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15W 12V Solar Battery Maintainer & Trickle Charger

$27.99
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Key Features

• 15W Enhanced Power and 30% high-efficiency A+ monocrystalline cells provide faster, more effective battery maintenance

• Intelligent GaN Safety Protects against over-charge, over-current, over-voltage, short-circuits, reverse charging, and over-temperature

• Extreme Weather Resilience IP68-rated design stands up to 2400Pa wind and 3600Pa snow loads

• Superior Durability Features robust 1.6mm tempered glass and an anodized aluminum alloy frame

• Universal 12V Compatibility Supports LiFePO4, Lithium Ion, AGM, SLA, GEL, FLD, EFB, and MF battery systems

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DescriptionSpecsIncludesDownloadsFAQReviews
Callsun 15W 12V solar battery maintainer trickle charger connected to a car engine bay in a driveway, with a boat on a trailer nearby.

Why Choose Callsun Solar Panel

Feature Callsun Solar Panel Other Solar Panels
Efficiency 30% 20%
Installation 360° Flexible Installation 180° Flexible Installation
Waterproof IP68 IP65
Frame Anodized Aluminum Alloy General Aluminum Alloy
Glass 1.6mm Tempered Glass 0.6mm Tempered Glass

Rugged All-Weather Protection

IP68 waterproofing, impact-resistant glass, and corrosion-resistant aluminum withstand heavy snow, wind, and harsh outdoor conditions.

Callsun 15W solar battery maintainer with IP68 waterproof design, wind and snow load resistance, tempered glass, and aluminum frame.

High-Efficiency Adjustable Design

30% efficiency, 360° adjustability, IP68 protection, anodized aluminum, and 1.6mm tempered glass deliver durable performance.

Callsun 15W solar battery maintainer comparison chart showing 30% efficiency, 360° adjustable angle, IP68 waterproof, and tempered glass.

360° Adjustable Mounting

360° adjustable bracket optimizes sunlight capture for ground, wall, flat-roof, and sloped-roof installations.

Callsun 15W solar battery maintainer panel shown in four different adjustable mounting scenarios, demonstrating versatile installation.

Advanced Charging Protection

Comprehensive protection guards against overcharge, over-current, short circuits, overheating, reverse charging, and over-voltage.

Callsun 15W solar battery charger safety features diagram showing indicator lights, overcharge, short-circuit, and over-current protection.

Long-Term Battery Maintenance

Prevent battery discharge and maintain peak health for cars, trucks, and stored vehicles during long periods of non-use with reliable solar power.

Callsun 15W solar battery maintainer plug-and-play setup showing a man connecting the charger to a car battery for vehicle maintenance.

Durable High-Efficiency Construction

High-efficiency monocrystalline cells, tempered glass, EVA, TPT, anodized aluminum, and IP68 protection ensure lasting performance.

Callsun 15W solar battery maintainer layers diagram showing 30% efficiency, IP68 waterproof, monocrystalline cells, and tempered glass.

Versatile 12V Battery Maintenance

Maintains 12V batteries for cars, RVs, boats, ATVs, motorcycles, trailers, lawn mowers, and water pumps.

Callsun 15W solar battery maintainer application scenarios showing compatibility with cars, RVs, boats, motorcycles, trailers, pickups, lawn mowers, and water pumps.

Specifications

Key Specs at a Glance 15W output · 30% efficiency · Adjustable Angle(360°) · IP68

Mechanical Characteristics(STC)

Maximum Power (Pmax) 15W
Maximum Power Voltage (Vmp) 20.16V
Maximum Power Current (Imp) 0.75A
Open-circuit Voltage (Voc) 24.3V
Short-circuit Current (Isc) 0.79A
Cell Type Monocrystalline Silicon

*STC(Standard Test Condition): Irradiance 1000W/m², Cell Temperature 25°C, Air Mass 1.5.

Specifications

Dimension 303 × 333 × 20 ± 5 mm (11.9 × 13.1 × 0.8 ± 0.2 in)
Weight 1.7kg(3.75 lb)
Operating Temperature Range 14°F ~ 158°F (-10°C ~ 70°C)
Glass 1.6mm Tempered Glass
Frame Anodized Aluminium Alloy
IP Rating IP68
Max. Wind Load/Snow Load 2400Pa/3600Pa
Compatible With 12V LiFePO4, Lithium Ion, AGM, SLA, GEL, FLD, EFB, MF batteries

Includes

Downloads & View

User Manual

View Download

FAQ

1. What types of batteries and vehicles does this charger support?

This charger is designed for 12V systems only and supports LiFePO₄, AGM, SLA, GEL, FLA, EFB, and MF batteries. It’s ideal for cars, RVs, boats, motorcycles, campers, trailers, lawn mowers, and jet skis.

