Do Solar Panels Cool Your Home?

On these hot summer days, the sun shines directly on your roof and has a heating effect that permeates into your home. Is it true that solar panels can cool your home? Absolutely!

A study conducted by the UC San Diego Jacobs School of Engineering completed tests with various solar panel layouts and tested roof temperatures with thermal imaging.

Solar Installation in Vancouver. Roof Thermal Imaging & Cooling effect!

Researchers discovered that exterior roof temperatures were 5 degrees Fahrenheit cooler with solar panels, as the panels blocked direct sunlight from hitting the roof. Also, the solar panels contributed to lowering roof temperatures because the panels themselves were reflecting the sun’s heat away from the building. Overall, the solar panels “reduced the amount of heat reaching the roof by about 38%!”

In addition to cooling your home during the Summer, solar panels also add an insulation value in the Winter by helping to keep warm air inside your home. How great is that? These factors alone make your home more energy-efficient and are estimated to provide a 5% payback of the solar panel system cost!

To learn more, visit our page for more information.

Do you have more questions about solar panels? Contact us today as we’re happy to answer your questions and even provide you with a Free Estimate!

Can You Connect Solar Panels Directly To Battery?

A typical solar system has a charge controller situated between the solar panels and the battery. But is it that necessary? Can you connect solar panels directly to a battery? What would happen if you do?

A solar panel generates up to 20 volts, which is higher than the 12 volts required by a battery. Connecting the solar panels directly to the battery could overcharge and damage the battery.

What Happens If You Connect Solar Panels Directly To A Battery?

When sunlight hits the cells on a solar panel, it produces a chemical reaction and generates direct current (DC). The solar panel transmits this current into the battery. The current is used to charge the battery and can also be used to run appliances and other devices.

If the solar panel is directly connected to the battery, all of the currents are placed in the battery. A 12V battery needs only 12 volts, at most 14.4.V to charge. A 12V solar panel produces up to 20V.

If you put 20 volts in a 12-volt battery, it will overcharge. This is going to damage the battery and whatever device or appliance is connected to it.

By installing a charge controller like the Renogy 30A Charge Controller, this can be avoided. You place the charge controller between the solar panels and the battery, and it will regulate the current flowing into the system.

Why A Charge Controller Is Needed To Connect Batteries To Solar Panels

A charge controller manages the electrical current going into the battery, keeping it at a safe level. This device ensures the battery charges at the optimum level without the risk of overheating or overcharging. Some of the most important features of a charge controller are the following.

• Display: the controller should display the solar panel amps, battery bank voltage, and charge level.
• Customizable lighting control: for simplified operation
• Auto low voltage connect / disconnect: turns on when the battery is charged and turns off when power is low
• Multistate Charging: adjusts the battery power according to the battery’s charge level for optimum performance.

The battery installation depends on the solar panel system design. A lot of home solar panel systems today come with an inverter that simplifies battery configuration. If your system does not come with battery expansion capability, you have to replace the inverter.

Lead-acid batteries are the most widely and with good reason. Their electrical storage capacity is large and they discharge fast. However, lead-acid battery levels should not drop below 50% as it will shorten the lifespan.

Lead-acid batteries often have 2 V voltage and are made up of cells that generate the required power. In solar power batteries, that is 12 volts. These are called deep cycle batteries because they charge during the day and are discharged at night.

Sot the best way to avoid this is to install a charge controller. The controller will protect the battery and ensure only the right amount of current goes into the system. The following step-by-step guide shows you how it is done.

How To Connect A Charge Controller To A Battery And Solar Panel

Instead of connecting a battery directly to a solar panel, you should install a charge controller between the battery and the solar panel. The solar panel will charge the battery with current but the controller ensures only a safe amount goes into it. The following steps show how it is done.

