3kW Solar System in the Philippines

What a 3kW system delivers in PH conditions

Using 4-4.5 peak sun hours and 75% efficiency, a 3kW (3,000W) array generates roughly 11-13 kWh per day — about 350-400 kWh per month. That covers the entire electricity consumption of a typical 4-person Metro Manila household with one inverter aircon used at night, or all daytime use for a household running aircon for 6-8 hours.

At April 2026 Meralco rates (P14.35/kWh), 350-400 kWh of avoided consumption is P5,000-P5,700 in monthly savings, putting payback in the 3-4 year range for a hybrid DIY build. See the Meralco rate hike breakdown for the math.

Bill of materials for a 3kW hybrid system

A typical 3kW hybrid build uses the following components. Exact prices vary — see the 2026 PH price guide for current ranges.

• Panels: 6 x 500W or 5 x 600W tier-1 PERC modules (3.0 kWp). See our 600W panel breakdown.
• Hybrid inverter: 5kW unit (Deye, Growatt, or Voltronic) — the 5kW size gives headroom for surge loads and future expansion.
• Battery: 48V 100Ah LiFePO4 (5.12 kWh) is the entry-level rack-mount option for a 3kW hybrid. Step up to 200Ah if you need full overnight aircon.
• Charge controller: Built into the hybrid inverter. No separate MPPT needed.
• Wiring & protection: 10 AWG PV wire on the panel side, 4 AWG battery cable, DC isolators, and a 32A AC breaker. Cross-check with the wire sizing chart.
• Mounting: Aluminum L-feet and rails sized for 6 panels.

Off-grid vs hybrid vs grid-tie at 3kW

The same 3kW of panels can be configured three different ways. Pick based on whether brownouts matter to you and whether you want to export to Meralco:

• Pure off-grid: 3kW panels, hybrid inverter, larger battery (10 kWh+), no Meralco connection. Highest hardware cost, full grid independence.
• Hybrid (recommended for PH): 3kW panels, 5kW hybrid inverter, 5-10 kWh battery, still connected to Meralco. Brownout-proof and can export for net-metering credits.
• Grid-tie only: 3kW panels, grid-tie inverter, no battery. Cheapest upfront, best payback, but cuts out during brownouts.

Full architecture comparison and net-metering rules are in the Meralco solar guide.

Is 3kW enough for your house?

The honest answer: it depends on your appliances and how much aircon usage you want to cover. Two ways to confirm:

1. Upload a photo of your Meralco bill to the kWh calculator and it computes whether 3kW is right-sized, undersized, or overkill for your monthly kWh.
2. Use the appliance-based DIY Builder — pick what you want to power and it sizes the system from scratch.

For step-by-step sizing math by hand, see the off-grid sizing guide.