DIY Build Guide
Build Your First Solar Power System
A beginner-friendly step-by-step guide. No experience needed. Follow this sequence exactly and your system will work the first time.
What You Need
A Basic Starter System
Solar Panel
100W starter kit recommended
Charge Controller
Included in most starter kits
Battery
100Ah sealed lead-acid or LiFePO⁴
Inverter
1,000W pure sine wave minimum
Wiring + Connectors
MC4 connectors, correctly sized cable
Tools
Flathead screwdriver, wrench, drill
⚠️ Critical Rule Before You Start
Always connect the charge controller to the battery BEFORE connecting the solar panels. Connecting panels first without a battery can burn out the charge controller instantly.
The Build Sequence
Step-by-Step Wiring Guide
Mount the Solar Panel
Attach mounting brackets to the panel using the included hardware (bolt → washer → locking nut configuration). Secure to your roof, vehicle, or frame using a drill and included screws. Ensure no part of the panel is shaded — even partial shade kills output on the entire panel.
Mount the Charge Controller Near the Battery
Mount the charge controller on a board or wall close to the battery. Short cable runs between the controller and battery reduce energy loss. Keep cables neat and organised.
⚡ Connect Controller to Battery FIRST
Strip the cable insulation. Find the battery icon on the charge controller. Connect negative (−) first, then positive (+). Hold the wire firmly and push up while tightening the terminal screw — they slip easily. Pull the wire to confirm it is secure.
✓ You should see a green light on the charge controller. This confirms a good battery connection.
Configure Battery Type on the Controller
Most charge controllers need to know your battery type. Hold the mode button for 7 seconds until it flashes, then cycle through:
Select the correct colour and wait 10 seconds for settings to save.
Connect Solar Panel to Charge Controller
Now connect the solar panel wires one at a time. Find the solar panel icon on the controller. Connect negative MC4 wire first, then positive. The negative MC4 connector has no marker; the positive has a red ring. Screw terminals down fully while holding the wire up — they slip. After connecting both, take the panel to a sunny spot.
Verify the System is Charging
Back at the charge controller, you should now see two green lights — one solid for battery, one flashing for the solar panel (PV). A flashing PV light means the panel is actively charging the battery. Even a cloudy day should provide enough light to trigger this.
✓ Two green lights + one flashing = your system is working.
Add the Inverter
Connect the inverter directly to the battery terminals — positive to positive, negative to negative. Use the correct wire gauge for the inverter’s rated current. Add a correctly sized fuse within 12–18 inches of the battery terminal. The inverter converts battery DC power into AC power for your normal appliances. Switch on the inverter only when you are ready to use it — it draws power even on standby.
Common Wiring Mistakes
What Goes Wrong and Why
Panels connected before battery
Charge controller burns out immediately. Always battery first, panels second.
Loose terminal connections
Causes arcing, energy loss, and fire risk. Always tug-test every connection.
Wrong battery type setting
The controller charges at wrong voltage. Damages or undercharges the battery over time.
Panel in partial shade
Even one shaded cell reduces output for the entire panel. Position for full, unobstructed sun.
No fuse on battery cables
A short circuit can deliver thousands of amps. A fuse near the battery terminal is non-negotiable.
Undersized inverter cable
The inverter draws high current at full load. Thin cables overheat and start fires.
Learn the Maths Behind the Build
Get Your System Sized Correctly First
A correct build starts with correct sizing. Learn the step-by-step method Maina uses in the field — or join the free session and have him size it live for your location.