2. What is the 3-stage smart charging, and how does it protect my battery?

The controller automatically cycles through three stages: Bulk (fast charge), Absorption (steady top-off), and Maintenance (continuous pulse trickle). This prevents overcharging and optimizes long-term battery health.

3. Can this solar charger operate in freezing winters or extreme summer heat?

Yes. The panel features an IP68 waterproof rating, tempered glass, and a corrosion-resistant frame, ensuring stable power output across a temperature range of -10°C to 70°C.

4. Will this solar panel drain my battery at night or in zero sunlight?

No. The built-in controller includes a 6-in-1 protection system with a dedicated reverse current safeguard. This completely blocks power from flowing backward from the battery to the panel at night.

  • 5 stars: 23 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
D
Donald A.
15W charger

Just wish it was weather proof, worked great othwr than that

T
THOMAS

Works as expected and is well made

G
Glenn B

I Love this trickle charger, the price was on point....

r
ro27
Good design

Works as described.Good price.Good packing.Fast shipment.Would buy again'

F
Frugal
Seems to work as it should.

The solar maintainer appears to be working well.

e
eff B
15w solar trickle charger

Priced right and very useful for keeping coach batteries topped off.

G
GERARD
No issues so far.

Quality seemed decent. No surprises. Haven't checked voltage output yet.

R
Redneck
15w solar maintainer

Impressed with quality that it will last with care

D
Dsimes
Great Product!

This is my second 15W I’ve purchased to keep batteries charged during the winter months. Great product!

J
Jeff
Fantastic product!

After I bought the first one, it worked so well I bought three more for my other vehicles. Highly recommend them.

R
Robert D.

Great purchase. Needed a small solar panel just to keep batter charged and this does the trick. I would recommend for any one looking to do the same.

D
Dude
Tough - Portable - Well thought out Design

Needed a multi-use charger. Primary use for keeping my Crossfire battery in good health. Secondly, for outdoor use - I'll pack it on my eBike.

S
Steve

Needed a maintainer for our batter out at our Cabin - off grid. This works perfectly. We can use it for many different uses however for charging phones and all it works great.

d
do53
Simple, effective, easy to install!

The kit contains everything you need to start maintaining your battery in a matter of a few minutes. What more could a person ask for?

K
Katie
Includes nice accessories

Nice little trickle charger for small batteries. I appreciate that callsun includes several ways to connect this to the battery, either using rings or clips. For a similar cost, I would encourage most people to buy the 15 watt

D
Dep
Works great.

Works great. Use it to trickle the charge on my boat battery while I listen to music, charge phone and use the fish finder, without worrying about a flat battery.

S
Sparky
Great deal when on sale!

Great quality as expected from Callsun with all the additional accessories/adapters that you would need! It gets the job done without a fuss. No complaints whatsoever and a great deal when it's on sale...

S
ShawnA
Time and frustration saver

I have installed several of panels these on vehicles that I don't use regularly and it saves me time and frustration of dead batteries, when I go to start my tractor, boat, collector and beater cars. I have found a fuse tap works well on vehicles that shut off the lighter outlet with the ignition.

J
Joe27
Quality Product

Good Quality Product. Decent quality for the Price point.

B
BLAS

This Callsun 15-watt charger is well designed and worth the higher cost vs the 15-watt options. For my trickle charging needs, I purchased a separate 16-ft SAE cable. The first use was for charging a tested/good car battery, using the incl alligator clips, and the charge increased by 24 percent over the 2.5 hours it was connected. I am very satisfied with this purchase.

b
brocjeff

So far, so good!

j
joseph
Best purchase of the year for me.

This works perfectly.. I have a chevy Silverado and have been having battery drain after a few days of not using my truck so I purchased this and went on a 7 day Cruise leaving my truck parked in the parking lot. Nervously as walk up to my truck and hit the auto start and without a struggle my truck started. I could not be more pleased with this battery tender.

J
John
Quick & Efficient / suction cup flaps swing 180° !

A less known benefit of choosing this one is that it has a durable suction cup mounting capability where panel can mount to take solar uptake *behind* sun-exposed glass, OR, with its suction cup side flaps swung under panel 180° can position panels facing out on any smooth surface.

That suction cup adjustability is innovative & useful 👌🏼