Posted hours tell customers when the door is open. They do not tell a solar assessment when the site is actually drawing power. Generation follows daylight. The bill follows a billing cycle. Those two clocks only help a proposal when they are lined up against the hours equipment really runs.
Weekday, weekend and daytime loads change the brief for that reason. A roof size and a monthly kilowatt-hour total can look the same for two businesses and still describe two different jobs for an array. We start with the operating calendar, then the equipment schedule, then the closed-day pattern, because those three facts decide how much generation the site can use on the premises and how much is left over.
Opening Hours And Equipment Hours Are Separate Records
Opening hours are a customer-facing timetable. Equipment hours are an electrical one. They overlap on many trading days, and they diverge as soon as something keeps running after the last sale, or sits idle while the door is unlocked.
Record the published schedule first: weekdays, Saturdays, Sundays, public holidays, seasonal stretches and any planned change in shifts. Then, separately, list the larger loads and when they typically run. Do not collapse those lists into one line such as open 9 to 6. Air handling, computing, lighting, kitchen plant or production equipment may follow a different clock from the front desk. Staffed hours also are not the same as process hours. A site can be open for customers while the heavy plant is off, or closed to the public while plant is still running.
Treat continuous loads as a category you select, not as a fact we assume about your site. If refrigeration continues after closing, write that down. If security lighting, cameras or communications equipment stay on overnight, write that down. If machinery only runs on particular production days, write those days down. If none of those apply, leave them off. The point is to stop a proposal from treating the trading day as the only day the meter moves.
Expected changes belong on the same sheet. Additional equipment, longer hours, a second shift or a quieter season all alter daytime demand. Flag what is current and what is planned so the brief does not mix a future load into today’s pattern without saying so.
We help businesses organise operating hours, load information and site readiness for a commercial solar assessment. The operating schedule helps us ask better questions about demand before the site survey.
Daytime Overlap Is The Load The Array Can Serve
Solar modules generate while the sun is on the roof. They do not generate to a sales roster. For business daytime electricity use, solar generation can only serve load that is already on while the array is producing.
Meralco puts the same idea in language written for homes that still holds for a commercial meter: take note of the appliances that will be operating when sunlight is available, because that is what determines the energy you need while the array is working. Its net-metering guidance also tells customers to understand their electricity usage pattern, or load profile, and peak consumption so a solar PV system can be sized to match those needs. That is a matching principle, not a measured saving for your site.
Electricity used while the panels are generating is different from excess electricity exported to the grid. Solar self-consumption for a business is the first of those two. Generation serves the loads that are already drawing power. Only the remainder, at that moment, is available to export. If the site is quiet while the array is productive, more of the output leaves the premises. If the site is drawing power through the same hours, more of the output stays on the premises.
Those two outcomes are not interchangeable on the bill. For a Meralco-served property, exported energy is recorded and converted to bill credits once the account is enrolled, the bi-directional meter is in place, and testing and commissioning are complete. The property still imports from the grid when demand exceeds generation, and that import is charged. Other distribution utilities use their own procedures. Confirm the current rules with the utility that actually serves the account.
A business that already runs through daylight therefore presents a different overlap from an evening venue or a site whose main demand is seasonal. The roof does not settle that difference. The operating day does. Using generation on site is an operations question. Receiving credits for export is a utility programme. Do not read a large roof as proof of either.
Weekdays And Closed Days Are Different Electrical Days
A busy weekday and a quiet weekend can look very different to a solar system even when the monthly total is unremarkable. Trading days concentrate people, process loads and air conditioning. Closed days often leave only the background equipment that nobody turns off.
Compare those schedules qualitatively before anyone talks about savings. On a trading day, ask which large loads run in the morning, through midday and into late afternoon. On a closed day, ask what still runs: perhaps nothing material, perhaps refrigeration, perhaps security and IT. Weekend solar export for a business is leftover generation when Saturday or Sunday demand falls while the array still produces. That describes a quiet day. It is not an instruction to change how you trade.
Public holidays and half-days belong in the same comparison. A site that closes at noon still has afternoon sun. A site that opens only in the evening has little daytime overlap even if the monthly kilowatt-hours are high. Seasonal trading, school calendars, production campaigns and inventory days all create the same kind of mismatch if they are invisible in the brief.
Compare the trading-day schedule with the closed-day schedule. That shows when generation may meet an operating load and when more could be left for export. If you already have interval readings for the meter, bring them alongside the calendar: they can show detail that opening hours alone cannot. Keep any changes in shifts or equipment use beside the dates they started, rather than treating every day as an average day.
