PV Power Generation Solution

A photovoltaic (PV) power generation system turns sunlight into electricity using solar panels, an inverter, and, when the system must run without the grid, a charge controller and battery bank. Most small and mid-size systems fall into three types: grid-tied (feeds your building and the utility grid), off-grid (runs on batteries, no grid needed), and hybrid (grid-tied with battery backup). The right choice depends on one question: does your site have reliable grid power?

Inverter.com supplies the core components for these systems: solar panels, charge controllers, grid-tied, micro, off-grid, and hybrid inverters, solar pump inverters, and wind turbines. The four scenarios below show how to put them together, with sizing examples you can adapt to your own site.

Which PV System Type Fits Your Site?

 

System type	Best for	Core components	Battery needed?	Products
Grid-tied	Homes and small buildings with utility power, aiming to cut electricity bills	Solar panels, grid-tied or micro inverter	No	On-grid inverter, Micro Inverter
Hybrid (grid + battery)	Grid-connected sites that also want backup power	Solar panels, hybrid inverter, battery	Yes	Hybrid Solar Inverter
Off-grid	Cabins, farms, remote sites without utility power	Solar panels, MPPT controller, battery, off-grid inverter	Yes	Off-grid inverter, MPPT Solar Charge Controller
Solar pumping	Irrigation, livestock water, remote water supply	Solar panels, solar pump inverter, pump	No (water tank instead)	Solar Pump Inverter, Solar Water Pump
Solar + wind hybrid	Off-grid sites with complementary sun and wind	Solar panels, wind turbine, two charge controllers, shared battery	Yes	Wind Turbine, Wind Turbine Charge Controller

Table of Contents

• 🔴Scenario 1: Residential Rooftop Grid-Tied System
• 🔴Scenario 2: Off-Grid Cabin, Farm or Remote Site
• 🔴Scenario 3: Solar Water Pumping
• 🔴Scenario 4: Solar + Wind Hybrid Power
• Inverter.com Components at a Glance
• Distributed vs. Larger-Scale PV: What Is the Difference?
• Before You Install
• Advantages and Limitations of PV Power
• Frequently Asked Questions

Note: The sizing figures below are illustrative examples based on stated assumptions. Peak sun hours, losses, and loads vary by location and equipment, so use them as a starting point, not a final design.

🔴Scenario 1: Residential Rooftop Grid-Tied System

Background

A homeowner with utility power wants to offset daytime electricity use. Panels on the roof generate DC power, a grid-tied inverter converts it to AC, and the home uses that power first. Surplus power flows to the grid, subject to the local utility's rules.

Challenges

• Choosing between a string inverter and per-panel microinverters, especially with partial roof shading.
• Matching array size to the household's actual consumption.
• Understanding that a standard grid-tied system shuts down during a grid outage.

Recommended Solution

 

⚡ Challenge	🔧 Solution	✅ Result
Shading from chimneys, trees, or vents	Use microinverters, which track each panel separately	One shaded panel does not drag down the whole array
Simple, unshaded roof	Use an on-grid inverter with panels in series strings	Fewer components for a straightforward layout
Want power during outages	Choose a hybrid solar inverter with a battery	Critical loads keep running when the grid is down

• Most grid-tied inverters and micro inverters include built-in MPPT, so a separate charge controller is not needed unless the system includes batteries.

Reference Configuration (Illustrative)

 

Item	Value
Household consumption	20 kWh/day
Peak sun hours (location-dependent)	4.5 h/day
System efficiency (wiring, temperature, inverter losses)	80%
Required array size	20 ÷ (4.5 × 0.8) ≈ 5.6 kW
Panels at 400W each	14 panels

• Check each inverter or micro inverter's rated power and input voltage range on its product page to decide how many units the array needs.

Expected Outcomes

• Daytime household loads are supplied directly by solar.
• Surplus generation can be exported where the local utility allows it.
• A clear sizing method you can repeat with your own consumption and sun hours.

🔴Scenario 2: Off-Grid Cabin, Farm or Remote Site

Background

Where utility lines are unavailable or too costly to extend, a battery-based PV system supplies all the power. The panels charge the batteries through an MPPT charge controller, and an off-grid inverter converts battery DC into AC for appliances and tools.

Challenges

• Sizing the battery bank to cover cloudy days without oversizing it.
• Matching panel voltage and current to the charge controller.
• Running 120/240 V North American loads from a battery system.

