NOTE: As an Amazon Associate, I earn from qualifying purchases.  Learn More.

renogy 300w marine panels

Renogy 300 Watt Marine Solar Kit Review

Are you shopping for a high-quality marine solar power kit? 

In this review, we'll take a look at the Renogy 300w marine panels kit to help you decide if this particular item is meant for you.

The 300W Renogy marine solar kit produces a maximum of 2.5kWh per day on 8 hours of high sun, which is enough to recharge one 200aH 12V marine-grade AGM or Li batteries from 50% while keeping a 12V cooler cold, powering your LED lights and a small fan for hours, and recharge your electronics.   

With 30A of total input, this kit includes tough weather-resistant solar panels and a flush mount PWM charge controller to keep your batteries topped-up.

The installation is simple, and the package includes all of the brackets and connectors required for a secure marine-grade installation. 

300W of Solar Panels

The Renogy 300 Watt marine panels solar kit is specifically designed for marine solar power and comes with three 100W x 12V solar panels for a total power of 300 Watts.

Each panel has a monocrystalline solar cell that features a conversion efficiency of 21%. The sleek and lightweight design makes the panels highly portable. These solar panels are quite durable due to their sturdy aluminum frame. It is corrosion-resistant and can easily withstand 5400Pa of snow loads and 2400Pa of high winds. 

PWM Charge Controller

Another critical feature of this kit is the 30A flush mount PWM charge controller. It keeps the charging process safe and fast in all conditions by preventing short circuits and overload.

There is also an LCD screen that displays the system operating information. It helps you monitor the setting parameters all the time. Ideally designed for off-grid applications, this marine solar kit is suitable for RVs, boats, and even average-sized greenhouses. 

The Renogy 300 watt marine panel solar kit comes with an impressive 25-year warranty on the panels themselves.

Keep reading to learn more about the Renogy 300W marine panel solar kit. 

Pros and Cons


  • Superior aluminum frame to ensure durability
  • Impact-resistant glass
  • Backed by a 25-year warranty
  • Monocrystalline solar cell with 21% energy efficiency
  • The charge controller quickly charges the battery
    Installation is simple
  • The kit comes with a detailed manual guide
  • Multiple electronic protections against short circuit and overcharging
  • Lightweight and portable solar panels
  • Water-resistant and suitable for outdoor purposes


  • Not cheap
  • Batteries and some installation hardware needs to be purchased separately

Best Features

renogy 300w marine panels

In this section, we'll highlight the best features of this kit.  After this, we'll discuss some of the things we don't like.

Rigid 100W Solar Panels (3)

Renogy marine panel solar kit comes with three solar panels, each having a maximum power of 100 watts.

Each panel contains Monocrystalline solar cells with an efficiency of 21%. The panels are designed for harsh outdoor conditions and feature a sturdy aluminum frame that is resistant to salt water conditions.

PWM Charge Controller 

This package includes a high-quality Adventurer 30A PWM charge controller. It is a flush mount and effectively regulates the flow of current from solar panels to the batteries.  

We prefer more modern MPPT controllers for most solar applications today because they work far better with lithium ion and LiFePO4 batteries.  But for marine applications, lithium batteries are much less common so PWM works fine.

The charge controller is negative-grounded to ensure protection against reverse polarity, short circuits, and overload. 

This PWM charge controller is compatible with and capable of charging all types of batteries. It uses a 4-stage process to charge the batteries efficiently. This prevents the batteries from overcharging or over-discharging, and hence, the batteries remain in good working condition for longer.  

The 30A controller is generally enough for a 300W solar setup. However, if you are planning to extend the power capacity of solar panels in the future, you need to get a higher-rated controller to meet the requirements. It will be a more cost-effective decision in the long run. 

Ready to Install

Renogy marine solar kit comes with most of what you need to install it. All you need is to install the aluminum frames, locate and install the PWM charge controller, and make the right connections to connect it to your battery bank.

There are multiple hardware components such as a corner bracket mount, bolts, nuts, a solar adapter kit, two pairs of connectors, a tray cable, and one Renogy cable entry housing included in the package with a detailed manual guide to help with the installation. 

The installation process is straightforward. All you need is to follow the guidelines mentioned in the manual carefully.

Firstly, install the charge controller after making sure that solar panels and batteries are disconnected from the charge controller prior to mounting. 

Place the charge controller at a location that is near the battery with good airflow and protected from direct sunlight and water, and has enough room to run wires.

Mark four holes on the mounting surface and drill holes, and align them with mounting holes. Then, secure the charge controllers using the mounting screws.

Once the charge controller is installed, the next step is connecting the battery to the charge controller. Connect the negative and positive cables to the respective battery posts using a ring terminal.

You can use a fuse holder to make a safe in-line fuse. Connect the bare stranded part of the cable to the positive battery terminal on the charge controller and then insert the fuse into the fuse holder to power on the charge controller.

Attach the frame to the corner bracket mount using bracket bolts included in the package. Use a socket wrench to tighten them.

To attach the panel to the RV's or boat's surface, mark the holes for the well-nut insertion. Carefully drill holes at the marked locations and check if the well-nuts fit correctly. 

Align the brackets to well-nut holes and secure them in place using screws. Once all screws are properly tightened, it is recommended to check that all panels are well-secured before operating your boat. Cover the head screws with the sealant for extra assurance. 

