Solar System Calculator Kenya
Answer a few quick questions about your home, business or institution and get an instant estimate of the solar panels, inverter and battery storage you may need, plus your likely monthly solar generation. It's built around how Kenyan electricity bills actually work, so you can start with either your Kenya Power bill or your consumption in kWh — whichever you have on hand.
Step 1 of 6 — Property
How Does the Solar Calculator Work?
The calculator walks through five short questions — what you're powering, how much electricity you use, where the property is, how much backup you want, and what you're trying to achieve. It turns your monthly electricity bill or consumption into a daily energy requirement, then works out a starting-point solar system size using standard assumptions for Kenya's sunshine hours, typical system losses, and battery performance. The result is a quick, practical starting figure for solar panels, inverter size and battery storage — not a substitute for a proper site survey, but a solid basis for a conversation with our technical team.
What Size Solar System Do I Need in Kenya?
The right solar system size depends mostly on three things: how much energy you use each month, how many hours of backup you want when the grid is down, and what you're trying to achieve — whether that's simply trimming your Kenya Power bill, running mostly on solar, or going fully off-grid. A small Nairobi household with a modest bill might need a system under 3 kWp, while a hotel, school, hospital or factory with heavier daytime and evening loads could need anywhere from 10 kWp to well over 100 kWp. Because irradiation, roof space, and load patterns vary across the country, treat any calculator output as a sizing estimate to refine with a site visit rather than a final number.
How Many Solar Panels Do I Need?
Once you know the solar capacity you need in kilowatts-peak (kWp), the number of panels follows from the wattage of the panel you choose. As an example, a 5.5 kWp system built from 550W panels needs 10 panels, while the same capacity built from 450W panels needs about 13. Panel count is always rounded up to a whole number, and available roof area, orientation and shading can all affect how many panels actually fit — another reason a site assessment matters before you order equipment.
How Much Battery Storage Do I Need?
Battery storage is sized around how long you want backup power to last and how much of your load you want it to carry, not around your solar panels directly. Longer backup durations, heavier loads, and deeper discharge all push the required battery capacity up. If your calculator result flags a particularly large battery bank, it usually means the combination of backup hours and daily consumption you selected is significant — worth discussing with our team, since there are often ways to right-size backup around your most essential loads instead of the whole property.
How Much Does a Solar System Cost in Kenya?
Solar system costs in Kenya vary widely with system size, equipment quality, battery chemistry, and installation complexity. A small grid-tied or hybrid system for a home can start in the low hundreds of thousands of shillings, while hybrid systems with meaningful battery backup, and larger commercial, hotel, school or factory installations, typically run into the millions. Because pricing depends on the exact equipment and site conditions, this calculator does not attempt to estimate cost — it focuses on system sizing, and our team can follow up with an accurate, itemised quotation once we understand your site.
Why You Should Get a Professional Solar Assessment
A calculator can only work from the numbers you give it. A professional assessment adds what a form can't: your actual roof or ground space and orientation, the real behaviour of your appliances and machinery, the condition of your existing electrical installation, shading from trees or nearby buildings, and (for boreholes or water pumping) the hydraulic details of your pump. Waterlift Solar's technical team combines solar PV design with borehole and water infrastructure experience, so a site visit also catches interactions a generic calculator never will — like sizing a system that has to run a submersible pump as well as a household.
Frequently Asked Questions
Most Kenyan homes need somewhere between 4 and 12 panels, depending on your monthly consumption, the panel wattage used, and how much of your usage you want solar to cover. Run your numbers through the calculator above for a starting estimate, then confirm with a site assessment.
Cost depends heavily on system size, battery capacity, and equipment quality, so it's not something a generic calculator can responsibly estimate. Request a detailed quotation above and our team will price your specific system.
Yes — a correctly sized off-grid or hybrid system with enough battery storage can run a home entirely on solar. It generally needs a larger panel array and battery bank than a grid-tied system, so select "Go completely off-grid" as your goal above to see what that implies for your usage.
It depends on how many backup hours you want and how much load has to run during that time. The calculator above converts your chosen backup duration into an estimated battery capacity in kWh; how many physical battery units that becomes depends on the specific battery model our team recommends for your site.
Yes — solar water pumping is a common setup in Kenya, especially for farms, conservancies and rural institutions. Choose "Solar water pumping" as your goal above; because pump sizing also depends on borehole depth, flow rate and pipe run, our team will confirm the final design against your pump's actual specifications.
Yes. Even a modest grid-tied or hybrid solar system offsets a meaningful share of your daytime usage, which lowers the units you buy from Kenya Power each month. Select "Reduce my electricity bill" as your goal above to see a system sized specifically for that.
It's a good starting-point estimate built on standard engineering assumptions for Kenya, not a certified design. It doesn't yet account for your specific roof orientation, shading, appliance-level load profile, or county-by-county sunshine variation. Treat the numbers as a sizing guide, then request a detailed quotation so our team can confirm the final design with a proper site assessment.