Required Tools And Materials

• Solar panel
• Charge controller
• Battery charge
• Inverter (if you will use AC powered appliances)
• Cable, wires, and connectors (these should be included in your solar panel kit)
• Crescent wrench
• Drill
• Screwdriver
• Electrical tape
• Wirecutter
• Eye protection (goggles are recommended when working with lead-acid batteries)
• 12V deep cycle battery – we recommend 4.0 kWh Royer Lithium Battery 310 AH (LiFePo4)

The basic steps are:

1. Connect the charge controller to the lead battery.
2. Link the lead battery into the inverter.
3. Connect the charge controller to the solar panels.
4. To run, use the inverter to convert DC to AC, Clamp to the battery and turn the inverter on.

Step By Step Instructions

1. Prepare all the tools and materials. Set up the solar panel so you can link them to the main connector later on. Layout the panels first. Depending on your setup, an extension cord may or may not be required.

The wires should be covered for protection. If the battery is not yet charged, do this first. It’s a good idea to charge the battery while you set up the solar panels to save time. Make certain the battery’s negative terminal is on one side and the positive terminal on the other.

If your battery is already parallel, proceed to step 3. If not, cut the cables and make some jumpers. The bigger the inverter, the longer the cable, but chances are your solar panel already has cables ready.

2. Hook up the charge controller onto the lead battery. There should be a wire on the controller that you can hook up or clamp onto the battery. The inverter must be turned off first. If the controller is waterproof you can position it anywhere. If it isn’t, make sure it is in a secure location.

Charge controllers come with digital displays for easy access to your system, so the best place to install them is in your RV. When installed properly, you can use the controller to monitor the energy situation in your RV.

3. Hook up the lead battery to the solar inverter. The battery can be configured parallel to the other batteries in the system. To add more batteries, connect them with cables. Make sure the cables are linked to the proper terminals.

4. Link the battery controller to the solar panel. Run the line from the panel to the controller and it should be set. Depending on your setup, an extension cord may be required to connect the components.

Tips And Warnings

To test the system, turn on the inverter to convert DC to AC. Clamp to the battery and then activate the inverter. If everything is in order the system should run fine. Try different devices and check for signs of problems. Here are some more suggestions:

• If you already bought a solar kit, follow the instructions given. Keep in mind that some of the steps in your solar panel kit may differ slightly. If you don’t want to manually put the whole thing together, look for solar panel system kits that require very little setup.
• Double-check the wiring and cables. Make certain the connectors are tight and in the proper locations.
• Run a test first to see if it works. Keep an eye on the charge controller and check if it’s controlling the voltage.
• If the system does not run, check the wiring or if there is a loose screw somewhere. It is also possible the batteries are not installed correctly so look there first.
• Your solar system kit comes with a manual and troubleshooting guide so use that as a reference.

How Long Does A Solar Panel Take To Charge A 12V Battery?

The charging time depends on the solar panel watt capacity and how much sunlight is available. It also depends on the battery and how much power is required.

A 12V 100ah battery holds up to 1200 watts. A 100-watt solar panel can produce 600 watts with six hours of sunlight. So if the weather is ideal, a 100W solar panel can recharge a 12V 100ah battery in two days.

That assumes the two days have full sunlight so the solar panel can produce 100 watts for six hours. In reality, this can only happen under the most ideal situations. Passing clouds, shading, and other factors affect solar power output. if the conditions are not good, it might take 3 days or so to recharge the battery.

What Are The Parts Of A Solar Power System?

Now, let’s take a look at the 4 main components: the solar panels, the charge controller, the inverter, and the battery. The following information makes it clear why you should never connect the batteries directly to a solar panel unless it runs off DC power.

Solar Panel. These are the most recognizable parts of a solar system. Also called solar stations or solar cells, these are available in different configurations. The most popular solar panels are those with 36 cells, capable of producing 18 to 21 volts.

Inverter. Solar panels produce direct current (DC) which is then stored in the battery. To use this power for home appliances, you need an inverter to convert it into an alternating current (AC). The inverter must be joined to the battery before it is connected to other AC appliances or devices.

Your solar battery generates 12-volt power, but the inverter changes this into 120 volts, making it usable and compatible with electrical devices. Inverters come in various forms and some are bundled with portable solar system kits.

