SolarEdge Home Hub: How Many Solar Panels to Charge in a Day

How many solar panels needed to charge a SolarEdge Home Hub in one day? That's the question you're here for. And the answer isn't a single number.

It depends on three things: your battery size, your local sunlight, and the wattage of the panels you choose.

In our research, the most common SolarEdge Home Hub setup uses a 13.5 kWh battery. A typical 400-watt panel in good sun produces about 2 kWh per day. Run the math, and you're looking at roughly 8 to 12 panels.

But the real answer is more interesting than that. Let's walk through exactly how to figure out your number.

Quick Answer

For a 13.5 kWh SolarEdge Home Hub battery, you need 8 to 12 solar panels. The exact number depends on your location and panel wattage. Use 400W panels with 5 peak sun hours.

That gives you roughly 10 panels. Winter months may require more.

Why Getting the Right Panel Count for Your SolarEdge Home Hub Matters

Getting the number wrong costs you real money. Undersize your array, and your battery never fully charges on a sunny day. You end up pulling grid power at night, which defeats the whole point of storage.

Oversize it, and you waste money on panels you don't need.

The Home Hub's inverter has limits too. Its maximum DC input power caps how many panels you can connect. Exceed that, and you get clipping.

The extra energy from your panels simply gets thrown away. That's wasted investment.

There's also the battery's maximum charge rate. A single 13.5 kWh unit can only accept about 5 kW of power at once. So even if your panels could produce 8 kW, the battery just takes what it can handle.

The rest goes to your home loads or the grid.

If you're new to the basics, check out our complete buying guide for a broader look at how residential solar works. It covers panel types, inverter choices, and system sizing at a high level.

The bottom line: you want a system that fully charges your battery on a typical day without wasting panel capacity. That's a sweet spot. And it's different for every home.

The Three Variables That Control Your Panel Count

1. Battery Size

SolarEdge sells the Home Hub battery in three usable capacities. The smallest is 9.7 kWh. The most popular is 13.5 kWh.

You can stack them to reach 19.4 kWh or more.

The bigger the battery, the more panels you need. Simple enough. But the relationship isn't linear.

A 19.4 kWh system doesn't need exactly double the panels of a 9.7 kWh system. That's because of efficiency losses, which we'll cover next.

2. Peak Sun Hours at Your Location

Peak sun hours (PSH) measure how much usable sunlight your panels get per day. A location that averages 5 PSH gets about 5 hours of full-strength sun equivalent.

The National Renewable Energy Laboratory (NREL) provides detailed solar data for every US location. Their PVWatts calculator is a free tool you can use to find your exact number. It's worth checking because PSH varies wildly.

Phoenix gets around 6.5 PSH on average. Seattle gets about 3.5. That's a huge difference.

A Phoenix homeowner might need 8 panels, while someone in Seattle could need 14 for the same battery.

3. Solar Panel Wattage

Residential solar panels typically range from 350W to 500W as of 2026. Higher wattage panels produce more power per square foot of roof space.

A 400W panel is the current sweet spot for most installations. It's efficient, widely available, and affordable. But if you have limited roof space, you might opt for 500W panels instead.

If you want to understand the different panel technologies, our article on the different types of solar panels explains monocrystalline, polycrystalline, and thin-film options clearly.

Here's the rule of thumb: higher wattage panels mean fewer panels total. But you still need enough total wattage to fill your battery.

How to Calculate Your Exact Panel Count (Step by Step)

Here's the actual formula. It's not complicated. You just need to plug in your numbers.

The Formula

Number of panels = (Battery capacity in kWh / (PSH × System efficiency)) / Panel wattage in kW

Let's break that down.

Step 1: Find your battery capacity

Check your SolarEdge Home Hub model. Common sizes are 9.7 kWh, 13.5 kWh, and 19.4 kWh. Use usable capacity, not gross.

Step 2: Get your local PSH

Use the NREL PVWatts tool or ask your installer. If you're estimating, pick a conservative number for your region. Winter sun is the real test.

Step 3: Account for system losses

No solar system is 100% efficient. We use a multiplier to account for losses. Here's what to include:

So your system efficiency is roughly 85%. That means you need to generate about 15% more energy than the battery holds to fill it completely.

Step 4: Choose your panel wattage

Let's assume a 400W panel. That's 0.4 kW.

Step 5: Do the math

For a 13.5 kWh battery with 5 PSH and 85% efficiency:

13.5 / (5 × 0.85) = 13.5 / 4.25 = 3.18 kWh needed per panel

Wait, that's not right. Let me redo the formula correctly.

The formula is: (Battery capacity / (PSH × Efficiency)) / Panel wattage in kW

So: (13.5 / (5 × 0.85)) / 0.4

First: 5 × 0.85 = 4.25

Then: 13.5 / 4.25 = 3.18 kWh of solar energy needed per day

Then: 3.18 / 0.4 = 7.94 panels

Round up to 8 panels. That's your baseline.

If you want to understand the actual science behind this conversion, our explanation of how solar panels generate electricity is a great read.

For winter, use a lower PSH value. If your winter PSH is 2.5, the same calculation gives you 15.9 panels. That's why some people install more panels than summer would suggest.

Real-World Examples: 9.7 kWh, 13.5 kWh, and 19.4 kWh Batteries

Let's run the numbers for the three common battery sizes. We'll use 400W panels and 5 PSH (good US average).

Those are summer numbers. Let's see what happens in winter with 2.5 PSH.

That's a big jump. It's why many homeowners in northern climates choose to install a few extra panels. They want to ensure the battery charges reliably even in cloudy months.

