Wattage Calculator
Generator Wattage Sizing Calculator
Stop guessing. Calculate exactly what size generator or battery power station you need to survive the next LUMA blackout.
Size Your Solar & Battery Backup for Puerto Rico Apartments
surviving frequent LUMA energy blackouts and voltage fluctuations (bajones de luz) is a top priority for apartment and condominium residents in San Juan, Bayamón, Carolina, and Guaynabo. However, combustion gas generators are strictly prohibited on balconies under local fire codes, carbon monoxide safety regulations, and HOA noise rules. Safe, silent, and fume-free battery power stations paired with portable folding solar panels are the only legal emergency backup power solution for high-density urban living.
Use the apartment presets below to calculate your energy demands and get a customized battery capacity and solar panel recommendation. Power stations and solar panel kits are available for direct shipping to Puerto Rico.
Generator Wattage Sizing Calculator
Select the appliances you plan to run at the exact same time during an outage to estimate your power needs.
⚠️ Do not select every appliance you own. Only select the items you will power simultaneously to avoid overestimating.
Start With a Preset
Select your situation and adjust from there.
Apartment
House
Refrigerator/Freezer150W / 700W
0
Inverter Refrigerator80W / 250W
0
Chest Freezer100W / 500W
0
Microwave (1000W)1000W / 1000W
0
Coffee Maker1000W / 1000W
0
Toaster850W / 850W
0
Blender400W / 850W
0
Rice Cooker700W / 700W
0
Electric Pressure Cooker1000W / 1000W
0
Air Fryer1200W / 1200W
0
Electric Griddle1500W / 1500W
0
Deep Fryer1500W / 1500W
0
Electric Oven/Range2000W / 2400W
0
Dishwasher1200W / 1500W
0
Countertop Ice Maker150W / 200W
0
Washing Machine500W / 1500W
0
Electric Clothes Dryer5400W / 5400W
0
Gas Clothes Dryer700W / 1800W
0
Clothes Iron1200W / 1200W
0
Electric Water Heater4500W / 4500W
0
Electric Showerhead Heater (Ducha)3500W / 3500W
0
Cistern Pump (1/2 HP)800W / 2000W
0
Cistern/Tank Pump (3/4 HP)1200W / 3000W
0
Pressure Booster Pump500W / 1500W
0
Well Pump (1/2 HP)1000W / 3000W
0
Sump Pump (1/2 HP)800W / 2100W
0
Ceiling Fan75W / 120W
0
Pedestal/Standing Fan75W / 75W
0
Box Fan100W / 100W
0
Inverter AC (9k BTU)700W / 1000W
0
Inverter AC (12k BTU)1000W / 1500W
0
Inverter AC (18k BTU)1500W / 2000W
0
Inverter AC (24k BTU)2200W / 2800W
0
Window AC (10k BTU)1200W / 3600W
0
Window AC (15k BTU)1800W / 5400W
0
Central AC (2 Ton)2800W / 8400W
0
Central AC (3 Ton)4500W / 13500W
0
Dehumidifier300W / 300W
0
Humidifier200W / 200W
0
LED/LCD TV80W / 80W
0
Cable/Satellite TV Box30W / 30W
0
Gaming Console200W / 200W
0
Modem/Router20W / 20W
0
Starlink Dish65W / 65W
0
Security Camera System (NVR)50W / 50W
0
Laptop Computer50W / 50W
0
Desktop Computer300W / 300W
0
Laser Printer600W / 600W
0
Inkjet Printer30W / 30W
0
Smartphone Charger10W / 10W
0
Tablet Charger20W / 20W
0
LED Bulb (x1)10W / 10W
0
CPAP Machine (no humidifier)50W / 50W
0
CPAP Machine (with humidifier)100W / 100W
0
Oxygen Concentrator300W / 300W
0
Baby Monitor5W / 5W
0
Pool Pump (1 HP)1500W / 3600W
0
Outdoor Water Pump (1/2 HP)800W / 2000W
0
Electric BBQ Grill1500W / 1500W
0
Outdoor String Lights (LED)50W / 50W
0
Mosquito Trap / Bug Zapper40W / 40W
0
Corded Drill600W / 900W
0
Circular Saw1400W / 2300W
0
Table Saw1800W / 4500W
0
Air Compressor (1 HP)1500W / 4500W
0
Shop Vac1000W / 1500W
0
Bench Grinder1400W / 2500W
0
Belt Sander1200W / 2400W
0
RV AC (13.5k BTU)1500W / 3500W
0
RV Refrigerator200W / 200W
0
Hair Dryer1800W / 1800W
0
AM/FM Radio50W / 50W
0
Running Watts
0W
Peak / Surge
0W
Daily Consumed
0Wh
Your station must satisfy both: output rating ≥ peak watts, capacity ≥ daily Wh needed.
Estimated Runtime
Runs indefinitely in normal PR sun conditions
☀️ Solar surplus: +0 Wh/day
💡 Recommended Setup
Select appliances from the left panel to get a personalized recommendation.
Solar Backup Sizing FAQs
Daily energy is calculated as: Appliance Running Watts × Daily Hours × Duty Cycle. Unlike continuous loads (like modems), cycling appliances like refrigerators and air conditioners do not draw constant peak power. We apply realistic duty cycles (e.g. 35% for fridges) to provide an accurate, cost-effective sizing recommendation.
In Puerto Rico, solar panels only generate power during the daytime (modeled at 5.5 peak sun hours). For the remaining 18.5 hours of darkness, your appliances must run entirely off the battery. To prevent overnight blackouts, your battery capacity must cover this overnight load, even if your solar panels produce a surplus during the day.
No, standard portable power stations cannot power major resistive heating loads like conventional water heaters (4,500W) or electric clothes dryers (5,400W). However, they can power electric showerhead heaters (duchas eléctricas, ~3,500W) if the power station inverter has a continuous output rating of 3,600W or higher.
To run indefinitely, your solar panels must harvest more energy during the day than your appliances consume in 24 hours (Daily Wh ÷ 5.5 peak sun hours). Additionally, your battery must be large enough to store that energy for nighttime use. For example, a 2,000Wh daily load requires at least 365W of solar panels and a 1,500Wh battery to run continuously.
Yes, but balcony installations typically yield 15–25% less power than roof installations due to shading and sub-optimal angles. If you place panels on an east or west-facing balcony, we recommend adding extra solar panel wattage to compensate and ensure your battery charges fully during the day.
The best solar generator setup for high-density apartments and condominiums is a portable, silent battery storage system (such as 2,000Wh–3,000Wh capacity) paired with folding solar panels placed on an east or west-facing balcony. Since combustion plants are strictly banned on balconies due to noise ordinances, HOA rules, and carbon monoxide risks, battery-powered stations are the only safe, legal emergency backup power option for apartment residents in Puerto Rico.