Solar Power System for a Poultry Farm's Exhaust Fans and Lights

Start by listing every load the system has to carry: each exhaust fan's rated running watts, each light fixture's watts, and how many hours per day both run. Poultry houses often run exhaust fans on a thermostat or timer rather than continuously, so the real number to use is hours of actual run-time, not hours the farm is open. Multiply each load's watts by its daily run-time hours to get watt-hours per day, add every load together, and that total is the daily energy the solar system has to generate and, if batteries are included, store. Divide that daily watt-hour figure by the expected sun-hours for the farm's location in the Philippines, typically four to five peak sun-hours depending on province and season, to get the panel output the system needs. This is the same math whether the farm has two exhaust fans or twenty: the system is sized to the load, not to a fixed package. Because poultry ventilation is often needed around the clock in hot months, it is also worth sizing for the farm's worst case day, the hottest week when fans run longest, rather than an average day. Philvolt builds the system from this load calculation rather than selling a fixed size, and will ask for the farm's actual fan and light inventory, including each unit's nameplate wattage and daily run schedule, before quoting. Getting this load figure right the first time avoids under-sizing a system that cannot keep fans running during a heat spike, or over-paying for panel capacity the farm will never use.

Exhaust fans used in poultry houses are motor loads, which means two numbers matter, not one: running watts, which is what the fan draws once it is spinning, and starting watts, which is the surge the motor pulls for roughly half a second when it first switches on. That starting surge is commonly two to three times the running watts for a single-phase induction motor, and it is the number that determines whether an inverter can start the fan at all, not just keep it running. A farm with several exhaust fans on the same circuit should check whether they start together or stagger, because fans starting at the same instant stack their surge loads, while staggered starts only ever hit the inverter with one fan's surge at a time. This is why inverter selection for a poultry farm is not just about matching total running watts: the inverter's surge or peak rating has to clear the single largest simultaneous startup event the farm's fan bank can produce. Light fixtures do not carry this surge problem the way motors do, so lighting load is simpler to add to the running total. When requesting a quote, farm owners should have the nameplate wattage, phase, and whether fans are wired to start together or on a staggered timer, since this single detail changes which inverter the system needs. Philvolt sizes the inverter to the surge case, not just the running total, specifically because undersized surge handling is the most common reason a farm solar system trips out the moment the fans cycle on.

Lighting in a poultry house is a smaller but steadier load than exhaust fans, and it is usually run on a longer daily schedule, sometimes most of the day and into the evening to regulate bird activity and feeding cycles. Because lighting watts are low per fixture compared to a motor, the lighting load is calculated the same simple way: watts per fixture times the number of fixtures times hours of daily use equals watt-hours per day. The practical difference from exhaust fans is that lighting rarely has a startup surge worth planning around, so it adds cleanly to the panel sizing total without forcing a bigger inverter. Where lighting does matter for system design is battery sizing, if the farm wants power through a brownout or past sunset: because lights run on a predictable, non-weather-dependent schedule, they are usually the easiest load to size battery autonomy around. A farm owner planning this project should count every fixture by wattage, not assume all fixtures match, since poultry houses frequently mix older fixtures with newer, lower-wattage ones installed over time. Philvolt asks for this fixture-by-fixture count as part of the same load intake used for exhaust fans, so the lighting and ventilation loads are sized together as one system rather than as two separate add-ons.

A poultry farm has to decide whether the solar system is grid-tied, meaning it works alongside the Meralco or local cooperative connection and exports excess power through net metering, or whether it includes batteries for autonomy during brownouts, since exhaust fans that stop during a heat spike can be a real animal welfare and production risk. A grid-tied system without batteries is the lower cost path and still cuts grid draw during daylight hours when fans and lights are running, but it will not keep fans running if the grid itself goes down. Adding batteries means sizing storage to cover the farm's daily watt-hour total, calculated earlier from the fan and light load, for however many hours of autonomy the farm wants to plan for, which is a decision based on how often and how long outages actually happen at that farm's location. Philvolt handles the net metering application process for grid-tied installations, so the farm does not have to deal with the utility paperwork directly. Because battery autonomy requirements vary so much by farm size, fan count, and how exposed the area is to outages, there is no single standard battery size that fits every poultry operation, which is exactly why the load calculation from the fan and lighting sections has to come first, before any battery or panel count is quoted.

Philvolt covers installations across Luzon and runs the project end to end: load assessment, system design, installation with its own crew, and the net metering application if the system is grid-tied. For a poultry farm specifically, that means the quote is built from the farm's actual fan and fixture inventory rather than a generic commercial package, which is the detail most general solar sites skip. Farm owners considering this should have their exhaust fan nameplates, fixture counts and wattages, and daily run schedule ready when they request a quote, since that is the information Philvolt uses to size panels, inverter surge rating, and any battery autonomy the farm wants. Quote on request, with full system and warranty terms provided at that stage rather than listed as a fixed number upfront, since poultry farm loads vary enough from site to site that a one size figure would not be accurate.