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2.5-Watt Solar Battery Charger

2.5-Watt Solar Battery Charger

Item # PTW2997
Our Price: $46.47
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Performance Tool Battery Charger - PTW2997

  • RV/Camper
  • Trailer
  • Battery Charger
  • 12V
  • Performance Tool
  • Solar Panels to Auxiliary Battery
  • Charges Only


  • 2.5-Watt solar panel for all your 12 volt battery charging and maintaining needs
  • Amorphous solar panels operate in all daylight conditions, even cloudy days
  • 12-Volt DC plug and alligator battery clamps included
  • Durable ABS plastic housing with mounting holes
  • Includes 4 suction cups for easy mounting to the windshield
  • 9' Total cord length
  • 1' From connector to adapter plug and 8' from adapter plug to solar panel

W2997 Performance Tool 2.5-Watt Solar Battery Charger

W2997 2.5-Watt Solar Battery Charger

Installation Details PTW2997 Installation instructions

California residents: click here

Video of 2.5-Watt Solar Battery Charger

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Performance Tool 12V Solar Battery Charger Review

What's going on everybody. Adam here with "etrailer". Today we're going to be taking a look at the Performance Tool, Solar Battery Charger. So I was tired of carrying this battery all the way up to the house to charge it. So basically what we did is put the Solar Battery Charger on there. So we don't have to do that anymore.

And we don't have to worry about getting stranded out in the middle of the lake. So this is going to be super useful for you guys that have boats, but also for your trailer stuff. You know, if you have a decent amount of appliances and stuff inside some of your trailers, it's nice to kind of keep the batteries that are supplying that power for those different things juiced up. So this way it's basically free energy. You know, you spend the money and time to install it once and let the sun do the rest of the work.

I just think solar is a no brainer. And for my instance, it's just going to save me so much time and hassle just so I can get on the boat and go fishing without having to charge this thing up. Basically, all you gotta do is find a place to put it. That's step one. Once you figure that out, we have about nine foot of cable, that'll go all the way around and then you can either use these alligator clamps.

I really like them just because they're shaped pretty nicely for the studs on our battery, but also just picking out the spot is really, really important. But basically once it gets going there's a little LED at the bottom that's going to light up blue. Since this is so easy to install, you can do it a couple of different ways. We basically just took self-tappers, but something that we didn't use in the kit are just these little suction cups. So if you don't want to permanently install it, you can just take it out and you can put it on the dash of your car.

Another thing we're not using that comes with the kit is this. So all you gotta do is just plug this into your 12 volt port in your car and connect it to the solar panel, throw it on your dash and it'll charge the car. So this doesn't really have to be hard mounted, but we're just keeping it on the boat just to prevent me from having to take this battery up there. But you have those options, which I think is pretty cool. So we've never really had an issue of using a full battery and running it completely dead when we're out on the lake. It's not that big of a lake. So we don't use a whole lot of juice. This panel is going to give us about 2.5 Watts of power going to our battery, which isn't a whole lot, but it's going to be sitting out here all day when I'm at work and it's just going to be working for me the whole entire time at work. So it's going to be ready by the time I get down here. So not a whole lot of juice that goes to it, but that's not really a big deal when it comes to solar panels. I just want to make sure it maintains the charge on the battery. So we don't get stranded and have to bring it up and charge it all the time. I think this is a no brainer and it's super easy to install. So if you stick around, we're going to show you the very, very few steps you need to take to get this thing, pumping juice to your battery. A really important piece when it comes to the solar panels is placement. So I'm doing on a boat today, but a lot of you guys are just putting it all on your trailers, whether it's on a little toolbox in the front, on your A-frame or just wherever else you put it on your enclosed trailer. Sometimes people just put it kind of in the front, but with the boat, what I think is best for our situation. We really don't use more than one troll motor of course, and nothing else really mounts on here. So I think a good way to do it since the cable kind of offsets to one side when I have it kind of like this, and I'm just going to self-tap it to the little ridge of the boat. It doesn't come with mounting hardware. So you just got to sort of set yourself. And we don't really have to keep it this close to the battery because we have about eight foot of cable on this end and about foot where it connects to our battery. So you don't have to put it that close, but it just kind of works out in this case. So pretty much we're just gonna go ahead and take our self-tappers, get it lined up where it's nice and center and screw this in. We don't do it too tight. Cause it does have an ABS plastic housing, which is pretty strong. But if you put anything under a certain amount of stress it'll eventually crack. So just be mindful that we don't want to damage the panel. Solid. So now that I connected these, it seems to be pretty watertight, not a hundred percent. So if you're going to keep this on here for a while, maybe throw some tape or something around it but of course, we're going to end up putting a little topper on our battery. I think what I'm going to do is not really undo most of this cable. We can kind of pull it apart and basically just hook it up just like a jumper box or whatever. I do like how rounded these clamps are. So it really gets a lot of surface contact with it. So we can go ahead and do something like that. Kind of fold them in a little bit. Just so the top of our battery cover can fit. If you're wanting to charge your battery with a solar panel, this is probably the simplest setup I've ever done. So I would definitely recommend it if you just want to get something in there quick and get your battery just charged up without you having to be there. And that's pretty much it for our look at the Performance Tools, Solar Battery Charger,.

