--- product_id: 10376376 title: "ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries" brand: "allpowers" price: "¥376" currency: JPY in_stock: false reviews_count: 13 url: https://www.desertcart.jp/products/10376376-allpowers-18v-12v-5w-portable-solar-panel-car-boat-power store_origin: JP region: Japan --- # 12V battery support 5W solar power Weatherproof design ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries **Brand:** allpowers **Price:** ¥376 **Availability:** ❌ Out of Stock ## Summary > ☀️ Power Up Anywhere with Solar Magic! ## Quick Answers - **What is this?** ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries by allpowers - **How much does it cost?** ¥376 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/10376376-allpowers-18v-12v-5w-portable-solar-panel-car-boat-power) ## Best For - allpowers enthusiasts ## Why This Product - Trusted allpowers brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Harness the Sun:** Charge your batteries with 5W of solar energy, no outlet needed! - • **Smart Technology:** Built-in blocking diode prevents reverse discharge, extending battery life. - • **Durable & Reliable:** Weatherproof design ensures performance in all daylight conditions. - • **Portable Powerhouse:** Lightweight and easy to transport for on-the-go charging. - • **Universal Compatibility:** Perfect for cars, boats, motorcycles, and more. ## Overview The ALLPOWERS 18V 12V 5W Portable Solar Panel is a versatile and efficient battery charger maintainer designed for automotive, motorcycle, tractor, and boat batteries. With a lightweight design and weatherproof capabilities, it harnesses solar energy to provide 5 watts of power, ensuring your batteries stay charged and ready for action. The built-in blocking diode enhances battery longevity, making it a smart choice for eco-conscious users. ## Description Review: Does the job, so far! Read this, so you know what you're getting. - I was a bit skeptical of these after reading so other reviews, so I did a bit of testing. Hopefully my results will be helpful. My situation is that I am retired, have 2 vehicles and don't have a need to drive much. But it seemed like every time the weather turned bad, the 4WDs battery was dead, and every time it turned nice the rag-top was dead. Not only a pain to drag out a charger, but it's really bad for batteries to sit there dead. So I decided to get one of these and, if it worked out well, get a second so I didn't have to swap it between cars. After a couple months use and a bit of testing, here's what I can tell you: 1) Don't expect this to charge a dead battery. Not designed to, and won't. What it will do is offset the natural loss in the battery and the minimal drain that the vehicle may have when off due to such things as the computer, security system, etc. There is an isolation diode contained within the solar panel to prevent back-feed drain regardless of whether the lighter or clip-on cable is used. 2) The Red LED on the lighter plug is your friend, if you know how to use it. a) Connect lighter plug to solar panel, but do not plug into lighter socket. Aim panel towards sun and observe that LED lights, then aim away from sun and it goes out. This proves that the panel is generating electricity. b) Disconnect lighter plug from solar panel and plug into lighter socket, with ignition off. Verify that LED lights. This proves that socket is live with key off. c) Connect lighter cord to panel, and install panel either on the dash, windshield or (my preference) on the passenger's visor which can be rotated to catch the best sun based on how you park. Protect the panel from the elements; this is not an outdoor panel. 3) Do NOT disconnect when driving, just rotate so it does not impede your visibility. The isolation diode will protect the panel and vehicle from each other regardless of whether the car is running or not. Frequently plugging and unplugging the lighter socket increases the chances of a bad connection inside the socket. If you must disconnect, do so at the panel end instead, and make sure the LED is on before reconnecting. If it ever seems as though it has failed, repeat the tests in step 2 above. If you do the above, I think you'll find this does what you need it to, and does it well. Hopefully this fills in the gaps in the manual, as well. Review: Great product works as advertised - Great product works as advertised. I have a Dodge Durango that doesn't get used to often and every now and then I usually start the car to charge the battery, but somehow forgot over the holidays and it drain down to nothing. So before I charge my battery and the traditional sense in plugging it into an actual car battery charger, I decided to get this solar maintainer and see what it does from an absolutely dead battery. I let a charge for one day, and later that night when I put the key in the ignition I did get a beep and then the battery died again. So after that I let a charge for two days, put the key and I heard the beep because the door was open, and it actually beeped A bunch of more times, but when I tried to actually start the car, of course it didn't start and I know that shouldn't happen at all. After that I let it charge for five days, and pretty much the same thing happen when I let it charge for two days. If anyone knows something about this please send a message or add a comment to this, the alligator clips that clip on the positive and negative are very thin metal, I wonder if I cut those off, strip the wires, then wrap the bare wire on the battery terminals if I would get a better connection and that would help or is it just simply the fact that 