How To Run A Hot Tub On Solar Power (Beginners Guide)

In terms of relaxation, a hot tub is unbeatable. Don’t worry if you’re trying to live a greener lifestyle but still want to relax in a hot tub. In that regard, a solar-powered hot tub is a real possibility when it comes to having cost-effective, reliable, and environmentally friendly hot tubs.

Usually, hot tubs have a mechanism where the water pump receives its water supply from the outside. The water’s temperature rises because the heater causes its molecules to vibrate and speed up. The question that arises here can I run a hot tub on solar power?

With 2000 watts of solar panels and a 24-volt 250Ah battery, you can power an average hot tub, despite its high energy use of 300 kWh.

Types of Hot Solar Tubs

Solar energy systems come in two primary varieties, both suitable for powering hot tubs.

Solar Panels

You should connect your hot tub to solar panels since they are the most efficient. The energy from the solar panels may be stored in batteries, allowing you to enjoy your solar-powered hot tub whenever possible.

This option is more costly and requires the expertise of a solar panel installation. Still, it has the potential to provide a higher return on investment (ROI) over time and ensure that your hot tub always has electricity, even after there is no sunshine.

Heat Exchanging Panel

When compared to the above alternative, this one is far more affordable. Simply put, a heat exchanging panel is a solar-powered panel with a network of tiny tubes linked to it that may be plugged into your home’s water supply. The hot tub’s cold water is pumped to a heat exchange panel, which is heated via a series of tubes.

If you need to heat your tub quickly, you may use this panel in addition to your regular electrical heating system, and it will keep pumping hot water as long as the sun shines.

One major drawback of this approach is that heat-exchanging panels cannot be used to store energy. It has a short lifespan, serving as a temporary solution throughout the day. They are also quite large systems, so you’ll need to clear up a sizable section of your yard to accommodate them.

Last but not least, regulating the temperature of the water is problematic. If you want to go swimming, you should check the water quality often.

What is the Best Choice for a Solar Hot Tub Heater? (Electric PV VS Hot Water) (This part is not clear, if you can rewrite it to be better, or completely remove it)


Electricity is produced by solar PV, whereas solar thermal is just used to heat water or air. This opens up a viable secondary revenue stream for solar PV owners by selling surplus power back to the grid.

In one sense, solar power systems (Electric PV) may be set up rapidly and with minimal effort. However, its efficiency is low; on average, it converts just 20% of the sun’s energy into usable electricity.

It makes sense to utilize electric solar panels to power a hot tub if an electric element is heating the water, and solar thermal energy may be used in place of electricity in some cases.

Solar thermal systems are more efficient when converting solar energy into heat (up to 75% of solar energy is converted) but are also more challenging to install.

4 Possible Ways to Run A Hot Tub On a Solar Power

Here are some ways to DIY a hot tub on solar power.

1. Heating Hot Tub With Solar Power

You must take a few steps to switch your hot tub to solar electricity. The right solar panels must be selected first.  

After making your panel selection, the next step is to arrange for installation. Due to the potential for damage or even fire, this is usually a job best left to a professional.

Once the solar panels have been installed, they must be connected to the hot tub through wiring. This is a straightforward procedure, but you must ensure that all pieces fit together securely.

After the installation and setup are complete, you may relax in your solar-powered hot tub without further costs or hassles.

2. Find Solar Compatible Hot Tub

While most people focus on the tub’s dimensions and design, the tub’s energy source is just as crucial. Many hot tubs are available, and not all are compatible with solar energy systems.

It’s essential to check with an expert if you have doubts about your hot tub’s compatibility.

3. Energy Storage Batteries For Hot Tubs

Solar panels and energy storage batteries are excellent options for powering a hot tub using only the sun. That way, you may heat your hot tub at night using the energy you stored throughout the day.

It is crucial to pick the best energy storage battery for your needs from among the numerous available on the market today. It’s essential to get the batteries installed as soon as you choose.

4. Leisure Solar Batteries

In a solar-powered hot tub, employing recreational batteries has several advantages. Leisure batteries can store energy throughout the day because of their extended usage time.

In addition, leisure batteries usually are far less expensive than other types of batteries available. Finally, installing leisure batteries is so simple that you can do them yourself without risking any damage to your hot tub.

How to Install A Solar Hot Tub

Source: Youtube

Step 1: Find A Location For Your Hot Tub:

The first step should be considering a suitable location and method for mounting the solar panels. You may put them flat on the ground if the sun shines directly on them all day. The fence is another great place to display them. It’s recommended that you pick a location that faces south and receives at least six hours of sunlight daily.

Step 2: Connect Preferred Solar Heating Components (2 Ways)

Install solar panels or purchase a hot tub kit with solar heat exchangers. Let’s talk about the two approaches.

  1. Install A Solar Hot Tub Kit: Install the parts for your solar hot tub according to the manual you received with the kit. Once the light tube collectors are installed, the plumbing can be put together.
  2. Install Solar Panels: Prepare all the necessary solar equipment. Place the panels where they will get the most sunshine. Attach the battery to the charge controller, and then hook up the controller to the solar panels. Join the inverter to the charging controller. If the solar panels were correctly fitted and the inverter was turned on, the batteries would begin to charge.