Recommended Solution

 

⚡ Challenge	🔧 Solution	✅ Result
Cloudy days and night loads	Size the battery for 1–2 days of autonomy	Power continues through low-sun periods
Maximizing panel output	Use an MPPT solar charge controller; a PWM controller suits small, simple systems	Better harvest from the same array
120/240V appliances	Use a split-phase off-grid inverter	Both 120V and 240V loads can be served

Reference Configuration (Illustrative)

 

Item	Value
Daily load	3 kWh/day
Autonomy	2 days → 6 kWh
Usable battery depth of discharge	80% → 7.5 kWh battery capacity
Battery bank voltage	24V → 7,500 ÷ 24 ≈ 312 Ah
Array size (4 peak sun hours, 70% efficiency)	3 ÷ (4 × 0.7) ≈ 1.1 kW
Charge current	1,100 W ÷ 24 V ≈ 46 A → with ~25% margin, a 60 A controller class

• Choose an off-grid inverter based on continuous load plus the starting surge of motor loads such as pumps and compressors, which can briefly draw several times their running power. Use solar connectors rated for your array current for the DC wiring.

Expected Outcomes

• Reliable power at sites with no utility service.
• Battery and controller sized from the load, not guesswork.
• Room to expand the array later by checking controller current and voltage limits first.

🔴Scenario 3: Solar Water Pumping

Background

Irrigation and livestock watering often happen in fields far from the grid. A solar pump inverter runs the pump directly from the PV array, pumping water whenever the sun shines and storing it in a tank for later use. No battery bank is needed.

Challenges

• Diesel or grid-powered pumps have ongoing fuel or electricity costs.
• Batteries add cost and maintenance at remote sites.
• Sizing the array to the pump's actual hydraulic demand.

Recommended Solution

 

⚡ Challenge	🔧 Solution	✅ Result
Fuel and electricity costs	Power the pump from a PV array through a solar pump inverter	Pumping runs on sunlight
Battery cost and upkeep	Store water in a tank instead of storing electricity	No battery bank to maintain
Matching the pump to the job	Pair with a solar water pump sized for flow and head	Daily water target met with a right-sized array

Reference Configuration (Illustrative)

 

Item	Value
Daily water target	20 m³/day
Total dynamic head	30 m
Overall pump system efficiency (assumed)	40%
Electrical energy needed	1,000 × 9.81 × 30 × 20 ÷ 3,600,000 ÷ 0.4 ≈ 4.1 kWh/day
Array size (5 peak sun hours, 75% efficiency)	4.1 ÷ (5 × 0.75) ≈ 1.1 kW

• Confirm that the array's open-circuit voltage stays within the pump inverter's DC input range before wiring panels in series.
• Related reading: For pumps powered from AC mains, see the Frequency Inverter Solution for variable-speed pump control.

Expected Outcomes

• Water delivered during daylight hours with no fuel supply.
• Simpler system without batteries.
• A repeatable formula for estimating array size from flow and head.

🔴Scenario 4: Solar + Wind Hybrid Power

Background

Solar and wind often complement each other. In many locations, the sun is strongest in summer and at midday, while wind can be stronger in colder months or at night. Combining both on one battery bank can smooth out generation and reduce the battery capacity needed to ride through low-resource periods.

Challenges

• A single source leaves generation gaps.
• Solar panels and wind turbines have different charging characteristics and must not share one controller.
• Wind turbine installation depends on site wind conditions and tower height.

Recommended Solution

 

⚡ Challenge	🔧 Solution	✅ Result
Generation gaps	Add a wind turbine alongside the PV array	Charging continues when the sun is weak
Different charging behavior	Use an MPPT solar charge controller for the array and a dedicated wind turbine charge controller for the turbine	Each source is regulated correctly
Choosing a turbine style	Compare horizontal axis, vertical axis, and spiral types for your site	A turbine suited to local wind and space

Reference Configuration (Illustrative)

 

Component	Role
1 kW solar array + MPPT controller	Main daytime charging
Small wind turbine (few hundred watts to about 1 kW class) + wind controller	Charging during wind events, including at night
Shared 24 V battery bank	Common storage for both sources
Off-grid inverter	AC power for loads

• Follow each controller's manual for wiring, battery connection order, and any required protection for the turbine.

