Best Jet Ski Solar Battery Charger [Maintain Battery]

I’m a huge fan of solar battery chargers for jet skis, out of necessity, after seeing so many customers having trouble maintaining their batteries.

Like clock work, customers were coming in every year at the start of the season with dead batteries.

Some customers tried to solve this problem with battery switches, but it was never perfect and didn’t solve the heart of the problem. The solution is simple, a 5-watt or less solar battery charger is what they needed and is what I use to keep my batteries going strong for years.

This brings up a new question, what is the best solar battery charger and which one should you use?

The Best Solar Battery Charger

The best solar charger will be one that is 12-volt and under 5-watt, along with it being weatherproof.

Here are my top picks:

  1. ECO-WORTHY 12 Volt 5 Watt Solar Trickle (Amazon Link Ad)
  2. Sunway Solar Car Battery Trickle (Amazon Link Ad)
  3. SUNAPEX 12V Solar trickle (Amazon Link Ad)

Using these chargers and quick connections is the best way to keep your battery charged and ready to go!

How To Maintain Your Battery

Taking cover off to show solar panel charging setup

The biggest reason you want to use a solar charger is because it works the best to maintain your battery.

Jetskis use a lead acid battery and if it’s not used for months it will lose its charge and die. This is why so many customers have to buy a new battery every year, as they don’t ride them in the off-season.

A solar battery charger, especially 5-watt and under, doesn't necessarily charge the battery, but instead helps maintain and keep the battery alive. The slight charge is just enough to keep the battery active and going strong for years.

We only want to keep the battery active and alive, we don’t need to charge it. The solar panel can charge the battery if given enough time, but it’s the maintaining of the charge that we want.

Solar Vs. Wall

1 amp battery charger on work bench

The reason why you want to use a solar battery charger over a regular charger you plug into a wall outlet is for 3 reasons.

  1. No need for a power outlet; not every dock has power.
  2. Don’t output a lot of power, so the worry of electrical shock is much less compared to wall outlets.
  3. Simpler design, most don’t even have or need a circuit board.

Overall, it’s just better. They are stored outside and kept in the sunlight anyway, so might as well keep a solar charger on it.

Battery Switch?

Boat battery switch next to big 24 size battery

Before solar battery chargers, I had customers who insisted on having a battery switch. Most boats have battery switches, and this is where many of them got the idea to help keep their batteries alive during the off-season.

After installing a few battery switches, I learned it’s not helpful and often caused future problems.

The battery switch was also not solving the heart of the problem, as the customer would have the battery off, but still come to a dead battery at the start of the season.

The problem is not that the PWC uses a little bit of power when off, but the battery was going flat because it was not being used.

The reason battery switches don’t work for PWCs is that the battery is much smaller than a boat’s. Smaller lead acid batteries sulfate faster, and that is why they don’t do as well as the larger boat batteries.

Instead of doing another battery switch for a customer, I suggested he use a solar battery charger. Not only was the solar charger cheaper to install, but it would work way better for his needs because he kept the machine outside on his slip. To this day, the first thing he tells me every time we meet is how great that solar charger has been for him.

I, personally, use a solar charger for my Spark and get at least 5 years out of a battery. Batteries do wear out, but to get more than a year out of one you’re going to want to use a solar charger.

5-Watt Max

The reason you want to stay at or under 5-watt is because we’re not wanting to charge the battery, but instead maintain them.

When you start to go over 5-watts you need a solar charge regulator that will turn on and off as the battery needs it. A too powerful of a solar panel and you could cook the battery, that is why the regulator is needed.

If you stay at 5-watts or less, you never produce enough power to worry about. I often recommend getting a 1.5-watt solar battery charger as it’s a good sweet spot, but 5-watts is good if the solar panel is in a shady spot.

Direct Sunlight NOT Needed

The solar panel doesn’t need to be in direct sunlight all day, but you want the sun to shine on it for at least 2 hours a day.

Even on cloudy days, the solar panel can pick up enough charge to make it worth it.

Again, we’re not wanting to charge the battery, but instead maintain it. So not much power is needed, just a little bit of sun is enough to keep the battery active and happy. Going days without getting sun is fine too, it’s when the battery goes months without being used that it becomes a problem.



I started working at a power sports dealership in 2007, I worked in parts, service counter, and as a technician before moving to sales in 2013. I created in 2014 to answer common watercraft questions I would get from people. Now managing the site full-time, I continue to provide advice and web tools for my readers about watercraft. I've owned several watercraft, with a Sea-Doo Spark as my current main PWC.

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