Choosing Solar Panels For A Solar Generator

 

If you’re looking for solar panels for your solar generator, this article will undoubtedly come in handy!

Solar generators offer a great energy solution for those who like exploring the outdoors without sacrificing the comfort that only electricity provides.

However, to unlock the full potential of your solar generator, you need to pair it with a good portable solar panel.

Choosing the best solar panels for your solar generator can be exhausting. So, in this article, we’ll answer a few common questions related to solar panels for charging solar generators.

 

How Are Solar Panels For Solar Generators Different?

Although they work the same way as fixed solar panels, solar panels for solar generators are designed to be fully portable. Most solar panels for solar generators are foldable to facilitate transportation.

 

 

Fixed solar panels (the ones you can mount on the roof of your RV, campervan, or house) are heavy and thick due to their many layers (including a glass layer) and aluminum frame.

Conversely, solar panels for solar generators are incredibly lightweight, compact, and portable, so you can easily take them on your camping trips and outdoor activities.

 

How Can You Connect A Solar Panel To A Solar Generator?

Connecting a solar panel to a solar generator is as straightforward as it sounds. You simply plug your portable solar panel’s output cable into your solar generator’s input port, and it should start charging.

However, when using third-party solar panels to charge your power station, things can get a bit complicated if the output plug from your solar panel is not compatible with the input port on your solar generator.

If that’s your case, don’t worry; we’ll show you a simple way around it shortly.

 

Common Types Of Solar Panel Connectors

Let’s first look at the types of solar panels output connectors commonly found on portable solar panels:

1. MC4 Connector

 

Primarily found on rigid solar panels, the MC4 connector is also used as the output plug for some foldable solar panels.

This connector is foolproof. You can’t connect it incorrectly as there’s only one way to do it.

Positive and negative ends are different from one another.

 

2. Anderson Powerpole Plug

 

Because newer solar generators usually have an Anderson port as an input option, this type of connector is becoming more frequently found as the type of output of portable solar panels.

It usually allows a current of 30A, making it a good option for charging a solar generator with multiple solar panels in parallel.

 

3. DC 8mm Plug

 

Because solar panels produce direct current power, DC outlets are a common input option for small solar generators, as they aren’t recommended for high amperages.

They are pretty simple, as there’s only one cable instead of the two cables on the Anderson Plug (a red one and a black one).

DC plugs come in various sizes, not only 8mm.

Solar Generator’s Input Ports (For Solar Power)

Depending on the brand, solar generators can have different solar input ports. However, they are usually one of the following options:

• Anderson power pole
• DC Input (8mm or other)
• XT60

 

Solar Panels’ Output Plug Adapters

If you decide to use a third-party solar panel on your solar generator, you need to consider both the type of output plug your solar panel offers and your solar generator’s type of input port.

If you decide to use a third-party solar panel on your solar generator, you need to consider both the type of output plug your solar panel offers and your solar generator’s type of input port.

If they’re compatible, great, you can plug it in, and your solar generator should start charging when you place the solar panel under direct sunlight.

However, if they are not compatible, you’ll need to use the correct adapter.

For example, let’s imagine you have a generic portable solar panel with an MC4 connector as the output plug, and you want to connect this solar panel to your solar generator. However, your solar generator has only a DC port as the solar input, so they’re incompatible:

In this case, to connect the solar panel to the power station, you would need to use an MC4 to DC adapter, like this one:

 

 

MC4 to DC 8mm adapter

Other types of useful adapters for similar situations are:

 

 

You can easily find these adapters on Amazon. Alternatively, you can make a DIY adapter if you have the skills by buying separate connectors and cables.

You now know how to connect any solar panel to any solar generator with the information provided.

However, plug compatibility isn’t the only factor you should consider when connecting a solar panel to a solar generator.

When choosing solar panels for a solar generator, it’s essential to consider the panel’s voltage, current, and wattage (rated power). The wattage is the amount of power that the panel can generate in full sun. For instance, you can’t charge a solar generator rated with 100W of a maximum solar input with a 200W solar panel.

It’s likely that your solar generator won’t charge, but it probably won’t suffer any damage because most solar generators have protection against overvoltage, overcurrent, and overload.

