---
product_id: 154788770
title: "POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc"
brand: "powoxi"
price: "¥29611"
currency: JPY
in_stock: true
reviews_count: 13
category: "Powoxi"
url: https://www.desertcart.jp/products/154788770-powoxi-upgraded-20w-solar-battery-charger-maintainer-external-smart-3
store_origin: JP
region: Japan
---

# Smart 3-stage PWM charge controller USB charging cable included 20W high-efficiency solar power POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc

**Brand:** powoxi
**Price:** ¥29611
**Availability:** ✅ In Stock

## Summary

> ☀️ Power your freedom with smart solar energy—never get stranded again!

## Quick Answers

- **What is this?** POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc by powoxi
- **How much does it cost?** ¥29611 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/154788770-powoxi-upgraded-20w-solar-battery-charger-maintainer-external-smart-3)

## Best For

- powoxi enthusiasts

## Why This Product

- Trusted powoxi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First, Always:** Built-in overcharge, overvoltage, short circuit, and reverse polarity protection ensures worry-free, year-round battery maintenance.
- • **Plug & Play Convenience:** Includes SAE to 5V USB cable for direct device charging—stay powered on the go with eco-friendly solar energy.
- • **Universal Compatibility:** Perfectly designed for cars, motorcycles, RVs, boats, and marine vehicles—your all-in-one battery maintainer.
- • **Intelligent Battery Care:** Advanced 3-stage PWM controller with STM8 microprocessor extends battery life by optimizing charge cycles and preventing overcharge.
- • **Effortless Solar Power Boost:** Harness 20W of premium monocrystalline silicon solar energy to keep your 12V battery perpetually charged, rain or shine.

## Overview

The POWOXI Upgraded 20W Solar Battery Charger Maintainer is a cutting-edge, weatherproof solar panel kit featuring a high-efficiency monocrystalline silicon cell and an external smart 3-stage PWM charge controller. Designed for 12V batteries in cars, motorcycles, RVs, and marine vehicles, it intelligently manages battery health with microprocessor control, offers USB charging convenience, and ensures comprehensive protection against electrical faults. Ideal for professionals who demand reliable, eco-friendly power maintenance during long idle periods.

## Description

POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc: desertcart.co.uk: Business, Industry & Science

Review: Brilliant Little Solar Charger – Kept My Truck Battery Topped Up for 6 Weeks! - Before heading off for a six-week trip over Christmas to visit friends and family in Australia and New Zealand, I realised I had a small problem — I’d be leaving my truck sitting idle for quite some time. Anyone who’s dealt with a flat battery after a long break knows how frustrating that can be, so I wanted a reliable way to keep the battery topped up while I was away. After some research, I decided on the Upgraded 7.5W Solar Battery Trickle Charger Maintainer – 12V Portable Waterproof Solar Panel Trickle Charging Kit. It looked like the perfect solution: simple, compact, and completely self-sustaining. A lot of online advice suggested just plugging a solar charger into the vehicle’s cigarette lighter socket, but when I checked with Ford, they advised against it — apparently, in my model, that port isn’t live when the ignition’s off. So instead, I followed their recommendation and connected the charger directly to the battery. The setup was straightforward. The kit comes with crocodile clips for easy connection and a generous cable length that easily reached from the battery to the inside of the truck. The included suction cups can be attached to either the front or back of the solar panel, so I mounted it neatly on the inside of the windscreen, where it could catch the light without being obtrusive. The cable is thin enough that the door seal closes perfectly around it, leaving a discreet and tidy setup. While I was away, I didn’t have to give it another thought. The solar trickle charger quietly did its job, keeping the battery topped up day after day. When I returned home six weeks later, I unclipped it, turned the key—and the truck started first time without so much as a flicker. No power loss, no sluggish start, no hassle. The build quality feels solid, and the performance exceeded my expectations. It’s weatherproof, easy to mount, and perfect for anyone who leaves their vehicle parked up for long periods—whether it’s a car, truck, camper, or boat. I’d just advise checking your specific vehicle setup before installing it, as not all models allow charging through the same method. Once you’ve got it right though, it’s brilliant. All in all, this solar trickle charger is one of those practical, inexpensive tools that just works. It’s saved me time, stress, and probably a few jump-starts down the line. Highly recommended for anyone who wants peace of mind while their vehicle’s sitting idle.
Review: Good battery maintainer - Surprised by the effectiveness of this little solar panel. Used to maintain the battery on my Audi A8, as the car is infrequently used. This won't recharge a flat battery if it's dead but will restore one that is slightly down or not used for long periods. Easy to use and well made produces 13.2 volts in overcast conditions I'll up date voltage when in full sunlight once we get a clear day. Connections are very tight to plug and unplug so be careful with them. Overall very happy with the unit.