Expected Outcomes

• More consistent charging across seasons and weather.
• Reduced reliance on oversizing the battery bank.
• A modular system you can grow one source at a time.

Inverter.com Components at a Glance

 

Solar panels	Solar charge controllers	Solar inverters	Solar connectors	Solar water pumps	Wind Turbines

 

Component	What it does	Browse
Solar panels	Convert sunlight to DC power	Portable Solar Panel
Charge controllers	Regulate charging of battery systems	MPPT, PWM
Inverters	Convert DC to AC for loads or grid	Solar Inverter
Connectors	Connect panels and strings	Solar Connector
Pumps	Move water with solar power	Solar Water Pump
Wind generation	Add a second energy source	Wind Turbine

• For help choosing an inverter type, see the Solar Inverter Solution. For backup AC power from batteries, see the Power Inverter Solution.

Distributed vs. Larger-Scale PV: What Is the Difference?

 

	Distributed (residential / small commercial)	Large commercial rooftop	Utility-scale (centralized)
Typical location	Rooftops, balconies, ground mounts, farms	Warehouses, logistics parks, large roofs	Dedicated solar farms
Main equipment	Panels, grid-tied, micro, off-grid or hybrid inverters	Panels, combiner boxes, multiple grid-tied inverters, AC grid-tie cabinet	Large arrays, central inverters, step-up transformers, medium/high-voltage switchgear, SCADA
Power use	Mostly self-consumed, some export	Mostly consumed on site	Fed to the grid

• The product categories on this page are aimed at residential, small-scale, and off-grid systems. Larger commercial and utility-scale plants require engineered designs that go beyond catalog components.

Before You Install

1. Grid-tied systems: Contact your local utility about interconnection and export rules, and check permit requirements with your local building department.
2. Rooftop systems: Local electrical code requirements, such as rapid shutdown rules, vary by jurisdiction. Confirm them before installation.
3. Battery systems: Size wiring, fuses, and breakers for the full battery current, and follow the manuals for installation and grounding.
4. Not sure about compatibility? Our team can help with product selection and compatibility questions before and after purchase. Contact us.

Advantages and Limitations of PV Power

Advantages

• Sunlight is free and renewable, with no fuel supply and no emissions or noise during operation.
• Panels can use existing roof or ground space, and generation happens where power is used.
• Systems are modular, so capacity can grow in steps.
• Maintenance needs are low compared with engine-driven generators.
• Works at sites with no utility service, such as remote farms and cabins.

Limitations

• Output varies with weather, season, and time of day, so off-grid systems need batteries or a backup source.
• Roof orientation, tilt, and shading affect production.
• Up-front equipment cost is high, and battery storage adds more.
• Standard grid-tied systems stop producing during a grid outage unless designed for backup.

Frequently Asked Questions about PV Power Generation

• Q1: What is the difference between grid-tied, off-grid, and hybrid solar systems?
  A grid-tied system feeds your building and the utility grid and needs no battery. An off-grid system runs entirely on batteries and works without the grid. A hybrid system is grid-tied but adds a battery so key loads keep running during an outage.
• Q2: How big a solar system do I need?
  Divide your daily energy use in kWh by your location's peak sun hours multiplied by system efficiency (typically 0.7 to 0.8). For example, 20 kWh/day ÷ (4.5 × 0.8) ≈ 5.6 kW.
• Q3: Do I need a charge controller with a grid-tied system?
  Usually not. Most grid-tied inverters and micro inverters include MPPT. A charge controller is needed when panels charge batteries, as in off-grid and many backup systems.
• Q4: Will a grid-tied system work during a power outage?
  A standard grid-tied system shuts down during an outage as a safety measure. To keep power on, use a hybrid system with a battery or an off-grid setup.
• Q5: Can solar panels run a water pump without batteries?
  Yes. A solar pump inverter runs the pump directly from the PV array. Water is pumped during daylight and stored in a tank, so no battery bank is needed.
• Q6: Why combine solar and wind power?
  The two sources often peak at different times of day and year, so together they can keep a battery bank charged more consistently. Each source should use its own charge controller feeding the same battery bank.
• Q7: Do I need a permit or utility approval?
  Grid-tied systems typically require permits and utility interconnection approval, and rules vary by location. Check with your local building department and utility before installing.