Customer Satisfaction Score:

Customer Reviews

2.5-Watt Solar Battery Charger - PTW2997

Average Customer Rating:  4.4 out of 5 stars   (105 Customer Reviews)


Exactly what I wanted, and exactly as advertised!It is charging my trailer break-away battery with the solar panel in the shop window!

Still working fine. Im amazed how little sun light it needs to work.
Eric - 08/11/2022


I ordered the panel because I wanted it to charge the battery on my trailer just like your video. Did the same set up as you guys did and it works like it should. The only thing I did different is I put little rubber pads between the panel and tool box so water doesnt get in the box. Its maintaining the battery at 12.6. If I have a problem with it I'll write another review but good so far.


They are great, I use them to keep my hearses battery charged up when they sit outside. Work perfect, also my lawn mower.

They work great, have installed on all my stored cars
Dale S - 05/22/2022


Complete waste of money!
Bought it for
my dump trailer to maintain battery between long runs in between use, mounted it to battery box, ran wires cleanly and it seems to work fine, light blinking acknowledging it’s getting the solar rays it needs to charge until you plug it to the battery and then nothing. Light goes off. Tried it with the alligator clips and or wired straight with plug, same result. Thought maybe it was charging anyways without light blinking so I let it sit to charge the battery that was only used to dump once and nope, still no charging going on.
Save your money!
Would not recommend this unit.


My winch is mounted on a pedestal welded to the tongue of an open trailer. I power the winch with a 12v marine battery mounted in a watertight box and a small solar charger. The winch pulls a 3000-pound car onto a trailer with ease.


It kept the boat battery charged till I started the boat without disconnecting the charger, then it stopped working, that was my fault. I bought 4 more and one of them didn't work, put out about .3 volts.

It is important to disconnect the solar battery charger from automotive 12 V receptacle or battery terminal before starting the engine because surges of electricity from the engine may damage the solar panel.
-- Etrailer Expert Sierra K - 11/29/2021


I had it connected to a bumper hitch 14' dump trailer that uses a 12V battery to power the hydraulics to raise and lower the dump bed. Usually plug an extension cord into the side of the battery box as it has a built in charger to charge the battery fully or use a battery charger. Since we get plenty of sunshine thought this would be a good accessory to keep the battery charged while not in use, but after having it connected to the battery for 10 days it did not charge the battery up. The blue light on the unit was blinking and I used a voltmeter to make sure the unit was putting out correct voltage and it was. Moved the unit to a battery on my lawn tractor to see if it would charge it up, same results, would not charge the battery. Will try it next on my deer feeders to see if it will charge the smaller 12v batteries as my smaller solar chargers do.

Would not recommend this product.

This solar charger is great for maintaining a battery when your trailer is being stored long term. It essentially provides a trickle charge to keep your battery from dying while it is not being used. To provide the battery with a small charge during shorter storage, I recommend a charger like the Go Power Eco Solar Charging System # 34273836
Go Power Eco Solar Charging System - 10 Watt Solar Panel
. This Go Power kit has a 10 Watt panel to provide more power to your batter than the PT 2.5 Watt panel. The 10 Watt panel will still provide low enough power that you wont have to be worried about over-charging your battery.
-- Etrailer Expert Victoria B - 01/06/2020


Solar battery charger work very well very easy to hook up thank you E trailer

Great It kept my boat battery charged all winter
Bruce - 06/25/2021


First and foremost etrailer rocks. Excellent experience as always. The solar panel I am not happy with. I keep the panel zip tied in my dump trailer, I am assuming that I will be replacing this every year or so from damage. I assumed it had a standard two prong 12v disconnect. I bought a quick connect that attaches to the studs of the battery... it doesn't work! etrailer customer support confirmed it. Keeping the alligator clamps on all the time worries me, that they will bounce off.

