Sponsored

Add to your order

  • Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary)
  • 24/7 support when you need it
  • Quick, easy, and frustration-free claims
Cover this product:
2-Year Protection Plan $16.99
3-Year Protection Plan $23.99
Cover all of your eligible devices:
Complete Protect: One plan covers all eligible past and future purchases (Best Value) $16.99/month

Add to your order

  • Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary)
  • 24/7 support when you need it
  • Quick, easy, and frustration-free claims
Cover this product:

Product Protection by Asurion, LLC

  • No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
  • Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
  • Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
  • Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.

Product Protection by Asurion, LLC

  • No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
  • Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
  • Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
  • Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.

Product Protection by Asurion, LLC

  • BEST VALUE: Protect all your eligible Amazon purchases including: tech, tools, appliances, furniture and more. All for one low monthly price.
  • PAST AND FUTURE PROTECTION: Covers malfunctions and failures, plus drops or spills for eligible portable items. Protection begins immediately for eligible purchases from the past 90 days, plus all eligible future purchases (products used commercially are excluded).
  • TRUSTED CYBERSECURITY: Digital security with scam detection for emails and texts.
  • EASY CLAIMS: File in minutes at www.asurion.com/amazon for fast repair or reimbursement - up to the purchase price.
  • NO HIDDEN FEES. CANCEL ANYTIME: Up to $5,000 in total claims per 12-month period. Your plan renews monthly until canceled (coupons applied at checkout don’t renew monthly).

Product Protection by Asurion, LLC

Please ensure you are not covered by existing insurance
  • No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
  • Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
  • Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
  • Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.
Cover this product:
2-Year Protection Plan
$16.99
3-Year Protection Plan
$23.99
Complete Protect: One plan covers all eligible past and future purchases (Best Value)
$16.99/month
Enjoy fast, free delivery, exclusive deals, and award-winning movies & TV shows.
$133.00
FREE delivery Sunday, June 14
Or Prime members get FREE delivery Tomorrow, June 10. Join Prime
Arrives 11 days before Father's Day
In Stock
$$133.00 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$133.00
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from
Amazon
Amazon
Ships from
Amazon
Returns
FREE 30-day refund/replacement
FREE 30-day refund/replacement
Quick refund
Usually issued within 24 hours. See exceptions
FREE return
At least one free return option available.
Convenient dropoff
At any of our 50,000 US locations.
See return policy
Gift options
Available at checkout
Available at checkout This item is a gift. Change
At checkout, you can add a custom message, a gift receipt for easy returns and have the item gift-wrapped
Packaging
Ships in product packaging
black leaf Ships in product packaging

This item has been tested to certify it can ship safely in its original box or bag to avoid unnecessary packaging. Since 2015, we have reduced the weight of outbound packaging per shipment by 41% on average, that’s over 2 million tons of packaging material.

If you still require Amazon packaging for this item, choose "Ship in Amazon packaging" at checkout. Learn more
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Include
Add a protection plan:
Sorry, your monthly warranty plan was removed because these plans are currently only available for single-item orders.
Add to your order

2-Year Electronics Protection Plan

from Asurion, LLC
$16.99
  • No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
  • Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
  • Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
  • Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.

3-Year Electronics Protection Plan

from Asurion, LLC
$23.99
  • No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
  • Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
  • Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
  • Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.

Complete Protect: One simple plan covers all eligible past & future Amazon Purchases

from Asurion, LLC
$16.99/month
  • BEST VALUE: Protect all your eligible Amazon purchases including: tech, tools, appliances, furniture and more. All for one low monthly price.
  • PAST AND FUTURE PROTECTION: Covers malfunctions and failures, plus drops or spills for eligible portable items. Protection begins immediately for eligible purchases from the past 90 days, plus all eligible future purchases (products used commercially are excluded).
  • TRUSTED CYBERSECURITY: Digital security with scam detection for emails and texts.
  • EASY CLAIMS: File in minutes at www.asurion.com/amazon for fast repair or reimbursement - up to the purchase price.
  • NO HIDDEN FEES. CANCEL ANYTIME: Up to $5,000 in total claims per 12-month period. Your plan renews monthly until canceled (coupons applied at checkout don’t renew monthly).
Added to

Sorry, there was a problem.

There was an error retrieving your Wish Lists. Please try again.

Sorry, there was a problem.

