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20W 12V Solar Battery Maintainer & Trickle Charger

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Key Features

• 20W Rapid Charging utilizes 30% efficient PERC monocrystalline cells for superior energy replenishment

• Flexible 360° Installation allows for precise angle adjustments to maximize daily solar energy capture

• Extreme Weather Resilience is guaranteed by an IP68-rated design that withstands 2400Pa wind and 5400Pa snow loads

• Rugged Build Quality features 1.6mm tempered glass and a corrosion-resistant anodized aluminum alloy frame

• Universal 12V Battery Support is compatible with LiFePO4, Lithium Ion, AGM, SLA, GEL, FLD, EFB, and MF chemistries

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DescriptionSpecsIncludesDownloadsFAQReviews

20W 12V Solar Battery Maintainer & Trickle Charger

A+ monocrystalline cells, IP68 protection, and 3-stage charging reliably maintain 12V batteries for cars, RVs, boats, and motorcycles.

Callsun 20W 12V solar battery maintainer connected to a car with an open hood in a residential driveway, with text reading "Keep Your Battery Fully Charged & Ready".

Rugged All-Weather Protection

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

Callsun 20W solar panel features IP68 waterproofing, 2400Pa wind/5400Pa 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 20W solar battery maintainer comparison chart showing 30% high efficiency, 360° adjustment, IP68 waterproofing, and an aluminum frame versus standard models.

360° Adjustable Mounting

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

Callsun 20W solar battery maintainer featuring a 360° sun-tracking bracket shown in various outdoor mounting positions including on rocks, walls, and roofs.

Advanced Charging Protection

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

Callsun 20W solar battery maintainer controller featuring indicator lights and safety protections for 12V batteries, including overcharge and short circuit 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 20W 12V solar battery maintainer showing plug-and-play setup for stored vehicle battery maintenance.

Durable High-Efficiency Construction

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

Callsun 20W solar panel layer structure breakdown showing tempered glass, monocrystalline cells, EVA, TPT backsheet, IP68 seal, and an aluminum frame.

Versatile 12V Battery Maintenance

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

Callsun 20W solar battery maintainer compatibility guide showing application examples for cars, RVs, boats, motorcycles, trailers, pickups, lawn mowers, and water pumps.

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

Specifications

Key Specs at a Glance 20W output · 30% efficiency · Adjustable Angle(360°) · IP68

Mechanical Characteristics(STC)

Maximum Power (Pmax) 20W
Maximum Power Voltage (Vmp) 20.23V
Maximum Power Current (Imp) 0.99A
Open-circuit Voltage (Voc) 24.37V
Short-circuit Current (Isc) 1.04A
Cell Type Monocrystalline Silicon

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

Specifications

Dimension 303 × 408 × 20 ± 5 mm (11.9×16.01×0.8 ± 0.2 in)
Weight 1.95kg(2.3lb)
Compatible with 12V LiFePO4, Lithium Ion, AGM, SLA, GEL, FLD, EFB, MF batteries
Glass 1.6mm Tempered Glass
Frame Anodized Aluminium Alloy
IP Rating IP68
Max. Wind Load/Snow Load 2400Pa/3600Pa

Includes

Downloads & View

User Manual

View Download

FAQ

1. What types of batteries are compatible with this 12V solar charger?

This smart 12V solar charger works with LiFePO4, Li-ion, AGM, SLA, GEL, FLD, EFB, and MF batteries. It's suitable for cars, RVs, boats, motorcycles, campers, lawn mowers, trailers, water pumps, and electric fences.

2. What is the purpose of the corner guards on this solar panel?

The integrated corner guards provide dedicated drop protection, shielding the tempered glass and aluminum frame from impact damage during transport, setup, or accidental drops in harsh outdoor environments.

3. What happens if I accidentally reverse the polarity or cause a short circuit?

The built-in controller features a 6-in-1 protection system. If you reverse the alligator clips or cross the wires, the safety circuit automatically cuts off power to prevent any damage to your battery or the charger.

4. How does the included 360° adjustable mount help with installation?

The 360° swivel mount allows you to adjust the angle of the solar panel flexibly. To maximize charging efficiency, use the included hardware kit to mount it in a location where it can face direct sunlight without shade.

  • 5 stars: 14 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
m
michael
works in low light

i place it under a table lamp at night gives enough power to trickle charge my backup phone charger.

L
Lovitus
Back up power

Back up power for my car lithium Lipo 4 battery . Works great when sitting in the sun.

E
ElectronMan

Works great for keeping the battery charged on my pickup that is rarely used. Light weight, sturdy, and with regulated voltage so it will not overcharge. I ordered a second one for my quad.

B
Bruce
Works Great!

I like the fact that this device works.

M
MickeyD
Solar power 12 v battery charger

Bought this solar panel battery charger to replace one that went bad. I am using it on my lawn tractor, has been in use for about 3 weeks and no problems. The other unit lasted a few years so for the price it's a deal! Better than using an electric charger in an outdoor situation. I am using another one like this at my sisters house for her zero turn unit. It has been in service for about two years with no issues!

M
Marty
Just the right size

Charge my battery perfect keeps it charged

o
orian74

Neat and simple to hook up. Looks excellent high quality product

R
Romain
High quality. Works really well.

This is an expensive product, but must be the best on the market. Extremely well made, and keeps the battery in tip top condition for long periods where my vehicle is not used.

r
r_m_k_84

Just the job for keeping the camper van battery topped up during periods of inactivity. Quite expensive but a quality product which is worth paying for!

i
indiananail-3

Produit efficace et performant - Je possède un autre optimate sur secteur pour recharger la moto - le solar je l’utilise pour le maintien de la batterie de mon véhicule en stationnement. Le panneau est installé sous le pare-brise. Batterie véhicule diesel.

N
Niels
Works

It is easy to use and hook up, the smart controller is great

F
Frederic
Excellent. .

Très facile à installer.

Mon panneau n'es pas vraiment exposé au soleil (sous une avancée de toit) et malgré ça, la batterie est restée chargée...

J'utilise très peu ma moto en hiver..

N
Niels
Tecmate Optimate Solar Duo Ladegeräte Batterieladegerät

Hervorragendes Solarmodul, das nur ein wenig Sonnenlicht braucht, um zu funktionieren, und es ist wirklich Plug and Play, sehr empfehlenswert

M
Maritimer
Keeping the bike’s battery topped up in storage

Mounted this little panel on our storage shed’s south wall at the right angle for winter using an old folding aluminum lawn chair. Ran the cable inside through a water tight rig in the wall. Plugged it into the leads attached to motorcycle’s battery to keep it topped and conditioned through the winter. Very impressed. Measured 20 volts in the cable during partly cloudy day. The smart charger reduced that to normal charging voltages at the battery, brought the battery to full with its cycling routinely and now is floating. Even on a rainy late fall day! When I first got it, I tested it by recovering a friend’s discharged battery. Impressive.