The charger didn’t make is past 10 months, and completely died. It was mounted on a dump trailer and stayed out in the elements. While there was no impact damage, some heavy rains totaled it. They aren’t really weather resistant....
Frank - 12/22/2020


Received the wrong item. I received what looks like a hub cap for trailer, instead of solar battery charger, order #[XXXXXXXXX]. The hub cap has ups tracking #[XXXXXXXXXXXXXXXXXX]. I would prefer the 2.5 watt solar battery charger. Thank you

Thank you for letting us know! Our customer service team should be reaching out to you in the near future.
-- Etrailer Expert Brooke M - 10/20/2021


I have them on my pontoon and they keep the batteries ready to go.


Great item for the price. We use these on our dump and lift trailers that have an onboard battery to power the pumps and winches. Sometimes the trucks don't always keep the batteries charged, this charges it all day while the sun is shining. Just need to make sure it's in a secure place, as they can get damaged fairly easily.


I purchased this charger to maintain my lawnmower battery. I had been using a plug in type charger and thought this would be more convenient. The integrated charging light and my multi meter showed voltage, but it did not do what I needed.

To be completely fair, the location was partially shaded daily depending on sun location. If you purchase this unit plan on full sun all day long.


This was to replace the same one be that was broken during a jackknife turn that damage the box and broke the solar charger. Works great always kept my battery topped off during the lulls of storage. HIGHLY recommend this product


It charges well once you flip the wires if you already have a previous battery charger lead on your battery. I had to call to find out why it wasn’t charging.


I have been using these charges for just over a year. One is on a mini excavator, and the other is on a marine battery for an outboard motor. As far as I can tell, they are working great.


I purchased two of these chargers, one for my camper and one for an old vehicle, both kept in an RV lot when not used. I used to remove the batteries and bring them home to keep them charged during the winter months. I don’t have to do that now. The chargers work perfectly for my situation. Would certainly recommend them.


It does exactly what it is suppose to d o.


Used to keep the battery charged on my back-up generator. Works well for that application.


It quit working after approximately 6 months. Until then it kept the battery on my dump trailer in good shape.


I am extremely pleased with this item. Wish I had one many years ago. It keeps my battery topped up in my vehicle I hardly ever drive and it's a diesel and it fires right up now.


Those solar as you call them "battery" chargers do not have enough regeneration to charge a 12 volt battery. I chucked them, or to say, threw them in to the garbage can. I will never order such a product again without proper research and proven testimony.


The original solar panel was damaged during a log loading day. This is a replacement thanks of the operation of the previous solar panel.


If you have a battery on your trailer to run your hydraulics, this is a MUST HAVE! The slow trickle charge keeps the battery up and ready when I need it. I attached it using some 3M double sided tape, and hooked it to my battery and have forgotten about it.


This did not keep my battery charged and I stopped using it because my battery kept dying.

Thank you for your review! I linked an expert answer that I thought you might find useful. Basically, you might have something else that is draining your battery even when everything is turned off. I hope this helps!
-- Etrailer Expert Brooke M - 08/09/2021