List unavailable.
  • VIDEO
  • Powermax RV Converter | 55 Amp | 12V Power Converter with Built-in 4 Stage Smart Battery Charger | 110V AC to 12V | Lithium Compatible | Fully Adjustable Output from 13V to 16.5V | PM3 55LK
  • Key Features of the PowerMax PM3 SeriesOceanside RV Supply

Powermax RV Converter | 55 Amp | 12V Power Converter with Built-in 4 Stage Smart Battery Charger | 110V AC to 12V | Lithium Compatible | Fully Adjustable Output from 13V to 16.5V | PM3 55LK

4.6 out of 5 stars (233)

$133.00
Get $10 off instantly: Pay $123.00 $133.00 upon approval for the Amazon Store Card. No annual fee.
FREE Returns
Available at a lower price from other sellers that may not offer free Prime shipping.
{"desktop_buybox_group_1":[{"displayPrice":"$133.00","priceAmount":133.00,"currencySymbol":"$","integerValue":"133","decimalSeparator":".","fractionalValue":"00","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"MFxa99mLnPNeVgunE4BlYcQ4ZYaj9gZsxqJr4WhkoEWIoONEO32TUizNi%2BNjENfGQ6LMCdSR5dNv8EurehcvOU31OLdpj%2BiENukFEcnaUtqSoG5X5zaI4FPs6xCZ%2FIkIdFjtrkRebAa4jtNepSOo9EVa9wQrDcHthqpsksSV8fLHxZ6w5BAifBqf7S5XSeuB","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}]}

Purchase options and add-ons

About this item

  • replacement for wfco wf-9855 motor home wf9855
  • Lithium Compatible

Additional Details

Small Business
Shop products from small business brands sold in Amazon’s store. Discover more about the small businesses partnering with Amazon and Amazon’s commitment to empowering them.

Small Business
This product is from a small business brand. Support small. Learn more

Frequently bought together

This item: Powermax RV Converter | 55 Amp | 12V Power Converter with Built-in 4 Stage Smart Battery Charger | 110V AC to 12V | Lithium Compatible | Fully Adjustable Output from 13V to 16.5V | PM3 55LK
$133.00
Get it as soon as Sunday, Jun 14
In Stock
Sold by Oceanside RV Supply and ships from Amazon Fulfillment.
Total price: $00
To see our price, add these items to your cart.
Details
Added to Cart
These items are shipped from and sold by different sellers.
Choose items to buy together.

Product description

auto forest river switch disconnect keystone compatible audio electric current electrical monitor

Key Benefits

charge generator series wheels accessories lantern travel powered wizard model mount controller cord

It caters to all your power needs, whether on the road in your RV or using your car's audio system.

deck radio lead acid international unit stereo shield global black household clip spinner converted

Connect your car to the charger and enjoy your favorite tunes hassle-free.

conjunto batería reclinable automotriz largo cargador resistencia preventiva calentador diésel toma

It reduces output to safe levels if temperatures exceed preset limits.

transformador adaptador voltaje convertidor litio baterías autocaravana montaje modelo asistente

PowerMax is designed for easy installation and can be set up in 10 minutes.

potencia unidad internacional plomo-ácido protector estéreo Repartición guerreros consumidor grúa
duradera convertido en un dispositivo activo  polaridad estática pirámide hierro pluma
Asignación bombas aire autocaravanas distribución Provisión guerrero junta campamento vivienda
PM3 SERIES
PM3 SERIES
PM3 SERIES
PM3 SERIES
PM3 SERIES
Customer Reviews
4.5 out of 5 stars 353
4.6 out of 5 stars 659
4.6 out of 5 stars 659
Price $110.00 no data $125.00 $125.00 no data
Inverter
Converter
Battery Chargers
AC & DC Power Distribution Center
Automatic Transfer Switches
Generators
Water Pumps

Product information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

Feedback

Powermax RV Converter | 55 Amp | 12V Power Converter with Built-in 4 Stage Smart Battery Charger | 110V AC to 12V | Lithium Compatible | Fully Adjustable Output from 13V to 16.5V | PM3 55LK


Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?

Price Availability
/
/
/
/
Please sign in to provide feedback.

From the brand

Sponsored

Customer reviews

4.6 out of 5 stars
233 global ratings
Sponsored

Customers say

Customers find the power converter works well and is easy to install. They praise its quality, with one customer noting its adjustable output settings from 13V to 16.5V. The device receives mixed feedback regarding noise level, with several customers describing it as loud.
AI Generated from the text of customer reviews

Select to learn more

26 customers mention functionality, 24 positive, 2 negative
Customers find that the power converter works well, with one customer noting that the fan operates as needed, and another mentioning that it shows system status through a pendant display.
Quick and easy to use charger, use it for multi cars in a body shop. works great.Read more
Works perfectlyRead more
...Had for over a year now, no issues, words great. Only downside is it is a little loud....Read more
So far works as described. Easy to installRead more
7 customers mention quality, 7 positive, 0 negative
Customers find the power converter to be of great quality.
Good itemRead more
Amazing productRead more
...Checked all the batteries and checked out good. No idea what caused it to blow out....Read more
Great converter.Read more
6 customers mention installation, 6 positive, 0 negative
Customers find the power converter easy to install.
Easy to install. Has a nice lil green light to let you know she's running. No issues charging 🤙Read more
Works as designed. Easy install. Love the green indicator light which shows it is working.Read more
I use this unit as a solar charger for a backup system. It installs easily and it has a very high build quality....Read more
Shipped fast. Packaged well. Seems well built. Easy to install....Read more
8 customers mention noise level, 1 positive, 7 negative
Customers report that the power converter is loud.
...Seems well built. Easy to install. The fan is a little loud but where it is located in our 5th wheel it's not an issue.Read more
Two RV -Bought TWO. One mounted in the living room. The fan is so loud I had to unplug it....Read more
This unit works fine but is very noisy. Too late to send back, but I would iff I could. It will keep you awake at night when it turns on.Read more
...Only downside is it is a little loud....Read more

Top reviews from the United States

  • 5 out of 5 stars
    Great choice
    Reviewed in the United States on July 27, 2025
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    I changed my 5th wheel rv camper to lithium and needed to change the charge controller and inverter as well, went with a cheaper one at first and had problems with it.. i returned it and bought this power max and i love it, does a great job keeping my 280 amp hour battery topped off. And i love the pendant that shows me what its doing. I highly recommend this!!

    2 people found this helpful
    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    It works
    Reviewed in the United States on October 31, 2025
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Works perfectly

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Exactly What I Needed
    Reviewed in the United States on March 5, 2022
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    A lot of reviews mention how loud it is. Well, it is certainly louder than the original one. However, to replace the original one it would be at least double the price. We call that a "push". Ease of install will vary depending on your rig. For mine I needed to get another piece of ground wire as the lug is in a different location the the original one. That said, if you think you will ever need to adjust the voltage be mindful on where those switches are when you install it. Otherwise, it works well.

    One person found this helpful
    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Works as it should.
    Reviewed in the United States on January 29, 2024
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Shipped fast.

    Packaged well.

    Seems well built.

    Easy to install.

    The fan is a little loud but where it is located in our 5th wheel it's not an issue.

    3 people found this helpful
    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 4 out of 5 stars
    Great for converting to lithium
    Reviewed in the United States on March 25, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Replaced the existing converter when I converted my 2002 motorhome to Lithium batteries. Had for over a year now, no issues, words great. Only downside is it is a little loud. Not too bad but if it's mounted inside your motorhome, mine is under the stove/oven, you will hear the fan when it runs. Still much quieter than the one it replaced.

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Works great!
    Reviewed in the United States on August 8, 2025
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Works great!

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Easy to install.
    Reviewed in the United States on September 24, 2024
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Easy to install. Has a nice lil green light to let you know she's running. No issues charging 🤙

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Great converter.
    Reviewed in the United States on April 14, 2024
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Called Powermaxx to get a recommendation on replacement unit for Parrellox 7444. They called me back quickly and advised me on what to get. This one went in easy and seems to be working great.

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.

Top reviews from other countries

    Translated by Amazon
    See original
  • 1 out of 5 stars
    not the best
    Reviewed in Canada on January 11, 2023
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Does not what is supposed to do.

    I bought a 45 amps but it only charge at 20 amps maximum !

    I should have bought a brand with a good after sale service who would respond to my questions.

    Do yourself a favor and buy another brand.

    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Comprovado.
    Reviewed in Mexico on March 3, 2023
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Exelente producto cumplio mis espectativas.

    Sending feedback...
    Thanks, we'll investigate in the next few days.
    Translated from Spanish by Amazon
    See original
Sponsored

Product Summary: Powermax RV Converter | 55 Amp | 12V Power Converter with Built-in 4 Stage Smart Battery Charger | 110V AC to 12V | Lithium Compatible | Fully Adjustable Output from 13V to 16.5V | PM3 55LK

From PowerMax

4.6 out of 5 stars, 233 ratings

Customer reviews

50+ bought in past month

About this Item

  • replacement for wfco wf-9855 motor home wf9855
  • Lithium Compatible

Product Description

Powermax PM3-55LK 55 Amp 12 Volt Power Supply (Replacement for WFCO WF-9855) Battery Charger with 3 Stage Smart Charging Mode, Built-in Cooling Fan and LED Indicator Light, Lithium Compatible

Feedback

Did you find this product summary feature useful?

Thank you for your feedback
Thank you for your feedback. You selected "Yes, it is useful"
Thank you for your feedback. You selected "No, it is not useful"
Product summary presents key information. Close to see all product details.