Battery. The battery serves as the repository of all the energy that the solar panel produces. For RVs and home use, a 12V, deep cycle battery is recommended. These batteries can handle several discharges, which is what you’ll be needing. Without the battery, there is nowhere to store all the power the solar panel generates.

Solar Charge Controller. A battery charge controller acts as a voltage regulator for your solar power system. Think of the voltage regulator that you use with your computer and you get an idea of what a batter charge controller does.

Conclusion

Connecting solar panels to the battery is a simple, straightforward process, provided you know the steps. A lot of the mistakes people make is not taking the time to learn how a solar panel system works with batteries. By understanding the process you’ll save yourself a lot of trouble.

If you frequently use utility vehicles such as pick-up trucks or golf carts, you need a sustainable source of battery power to help keep them moving and operational. That’s where the importance of lithium batteries can most benefit you. At Hub Power, we provide deep-cycle lithium batteries in BC and are a prime distributor of solar and power conversion products. 

We also specialize in solar on-grid packages in BC and will detail the benefits of deep cycle lithium batteries for your utility vehicle. We’ll go over what exactly these batteries are and how they work, as well as their duration of the operation.

What Are Deep Cycle Batteries and How Do They Function?

Deep cycle batteries are premium, lightweight, and very efficient batteries that offer the most powerful options for different required usages as they’re designed to produce a steady power output over a long period of time. After the discharge has been used significantly, it’s recharged to complete the cycle. Some of the features include rapid charging, deeper charging cycles, continuous charge, and discharge capability. 

How these deep cycle batteries work is through the use of lithium iron phosphate that offers improved discharge and charges efficiency. This helps with the battery’s ability for deep power cycles. While deep cycle batteries are often priced with a large price tag, they can deliver great value and benefits for your utility vehicles over time. Moreover, these types of batteries have a longer service life compared to other lead-acid or lower quality lithium batteries and require little or no maintenance. It’s overall a worthwhile investment for people managing different vehicles and a great long-term solution.

What Is The Lifespan Of A Deep Cycle Battery?

So how long do deep cycle batteries last? As we mentioned before, they can power your utility vehicle for a long time. Depending on how you use it and how powerful the battery is, the life cycle can last you several charging cycles. You also have to consider temperatures and other factors before you use the battery. 

Deep cycle batteries currently average around 2,000-4,000 charging cycles at 80% of rated capacity. This is better in comparison to the 400-1,500 cycles you would get from lead-acid batteries. By a rough estimate, deep cycle lithium batteries can last you five years or more of functional operation in contrast to just two years from lead-acid batteries. They also need to be maintained and may require water replacement to avoid serious structural damage in the future. Otherwise, you may risk shortening their lifespan. 

What Is The Difference Between A Lithium Battery And A Deep Cycle Battery?

Standard lithium batteries and deep cycle batteries have many similarities and differences and both have their strengths and weaknesses. We’ve gone over a few of them already, but it’s worth repeating if you want to base your decision on the details. 

Deep cycle batteries weigh 30% less than lithium acid batteries and can reach 100% charge and discharge with around 80% of great efficiency. They also have longer charging cycles than lithium batteries and offer strong stability in terms of voltage power. 

While lithium batteries are cheaper than deep cycle batteries, investing in the latter can greatly benefit you in the long run. Moreover, lithium batteries and other similar products have dangerous lead content that can be dangerous for yourself and the environment. Deep cycle batteries use sustainable lithium technology that is cleaner and safer for the environment than other products. 

All in all, you will find many uses and benefits if you consider purchasing deep-cycle lithium batteries for your utility vehicles. While it may be an investment, you can be assured that you’ll get great results from your purchase. 

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Inverters are a key component of any solar panel system: while solar panels convert sunlight into electricity, inverters ensure that you can use the electricity they produce in your Home, RV, Boat, or cabin.

