What the evidence says
Own-use zero export, net metering and other project routes have different export behavior, evidence and approval interfaces. The commercial label “rooftop solar” does not select the Philippine route.
A factory load is shaped by shifts, start-ups, compressors, pumps, refrigeration, process heat, maintenance and shutdowns. Annual or monthly kWh alone cannot establish safe capacity or self-consumption.
The DOE installer registry is a reference and expressly is not an endorsement. Listing does not prove the offered design, roof, protection, yield, workmanship, warranty or long-term support.
Practical decision guide
Design around production—not the module catalogue
Begin with the factory operating model. Reconcile at least twelve months of electricity bills with interval demand at the billing meter, shift calendars, weekly and seasonal production, start-up and shutdown sequences, maintenance days, generator tests, planned expansion and material changes in process. Map compressors, chillers, refrigeration, pumps, furnaces, ovens, motors, ventilation, clean rooms, water treatment, EV charging and other large or sensitive loads to the times when solar is available. Distinguish baseload, production-linked load, intermittent peaks and loads that disappear during weekends or shutdowns. Monthly kWh divided by an assumed solar yield cannot show self-consumption, reverse flow, clipping or curtailment. The study needs an auditable no-project baseline and multiple operating scenarios so capacity is not frozen around one unusual month or an outdated production plan.
Select the Philippine project route before pricing equipment. DOE Department Circular DC2026-08-0017 establishes policy for self-generating facility zero-export solar, while DOE and ERC net-metering rules define another route; larger, exporting, third-party or otherwise structured projects may require different interfaces. The point of connection, owner, host, offtaker, export behaviour, meter and responsible utility, LGU and professional parties must be explicit. DOE’s August 2026 public explanation describes streamlined steps for qualifying own-use systems and retains technical safeguards, but it does not give every industrial facility a blanket waiver. Confirm the current circular, distribution-utility process, service agreement, account class, building and electrical requirements and any local conditions for the actual factory. A salesperson’s label—rooftop, captive, PPA or zero export—does not determine the legal or technical route.
Qualify the roof and site as industrial assets. Obtain drawings and a measured survey; verify roof age, remaining warranty, corrosion, leaks, previous repairs, drainage, access, fire and maintenance routes, equipment zones and future roof replacement. A competent structural review must trace dead, live, wind and installation loads from module and clamp through rails, fasteners, purlins, trusses and foundations, including edge and corner zones and the condition of the existing structure. Coordinate penetrations, waterproofing, lightning and earthing, cable containment, fall protection, hot-work controls and shutdown permits with plant rules. Check flood and wind-driven-rain exposure for ground equipment, transformers and switchgear. Module and rack certificates do not qualify the factory roof as a complete system. Record exclusions and hold points before procurement so a late roof finding does not become a change order or unsafe workaround.
Study the electrical system at the intended point of connection. Rebuild or verify the single-line diagram, transformer and feeder ratings, fault levels, breaker duties, conductor capacity, voltage profile, power factor, harmonic environment, phase balance, earthing and existing generator, UPS, capacitor-bank and protection logic. Simulate minimum and maximum factory load, maximum PV, feeder outages, transformer maintenance and abnormal meter or communication conditions. If zero export is selected, define the control meter, sampling and command latency, fail-safe setpoint, inverter response, communications path, redundant or fallback behaviour and witnessed loss-of-signal test; a software checkbox is not an export-control study. Verify anti-islanding and required protection with the responsible utility and professionals. Conventional grid-following PV normally disconnects during a grid outage; it is not backup power unless an intentionally designed, permitted and tested island-capable architecture provides that function.
Build the commercial model from measured energy at defined boundaries. Compare the no-project utility bill with each solar scenario under interval self-consumption, export or curtailment, conversion and auxiliary losses, availability, degradation assumptions, production changes, shutdowns, tariff and contract changes, taxes, financing and insurance. Separate energy reduction from demand charges, minimum billing demand, power-factor effects and fixed items; solar may lower kWh without lowering the month’s billed kW. Include roof work, electrical upgrades, permits, production interruptions, cleaning, inspections, spares, inverter replacement assumptions, monitoring, cybersecurity maintenance, warranty exclusions and end-of-term removal or handback. Test smaller systems and operational alternatives, not only the seller’s maximum roof coverage. Report ranges and sensitivities with the assumptions exposed. A portal forecast or first-year peso-per-kWh comparison is not a verified lifecycle saving.
Turn the tender into an evidence and acceptance plan. Freeze the design basis, drawings, equipment and firmware register, module and inverter configuration, structural calculations, protection settings, zero-export sequence where applicable, cable and earthing schedules, monitoring points, cyber and data boundary, weather source, production model and performance assumptions. Require configuration-matched certificates and manufacturer documents, not brochures or reports from another model. IEC 62446-1 can guide documentation, inspection and commissioning for grid-connected PV, while U.S. DOE FEMP specifications offer procurement practice; neither source automatically approves a Philippine factory. Define factory and site tests, torque and insulation records, meter calibration, functional and protection tests, export-control failures, performance boundary, raw data, punch-list classes, retest and operator training before award. Link warranty start to accepted handover, not merely shipment or first energisation.
S3’s free initial factory solar evidence screen asks for twelve months of bills, available interval load, service agreement and tariff, production and shutdown calendar, roof drawings and known defects, single-line and transformer data, generator and UPS information, expansion plans, offers received, intended ownership and export route, target decision date and the decision owner. We return a bounded gap map identifying whether the smallest useful next step is data reconciliation, route confirmation, roof or structural review, connection and protection study, interval sizing, zero-export definition, commercial comparison or tender and acceptance specification. It is not a structural certificate, utility approval, energy-audit certificate, design sign-off or promise of savings. A later paid scope can be restricted to the evidence that changes the investment decision and coordinated with the responsible Philippine professionals and authorities.
DOE — DC2026-08-0017 own-use and zero-export solar policy
Discuss the engineering scope →What a business should do next
- Reconcile twelve months of bills with interval load, production calendar, planned expansion, downtime, generator tests and metering boundaries; identify when solar would be used, curtailed or exported.
- Freeze the evidence package before award: roof survey and load path, drainage and corrosion exposure, single-line, point of connection, transformer and protection study, zero-export logic where applicable, cybersecurity boundary, acceptance tests and O&M ownership.
- Request a free S3 factory solar evidence screen to identify the load, roof, route, protection, contract or acceptance gap that should be resolved before detailed paid engineering.