the design stage, by buying components that do not match the load or each other.
Start with your load, not the panels
List what you actually need to keep running and for how long. Lights, phone charging, a television, a router and a fridge are a very different system from one running a borehole pump, a geyser or a welding machine.
For each appliance, note its power rating in watts and roughly how many hours a day you use it. Multiply and add: that daily figure in watt-hours is the number every installer needs and the number that determines the size of everything else. Heating appliances — geyser, kettle, iron, heater, stove — are enormous loads and are usually left on the grid or on gas rather than on solar.
What the components do
- Panels generate energy while the sun is on them. Their rating is peak output in ideal conditions, not what you will get all day.
- The charge controller (MPPT is the more efficient type) manages charging from the panels into the battery.
- The battery stores energy for use at night or during a cut. This is usually the most expensive and the most misunderstood part.
- The inverter converts stored direct current into the alternating current your appliances use. Its rating limits how much you can run at once.
Two separate limits catch people out: the inverter limits instantaneous load, and the battery limits how long you can run. A big inverter with a small battery dies quickly; a big battery with a small inverter trips when the fridge and microwave start together.
Batteries
Lead-acid batteries are cheaper up front, heavier, need ventilation and tolerate less deep discharge. Lithium batteries cost more, last longer, tolerate deeper discharge and are lighter. Compare on usable capacity and expected cycles rather than on headline capacity alone, and remember that discharging a battery deeply and often shortens its life dramatically.
Never mix old and new batteries in a bank, or different types and capacities. The weakest cell governs the whole bank.
What a good installation looks like
- A qualified installer and, for anything wired into the house, work that complies with the electrical regulations. Bad DC wiring starts fires.
- Correctly rated cable and proper fusing and isolation on both DC and AC sides.
- Panels mounted securely, oriented to get sun through the day and clear of shade — even partial shading on one panel drags down a string.
- Earthing and surge protection, which matter in a country with intense lightning seasons.
- Batteries in a ventilated, dry space at a sensible temperature.
- A written specification and warranty, with model numbers, and a handover explaining how to read the display.
Common mistakes
- Buying a "5kW system" without knowing what it means — panels, inverter and battery each have their own rating.
- Putting heating loads on solar.
- Undersizing the battery so the system dies by 9pm.
- Shading from a tree or a wall that was not there when the quote was drawn.
- Cheap uncertified components that fail in months.
- No maintenance: dusty panels lose output, and dust is not optional in the dry season.
Living with it
Solar rewards behaviour change. Run heavy loads while the sun is up, charge devices during the day, switch to LED lighting, and check the display so you learn what your system actually delivers in different weather. In the rainy season expect several cloudy days in a row — that is what the battery is for, and why oversizing the battery slightly is rarely regretted.
Small kits are still worth it
If a full system is out of reach, a small panel with a battery for lights and phone charging changes daily life for a fraction of the cost, and it is what most rural households start with. Buy from a supplier who will honour a warranty rather than the cheapest kit on offer.
Frequently asked questions
What size solar system do I need?
It depends on your daily energy use in watt-hours and the largest load you want to run at once. List your appliances and hours of use before asking for a quote.
Can solar run a geyser?
It can, but it is an expensive way to heat water. A solar geyser or gas is usually a better answer than running an electric element from batteries.
Lithium or lead-acid batteries?
Lithium costs more up front and generally lasts longer with deeper usable capacity. Lead-acid is cheaper initially. Compare usable capacity and cycle life, not headline capacity.
Do I need council or regulatory approval?
Electrical work must comply with the regulations, and grid-tied systems have their own requirements. Use a qualified installer and ask them what applies to your setup.
How long do panels last?
Panels typically carry long performance warranties and outlast batteries by many years. Batteries are the component you should expect to replace first.
Related: ZESA prepaid electricity. More guides on the guides page.