There are three primary inverter setups: string inverters, inverters + power optimizers, and microinverters. String inverters are the oldest, original technology: they are a proven, durable, and cost-effective option that has been installed for decades throughout the world. That said, microinverters and power optimizers are newer (but not new!) technologies and have been increasing in popularity over the last decade, especially in the residential market. In this article, we focus specifically on the capabilities of microinverters and compare that to the capabilities of adding power optimizers to a string inverter.

A note about power optimizers

Microinverters and power optimizers are comparable technologies – so comparable that some companies describe them as interchangeable (Never to do!) Both are collectively referred to as “Module-Level Power Electronics,” or MLPEs, but there are important differences between these setups that may make them more or less suitable for your installation.

Microinverters vs. power optimizers: compare and contrast

Microinverters and power optimizers are comparable technologies – so comparable that some companies describe them as interchangeable (but we would never!) Both are collectively referred to as “Module-Level Power Electronics,” or MLPEs, but there are important differences between these setups that may make them more or less suitable for your installation.

Similarities between microinverters and power optimizers

Let’s start off with the similarities between microinverters and power optimizers:

• Microinverters and power optimizers help improve performance for solar panels on complicated roofs, or roofs that experience marginal shading during the day.
• Both microinverters and power optimizers can monitor the performance of individual solar panels, meaning you can assess the number of kilowatt-hours (kWh) one solar panel in your array produces versus another.
• Typically, solar companies install one MLPE (i.e. microinverter or power optimizer) on the back of each individual solar panel. So, if your system has 20 solar panels, that often means 20 microinverters or 20 power optimizers.

Top 4 differences between microinverters vs. power optimizers

While microinverters and power optimizers provide many of the same benefits, the two technologies also have many differences, as explored in greater detail below:

1. Where direct current (DC) converts to alternating current (AC)

Microinverters convert DC energy into AC energy right at the panel site. While power optimizers are also located behind a solar panel, they don’t convert the electricity on their own; instead, optimizers “condition” the DC energy and send it to a central inverter that finishes the conversion process. The conditioning process fixes the voltage of the DC energy so that the centralized inverter can more efficiently convert it to AC energy.

2. Warranty

Both microinverters and power optimizers come with 25-year warranties. However, while optimizers are warrantied for 25 years, the centralized inverter that they pair with may have a shorter warranty. Installers often offer an extended warranty on the central inverter, either as part of their package deal or at an additional price.

Additionally, it’s important to take a close look at what’s included–and what’s not–in a company’s warranty terms. Does the company cover installation labor, replacement and the shipping of parts? And what is the claim process like for getting a warranty processed? All of these are important considerations when choosing the type of inverter to install on your property.

3. Maintenance

Over the lifetime of microinverters and power optimizer systems, you need to consider if and how many times they’ll fail, as well as the impact of an unlikely failure on the production of your solar panel system. In the event that an individual inverter fails, it will likely cost more to replace a microinverter or a power optimizer located on a roof than it will replace a string inverter on a wall at ground level, given the labor required to access and work on your roof.

However, that’s only part of the calculus around lifetime maintenance costs. The leading microinverters are warrantied for 25 years, whereas many string inverters are only warrantied for 12 years, implying that you might have to replace your inverter mid-way through the lifetime of your solar panels.

4. Battery options

Both microinverters and power optimizers are compatible with battery storage. However, depending upon whether you want a DC or AC coupled battery solution, you may need to use a particular type of inverter. If you’re considering battery storage, it’s a good idea to talk to your installer or electrician about which inverters work best with your battery of choice.

Microinverters vs. power optimizers: choosing the right option for your system

Microinverters and power optimizer systems have very similar efficiencies, are good for monitoring individual panel performance, and can help maximize energy production on slightly shaded or complicated roofs. But your preferences will ultimately determine which option is best for your home.

It’s important to keep in mind that microinverters and optimizers certainly aren’t the only options available – if you’re looking for the most economic option and have a south-facing roof with little shade, string inverters are the way to go.

String Inverters

String inverters are significantly larger than their aptly named counterpart.  String inverters are roughly 3′ tall x 1.5′ wide x 1′ deep or approximately the same size as a water cooler.  String inverters are typically mounted next to the electrical panel or can also be mounted outside.  The major downside to string inverters is that shading on one solar panel can negatively impact the entire array (or string within the array).

