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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
- 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.
- 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.
- 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).
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
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
- 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.
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
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Purchase options and add-ons
| Brand | PowerMax |
| Color | Metallic |
| Item Weight | 6.69 Pounds |
| Input Voltage | 110 Volts |
| Item dimensions L x W x H | 10 x 7 x 4 inches |
About this item
- replacement for wfco wf-9855 motor home wf9855
- Lithium Compatible
Additional Details
Frequently bought together

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Product description
Key Benefits
It caters to all your power needs, whether on the road in your RV or using your car's audio system.
Connect your car to the charger and enjoy your favorite tunes hassle-free.
It reduces output to safe levels if temperatures exceed preset limits.
PowerMax is designed for easy installation and can be set up in 10 minutes.
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| Customer Reviews |
4.5 out of 5 stars 353
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4.6 out of 5 stars 659
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4.6 out of 5 stars 659
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| Price | $110.00$110.00 | — no data | $125.00$125.00 | $125.00$125.00 | — no data |
| Inverter | ✓ | ✓ | ✓ | ✓ | ✓ |
| Converter | ✓ | ✓ | ✓ | ✓ | ✓ |
| Battery Chargers | ✓ | ✓ | ✓ | ✓ | ✓ |
| AC & DC Power Distribution Center | ✓ | ✓ | ✓ | ✓ | ✓ |
| Automatic Transfer Switches | ✓ | ✓ | ✓ | ✓ | ✓ |
| Generators | ✓ | ✓ | ✓ | ✓ | ✓ |
| Water Pumps | ✓ | ✓ | ✓ | ✓ | ✓ |
Product information
| Input Voltage | 110 Volts |
|---|---|
| Output Voltage | 12 Volts |
| Plug Type | Type B |
| Power Source | Battery Powered |
| Item Weight | 6.69 Pounds |
|---|---|
| Item Dimensions | 10 x 7 x 4 inches |
| Color | Metallic |
|---|
Warranty & Support
Feedback
| Brand | PowerMax |
|---|---|
| Model Number | PM3-55LK |
| UPC | 701236795660 685867998044 |
| Mfr Part Number | PM3-55LK |
| Manufacturer | PowerMax Converter |
| Warranty Description | 2 Year Warranty |
| Unit Count | 1.0 Count |
| Best Sellers Rank |
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| ASIN | B01N4KZV3P |
| Customer Reviews |
4.6 out of 5 stars |
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Generated from the text of customer reviewsSelect to learn more
Top reviews from the United States
- 5 out of 5 stars
Great choice
Reviewed in the United States on July 27, 2025I 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
It works
Reviewed in the United States on October 31, 2025Works perfectly
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Exactly What I Needed
Reviewed in the United States on March 5, 2022A 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Works as it should.
Reviewed in the United States on January 29, 2024Shipped 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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 4 out of 5 stars
Great for converting to lithium
Reviewed in the United States on March 25, 2026Replaced 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...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Works great!
Reviewed in the United States on August 8, 2025Works great!
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Easy to install.
Reviewed in the United States on September 24, 2024Easy to install. Has a nice lil green light to let you know she's running. No issues charging 🤙
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Great converter.
Reviewed in the United States on April 14, 2024Called 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.
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Top reviews from other countries
michel1 out of 5 starsnot the best
Reviewed in Canada on January 11, 2023Does 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.
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Nicolas a.5 out of 5 starsComprovado.
Reviewed in Mexico on March 3, 2023Exelente producto cumplio mis espectativas.
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Product summary presents key product information
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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
About this Item
- replacement for wfco wf-9855 motor home wf9855
- Lithium Compatible
Product Description
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