Planning tool with sourced ranges; not engineering, electrical or financial advice. Cut load first; grid power stays your baseline.

1. Where and what

Choose your city and dwelling, set people and air-conditioners, tick appliances to get kWh per day, peak watts and surge watts, and pick what must keep running in an outage.

2. Physics

Solar yield by month, hot-hour temperature loss, wind power from speed cubed (measured wind needed), micro-hydro from head and flow, and usable battery energy.

3. Build your stack

Set solar, battery, generator and EV sizes. See supply against use, backup or no backup, capex, cost per kWh, space, noise and permits.

4. Brownout countdown

Hours of autonomy for three critical-load tiers: phones, lights and fan; plus fridge; plus one air-conditioner. A red box shows under 12 hours.

5. Your plan

Pick a 72-hour, 14-day, 90-day, 12-month or 3-year barangay plan, see it as a timeline, download it as a calendar file, print the checklist, copy a share link or save it on this device.

This planner needs JavaScript for its calculators. The five steps in plain text. (1) Where and what: pick your city and dwelling, count people, list your appliances and add up kWh per day, peak watts and surge watts, and decide what must keep running. (2) Physics: solar kWh per day = kWp x local yield x derates; wind power = half x air density x area x speed cubed x Cp (needs measured wind); hydro watts = 1000 x 9.81 x head x flow x efficiency; usable battery = nominal x depth of discharge x efficiency. (3) Build your stack and read supply, cost per kWh, space, noise and permits. (4) Brownout countdown: hours = usable storage / (critical load minus recharge). (5) Pick a 72-hour, 14-day, 90-day, 12-month or 3-year barangay plan, with milestones you can put in your calendar.

Grid-tied solar alone switches off in a brownout. Backup needs a battery, a generator or an EV.

Solar yield by city, kWh per kWp per day (annual average, low-high, modelled)

City	kWh/kWp/day
Manila	3.1-4.1
Quezon City	3.0-4.1
Cebu City	3.3-4.4
Davao City	3.1-4.3
Baguio	3.2-4.5
Iloilo City	3.0-4.3
Cagayan de Oro	3.2-4.3
Zamboanga City	3.6-4.6
Legazpi	3.1-4.3
Tuguegarao	2.8-4.1
Puerto Princesa	3.4-4.5
General Santos	3.3-4.4

Critical-load tiers

Tier 1: phones, router, lights and a fan: 0.51-2.33 kWh/day (modelled)
Tier 2: tier 1 plus the refrigerator: 1.31-5.53 kWh/day (modelled)
Tier 3: tier 2 plus one air conditioner: 5.31-19.93 kWh/day (modelled)

Methods compared

Grid-tied rooftop solar (net metering): 2.11-5.6 PHP/kWh; backup in an outage: no
Hybrid solar + LiFePO4 battery: 2.7-16.66 PHP/kWh; backup in an outage: yes
Portable power station (LFP, integrated inverter): 11.29-86.29 PHP/kWh; backup in an outage: yes
UPS (standby/line-interactive/online): UNVERIFIED PHP/kWh; backup in an outage: yes
Generator (gasoline inverter / diesel): 53.6-87 PHP/kWh; backup in an outage: yes
Micro-hydro (run-of-river): UNVERIFIED PHP/kWh; backup in an outage: yes
Small wind turbine: UNVERIFIED PHP/kWh; backup in an outage: yes
Biogas digester (cooking gas first): UNVERIFIED PHP/kWh; backup in an outage: yes
Solar water heater and solar cooker: UNVERIFIED PHP/kWh; backup in an outage: yes
EV backup: V2L (appliance outlet) and V2H (whole-home): UNVERIFIED PHP/kWh; backup in an outage: yes

Plans

First 72 hours: be reachable and safe (3 days): List the critical loads and their watts; Decide where hardware goes: outdoors for engines, ventilated non-bedroom for batteries; UPS for the router or PC (minutes of bridge); Portable power station for tier 1 (about 1 kWh)
Two weeks: audit, quotes and paperwork (14 days): Load audit with a clamp meter and 12 months of bills; Confirm the right to install: master deed, HOA, landlord; Collect three written quotes with bill of materials; Prepare the net-metering application with the utility
Ninety days: permits, install, commissioning (90 days): Engineer design: roof structure, string layout, battery location; LGU electrical permit and DU application; Install 5 kWp grid-tied PV on a verified roof; OR install 5 kWp hybrid with 10 kWh LFP (replaces the grid-tied line)
Twelve months: net metering, monitoring, battery plan (365 days): Net-metering agreement and meter swap; Log monthly kWh and compare with PVGIS lo-hi; Clean panels after dry spells; check connectors; Budget the battery replacement year
Three years: a 1,000-household barangay microgrid (1095 days): Form the operating body and measure demand; Pick the legal path: co-op, QTP/MGSP under RA 11646, or DU extension; Phase 1: solar + battery for critical loads (clinic, school, pump, hall); Phase 2: household connections at scale

Order of preference: cut load first; grid-tied solar for daytime loads; hybrid solar plus LiFePO4 for backup; power station or UPS for critical loads; generator for rare long outages (never indoors); hydro or wind only with measured head, flow or wind; biogas for cooking. Ranges, not promises. Output depends on your roof, your sun, your loads and your installer. Not engineering advice. Electricity can kill. Batteries, generators and wiring need a licensed electrician, permits and ventilation. Not safety certification. Grid status as dated; supply decisions belong to DOE, NGCP, ERC and the utilities. We do not forecast outages. Contact: manilaopenhouse@gmail.com