Key Advantages:

• Most cost-effective inverter system
• Scalability for large/commercial solar arrays

String inverters should be used when:

• solar modules are mounted at the same pitch/azimuth
• a large-scale project is desired
• an unobstructed ground-mounted solar array is desired

Compare your inverter options to find the best match

As a consumer–and a shopper on EnergySage–you have the power to explore both your microinverter and power optimizer options. Start by reviewing the different manufacturers offering the two types of technologies, and then Contact Us – our team would be happy to provide you with no-obligation quotes that you can easily compare side-by-side to find the best solar panel system to fit your needs.

The Cost

String inverters are the most cost-effective but are only applicable in select circumstances.  Because of string inverters’ selectivity, microinverters and DC optimizer systems are gaining market share.

Both microinverters and DC optimizers are fairly comparable in cost.  If there is no room in your home or building for a string inverter, then micro may be more applicable.  Similarly, if you are planning a large installation, DC optimizers’ scalability may give them the edge.  Deciding a clear-cut winner between optimizers and micro inverts is a difficult task and one that can only be evaluated as the technology develops and inevitable corporate feuds ensue.

Additionally, the cost of various inverters’ may be impacted by CE Code rule changes and international trade issues (such as tariffs on one country or technology type).

Part of what we do at Power My Home is regularly evaluating what inverter systems are of the best quality and value for the given conditions. It is in everyone’s best interest to make sure you have the best product options at the lowest prices.

Reference Article I

Mike’s Truck Camper – Photo from 2018

Solar power systems are an increasingly popular solution for both off the grid and on the grid power generation. They’re cost-effective and convenient, with solar panel kits widely available for any purpose.

With that being said, you should know that lots of different solar system components go into any system. With so many essential components, it can be helpful to understand why they’re necessary.

What Are the Main Components of Your Solar System?

Remember that you don’t just need to grab one of each of these solar system components and call it a day. You need to make sure they all work together properly. That also means finding dependable, quality brands that you can count on.

Solar Panels?

Of course, solar panels themselves are a big part of your solar electricity system. You can get panels today in a wide range of sizes, providing power in the range of 80 to 300 watts or more per panel.

The number of panels you’re going to need in Canada will vary widely depending on the size of your home and the specific region, due to how much the climate can vary. You could find yourself needing between 7,000 and 15,000 watts of capacity. How can you know how much you need? Find out with our solar panel calculator.

Make sure to go with systems designed for Canada, in particular, when setting up panels to power your home. Efficiency will rely on panel placement, which should always face south for maximum sun exposure. They should also be set up with a tilt of roughly 30 degrees. You can optimize this placement using your exact latitude.

You’ll also have to look into the options for polycrystalline or monocrystalline solar arrays. These are the two main types of panels. Monocrystalline is generally more efficient, although they can be more prone to damage.

Charge Controllers

You can’t simply plug your solar cells into a battery or the grid and hope for the best. You need a charge controller to manage electricity production.

Charge controllers prevent your batteries from taking in too much charge and becoming damaged. There are two different types: maximum power point tracking (MPPT) and pulse width modulation (PWM). Each device provides different levels of control.

The main difference to consider when choosing these solar system components is the voltage. PWM charge controllers require that panel and solar batteries match. MPPT charge controllers require the solar panel operating voltage to be about five volts higher than the battery charging voltage.

You should always check beforehand that your solar system components will work properly together.

Inverters

A primary problem when implementing a solar energy system is that solar panels put out DC power, whereas the electrical grid and your home’s electrical system run on AC power. That means you need to convert from DC to AC. To do that, you need inverters. Systems that aren’t grid-tied typically use a battery-based inverter to keep things simple.

Many solar energy systems will use string inverters. These are designed to run power that’s generated from multiple panels or a single inverter. This arrangement can be even more cost-effective with combiner boxes that connect multiple string inverters.

