Not sure what size solar system you actually need?
Answer a few quick questions and get a starting system size for your property, free, in minutes.
Guessing at a system size means paying for capacity you don’t need, or running short when it matters. We believe every South African deserves a system sized on real numbers, not a guess.
Know your number before you talk to anyone.
With a free sizing estimate built from your own usage, you get a real starting kWp, which means your first conversation starts from facts, not a guess.
Avoid paying for size you don’t need.
With inputs matched to your usage and coverage goal, the tool flags over- or under-sizing early, which means your budget goes to power you’ll use.
Your next 3 steps
Step 1: Tell us your usage, consumption, spend and coverage goal, two minutes. Step 2: Get your starting size, estimated kW, battery and inverter. Step 3: Bring it to a real assessment, start a property-based design with our team.
Design your solar system around your actual usage, not a guess.
We size your system from your real consumption pattern, so what you install matches what you use.
Installations are quoted one at a time because no two houses are the same. Roof size, pitch and type all differ. So does the position of the DB board. So does what you actually run: a pool pump, machinery, appliances, electronics.
Twelve months of consumption history is what makes a design accurate. It shows your peak months and how they line up with the sunshine available at the time, so the system can be built to carry you through your worst month rather than an average one.
What a full design factors in
Your power objectives. The layout of your roof, its pitch, the direction it faces and the roof type. The position of your DB board. The appliances, electronics and equipment you need to power. The estimate above is a starting point built from your usage. The on site assessment that turns it into a real design is free.
We have designed systems like this before, including a family home with a 16 kW inverter, a 12 kWh battery and 27 x 600 W panels (16.2 kWp). And we can do the same for you.
Questions, answered clearly
What should the
next conversation cover?
Bring current electricity information and any property or system inputs the tool asks for.
No. It is an orientation point that must be tested against the actual property and operating brief.
Use the result to prepare a more focused design or finance conversation.
There's no fixed number, divide your average daily electricity use by your area's peak sun hours, then add extra capacity for system losses and cloudy days. ZenSolar's System Sizer gives you a starting estimate from those inputs, but your roof space, orientation and actual appliance load still decide the final design.
It depends on how much of your daily usage you want to cover from your battery and how many days of autonomy you want to plan for. Smaller households with modest daily use need less storage than larger households running heavier loads like geysers, air-con or a pool pump, the System Sizer's coverage-percentage input is designed to capture that difference.
Depth of discharge is how much of a battery's rated capacity you can safely use before recharging it. Lithium batteries, the type ZenSolar installs, support a much higher depth of discharge than older lead-acid batteries, so a lower DoD preference means you need a physically bigger battery to get the same usable energy, which is why the tool asks for it.
Higher system voltages (48V is now standard for most home hybrid systems) carry the same power at lower current, which means thinner cables, less energy loss, and better compatibility with modern hybrid inverters. Most new residential systems in South Africa are specified at 48V unless there's a specific reason to use a legacy 12V/24V setup.
Panels only generate during daylight, so a household using most of its power at night needs proportionally more battery storage to shift that solar energy into the evening. A daytime-heavy household can rely more on panels directly and needs less battery.
The tool's cost line is an editable assumption you can adjust, not a published ZenSolar price, enter your own quote or estimate to see how it changes the result. For an actual fixed price, request a quote after ZenSolar's free assessment of your property and usage.