5 W is nothing compared to an actual car battery? ****update 7/31/15**** So honestly, it barely works with just one. You notice it, but it's not Tremendous! So I actually bought 2, 1 each for two cars. I went ahead and connect both of them together at the same time to one car. I didn't think anything of it, and didn't use/ turn on my 02 Durango for two months straight. Needed to move it the other day, when I started it up, BAZINGA WHAM BAM there it goes! She turned on so powerful I couldn't believe it. It's like as if I just installed a brand new battery. YES, it's true. I just bought two more for my other car ;) ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00QRHDIPY | | Best Sellers Rank | #679,681 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2,345 in Solar Panels | | Brand | ALLPOWERS | | Connector Type Used on Cable | cigarette lighter plug, battery charging clip | | Current Rating | 0.2 Amps | | Customer Reviews | 4.1 out of 5 stars 1,604 Reviews | | Input Voltage | 24 Volts | | Item Weight | 11.4 Ounces | | Manufacturer | ALLPOWERS | | Mfr Part Number | AP-18V5W | | Model Number | AP-18V5W | | Number of Ports | 1 | | Output Voltage | 12 Volts | | UPC | 621112731905 | | Unit Count | 1 Count | ## Product Details - **Brand:** ALLPOWERS - **Current Rating:** 0.2 Amps - **Input Voltage:** 24 Volts - **Item Weight:** 11.4 Ounces - **Output Voltage:** 12 Volts ## Images ![ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - Image 1](https://m.media-amazon.com/images/I/611MOitrO4L.jpg) ![ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - Image 2](https://m.media-amazon.com/images/I/615mJfWCb6L.jpg) ![ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - Image 3](https://m.media-amazon.com/images/I/71WvgLefBJL.jpg) ![ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - Image 4](https://m.media-amazon.com/images/I/71N1XoOUcsL.jpg) ![ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - Image 5](https://m.media-amazon.com/images/I/61xSUNC89lL.jpg) ## Questions & Answers **Q: Will this unit regulate charging, so as to avoid over-charging a battery?** A: So a lot of misinformation here... this unit comes with a blocking diode built in to the unit (I have had one of these plugged into by van for about 10 years). This blocking diode prevents the car from supplying current into the panel (like at night), which would result in slow discharge of your car battery. You can leave this plugged in all the time (like for 10 years). The person talking about the Schottky barrier diode has it wrong. This type of diode has a lower forward drop voltage (less than half a traditional silicon diode). And you DON'T put it between the two terminals... in one direction it will short your panel and car battery (blow the fuse and probably fry the diode), if you put in the other direction it does NOTHING... it is in reverse bias, and essentially no current flows. If you decide to put it in series with the charger, you will reduce the available charging voltage (and therefore the available current) by about 0.3 volts. The internal blocking diode is already doing this job. If there is someone out there that has the problem of discharging the car batter overnight, you either have a bad battery or your solar panel blocking diode is shorted (not working). **Q: I don't understand what good it is in lighter socket if car must be running. When running, battery charges anyway! What am I missing?** A: You're right. MOST cars don't power the cigarette lighter unless the key is on. So if the key is off your solar battery is not connected. That's why they give you battery clips so you can clip the PVP (PhotoVoltaic Panel) directly to the battery. You could hard wire a socket directly to the battery if you like. GO to a junk yard and scrap out an old lighter port from an older car and wire it in. Since this panel is a mere 300 mA (0.3 amps) you don't need heavy gauge wire. But you DO need to be sure you don't short out the wire on some sharp metal surface. **Q: Why would you use an 18V charger for a 12V battery. It seems to me this would be too much voltage.** A: Solar panels can put out any voltage, up to some maximum "open circuit voltage". If you put the panel in the sun, and measured the voltage across the leads without connecting it to anything, you would measure 18v, which is the open circuit voltage.Solar panels also have some voltage at which they will generate maximum power, this is the "Max Power Point", hopefully this is about 12v for this panel.The solar panel will match the voltage of any battery that you connect it to, but if the battery voltage is above the "open circuit voltage" (18v), it will not generate any electricity, and will not charge the battery.Ignore the other answers here, they are not accurate. **Q: What size is the female barrel plug?** A: The size from the actual solar unit is 5.5 x 2.5. 