However, we advise you always to read the User Manuals to check if the solar panel’s output specs and solar generator’s input specs are compatible. This way, you’ll prevent any damage to your equipment and avoid safety risks.

 

How Many Solar Panels Can You Connect To A Solar Generator?

It depends on the rated solar input of your solar generator and the rated power output of your solar panel.

 

 

The total power delivered by your solar panel (or panels) should not exceed the maximum solar input that your solar generator’s built-in charge controller can handle. This “rule” will dictate how many solar panels you can connect to your solar generator.

Here are a few examples to make this concept easier to understand.

Example 1:

You have a small solar generator with a rated solar input of 100W max. Therefore, the power delivered by your solar system must not exceed 100W, regardless of how many solar panels you’re using. In this case, it would be recommended to use only one solar panel with 100W of maximum power output.

Example 2:

You have a medium-size solar generator as a backup system for occasional power outages and camping trips. Its rated solar input is 200W max. In this case, you can either connect a 200W solar panel or two 100W solar panels.

However, you should also consider your solar generator’s maximum voltage input and maximum current input to evaluate if connecting multiple panels is a real option or not.

Depending on how you pair the solar panels (in series or parallel), the output voltage or current can exceed the maximum rate for your solar generator. So make sure you do your research when connecting multiple solar panels to your solar generator.

Example 3:

You have an extensive solar generator system, for home backup power, with a total solar input of 2400W.

In this case, you can add as many solar panels as long as the maximum power (2400W), voltage, and current of the system are not exceeded.

 

Connecting Solar Panels In Series

A series connection is when you wire solar panels together by connecting the positive lead on one solar panel to the negative lead on another solar panel.

Solar panels connected in series

When you connect solar panels in series, the total output voltage of this system is the sum of the output voltage of each solar panel. The same goes for the wattage. However, the current is kept constant.

For instance, let’s say you connect three solar panels in series, with each panel rated for 100W of power output and an 18V open circuit. Therefore, this system’s total open circuit voltage will be 18V + 18V + 18V = 54V. The same way, the total output power will be 100W + 100W + 100W = 300W.

You would only be able to connect the solar system from the previous example to a solar generator that could handle the 300W of solar input and 54V of voltage input.

Here’s a simple scheme of how to wire solar panels in series.

 

Source: solar-electric.com

 

Connecting Solar Panels In Parallel

Parallel wiring requires the positive leads of the solar panels to be connected and the negative leads to be connected. A multibranch connector is then used to transform the many solar panel leads (positives and negatives separately) into a single lead that you can plug into the solar generator.

This method increases the current and the wattage output while keeping the voltage constant.

So if you wire two solar panels of 150W, 18V, and 6A (each) in parallel, then the total power output will be 150W + 150W = 300W, the total output current will be 6A + 6A = 12A, and the voltage will be kept constant at 18V.

This is a good wiring option for solar generators that accept a higher wattage but can’t handle high voltages.

Here’s a simple scheme on how to wire solar panels in parallel:

 

Source: solar-electric.com

 

Before connecting solar panels in series or parallel, chec

3k the user manual to see if they allow for this connection. Some small solar panels can’t handle being paired with other solar panels.

Furthermore, some solar panels can only be paired with solar panels from the same brand and with the same specs.

Keep these things in mind, and you shouldn’t have any problems connecting your solar panels.

 

Can Different Solar Panel Brands Be Used on The Same Solar Generator?

Separately, yes. If your different solar panels are compatible with your solar generator and if you respect your solar generator’s input specs, you should have no problem using other solar panel brands to charge it.

However, pairing solar panels from different brands (whether in series or parallel) is a more delicate matter.

 

Pairing Solar Panels From Different Brands

As previously mentioned, some solar panel manufacturers strictly advise against pairing solar panels from different brands.

That’s because each brand applies its own technology to its solar panels, so not all solar panels are compatible with each other.

Some are equipped with a microchip that controls input and output, while others are not. This difference in design and technology can result in the malfunctioning of your solar panels (from different brands).

Having said that, in most cases, if you have solar panels from different brands that have the same output specs (wattage, voltage, and amperage) and the manufacturers don’t explicitly advise against pairing them with other solar panel brands, then you shouldn’t have any problems doing so.

In any case, always read your solar panel’s user manual to check if they allow for such operation.

