A full off-grid solar setup on Siargao runs about ₱1,100,000. A hybrid system with Siarelco backup is roughly half that at ₱550,000. These aren't estimates. They're actual vendor quotes from March 2026.
If you're building a rental villa, getting the power setup right matters more than most people think. One brownout during a guest's stay and you're looking at a bad review.
What a Local Vendor Quoted Us
Here's what we got from a Siargao-based solar installer in March 2026, installation included:
| System | Price (PHP) | Specs | Best For |
|---|---|---|---|
| Hybrid / backup | ₱550,000 | 10x600W panels, 1 battery, 1 inverter | 1-2 BR villa, Siarelco as primary |
| Full off-grid | ₱1,100,000 | 20x600W panels, 2x17.5kWh batteries, 2x5kW inverters | 2-3 BR villa, no grid dependency |
| Solar water heater | ₱80,000 | 300L pressurized tank, installed | Any build (add-on) |
The off-grid system was sized to handle two air conditioning units (one bedroom, one living area), a water heater, pool pump, and fridge. That's a realistic load for a 2-bedroom rental villa.
How We Price It in the Calculator
Our cost calculator uses these rates, calibrated against the vendor quotes above:
| Calculator Option | Price |
|---|---|
| 6 kW system | ₱550,000 |
| 10 kW system | ₱900,000 |
| 15 kW system | ₱1,350,000 |
| 25 kW+ system | ₱2,100,000 |
The 6kW option maps closely to the hybrid quote (10 panels = ~6kW capacity). The 10kW and above are scaled estimates. If you're going bigger, expect to negotiate directly with vendors.
Roof Requirements You Should Know
Before you commit to a solar size, check your roof:
- Each panel needs about 3 sqm of roof space. A 12kW system (20 panels) takes ~60 sqm of unshaded roof. That's a lot.
- Panels should face south at roughly a 10-degree angle. Siargao is close to the equator, so a near-flat angle works well.
- White roofing helps. It reflects heat, keeping panels cooler and more efficient. Some builders paint the roof white specifically for this.
Hybrid vs. Off-Grid: Our Take
| Hybrid (₱550k) | Off-Grid (₱1.1M) | |
|---|---|---|
| Upfront cost | ₱550,000 | ₱1,100,000 |
| Grid dependency | Yes (Siarelco) | None |
| Brownout protection | Yes | Yes |
| Best for General Luna | Yes | No |
| Best for remote areas | No | Yes |
| Handles high AC load | Limited | Yes |
| Monthly electric bill | ₱2-5k | ₱0 |
For most rental villas in General Luna or Cloud 9, we'd go hybrid. Siarelco handles your baseline load, and the battery kicks in during outages. Your guests don't notice the switch, and you save ₱550k+ compared to full off-grid.
Full off-grid makes more sense if you're building in Pacifico or Dapa where grid connections are expensive or unreliable, or if you're running a property with high loads (multiple AC units, pool heating) and want complete energy independence.
Grid Connection Costs
Even with solar, you'll probably want a Siarelco connection as backup (unless you're going fully off-grid). Here's what that costs:
| Item | Cost |
|---|---|
| Siarelco base connection | ₱25,000 |
| Siarelco (remote areas) | up to ₱50,000 |
| Transformer (if needed) | ₱150,000 |
Remote locations like Pacifico and Dapa tend to be on the higher end for connection fees. In some cases, you'll also need a dedicated transformer, and that's ₱150,000 extra.
What This Means for Your Total Build
Solar is often the single biggest infrastructure line item. For a 2-bedroom villa in General Luna with a hybrid system, you're looking at ₱550,000 for solar plus ₱25,000-50,000 for the grid connection. That's around ₱600k just for power.
Compare that with the other infrastructure costs: deep well and water typically runs ₱225k, septic ₱45-80k. Power is easily 50%+ of your total infrastructure budget.
Want to see exactly how solar fits into your project? Run the numbers in our cost calculator. It factors in the system size, grid connection, and whether your location needs a transformer.
