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Demand Impact Analysis — How Solar Cuts Your Peak Electricity Load by 30%
Most people measure solar savings by looking at their monthly bill. But there's another dimension worth understanding: peak demand reduction. For commercial users especially, this is where significant hidden savings live.
What Is Peak Demand?
Peak demand is the maximum kilowatts (kW) your property draws from the grid at any point in a billing period. For residential Meralco users, it affects your bill indirectly. For commercial users on demand-charge tariffs, it's a direct line item on your bill.
Reducing peak demand means your electrical infrastructure works less hard — smaller transformers, less cable heating, better power quality throughout your home or building.
Real Numbers from a 5.5 kWp Hybrid System
Metric | Before Solar | After Solar | Reduction |
|---|---|---|---|
Average Peak Demand | 6.1 kW | 4.3 kW | 1.8 kW (30%) |
Monthly Peak Demand — Before vs After Solar
Month | Before Solar | After Solar | Reduction | % |
|---|---|---|---|---|
January | 5.8 kW | 4.1 kW | 1.7 kW | 29% |
February | 5.8 kW | 4.1 kW | 1.7 kW | 29% |
March | 5.9 kW | 4.0 kW | 1.9 kW | 32% |
April | 5.9 kW | 4.0 kW | 1.9 kW | 32% |
May | 6.0 kW | 4.0 kW | 2.0 kW | 33% |
June | 6.0 kW | 4.2 kW | 1.8 kW | 30% |
July | 6.1 kW | 4.4 kW | 1.7 kW | 28% |
August | 6.1 kW | 4.4 kW | 1.7 kW | 28% |
September | 6.2 kW | 4.4 kW | 1.8 kW | 29% |
October | 6.2 kW | 4.4 kW | 1.8 kW | 29% |
November | 6.3 kW | 4.5 kW | 1.8 kW | 29% |
December | 6.3 kW | 4.6 kW | 1.7 kW | 27% |
* Hybrid system — battery storage provides demand reduction during both daytime and evening peak hours.
Why Hybrid Beats Grid-Tied for Demand Reduction
A grid-tied system only reduces demand when the sun is shining. The moment clouds roll in or the sun sets, your demand goes right back up.
A hybrid system with battery storage smooths demand across the day and the evening peak. The battery dispatches stored solar energy during the 6-9pm peak period — when Meralco's grid is most congested and rates are highest under time-of-use billing.
Why This Matters for Commercial Users
Meralco commercial and industrial accounts pay a demand charge — a fee per kW of peak demand recorded during the billing period. A business with 50 kW peak demand might pay ₱400-500 per kW/month in demand charges alone — that's ₱20,000-25,000/month before the energy charge.
A well-designed commercial solar + battery system targeting peak shaving can reduce this by 20-35% — sometimes saving more from demand reduction alone than from energy generation.
See your own demand impact analysis using our free Solar Quotation Tool — it shows your monthly before/after demand profile automatically.
Engr. Jason Morales — Founder, SolarEnergyPH