## Features

- Latest Design In 2026: 20-watt high-efficiency single- crystal silicon solar charger, can generate electricity in any weather. Supporting on the ground can receive better sunlight with mounting bracket, Can maintain your 12-volt battery perennially
- USB Charging Made Easy: Enhance your solar experience with our new SAE to 5V USB charging cable. You can conveniently charge your mobile devices directly from the solar panel. Enjoy the flexibility and eco-friendly performance of solar power and convenience
- Intelligent Charging and Maintenance: External 3-stage PWM controller increases power by 20%-30% compared to traditional models. The STM 8 microprocessor intelligently manages charging, extends battery life, and maintains batteries efficiently year-round
- All-Round Protection: Offers overcharge, overvoltage, short circuit, and invert polarity protection. The controller automatically shuts down at night to save power and restarts during the day, ensuring safe year-round battery maintenance
- LED Indicator: The LED indicators offer a clear view of battery status. When both blue and red lights are on, the battery is charging. When blue, red, and green lights are all on, the battery is fully charged. Easily monitor the battery's condition

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07TY3HGF7 |
| Best Sellers Rank | 424 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 1 in Solar Panels (Business, Industry & Science) |
| Customer Reviews | 4.3 4.3 out of 5 stars (8,796) |
| Date First Available | 13 July 2019 |
| Item display weight | 1.81 kg |
| Item model number | ABS Solar 20W |
| Manufacturer | POWOXI |
| Material type | Monocrystalline Silicon, ABS+PC |
| Part number | Solar Panel 20W |
| Power source type | Solar Powered |
| Product Dimensions | 41.4 x 39.12 x 2.03 cm; 1.81 kg |

## Product Details

- **Brand:** POWOXI
- **Efficiency:** High Efficiency
- **Item weight:** 1.81 Kilograms
- **Material:** Monocrystalline Silicon, ABS+PC
- **Product dimensions:** 43L x 40.5W x 5.5H centimetres

## Images

![POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc - Image 1](https://m.media-amazon.com/images/I/413o0QRjWdL.jpg)
![POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc - Image 2](https://m.media-amazon.com/images/I/517xkMK72+L.jpg)
![POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc - Image 3](https://m.media-amazon.com/images/I/51XSzGzTwzL.jpg)
![POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc - Image 4](https://m.media-amazon.com/images/I/51hM2aYtgNL.jpg)
![POWOXI-Upgraded-20W-Solar-Battery-Charger-Maintainer, External Smart 3-Stages PWM Charge Controller, 12V Solar Panel Trickle Charging Kit for Car, Marine, Motorcycle, RV, etc - Image 5](https://m.media-amazon.com/images/I/51huvjLoYrL.jpg)

## Questions & Answers

**Q: Can i charge my van via the obd 2 port using this solar panel?**
A: I imagine you can as, i cgarge my Mercedes suv no problem, but i would suggest fixing the panel to something solid as its quite large and can blown around by strong winds.I would rate it 10/10

**Q: Can I use this panel to charge the battery for electric fence whilst using it.**
A: I have one connected to my motorhome leisure battery and never disconnect it. I personally have never had a problem leaving it connected whilst using the battery to power my habitation area.

**Q: What does a red led light mean in the charging indicator?**
A: red: charging; green: the battery is fully charged

**Q: Can i charge my car battery using the obd2 connection - if i substitute an obd2 to sae cable for the alligator cable?**
A: I use an SAE - OBD2 connector for mine and it works just fine, BUT make sure you get and OBD2 - SAE connector in the correct gender.  Many of these adaptors are designed to take power off the OBD2 port and so the SAE connector is the wrong gender to put power into it.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Brilliant Little Solar Charger – Kept My Truck Battery Topped Up for 6 Weeks!
*by L***T on 9 October 2025*

Before heading off for a six-week trip over Christmas to visit friends and family in Australia and New Zealand, I realised I had a small problem — I’d be leaving my truck sitting idle for quite some time. Anyone who’s dealt with a flat battery after a long break knows how frustrating that can be, so I wanted a reliable way to keep the battery topped up while I was away. After some research, I decided on the Upgraded 7.5W Solar Battery Trickle Charger Maintainer – 12V Portable Waterproof Solar Panel Trickle Charging Kit. It looked like the perfect solution: simple, compact, and completely self-sustaining. A lot of online advice suggested just plugging a solar charger into the vehicle’s cigarette lighter socket, but when I checked with Ford, they advised against it — apparently, in my model, that port isn’t live when the ignition’s off. So instead, I followed their recommendation and connected the charger directly to the battery. The setup was straightforward. The kit comes with crocodile clips for easy connection and a generous cable length that easily reached from the battery to the inside of the truck. The included suction cups can be attached to either the front or back of the solar panel, so I mounted it neatly on the inside of the windscreen, where it could catch the light without being obtrusive. The cable is thin enough that the door seal closes perfectly around it, leaving a discreet and tidy setup. While I was away, I didn’t have to give it another thought. The solar trickle charger quietly did its job, keeping the battery topped up day after day. When I returned home six weeks later, I unclipped it, turned the key—and the truck started first time without so much as a flicker. No power loss, no sluggish start, no hassle. The build quality feels solid, and the performance exceeded my expectations. It’s weatherproof, easy to mount, and perfect for anyone who leaves their vehicle parked up for long periods—whether it’s a car, truck, camper, or boat. I’d just advise checking your specific vehicle setup before installing it, as not all models allow charging through the same method. Once you’ve got it right though, it’s brilliant. All in all, this solar trickle charger is one of those practical, inexpensive tools that just works. It’s saved me time, stress, and probably a few jump-starts down the line. Highly recommended for anyone who wants peace of mind while their vehicle’s sitting idle.

### ⭐⭐⭐⭐⭐ Good battery maintainer
*by A***N on 4 December 2025*

Surprised by the effectiveness of this little solar panel. Used to maintain the battery on my Audi A8, as the car is infrequently used. This won't recharge a flat battery if it's dead but will restore one that is slightly down or not used for long periods. Easy to use and well made produces 13.2 volts in overcast conditions I'll up date voltage when in full sunlight once we get a clear day. Connections are very tight to plug and unplug so be careful with them. Overall very happy with the unit.

### ⭐⭐⭐⭐ Effective
*by J***M on 24 November 2025*

Seems good quality, apart from connectors which are very poor & came apart on first use!!

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*