How To Convert Hot Tub From Electric To Solar

Don’t worry if your hot tub runs on electricity. If you want a more environmentally friendly hot tub, you don’t have to throw away the whole thing because switching your hot tub from electric to solar power is simple.

If you need help with any of the steps described, it may be best to see an expert.

  1. Change the position of your Tub: To get started with the conversion, you’ll need to relocate your hot tub to a spot where it can soak up as much sunshine as possible. Drain the water from the tub before attempting to move it.
  2. Heat the Tub: If you set your tub correctly and cover it with a translucent material, the sun’s rays will warm the water naturally.
  3. Connect the Power: If you heat your hot tub during the day, you may need a modest heater to maintain the desired temperature at night. Calculating the heater’s power consumption can determine how many solar panels you’ll need to keep your hot tub warm.
  4. Estimate the Energy and Money Consumption: If you want to use a solar water heater for your hot tub, you should research how much power it will require. Depending on your state, there will be a roughly 11-cent increase in the cost per kilowatt-hour of energy. Therefore, the power consumption of a hot tub operating at 240 volts is around 7,500 watts.

Solar Hot Tub Installation (Tips And Warnings)

Solar panels and solar heat exchanger kits are simple to set up. However, remember the following reminders to get the most out of your hot tub.

What matters most is where something is located. For solar panels, this is of utmost importance. Allow the sun to do its thing if it shines most of the time where you live. However, the solar panels must be tilted at an inclination of 30 to 45 degrees for most homeowners. Face the solar collectors due south. Five to six hours of sunshine per day are required at the location.

The use of a solar controller is recommended. Thermostat functionality for your hot tub may be achieved using a solar controller, temperature sensors, and a control valve. The system may switch solar power off when it’s raining or dark.

How Much is Solar Power Sufficient For Running A Hot Tub?

Source: sierrasolar

We’ll size the solar panels such that your solar-powered hot tub can produce at least 300-kilowatt hours of electricity each month.
Solar systems, like all electrical and mechanical systems, experience losses; to account for this, I often add up to 50% additional capacity. It takes into consideration the potential of cloudy or otherwise low-sun days.

How Many Solar Panels Are Required To Power Your Hot Tub?

If we have Two-kilowatt electric hot tub heater and a 10-hour warm-up period from room temperature to 100 degrees Fahrenheit, we have 10 hrs x 2 kW = 20kWhours.

Energy used/day to maintain temperature: 2kW x 3 hours = 6kWh or 6000 watt-hours

By calculating the amount of energy needed and dividing it by the number of peak sun hours each day, we obtain 1410 watts of solar power or five 300-watt solar panels.

Can Solar Power A Hot Tub All Year Across?

To put it simply, yes. All season long, a hot tub may be heated using solar energy. However, keep in mind that the efficiency of your solar panels will be affected by the quantity of sunshine available. During the colder months, when there is less sunshine, it may be necessary to use a backup power source in addition to your solar panels.

Advantages Of A Solar Hot Tub

  1. Cheap: Using solar energy to heat a hot tub is more cost-effective than gas or electricity. Spending money on solar panels upfront is an investment that will eventually pay for itself.
  2. Lots of free hot water: You can get a lot of free hot water from this if you live in a warm enough region. As long as the sun is shining, it will keep producing hot water indefinitely.
  3. Reduce Carbon Footprint: To the extent that you can heat your hot tub using solar energy, you can contribute to reducing carbon footprint thus and global warming pollution.
  4. Easy To Install: As solar panels are simple to DIY it, you may power your hot tub with the sun without risking any damage to the hot tub.
  5. Less Maintenance: Very little upkeep is required once this system is up and operating. There are no mechanics or moving components. Therefore nothing can break.
  6. Reliable: You can rely on solar energy to heat your hot tub when needed since it is a reliable and consistent energy source.


Now that you’ve many options for designing a solar-powered hot tub.  Ultimately, you are the only one who can decide which system is best for your needs.

Whether or not a solar heating system for your hot tub is the best option depends entirely on how often you use your hot tub, how much solar heat is available where you live, and your commitment to sustainability.

Now that you know how to use solar energy to power your hot tub, you can go out and soak away the stress of the entire day by purchasing and using a solar hot tub!


Can I Need Batteries For Solar Powered Hot Tub?

Yes, we need batteries for the solar-powered hot tubs. In such a case, I suggest going with the 250Ah 24-volt batteries. Battery power allows us to use the energy we produce over a day when we need it instead of waiting until we need it.

How Does A Solar Hot Tub Work During Winters?

Solar vacuum tubes have grown more efficient. Therefore, they are now often used to heat hot tubs. A solar hot tub collects heat from the sun during the day. To use solar energy to heat your hot tub in the winter, you’ll need a system that consists of heat pipe collectors filled with an antifreeze mixture and a heat exchanger that connects to the tub’s plumbing.

How Much Money Can You Save With A Solar Hot Tub?

It is estimated that homeowners that switch to solar energy can reduce their energy costs by as much as 70 percent. In that regard, solar-powered hot tubs are a viable option.

Ahmad Ghayad

Ahmad Ghayad is the Creator of, a website created to help people build and understand how solar power systems work. He is a passionate Mechanical Engineer that worked in the building and maintaining several solar power systems for houses and organizations during a severe domestic power outage in his country.