Show More Reviews

See what our Experts say about this Performance Tool Battery Charger

  • Could 2.5-Watt Solar Battery Charger Charge 6 Volt Generator Batteries
    If the 6 volt generator batteries are wired in series which doubles the output voltage to 12 volts then yes the # PTW2997 can be used with it. If the output voltage is only 6 volts then this would not work well since the voltage would be too high. Most likely this will work as I'd be surprised if your generator had a 6 volt battery/starter circuit. You'd connect this to the battery bank like the in series wiring of the generator battery.
    view full answer...
  • Performance Tools 2.5 Watt Solar Charger Blue Light is Blinking Yellow
    I was able to reach out to my contact at Wilmar who mentioned a couple of different things that could be going on with your 2.5 Watt Solar Battery Charger # PTW2997. First, they mentioned that you should always use the battery end that came with the solar charger, so if you've not connected the solar panel with the cord that it came with, this is the most likely culprit. If that's not the case, they also mentioned to look at the following things: - make sure that the battery it is being...
    view full answer...
  • Would 2.5-Watt Solar Battery Charger # PTW2997 Drain Battery if Not In Sunlight
    The 2.5-Watt Solar Battery Charger # PTW2997 that you referenced would not backfeed or drain the battery it's connected to when not charging it. It does not draw anything when just connected and not in sunlight so you wouldn't have to worry about it draining your battery if left installed. It'll just charge it when it has sunlight and leave it unaffected when not in sunlight.
    view full answer...
  • Could 2.5-Watt Solar Battery Charger # PTW2997 Over Charge a Battery
    While the 2.5-Watt Solar Battery Charger # PTW2997 doesn't have an overcharge protection feature it won't over charge the battery as it doesn't put out a high enough voltage charge that would damage the battery once topped off. So what that means is that you can leave it installed on a battery without having to worry about it causing damage.
    view full answer...
  • Solar Panel Charger that Could be Used to Charge Stored RV Battery
    If your batteries are all wired together in parallel you could use the Solar Panel charger part # PTW2997 which can give up to a 2.5 watt charge in sunlight. It wouldn't do much but it would keep a charged battery topped off if you had sunlight.
    view full answer...
  • Will the 2.5-Watt Solar Battery Charger Part # PTW2997 Overcharge a Battery
    I spoke to my contact at Performance Tool (PT) and they informed me that you should have no concerns with the 2.5-Watt Solar Battery Charger part # PTW2997 overcharging your trailer battery. The battery charger has a built-in mechanism that prevents the unit from overcharging.
    view full answer...
  • Can Performance Tool Solar Battery Charger # PTW2997 Overcharge Breakaway Battery
    I spoke with my contact at Performance Tool regarding the Solar Battery Charger # PTW2997 and he said that this unit does actually have a built-in control that will shut the charger down once the battery is completely charged. He said there is no risk of overcharging when it's left hooked up for a longer period of time such as when the trailer is in storage. He did say that this is a really great solution for maintaining the charge on a smaller breakaway battery. I have attached a short...
    view full answer...
  • Solar Charging Smaller 12 Volt Batteries Like Lawn Mower and ATV
    The 2.5-Watt Solar Battery Charger # PTW2997 delivers 2.5 watts but has a maximum charging amperage that is so low it will not overcharge your battery or shorten the life of the battery but rather will give it a slow charge similar to a trickle charger.
    view full answer...
  • How to Connect Two Batteries to a 12V Battery Charger or Solar Charger
    With two batteries on your RV, to charge the battery bank using an external charger like the 2.5-Watt Solar Battery Charger # PTW2997 you will connect the positive side of the charger to the first battery's positive terminal and the negative side of the charger to the second battery's negative terminal. It doesn't matter if the batteries are connected to each other in series of parallel for this to be the correct connection. With this charger you will either have two 12V batteries in...
    view full answer...
    Image 1 for
  • Could Solar Battery Charger # PTW2997 Overcharge Battery
    The Solar Battery Charger # PTW2997 doesn't have an overcharge protection feature, but by design it won't over charge the battery as it doesn't put out a high enough voltage charge that would damage the battery once topped off.
    view full answer...
  • Can the Performance Tools Solar Charger be Used While the Vehicle is Connected to the Trailer.
    Yes the Performance Tools 2.5-Watt Solar Battery Charger part # PTW2997 can be installed while the trailer is connected to your tow vehicle. We have had zero issues with this causing any kind of issues on the trailers we have it installed on for the same application.
    view full answer...
  • Adding a Solar Panel to Charge a Trailer Breakaway Battery
    Part # PTW2997 works great for charging your breakaway battery when the trailer is not in use. This product is easy to hook up and fairly inexpensive compared to the price of a new battery. I strongly recommend this product. We do not carry any breakaway kits that include a solar panel but adding this unit will keep your battery charged on the trailer while it is being stored. When you are going to tow, you can unhook the unit from the battery and it will be good to go while towing.
    view full answer...
  • 2-1/2 Watt Solar Battery Charger Compatibility with 12v Battery
