How to Read Your Meralco Bill Before Going Solar
Read your Meralco bill line by line before requesting a solar quote. Find your kWh, identify your rate schedule, and know exactly what solar can offset.
Why solar starts with your bill
Every solar quote you’ll ever receive starts with the same question: how many kWh does your home consume in a month? The answer isn’t in your peso amount. It’s a specific line on your Meralco bill that most homeowners never look at.
Before requesting quotes from installers, pull out your last three Meralco bills. This guide walks you line-by-line through what matters, what you can safely ignore, and how to translate your bill into a sizing conversation with an installer.
The 6 lines that actually matter
Meralco’s monthly bill contains 20+ line items. Most are informational or fixed charges. For solar sizing, only six matter:
- Kilowatt-hours (kWh) used — the total energy your home consumed this billing period. Solar is sized against this number.
- Billing period dates — typically ~30-32 days. Solar production is compared against monthly consumption.
- Rate schedule — “RS” (residential single-phase) is standard. “RSP” (residential single-phase with time-of-use) is optional.
- Generation charge (per kWh) — the largest variable component of your bill. Solar directly offsets this.
- Transmission + system loss charges (per kWh) — smaller per-kWh components. Solar offsets these too.
- Total amount due — what you actually pay. Solar’s target is to reduce this by 60-90%.
Everything else on the bill — taxes, franchise fees, universal charge, missionary electrification, feed-in-tariff allowance — are per-kWh riders that scale with your consumption. Solar reduces them proportionally.
Finding your kWh
Look for the line labeled “Kilowatt-Hours Used” or “kWh Consumption” in the top-right or middle-right of your bill. It’s usually shown as a large number, typically 300-1,500 for QC residential homes.
For solar sizing, we want three months of kWh data to smooth out seasonal variations. If your last three months show:
- January: 720 kWh
- February: 780 kWh
- March: 890 kWh (hot dry season, aircon load spikes)
Your monthly average is ~800 kWh, and your annual maximum is ~1,000 kWh. Solar systems are usually sized to cover 80-90% of the monthly average, with headroom for seasonal peaks. That’s a 5-6 kWp system range — see our cost breakdown by system size.
Rate schedule: RS vs RSP
Most QC homes are on Rate Schedule RS (residential single-phase, non-time-of-use). This means you pay the same generation rate whether it’s 2 PM or 2 AM.
A minority are on RSP (residential single-phase with time-of-use). Here, peak-hours consumption (typically 8 AM-8 PM) costs more per kWh than off-peak. RSP customers benefit more from solar because their expensive daytime peak consumption is exactly what solar offsets.
To find your rate schedule, look for “Rate Class” or “RS” on the upper-left of your bill. If you’re on RS but consume most of your electricity during the day (WFH, home office, midday aircon), ask Meralco about switching to RSP — it may improve your solar economics further.
Fixed vs variable charges
Not every peso on your Meralco bill is offsettable by solar. Charges break down as:
- Variable per-kWh charges (offset by solar): generation charge, transmission charge, system loss charge, taxes, universal charge, feed-in-tariff allowance
- Fixed monthly charges (NOT offset by solar): distribution demand charge, metering charge, franchise tax on distribution, RA 7832 (systems loss recovery on distribution)
For a typical QC residential bill, fixed charges run ₱200-₱500/month. This means even a perfectly sized solar system that produces 100% of your consumption will still generate a monthly Meralco bill of that fixed amount. It’s not a defect — it’s your ongoing grid membership fee.
How much of my bill can solar offset?
For a typical QC residential home:
- 60-70% offset — smaller system sized for daytime consumption only (3 kWp on 700 kWh/month)
- 70-85% offset — well-sized system (5 kWp on 700 kWh/month) with modest evening consumption
- 85-95% offset — well-sized system with battery storage capturing daytime excess for evening use
- 95%+ offset — oversized system with battery, generally uneconomic unless resilience is the goal
Most QC installations land at the 70-85% offset range on a grid-tied-only basis. That’s the sweet spot: substantial bill reduction without the cost of adding batteries. See when to add batteries if resilience matters more than pure ROI.
Bill patterns that suggest oversizing
Before an installer sizes your system, watch for signs that you might be about to oversize:
- Bills with big month-to-month swings — suggests seasonal aircon load. Size to average, not maximum.
- Very low nighttime consumption — suggests you can get by with a smaller system + no battery, because most of your consumption is daytime.
- Home mostly empty during workday — solar production goes back to grid for credit under NMP, but you may want to check whether the credit rate makes this economic.
- Consumption dropping year-over-year — household changes (kids moved out, LED replacement) can shift the sizing conversation.
Send us three months of Meralco bills via the form below and we’ll flag any of these patterns during our initial review.
Frequently Asked Questions
What if I don’t have physical bills?
Log into the Meralco Online portal or the Meralco Mobile app. Your consumption history for the past 12 months is available. Screenshot the kWh column and share with your installer.
Should I get 3 months or 12 months of history?
For basic sizing, 3 months is enough. For precise sizing (especially aircon-heavy homes with seasonal variance), 12 months is better because it captures the summer peak vs. December low.
Does my rate schedule affect what solar can save?
Yes. RS customers save based on flat kWh offset. RSP (time-of-use) customers can save more because solar directly offsets expensive peak hours. If you’re a daytime-heavy household on RS, ask Meralco about switching to RSP after installation to maximize savings.
What if my kWh includes a business/commercial component?
If you run a home business with significant load, your Meralco account may be on GS (General Service) rate rather than RS. Different rate structure, different net-metering math. Share your bill during initial contact so we can advise correctly.
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Send Us Your Bills for Real Sizing
Attach your last 3 Meralco bills through the form below and we’ll come back with a size recommendation and projected offset for your specific home. Or start on the Residential Solar page →