80w panel ## Customer Reviews ### ⭐⭐⭐⭐⭐ Does the job, so far! Read this, so you know what you're getting. *by J***S on March 16, 2017* I was a bit skeptical of these after reading so other reviews, so I did a bit of testing. Hopefully my results will be helpful. My situation is that I am retired, have 2 vehicles and don't have a need to drive much. But it seemed like every time the weather turned bad, the 4WDs battery was dead, and every time it turned nice the rag-top was dead. Not only a pain to drag out a charger, but it's really bad for batteries to sit there dead. So I decided to get one of these and, if it worked out well, get a second so I didn't have to swap it between cars. After a couple months use and a bit of testing, here's what I can tell you: 1) Don't expect this to charge a dead battery. Not designed to, and won't. What it will do is offset the natural loss in the battery and the minimal drain that the vehicle may have when off due to such things as the computer, security system, etc. There is an isolation diode contained within the solar panel to prevent back-feed drain regardless of whether the lighter or clip-on cable is used. 2) The Red LED on the lighter plug is your friend, if you know how to use it. a) Connect lighter plug to solar panel, but do not plug into lighter socket. Aim panel towards sun and observe that LED lights, then aim away from sun and it goes out. This proves that the panel is generating electricity. b) Disconnect lighter plug from solar panel and plug into lighter socket, with ignition off. Verify that LED lights. This proves that socket is live with key off. c) Connect lighter cord to panel, and install panel either on the dash, windshield or (my preference) on the passenger's visor which can be rotated to catch the best sun based on how you park. Protect the panel from the elements; this is not an outdoor panel. 3) Do NOT disconnect when driving, just rotate so it does not impede your visibility. The isolation diode will protect the panel and vehicle from each other regardless of whether the car is running or not. Frequently plugging and unplugging the lighter socket increases the chances of a bad connection inside the socket. If you must disconnect, do so at the panel end instead, and make sure the LED is on before reconnecting. If it ever seems as though it has failed, repeat the tests in step 2 above. If you do the above, I think you'll find this does what you need it to, and does it well. Hopefully this fills in the gaps in the manual, as well. ### ⭐⭐⭐⭐⭐ Great product works as advertised *by A***R on February 13, 2015* Great product works as advertised. I have a Dodge Durango that doesn't get used to often and every now and then I usually start the car to charge the battery, but somehow forgot over the holidays and it drain down to nothing. So before I charge my battery and the traditional sense in plugging it into an actual car battery charger, I decided to get this solar maintainer and see what it does from an absolutely dead battery. I let a charge for one day, and later that night when I put the key in the ignition I did get a beep and then the battery died again. So after that I let a charge for two days, put the key and I heard the beep because the door was open, and it actually beeped A bunch of more times, but when I tried to actually start the car, of course it didn't start and I know that shouldn't happen at all. After that I let it charge for five days, and pretty much the same thing happen when I let it charge for two days. If anyone knows something about this please send a message or add a comment to this, the alligator clips that clip on the positive and negative are very thin metal, I wonder if I cut those off, strip the wires, then wrap the bare wire on the battery terminals if I would get a better connection and that would help or is it just simply the fact that 5 W is nothing compared to an actual car battery? ****update 7/31/15**** So honestly, it barely works with just one. You notice it, but it's not Tremendous! So I actually bought 2, 1 each for two cars. I went ahead and connect both of them together at the same time to one car. I didn't think anything of it, and didn't use/ turn on my 02 Durango for two months straight. Needed to move it the other day, when I started it up, BAZINGA WHAM BAM there it goes! She turned on so powerful I couldn't believe it. It's like as if I just installed a brand new battery. YES, it's true. I just bought two more for my other car ;) ### ⭐⭐⭐⭐ The panel puts out the rated power. However, ... *by G***K on March 3, 2017* The panel puts out the rated power. However, I have several vehicles, none of which have an active cigarette lighter plug when the ignition switch is not left in the accessory position. So, while leaving the car for a prolonged period in an unsecured area, I'm supposed to leave the key in the ignition? Therefore I use the short cord with the clips to attach directly to the battery. The charger worked well then, but the cord is way too short. My suggestion to Allpowers is: (1) Provide a longer cord to attach directly to the battery for those many customers who need to do that. The cord-to-cord connectors they use, would work perfectly to disconnect the panel and its longer cord from the short cord left attached to the battery. Do not use a cigarette plug or connector anywhere. (2) If a cigarette lighter plug is still to be provided, delete the problematic LED light, altogether. (3) Change the panel housing from fabric to plastic and make the unit waterproof, in case one forgets to disconnect and bring the panel in when it rains. Otherwise the panel puts out even more power than another I have used for years. ## Frequently Bought Together - ALLPOWERS 18V 12V 5W Portable Solar Panel Car Boat Power Solar Panel Battery Charger Maintainer for Automotive Motorcycle Tractor Boat RV Batteries - ECO-WORTHY 12V 10W Portable Power Solar Panel for Car Boat with Alligator Clip Adapter - SUNAPEX 12V Solar Trickle Charger for Car Battery Solar Battery Charger 12 Volt Waterproof 1.8W Solar Battery Maintainer for Car Truck Boat RV Motorcycle Marine Trailer Battery --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/10376376-allpowers-18v-12v-5w-portable-solar-panel-car-boat-power](https://www.desertcart.jp/products/10376376-allpowers-18v-12v-5w-portable-solar-panel-car-boat-power) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-22*