If you're considering the broader pros and cons of solar, our article on the advantages and disadvantages of solar panels covers the full picture. It's worth reading before you commit to a system size.

Also keep in mind your inverter's DC input limit. The SolarEdge Home Hub models have different caps. For the SE7600H, the max DC input is about 11.5 kW.

That's roughly 29 panels at 400W each. So you're fine for all three battery sizes.

Common Mistakes People Make When Sizing Panels for a Home Hub

Using Average Sun Hours Instead of Winter

This is the biggest mistake. Many people size their system for summer sun. Then they wonder why their battery doesn't fill in December.

Always size for your worst month. If you want year-round performance, use the lowest PSH value you'll see. That might mean adding 30% more panels.

Forgetting the Battery's Charge Rate Limit

The Home Hub battery can only accept so much power at once. A single 13.5 kWh unit has a max charge rate of about 5 kW.

If your array produces 8 kW, the battery only takes 5 kW. The extra 3 kW goes to your home or the grid. It's not wasted, but it doesn't help fill the battery faster.

Ignoring Inverter Clipping

Your inverter has a maximum DC input power. If you install too many panels, you'll exceed that limit on sunny days. The inverter clips the excess, meaning you lose potential energy.

The solution is to match your array size to the inverter's rating. Or use a slightly larger inverter if you plan to expand later.

Thinking More Panels Always Means More Charging

There's a point of diminishing returns. Once your array exceeds the battery's charge rate and the inverter's capacity, extra panels don't help. They just add cost.

The goal is a balanced system. Enough panels to fill the battery in a day, but not so many that you waste money on unused capacity.

For a deeper understanding of how the whole system works, our guide on how do solar panels work explains the conversion process from sunlight to usable electricity.

If you're still unsure, the SolarEdge monitoring app and the official Designer tool can help you simulate your exact setup. They take the guesswork out of the math.

Frequently Asked Questions About Charging the Home Hub with Solar

Can I charge my SolarEdge Home Hub from the grid instead of solar?

Yes, you can. The Home Hub supports grid charging as a backup option. But you lose the main benefit of solar storage.

Grid charging means you pay retail electricity rates to fill the battery. That rarely saves you money. Most homeowners use grid charging only during emergencies or when solar production is low for several days straight.

Do I need a specific type of solar panel for the Home Hub?

No, you don't need a special panel. The Home Hub works with any standard 60-cell or 72-cell residential panel. The key is that you use SolarEdge power optimizers on each panel.

Those optimizers communicate with the inverter. They handle the DC to DC conversion that makes the system work. Stick with reputable brands that offer solid warranties.

Will my battery charge on cloudy days?

It will, but much slower. A cloudy day might deliver only 10% to 25% of your normal PSH. That means your battery might only gain 1 to 3 kWh instead of a full charge.

The system still works. It just takes longer. If you have multiple cloudy days in a row, the battery may drain faster than it refills.

That's normal.

How long does it take to fully charge a 13.5 kWh battery?

With 8 panels at 400W each and good sun, you're looking at roughly 5 to 6 hours of peak production. That fills the battery in one day during summer. In winter with shorter days, it might take two days.

The battery's charge rate limits how fast it can accept power. So even with extra panels, you can't fill it faster than about 5 kW per hour for a single unit.

Can I add more panels later if I undersized my system?

Yes, you can expand. The SolarEdge system is modular. You can add panels and optimizers as long as your inverter has spare DC input capacity.

Check your inverter model's max DC input rating before you plan an expansion. If you're close to the limit, you might need to upgrade the inverter too. That's more expensive, so it's better to plan ahead.

Does the Home Hub work during a power outage?

It does, but only if you have the Backup Interface installed. That's a separate component that isolates your home from the grid during an outage. Without it, the system shuts down for safety.

With the Backup Interface, your battery powers your critical loads until the grid comes back. Your solar panels can also charge the battery during the outage if the sun is shining.

The Decision Guide: How Many Panels Should You Install?

Here's your final decision framework. It's a simple if/then flow based on your situation.

If you live in a sunny state (6+ PSH) and have a 13.5 kWh battery:

Install 8 panels at 400W each. That gives you reliable summer charging and decent winter performance. You'll fill the battery most days of the year.

If you live in a moderate climate (4 to 5 PSH) with the same battery:

Go with 10 to 12 panels. That extra buffer handles cloudy days and winter sun angles. You'll rarely need grid power.

If you live in a northern climate (3 to 4 PSH) or have heavy shade:

Install 14 to 16 panels. You need the extra capacity to overcome low sun hours. Your battery will charge reliably in all seasons.

If you have a 9.7 kWh battery (smaller system):

Reduce those numbers by about 30%. You need 6 panels in sunny areas, 8 in moderate areas, and 10 to 12 in northern climates.

If you have a 19.4 kWh system (two stacked batteries):

Increase by about 45%. You need 12 panels in sunny areas, 14 to 16 in moderate areas, and 18 to 22 in northern climates.

A final check on your inverter capacity:

You'll be well within those limits for any of the battery sizes we discussed. The inverter is rarely the bottleneck for residential systems.

One last piece of advice: work with a qualified SolarEdge installer. They have access to the SolarEdge Designer tool. That software runs a full simulation based on your roof, your location, and your exact equipment.

It takes the guesswork out of the math. Our comprehensive guide to the main components of a solar power system can help you understand what each part does before you talk to an installer.

The right number of panels is the one that fills your battery reliably all year, without wasting money on excess capacity. Use the numbers here as a starting point. Then let the official tools and a professional installer dial in the final count.