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Sunway Solar

Sunway Solar Car Battery Trickle Charger & Maintainer 12V Solar Panel Power Kit Portable Backup for Car Automotive RV Marine Boat Motorcycle Truck Trailer Tractor Powersports Snowmobile Farm Equipment

    • Based on 5,993 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Jun 6
Order within 4 hours and 50 minutes
Available payment plans shown during checkout

Size: 4W


Features

  • [Solar Panel Power Up To 4W]--Keep your 12 Volt batteries topped off with this solar battery trickle charger ,which helps to manage 12v battery drain in all seasons. Designed to compensate for small, steady battery drains from the vehicle's clock or alarm system.
  • [Stronger and Durable]--This solar powered battery charger is Covered with ultra clear PV glass which is more efficient and also with Durable ABS plastic housing which makes this solar panels charger more stronger. Low Maintenance!
  • [For Any Rechargeable 12Volt Batteries]--This solar battery trickle charger is the eco-friendly way to maintain and safely charges Wet, Gel, SLA, AGM and Deep Cycle batterie. It can maintain the charge of any cars, trucks, marines, motorcycles , tractors, ATVs, snowmobiles, boats and personal water crafts or RV 12 volt battery!
  • [Reverse Charging Protection]--With BUILT-IN DIODE for prevents reverse charging from batteries.With a 12volt LED charge indicator. The Led light up when it is charging. The solar charger maintainer Includes cigarette lighter adapter and alligator battery terminal clamps. We offer 12-Month warranty and good customer service.