30A of 12V power

The Renogy 300W marine panels solar kit produces a maximum of 300 watts of energy at a voltage of 12V. The 30A charge controller keeps the current flow in order to ensure quick and efficient charging of the batteries.

This solar setup, when properly installed, has the capacity to recharge a 200Ah battery, 2 x x100Ah batteries, or 4 x 50Ah batteries from 50% in four to six hours. 

The Renogy 300 watt marine panel solar kit can efficiently run some essential appliances like a small/medium fridge, yard lights, radio, laptop, big screen TV, and stereo with such power.

It is recommended to determine the total wattages of the appliances you want to power using the Renogy solar kit.


With an IP65 rating, this solar kit is ideally designed for marine applications. The kit with the junction box is water-resistant and can withstand extreme weather conditions.

It can endure 5400Pa of snow loads and 2400Pa high winds without compromising on the performance.  

So, you can easily take the Renogy 300 watt marine solar kit with you while enjoying some local waterbodies. This model does live up to its name by being highly resistant to water and a range of weather conditions.

Issues & Concerns

renogy 300w marine panels

While Renogy 300 marine panel solar kit is packed with advanced features, we do have a few issues and concerns about it.


This kit is considerably more expensive than other solar panel kits in the same power range. Most cost up to a third less - or you could go DIY and save even more.

Some components not included

The kit includes solar panels, a charge controller, and a tray cable. 

The assumption of course is that you will use this system to charge your existing lead acid or AGM batteries.  So batteries are not included.

In addition, some fasteners, additional length wiring and installation hardware that you may need for a more customized setup are not included in the package.

Alternatives to the Renogy 300W Marine Solar Kit

Renogy specializes in high-end products that live up to the expectations of customers. Each product features sturdy construction with a modern design.

Renogy is arguably the leader in marine solar kits in the 100W-500W range. They've been manufacturing quality products for many years. 

That said, newer brands including ACOPower and Pikasola offer similar-power kits that are worth a look. 

ACOPower 300W Solar Kit

ACOPOWER 300W Solar Kit

ACOPOWER 300W Solar Kit

The ACOPower 300W solar kit and Renogy's 300W solar kit are both ideal for marine applications and come with comparable parts, although in our opinion the ACOPower kit is a bit more complete. It also comes with a higher-quality MPPT charge controller. And its also less expensive. 

As far as warranties go, both the Renogy 300 watt marine panel solar kit and the ACOPower 300W solar kit come with a 25-year warranty on the panels and a 1-year warranty on the other parts.

Pikasola 400W Off-Grid Solar + Wind Turbine Kit

Pikola 400W solar plus wind power kit

Pikasola 400W solar plus wind power kit

Pikasola sells an interesting solar+wind turbine kit that's perfect for offshore marine applications, especially sailboats. 

Priced less than Renogy's 300W kit, Pikasola's off-grid system comes with two solar panels providing 200 watts of 12V solar power plus a wind turbine capable of producing another 400 watts in brisk wind, which really helps on cloudy and stormy days.  

Two different charge controllers are included, a PWM for solar and a separate charge controller for the wind turbine. Pikasola's power rating is 20A, however, whereas Renogy delivers 30A.

The Pikasola kit comes with a 1-year warranty and includes everything you need to install it.  

Care and Maintenance 

renogy 300w marine panels

Proper care and routine maintenance are vital to keeping the solar kit in good condition for a long time.

Here is what you should do to ensure that the kit works properly. 

  • Inspect the solar panels on a daily basis and make sure the surface is clean from dust and debris. A wet cloth or glass cleaner can be used to thoroughly clean the surface of solar panels when necessary.
  • It is crucial to ensure that all structural components are clean and corrosion-free. Regularly check the electrical connections and mechanical fasteners.
  • Check the battery electrolytes levels and maintain them according to the manufacturer's recommendations.
  • Use adequately insulated tools while making battery connections.
  • Check for damaged components and repair or replace them when required.


Renogy offers a reliable warranty of 25 years on power output to make it a valued purchase for customers. There is a 5-year warranty on solar panel material and workmanship.

The kit also comes with a 1-year material warranty on accessories, and it covers the repair and replacement of a defective part.

The warranty allows the customers to claim compensation if the kit suddenly stops working or there is an issue with the material during that period.





66 pounds


48 x 23 x 8 inches





Solar Panel Type:




Solar panel quantity:

3 (each 100W)

Maximum power capacity:

100 W

Maximum system voltage:

600V DC

Open circuit voltage:


Short circuit current: 


Optimum operating voltage:


Optimum operating current:




Output cables: 

10 AWG

Operating Module Temperature:

-40ºC to +80ºC

Where to Buy?

The Renogy 300W marine solar panel kit is the premium offering in the market. It provides enough daily power to keep your batteries charged and to run a variety of 12V appliances while keeping your electronics topped up.  Or, if you add an inverter you can power a small low-energy refrigerator or any other 100V appliance for up to a day.

You can learn more about the Renogy 300 watt marine solar kit by visiting the official product page.

If you want to buy the Renogy 300 watt marine panel solar kit, you can get it today from Amazon.  The Pikasola and ACOPower units are also sold on Amazon.

About the Author David Roberts

I'm a Mechanical Engineer who's obsessed with solar energy and sustainable living.

follow me on:

Let's Stay In Touch!

Subscribe now to receive more articles, offers and tips like this!

Leave a Comment: