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Schumacher SP-400 4.8W Solar Battery Charger / Maintainer

4.3 out of 5 stars 47 customer reviews
| 23 answered questions
List Price: $85.38
Price: $49.04 & FREE Shipping. Details
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  • Enter your model number above to make sure this fits.
  • Maintains and extends the life of your 12 Volts auto, deep cycle, gel cell and heavy duty batteries
  • Environmentally safe - no electricity needed
  • Plugs into 12 Volts DC accessory outlet or directly to battery; includes battery clips and 12 Volts accessory plug
  • Easy installation for permanent mounting - hardware included
  • Manufacturer recommends using the SPC-7A solar charge controller (sold separately) in conjunction with the solar battery charger for added battery overcharge protection
› See more product details
21 new from $49.04
$49.04 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Schumacher SP-400 4.8W Solar Battery Charger / Maintainer
  • +
  • Schumacher SPC-7A 12 Volt Solar Charge Controller
  • +
  • Schumacher EC-25 25' Cable Connector Extension Cord
Total price: $77.06
Buy the selected items together

Product Information

Technical Details

Brand Schumacher
Model SP-400
Item Weight 3.9 pounds
Product Dimensions 14.4 x 13.6 x 0.5 inches
Origin China
Item model number SP-400
Manufacturer Part Number SP-400

Additional Information

ASIN B005MVB524
Customer Reviews
4.3 out of 5 stars 47 customer reviews

4.3 out of 5 stars
Best Sellers Rank #18,327 in Automotive (See top 100)
#126 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#361 in Automotive > Replacement Parts > Batteries & Accessories
Shipping Weight 3.9 pounds (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available September 13, 2011

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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From the Manufacturer

SPC-7A SP-100 SP-200 SP-400 SP-1500 SP-5400
Type Solar Charge Controller for 12V Solar Panels and Batteries Foldable Solar Charger Solar Battery Maintainer Solar Charger / Maintainer Solar Charger / Maintainer Solar Panel Kit
Environmental Safe ✓ ✓ ✓ ✓ ✓ ✓
Watts Handles up to 100 Watts of Solar Power 10 2.4 4.8 15 54
USB Port ✓
Quick Connect 12V Accessory Plug ✓ ✓ ✓ ✓
12V Female Charging Cable ✓
Quick-Connect Battery Clip Cable Assembly ✓ ✓ ✓
Includes SPC-7A Charge Controller ✓ ✓

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Customer Questions & Answers
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Customer Reviews

Top Customer Reviews

4.0 out of 5 starsIf you first charge your battery to the recommended 12. 5 to 13
By Rene on October 6, 2015
Here's the secret Sparky:

Don't try to use these solar maintainers as battery chargers. If you first charge your battery to the recommended 12.5 to 13.2 volts, these units will maintain that charge rate if exposed to regular sunshine.

If you put a solar "charger" on a dead battery, it won't dependably raise the voltage to that 12.5 to 13.2 volts, and the battery will "memorize" that reduced charge level and never again take a full charge.
Your battery is now history!

Another tip.
If you are going to use the included cigarette lighter plug to keep the battery in your vehicle charged, make certain that lighter socket isn't "switched", meaning if you shut-off your ignition the lighter plug goes dead. The lighter circuit must be "hot" whether the ignition is on or not for the charger/maintainer to do its job. If the lighter is shut-off when you take the key out of the ignition, the charge circuit is shunted and you're not charging ANYTHING.

Respecting these caveats will keep your battery in top shape, and YOU a happy camper!
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5.0 out of 5 starsWorks Great - We Are Using It on the Dash Behind the Sun Shades
By Mindi O. on July 27, 2014
Verified Purchase
We drive a truck over the road and are required to have a personal vehicle parked at our company HQ. When we go home we drive our truck home and use our other vehicle to get around. This causes us to leave our '98 Dodge Durango (parked in Georgia) for 3 - 6 weeks at a time without starting it. When we do we use it to go get something to eat and back to work so it does not get driven enough to give the batteries a good charge. We purchased this, along with the Schumacher SPC-7A 12 Volt Solar Charge Controller, after having to jump start our vehicle after leaving it for 8 weeks. We use thin window shades (with Fairies on them) and put the Solar Charger on the dash. It charges just fine even though it is not in direct sunlight. After being parked for 4 weeks, we put a multi-meter on the battery and it read 12.3 volts..started right up. Now we are thinking about buying another one for our Car in Florida! Hope this helps.
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5.0 out of 5 starsHuge, and puts out the juice.
By Bradley 98 on December 28, 2012
Verified Purchase
This item works well and puts out quite a good amount of electricity even in non ideal lighting. You'll want the charge controller with this one if you intend to use it as a constant 12V battery trickle charger. I think this large one has the ability to overcharge, especially on very sunny days. The charge controller will prevent overcharge.
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2.0 out of 5 starsSolar battery charger performance
By B Kuler on April 26, 2013
Verified Purchase
This device did not provide a battery charge used with a Schumacher Solar charge controller. There is no real good way to test or check the unit for proper operation. A fully charged dual battery on a Silverado truck still discharged as before using this solar charger
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5.0 out of 5 starsMy husband LOVED this, as we got it for him for ...
By Beverly Huntington on June 27, 2015
Verified Purchase
My husband LOVED this, as we got it for him for fathers day. Since he is an electrical engineer he was immediately testing it and said it had great output and quickly got a charge on it. Now he's figuring out MANY applications and uses he can develop with it in addition to his boat. I think I will have to get another now!
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5.0 out of 5 starsWorks as advertised
By CrnchyGrnla on May 20, 2013
Verified Purchase
Can't say more than that, it does what it is suppose to do and keeps the battery charged. No more worries about dead battery after long periods of storage. Wouldn't hesitate to recommend, but get the controller to avoid batter burn out.
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5.0 out of 5 starsI bought this Schumacher solar battery charger to keep my ...
By Joe on November 29, 2015
Verified Purchase
I bought this Schumacher solar battery charger to keep my F150 battery in top condition. I seldom drive the pickup, and have had to replace the original battery far too early, having run it 'dry' on several occasions. I'm expecting that the solar charger, used faithfully, will keep the battery in top charge and give longer working life. I've bought a number of Schumacher 'trickle' and 10 amp chargers over the years, and if they fil me it seems to be from abuse or neglect on my part rather than design failure. I hope for the same luck from this solar unit.
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5.0 out of 5 starsWorks perfectly with matching controller
By xgrep on April 3, 2014
Verified Purchase
I got the matching Schumacher charge controller to use with this solar panel to avoid possibly overcharging my car's battery. The two worked perfectly and kept the battery properly charged while I was away for several months. I actually didn't expect it to work - I expected to return to find a discharged or destroyed battery, so I was very surprised and pleased when that didn't happen. Isn't it crazy that it's come to this? That you celebrate when a product does only what it's supposed to do?
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Most Recent Customer Reviews

4.0 out of 5 starsLeaving it installed has been no issue and with short ...

Leaving it installed has been no issue and with short distance urban driving the battery never has a problem.

Published 20 days ago by Dark one
5.0 out of 5 starsFive Stars

use to maintain camper battery

Published 2 months ago by Rebecca L. Todd
5.0 out of 5 starsGreat product.

No issues and as described... Great product.

Published 3 months ago by nbiron
5.0 out of 5 starsSuper quick charger

My husband used it for his vortex duck thing for hunting. It charged the battery up so quick. He really was impressed with it.

Published 4 months ago by Kimberley Krausch
5.0 out of 5 starsI have these on two different boats with regulators. ...

I have these on two different boats with regulators. One boat is electric start, one is bilge pump only. Batteries seem to stay charged, have used for one season with no issues.

Published 5 months ago by Pat
4.0 out of 5 starsThis product met my expectations except instructions suggest product...

This product met my expectations except instructions suggest product not be left inside of vehicle which is where I want it.

Published 5 months ago by Theodore Williams
5.0 out of 5 starsWorking like a Charm

Only have a couple days experience but works fine as expected. Using the Schumacher SPC-7A Solar Charger Controller which also is working as expected.

Published 5 months ago by Eric R. Wong
3.0 out of 5 starsCheck the size before buying

Unable to use it but unable to return it. It is too large for the use I needed it for but no returns.

Published 6 months ago by Farm Girl
5.0 out of 5 stars... charging a vehicle that doesn't get driven very often easy and...

This project makes charging a vehicle that doesn't get driven very often easy and foolproof.

Published 7 months ago by J. T. Hanson
3.0 out of 5 starsThree Stars

Dont work

Published 8 months ago by guillermo ochoa

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