5kVA Solar Installation in Sagana — Was It Worth KSh 420,000?
Sagana sits along the Nairobi-Nyeri highway, about 100km from Nairobi. Beautiful town. Growing fast. But the power situation? Frequent outages, voltage fluctuations from the ageing grid, and electricity bills that keep climbing — especially for homes along the Sagana-Kagio corridor.
Our client had had enough. Here’s exactly what we installed, what it cost, what it powers, and whether the investment is paying off.
Project Snapshot
Sagana, Kirinyaga County
5kVA (5,000W continuous)
3-Bedroom Residential Home
KSh 420,000 (fully installed)
1 day
KSh 6,500-8,000
📹 Watch the Full Installation:
The Problem: Outages, Spoilt Food & a KSh 8,000 Bill
Our client — a family of five living in a 3-bedroom home near Sagana town — came to us with three complaints that are common across Kirinyaga County:
What We Installed: Full Component Breakdown
| Component | Specification | Qty |
|---|---|---|
| ☀️ Solar Panels | 555W Tier-1 Monocrystalline — 25-year performance warranty | 8 |
| ⚡ Inverter | 5kVA 48V Hybrid Inverter — WiFi monitoring, pure sine wave, MPPT charge controller built-in | 1 |
| 🔋 Battery | 5.12kWh LiFePO4 Lithium (48V 100Ah) — 6,000+ cycles, built-in BMS, 10-year warranty | 1 |
| 🔧 Mounting | Aluminium roof rails + stainless steel clamps (mabati roof) | 1 set |
| 🛡️ Protection | DC isolator, AC breakers, surge protection, earthing kit | 1 set |
| 📡 Monitoring | WiFi dongle — real-time generation, battery SOC, load monitoring via phone app | 1 |
Total array: 8 × 555W = 4,440W peak. At 5-6 peak sun hours in Kirinyaga County, this generates 22-27 kWh per day — far more than the household’s ~7 kWh daily consumption.
Installation Day: Start to Power-On in Under 8 Hours
Team arrived from Nairobi. Confirmed mabati roof condition, measured panel layout, identified optimal string configuration (2 strings of 4 panels).
Aluminium rails clamped to mabati ridges. 8 panels mounted, angled for optimal sun exposure. MC4 connectors joined in series-parallel configuration.
Inverter wall-mounted in the store room. Battery placed on a ventilated shelf. DC and AC wiring connected. Protection devices installed (DC isolator, AC breakers, surge protector, earthing).
Connected the inverter output to the house’s existing distribution board via a changeover system. All circuits now powered by solar with automatic grid backup.
Full system test under load. Verified solar charging, battery backup switchover, and grid fallback. WiFi monitoring configured. Client walked through the phone app. System live — generating power.
What the System Powers — Everything in the House
| Appliance | Watts | Daily kWh |
|---|---|---|
| LED lights (×10) | 100 | 0.6 |
| TV (43″) + decoder | 75 | 0.4 |
| Double-door fridge (24/7) | 180 | 1.5 |
| WiFi router (24/7) | 12 | 0.3 |
| Phone chargers (×4) + laptop | — | 0.4 |
| Iron (3×/week) | 1,200 | 0.5 |
| Electric kettle (3×/day) | 1,500 | 0.7 |
| Microwave (10-15 min/day) | 1,200 | 0.3 |
| Washing machine (2×/week) | 500 | 0.3 |
| Security light + CCTV | 80 | 1.2 |
| Daily total | — | ~6.2 kWh |
The Results: Before vs After
| Before Solar | After Solar |
|---|---|
| Monthly bill: KSh 6,500-8,000 | Monthly bill: KSh 0-200 (grid used only as backup) |
| Power outages: 3-4× per week | Power outages felt: Zero (battery takes over instantly) |
| Spoilt food: Regular (fridge off for hours) | Spoilt food: None (fridge runs 24/7 on solar + battery) |
| Appliance damage: 2 devices lost to voltage spikes | Pure sine wave inverter protects all appliances |
| Annual electricity cost: KSh 78,000-96,000 | Annual electricity cost: KSh 0-2,400 |
Return on Investment
After the system pays for itself in ~5 years, the family saves KSh 84,000+ per year for the remaining 20+ years of the system’s lifespan. That’s over KSh 1.7 million in lifetime savings — from a single KSh 420,000 investment. And electricity tariffs will keep rising, making the real savings even higher.
Why Kirinyaga County Is Perfect for Solar
Sagana and the wider Kirinyaga County sit at 1,158-1,500m elevation on the southern slopes of Mt. Kenya. This gives the area a unique advantage for solar:
Live in Sagana, Kerugoya, Kagio, or Kirinyaga County?
We deliver and install across all 47 counties. Same system, same price, same warranty.
📖 Related Guides:
→ Solar System for 3 Bedroom House in Kenya
→ Solar System for 4 Bedroom House in Kenya
* Results based on actual installation data. Individual results may vary based on household consumption, weather patterns, and system configuration.