A Monthly Bill Does Not Prove Timing
A bill is a settlement document. It is useful, and it is not a load profile. The front of a typical bill shows consumption and charges for a billing period. It does not show whether those kilowatt-hours were used at 11:00 while the array would have been generating, or at 21:00 when it would not.
Bring recent bills with the kilowatt-hour consumption visible. If use changes substantially through the year, more than one bill gives a better picture. The amount paid is context. Tariffs and bill components mean the peso total is not a direct measure of the solar equipment you need.
Meralco calculates export credits using a generation-based charge, not the full retail rate. On a Meralco account, following ERC directions, credits for exported electricity use the monthly blended generation charge, excluding other generation adjustments. Transmission, distribution and other retail components are not credited on the same basis as the generation component. That is why an exported kilowatt-hour should not be assumed to cancel an imported kilowatt-hour on a one-for-one retail basis. Confirm the current wording with Meralco if that is your utility. Credit rules are time-sensitive and do not automatically apply to every distribution utility in the Philippines.
Unused credits on a Meralco net-metering account are described as banked and rolled to succeeding bills, and Meralco states that those credits do not expire. Enrolment still depends on the programme rules that apply to the account. Buying equipment does not create those credits. Completing the utility process does.
Monthly totals also hide closed-day behaviour. A site can use most of its energy on five trading days and still show a respectable monthly figure. An array discussed only from that figure has no instruction about the two days when demand drops. The calendar supplies that instruction. The bill does not.
Export Credits Follow Utility Rules
Grid connection and on-site use should stay in separate columns of the brief. Generation can supply the property while it is available. Permission to export, measurement of export and the value of export credits sit with the distribution utility.
For Meralco, net-metering is described as a programme under RA 9513 for a renewable energy facility of up to 100 kW, with excess electricity exported to its grid receiving a corresponding bill credit. A bi-directional meter measures import and export. Meralco also states that even a system intended only for own consumption should be notified to it for electrical safety and stable service, and that operating without the right metering can record export as if it were import. Those are utility and safety points. They do not replace the operating calendar.
If the property is not on the Meralco network, use that utility’s current interconnection process. Do not copy a Meralco credit rule onto another franchise. Do not treat a commercial quotation as permission to energise a system.
Backup is a third column. Lower daytime grid use and keeping a critical process running through an outage are different objectives. Ordinary grid-connected solar is not emergency power. Meralco’s commissioning guidance includes anti-islanding: the PV system must disconnect during a grid outage so it does not energise lines. If outage supply matters, that is a hybrid and essential-load discussion, not a reason to blur opening hours with backup circuits.
Collect The Operating Calendar First
Collect a blank operating schedule rather than waiting for a promised saving figure. Fill it from management knowledge, not from a sales target.
On trading days, write door hours, typical staffed hours, and the hours the larger named loads run. On closed days, write what still runs, if anything, and whether weekends differ from public holidays. In the daytime window, mark which of those loads are on while sunlight is available, without claiming a generation forecast. Add planned changes: extra equipment, longer shifts, quieter months, or a move. Add the site information that affects readiness: who can approve roof work, lease or shared-facility limits, access restrictions, and a site contact. Attach recent bills with kilowatt-hour totals, plus interval data only if you already have it and choose to share it. Keep equipment documentation with the load names so the brief is not a list of anonymous boxes.
Where a figure is unknown, write unknown instead of inventing a tidy number. A missing load can be investigated. A guessed load presented as fact cannot. Do not open electrical enclosures or take measurements unless a qualified person is doing that work.
Then compare any proposal against that calendar. Ask how the system scope relates to the operating profile and how it deals with periods of low on-site demand. Ask what is included for mounting, protection, cabling, testing and utility coordination, and what remains outside the price. A panel count that ignores Saturday downtime is not a complete commercial scope.
Weekday, weekend and daytime loads change a business solar proposal because they change the overlap between generation and demand. They do not, by themselves, prove a peso result. We put the operating pattern, property constraints and equipment requirements into one commercial brief. We do not infer a technically suitable capacity from a photograph or a bill total.
Once the calendar is in order, continue with a business solar assessment so roof rights, electrical supply, system role and utility route sit next to the hours you actually operate. Bring the schedule, the bills and the person who knows when equipment runs. That is enough to start a serious comparison. The survey still has to see the roof and the connection. The utility still has to approve any export.
Collect the business operating calendar and the actual equipment schedules, including closed days, then compare a proposal with when energy is used rather than with a promised savings figure. Opening hours matter because they are the first draft of that calendar, and they are only useful when the equipment hours and the quiet days are written beside them.