Running all of the panels in your solar power system can lead to efficiency issues because the weakest link will limit output. Microinverters provide a designated inverter for each panel, preventing this problem. The trade-off is that having more inverters costs more money than simply opting to go with string inverters.

Racks and Mounts

The mounting system that holds your solar panels is fundamental, especially in areas that get heavy snow. You need to make a deliberate choice that factors your region and individual needs.

The most common type of racking is roof-mounted. This keeps all of your solar system components safely out of harm’s way and should give your panels the most unobstructed sunshine possible.

You always want to make sure that a roof-mounted system is properly installed to prevent damage to your roof like leaks.

When roof mounting isn’t possible, some homeowners choose to go with ground mount for their solar electric systems. With this setup, racking is arranged at the appropriate angle to support the panels on the ground. This makes reaching them for cleaning and maintenance easy but can also leave them open to any potential hazards at ground level.

Finding an area without trees or other objects to obstruct ground-level sun exposure can also be hard and in some cases, impossible.

When neither of these options is possible (or for some specific applications), pole-mounted solar panels could be the way to go. These panels are installed on poles, which means that they’ll be high up and get excellent sun exposure but don’t require installation on your roof.

Every situation is unique, so it’s up to you to decide which type of mounting system is suitable for your home and region.

Solar Batteries

It wouldn’t do you much good to only have electricity when the sun is shining at its peak! That’s why batteries are integral solar system components. They give you storage capacity, which means that your solar power system can deliver electricity even after the sun goes down. They’re vital when you want to get the most out of your solar panels.

Your battery bank will be one of the most expensive components of your solar power system, so you need to make sure that you’re getting just what you need. There are two primary choices for solar system batteries: AGM and lithium.

AGM batteries use the same lead-acid chemistry that traditional car batteries do, but with a major upgrade. The absorbed glass mat that gives them their name prevents hydrogen gas release, a major problem for the safety and longevity of traditional lead-acid batteries.

These new batteries provide great storage capacity, safety, and reliability. They’re also relatively inexpensive.

Lithium batteries are also available for solar power systems (think electric vehicles). The main issue is that they’re much more expensive than AGM batteries and they don’t like cold weather.

With that being said, in every other category, they pull ahead. Lithium batteries can handle more charge cycles. They’re also safer and easier to maintain, and they last longer than AGM batteries.

Lithium batteries present a significant price trade-off, so both options are still worth considering.

A Backup Power Source for Your Solar Energy System

You should never rely on a solar energy system without having a backup power source available. When damaged or failed solar system components bring down your system, you don’t want to go without electricity until you can repair or replace them. Installing a backup power source ensures that you’ll always have reliable access to electricity.

For many homeowners, their backup power source is simply the existing electrical grid. Grid-tied systems are standard for installing solar energy systems anywhere other than the most remote locations. This arrangement is simple and convenient but isn’t always the right choice for everyone.

If you look at any kind of facility that can’t go without electricity for even a moment, they’ll have standby diesel generators. They’re incredibly reliable, relatively easy to store the fuel for, and less expensive than some other options. However, if your reason for going solar is environmental, you will likely shy away from the idea of a diesel generator.

Depending on your location, you might investigate wind turbines or even water wheels for backup power. However, these two are subject to many conditions. For real emergencies, even the most environmentally conscious families should have a portable gasoline generator to ensure they don’t go without the absolute necessities. (Please go ahead and share your comments and thoughts below)

System Maintenance:

Taking proper care of your solar power system is essential to the system’s longevity and efficiency.

Almost anywhere in Canada will get more than enough rainfall to keep panels clean. If you do notice them getting dusty during a particularly dry spell or otherwise covered in debris, you can simply spray your panels down with a household hose.

During the winter, you’ll have to keep them clear of snow for them to work. There are extendable tools designed for this task that make clearing snow a breeze. Whatever you do, never try to defrost panels with hot water. The temperature difference will crack the panels right away.

Learn more about Solar:

It’s easy to make sure that you get everything you need and that it’s all compatible and high-quality when you go with solar power components from Power My Home.