 

Can I Use My Solar Generator While Solar Panels Are Connected To It?

Yes, most solar generators support pass-through charging.

This feature allows you to charge devices connected to your power station while the power station itself is also being charged.

However, there are a few things you should be aware of:

1. Read The User Manual

Only in the user manual, you’ll find the information you need regarding pass-through charging.

2. Demand Should Not Exceed Supply

Be mindful of the amount of power being drawn for your power station while it’s being charged. If the power you’re drawing from the battery is greater than the power coming into the solar generator, your battery may not charge properly or never reach full charge. This can shorten the battery’s lifespan.

3. Charging Will Take Longer

As you use your solar generator you are depleting its energy. This means it will require more solar power to charge fully.

4. There’s An Increased Risk Of Overheating

While pass-through charging is safe, it can lead to excessive heating of your solar generator. Therefore, be aware of overheating your power station while solar panels are connected to it.

In conclusion, while pass-through charging is possible for most solar generators, it may shorten your battery’s life. Only use this feature if you need it. If you can avoid it, do so.

 

How Long Do Solar Panels Take To Charge a Solar Generator?

You can roughly estimate how long it would take to fully charge your solar generator using solar panels if you consider the maximum power output of your solar panels and the rated capacity of your solar generator.

With these numbers at hand, you can use the following formula:

Charging Time (hours) = Solar generator’s capacity (Wh) /

Solar panel’s maximum power output (W)

Here are a few examples:

Example 1: Using a 200W solar panel to charge a 500Wh power station

Charging Time (hours) = 500Wh / 200W = 2.5 hours

Example 2: Using a 200W solar panel to charge a 1000Wh power station

Charging Time (hours) = 1000Wh / 200W = 5 hours

Example 3: Using a 200W solar panel to charge a 2000Wh power station

Charging Time (hours) = 2000Wh / 200W = 10 hours

However, this is only an approximation. The rated power of solar panels corresponds to the maximum power it can deliver in ideal conditions.

Therefore, only in ideal conditions (only achieved in the controlled environment of a testing lab) a 200W solar panel will actually deliver 200W of power.

 

Factors that affect solar power production

In reality, solar panels deliver less than their maximum rated power. In addition, they don’t deliver the same amount of power all the time.

This happens because the ability of solar panels to generate electricity is affected by several different factors, such as:

The intensity of solar radiation

Orientation of the solar panel

Weather

Cloud coverage/shades

Temperature

Atmospheric pollution

Season

Time of day

Location

Angle in relation to the sun

Humidity

Heat buildup

To get a more accurate approximation, you can consider that the actual power delivered by your solar panel corresponds to 80% of its rated power.

This way, if your use a 200W solar panel to charge a 1000Wh solar generator, it would take 6.25 hours to charge fully:

Charging Time (hours) = 1000 Wh / (200W x 0.8) = 6.25 hours

Moreover, you can use a watt meter to measure the actual power output of your solar panel and use this number to calculate how long it would take to charge your solar generator.

Example: Let’s say you’ve measured the actual power output of your 200W solar panel and found out that only 174W is being delivered by it. In this case, to charge a 1000Wh power station, it would take:

Charging Time (hours) = 1000 Wh / 174W = 5.74 hours

Most newer solar generator models will display how much power is being delivered by the solar panels (aka the solar input) and automatically calculate and display how long it will take to charge the power station fully.

 

Final Thoughts

Solar generators are an excellent option for those looking to have access to clean and free energy on the go. Just plug a solar panel into it, and voila, you’ll start producing your energy.

However, choosing the right solar panels for your solar generator can be confusing. There are many different solar panels available, and not all of them will be compatible with your solar generator.

Therefore, when choosing solar panels for your solar generator, you should keep a few things in mind, like the solar panel’s output specs and the solar generator’s input specs.

Moreover, it’s essential to consider the size and weight of the panels. Larger panels will generate more power, but they will also take up more space. Smaller panels are more portable, but they will not generate as much power.

The best choice is to get a solar panel that will maximize the solar input of your solar generator without exceeding its wattage limit. You’ll ensure fast and efficient charging without damaging your solar generator or shortening its battery’s life.

 

Source: climatebiz.com  Written by Ana Lejtman