    As long as the battery you have in storage can still hold a charge, you can use the 2.5-Watt Solar Battery Charger # PTW2997. A larger solar panel system could charge the battery faster, but it is not required to charge and maintain your battery power. This solar charger can be used for all types of 12v batteries like ones used for cars, boats, motorcycles, PWC and lawn tractors.
    view full answer...
  • Could 2.5-Watt Solar Battery Charger # PTW2997 Be Used On Boat Battery
    Yes you definitely could mount the 2.5-Watt Solar Battery Charger # PTW2997 on your boat to keep the accessories you mentioned's battery topped off.
    view full answer...
  • Is a Charge Regulator Needed for the 2.5-Watt Solar Battery Charger
    I have spoken with Performance Tool in the past and they have stated that the 2.5-Watt Solar Battery Charger part # PTW2997 does not require any sort of charge regulator so you will be fine to leave it plugged in.
    view full answer...
  • Could 2.5-Watt Solar Battery Charger # PTW2997 Charge a Dead Battery
    The 2.5-Watt Solar Battery Charger # PTW2997 does not have ability to charge a totally dead battery. It really only could be used to keep a battery topped off. A 2.5 watt charge would not be enough to put a solid charge on really anything.
    view full answer...
  • Does 12 Volt Adapter of 2.5-Watt Solar Battery Charger Work Inside the Vehicle
    Yes, you are exactly right; the 12 volt adapter that comes with the 2.5-Watt Solar Battery Charger # PTW2997 will be able to maintain a trickle charge to your vehicle battery by plugging that adapter into your 12 volt accessory/cigarette lighter inside your vehicle. The charger also comes with suction cups so you can mount it to your windshield just for this purpose. You can see this explained if you go to about the 2:55 mark of the linked video review of the 2.5-Watt Solar Battery Charger...
    view full answer...
  • Can 2.5-Watt Solar Battery Charger Item # PTW2997 be Used on Smaller Motorcycle Batteries
    Yes, the 2.5-Watt Solar Battery Charger # PTW2997 could be used to help charge a smaller motorcycle/snowmobile battery. In the instructions for this (attached link on page) it specifically mentions that this type of battery is compatible. It doesn't have an overcharge protection feature, but by design it won't over charge the battery as it doesn't put out a high enough voltage charge that would damage the battery once topped off. I attached a review video for more info on this as well.
    view full answer...
  • Solar Panel Charge Kit Recommendation for Two 6-Volt Batteries Wired In Series on Trailer
    We have a great kit for exactly what you are looking for. The 2.5-Watt Solar Battery Charger # PTW2997 will put a solar 12-volt maintenance charge on your trailer batteries while they are in storage. This kit was basically intended for your exact setup as most install it on the front of the trailer and then route it to the battery box like in the picture I attached. As long as your batteries are wired in series which means their output is 12 volt and you have this attached in series as...
    view full answer...
    Image 1 for
  • Will Performance Tool Solar Battery Charger # PTW2997 Overcharge Battery
    I have actually spoken to my contact at Performance Tool before about the possibly of overcharging with the Solar Battery Charger # PTW2997. He said that this unit does feature a built-in control that will shut the charger down when the battery is completely charged. There is no risk of overcharging the battery even if you were to use this for a longer-term application such as when the camper is in storage. I have attached a short video demonstration on this charger that you can check...
    view full answer...
  • How to Check if the 2.5-Watt Solar Battery Charger is Working
    The 2.5-Watt Solar Battery Charger # PTW2997 that you referenced will have 2.5 watts of power for output, but that is under the right circumstances. If you are in a heavily shaded area then that would affect the output compared to if you were out in the middle of an open field. The blue light will only blink when it is absorbing light, so if you have it exposed to direct sunlight and the blue light is not blinking then the solar panel is most likely damaged.
    view full answer...
  • Compatibility of the 2.5-Watt Solar Battery Charger Part # PTW2997
    I have attached a photo of what the connector on the end of the 2.5-Watt Solar Battery Charger part # PTW2997 looks like. You will need to compare the plug on your RV to the photo in order to determine capability. The charger also comes with a set of alligator clamps which could be used or removed and hardwired in if the connectors do not match. I have attached a review video on the above charger for you as well.
    view full answer...
    Image 1 for
  • How To Keep a Breakaway Battery Charged While In Storage
    In order to keep the battery on a breakaway system charged while in storage you have two options. The best option for you is going to be based on what resources you have available. If the trailer is stored outdoor then you can use the 2.5-Watt Solar Battery Charger part # PTW2997. If you don't have access to power and the trailer is stored indoor then you will want to remove the battery from the trailer and then take this home with you so it can be hooked up to a battery charger where power...
    view full answer...
  • Can 2.5 Watt Solar Battery Charger PTW2997 Be Mounted Flat To Trailer Or Does It Need To Be Tilted?
    The 2.5-Watt Solar Battery Charger # PTW2997 you were looking at is waterproof so getting water on it should not cause issues. There is not a problem with mounting the charger flat as we have chosen to mount it in this manner as you can see in the included video.
    view full answer...

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