Manufacturer: ‎Sunway Solar


Brand: ‎Sunway Solar


Model: ‎3W solar trickle charger for battery


Item Weight: ‎1.44 pounds


Product Dimensions: ‎13.9 x 5 x 0.5 inches


Item model number: ‎4W solar trickle charger for battery


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎SWS-C3W001


Voltage: ‎15 Volts


Wattage: ‎4 watts


Date First Available: December 4, 2016


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jun 6

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Works great
Size: 1.5W
Short answer: Contrary to some of the negative reviews speaking about "warping", "discharging your battery" and other such things, it works exactly as advertised. I drive the test vehicle only a handful of times per year, so it sits outside for months on end sometimes which is bad for batteries, they like to be topped off all the time due to their internal chemistry. Long answer: I'm an Electrical Engineer so I did a few basic tests, with the following findings and some recommendations: NOTES: DO NOT leave the panel plugged in when starting or driving, spikes in the line might cause damage to the circuitry. It could fail and then put a load on the battery in that case. NO test for weather/water resistance was conducted, I have yet to test it in the winter time, which is a more challenging time for it and batteries too. I'm optimistic it will work ok given what I've seen so far. I tested this resting on the dashboard (no suction cups, I wouldn't trust that ever), with clear view of the sky facing generally slightly east of North during mid-late August, near the Washington DC area using a cigarette lighter connection with the supplied adapter. (it's FUSED, and works with a NEGATIVE ground socket/system, i.e. most everything not vintage) Some people have said the cig cable polarity is backwards, but in order to work as a CHARGER, the + connects to + as it should! Btw, the BLUE LED does NOT adversely effect the performance, and need not be "disabled" as some have claimed. The numbers I'm reporting are all with the unit as delivered, no modifications were made. 1) NO Battery discharge when dark (i.e., it doesn't drain your battery in the dark, or ever due to internal diode) Tested on the bench as well with a power supply and ammeter. 2) NO WARPING of case in direct sun 8hrs/day mid latitude US East Coast in August. (measured CABIN peak temps up to 117 deg, low of 69F, dash probably hotter in direct sun). ABS plastic has a glass transition temp (i.e. warping) around 105C (221F) so IF it is actually ABS, no melting/warping seems possible at temps found in cars NOT on fire lol! 3) For a HEALTHY battery, it MAINTAINS charge easily overcoming a parasitic drain in my vehicle of 9mA or (0.009Amps), and still puts a NET 44mA (0.044Amps) charging current INTO the battery in direct noon sun, and a NET positive charge current (in clouds/overcast), albeit only 7.3mA. In only 1 sunny day (and overnight) my new battery @ 12.34v went to 12.55v from this device. This is because it is a HEALTHY battery. The max open circuit voltage of the charger I measured around 22v but it can only deliver 1.5W max so you aren't going to hurt the battery with such low currents, and at best charging currents are only present up to about a 1/3 the time during a 24 hr period I'd estimate. NOTE: A dead/failing battery cannot be rescued by this or any charging device, and my prior failed battery at 12.24v (after 2 day commercial charge from "dead") with this same device under same summer conditions in 2 days went down to 12.01v and failed to turn over the engine! After the attempt it was down to 11.5v, clearly no good. I think this is suited as a MAINTAINER, don't bother thinking this will "charge" a vehicle battery. I drive that vehicle very very rarely, so this will keep the battery ready to go without having to periodically start it every few weeks to charge it up. Temperature and time will reduce the efficiency of the panel, but there is a 4x margin in my case (with a 9mA parasitic drain, which is quite small). If your car has a lot of electronic features, security systems etc, your parasitic drain could be more than this can even put out. In that case you would need a bigger higher power panel (this is only 1.5W). To measure the parasitic drain: with all vehicle doors shut, pull the main battery fuse and put an ammeter there, since it will measure absolutely everything, using any other fuse will only get a subset of what your battery drain is. Start with the maximum scale (typically 10A) to be safe, switch to smaller scales once you know the range. Let the initial connection settle since there will be a surge for a bit as all the electronics initialize and settle into a steady state. My vehicle settled in about 5 seconds (an after market CD player self test used 250mA during that 5 seconds) In principle, some sensors and other fancy stuff could spike some current periodically, but this couldn't be known without a logging ammeter. In all likelihood it won't boost the average drain in any significant way from your measured steady state. ... show more
Reviewed in the United States on August 27, 2022 by Noble
    • My 2nd one, works PERFECTLY, last for years
Size: 1.5W
This is perfect for preserving lawnmower batts over the off season. I have not tested to determine if they work for larger ( auto) batts. They do not generate much power, yet are sufficient for my [present] application. WAY less costly vs. replacing discharged batts. Also - the amorphous solar panel is the preferred application for all climates/weather zones as they are at highest output/ efficiency in the desired/appropriate spectrum for intermittent, cloudy, low light. Also, obviously the full sun as well. This company is doing it right. I have these units outdoors 24/7, never an issue with UV degradation nor moisture intrusion. I am a mechanical engineer and very critical of devices. These are excellent. STRONG CONFIDENT PURCHASE ... show more
Reviewed in the United States on November 28, 2023 by ED M
    • Works great! Suction cups don’t though
Size: 8W
This may be obvious, but leave it in a place that has the most sun exposure. I failed to do that the first time and came back to a dead car battery after 2 weeks. Next time I left it in a sunnier spot and it worked great! Used for 6 extended business trips and always come back to a starting car. Well, after the first trip… Also, the suction cups are useless, just set it on a box or the bed in the back. ... show more
Reviewed in the United States on December 19, 2023 by C. Shrout
    • very handy
Size: 1.5W
I have not put the device outside exposed to the elements, so I posted neutral on that aspect. But I have used it on my motorcycle battery and to trickle charge my generator battery. It is nice to keep them topped off for the winter months. I did use it on my car via the cigarette lighter and that worked great also. I am most likely going to purchase a couple more of these units. ... show more
Reviewed in the United States on December 22, 2023 by wiretap68
    • Does what is advertised
Size: 1.5W
It did as advertised and runs a trickle charge off the sun. No problems yet with my battery. When it's cloudy, the charge rate is lower, but that is what solar does. No problems.
Reviewed in the United States on December 6, 2023 by Mr.Malfoy8
    • Worked well for a couple of months
Size: 4W
This worked well for a couple of months and kept my car battery charged. But then it stopped working and I noticed it is now warped and cracked. You'd think something intended to be in the sunlight every day wouldn't be made of cheap plastic.
Reviewed in the United States on November 2, 2023 by Thomas Smith
    • Works well !
Size: 1.5W
I have 5 of these for all my quads, no issues. Slow charges to full voltage which leads 2 easy starts. You need these if you have toys.
Reviewed in the United States on November 5, 2023 by Alfredo Wright
    • Worked great but then stopped working
Size: 8W
Worked great for my little Jackery 200w and other small items I had but now it completely stopped working. I’ve never dropped, messed with, or stored it improperly. Even when plugged into my little Jackery with full sun all day it shows less than 4 watts. It used to charge up my Jackery if I left it in for a couple/ few hours no problems. So I’m not sure how the panel just died. It’s in perfect condition and I’m just disappointed I can’t use it anymore. ... show more
Reviewed in the United States on November 10, 2023 by Chris S.

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