Kenya's grid has improved dramatically over the past decade, but scheduled maintenance, weather events, and load shedding still mean your security system can lose power at the worst possible moments. A well-designed solar backup is the quiet, reliable answer.
The first question to answer is: what actually needs backup power? For a typical home, the critical security loads are CCTV cameras and NVR, gate motors, electric fence energiser, alarm panel, and a few key LED lights. Adding it up, these usually total 150-400 watts of continuous load.
For 24-hour autonomy on 300 watts, you need approximately 2 kWh of battery storage and 400-600 watts of solar panels (accounting for Kenya's average 5.5 peak sun hours and typical losses). A lithium-ion battery costs around KES 85,000, panels run KES 25,000-40,000, and you'll need a hybrid inverter at KES 35,000-55,000.
Lead-acid batteries are cheaper upfront (KES 30,000 for equivalent capacity) but last only 3-5 years vs 10+ years for lithium. Over the system's lifetime, lithium is almost always cheaper per kWh.
Installation tips we've learned:
Panel orientation in Nairobi should be true north at 5-10° tilt for year-round performance. In Mombasa and coastal areas, keep the tilt flatter (2-5°) due to the lower latitude.
Run CCTV cameras on 12V DC directly from the battery bank where possible — skipping the inverter eliminates conversion losses and adds 2-3 hours of autonomy.
Always oversize the solar array by 20-30%. This compensates for panel degradation (typically 0.5% per year) and gives you headroom on cloudy days.
Include a transfer switch so the system seamlessly falls back to grid when solar is low. Don't run sensitive electronics like NVRs and gate controllers from a raw inverter — use a UPS or pure sine wave inverter to avoid premature failures.
For most homes, total installed cost for a security-focused solar backup is KES 180,000-280,000. It pays for itself in avoided generator fuel, reduced wear on the security system, and — most importantly — the peace of mind that comes with knowing a blackout can't blind your cameras.
