Buying guide · 10 min read · Updated October 2, 2026

6 Best Deck Mount RV Converter in 2026: A Practical RV Guide

Best deck mount RV converters compared by amp rating, 9800 series fit, AC draw and lithium charging, with real price gaps from $59 to $175.

By Bowen HigginsRV Editor at RV Gear Lab6 products comparedSpec-sheet researched

At a glance

Our top picks

At a glance · 6 picks

01
Best Overall 𝟐𝟎𝟐𝟔 𝐔𝐩𝐠𝐫𝐚𝐝𝐞 WF-9855 55 Amp Power Converter ↓ See why we picked it
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02
Best Budget WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series ↓ See why we picked it
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03
Best for Large Banks PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter ↓ See why we picked it
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04
Best 75A Middle Step 9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series ↓ See why we picked it
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05
Pricey 55A Option 9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series ↓ See why we picked it
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06
Only Lithium Wording 9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series ↓ See why we picked it
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Deck mount means the converter sits on a shelf beside the fuse panel, usually replacing a WFCO WF-9800 series unit, so the footprint and wiring have to match before the amp rating even matters. All six picks here are written as 9800 series replacements, from a 45A unit at $99 up to a 100A unit at $175.

The gap most buyers miss is what the converter leaves for the battery. A 55A converter feeds lights, fans and the water pump first, so charge current is the rating minus your house loads. Only one listing here names lithium and none gives a full charge voltage chart, so treat lithium claims as unverified until the manual says otherwise.

RV Gear Lab field notes

The Rig Fit Check

Start with the job: 𝟐𝟎𝟐𝟔 𝐔𝐩𝐠𝐫𝐚𝐝𝐞 WF-9855 55 Amp Power Converter leads this shortlist for Like for like 55A replacements. Use that fit as a reference point, then compare the alternatives against your own space and workload.
Specs that separate the picks: The first details to compare are 55A output, 13.6VDC, 55A deck mount, 100A output. Confirm the exact model and included components before ordering.
Trade-off to plan for: No lithium charge profile is listed

Before you buy

What Matters Before You Choose a Deck Mount RV Converter

Key buying criteria so you get the right fit the first time.

01
Rated amps versus battery charge
The amp rating is the converter's total DC output, shared with lights, fans and the water pump. A 55A converter feeding 15A of house loads leaves about 40A for the battery. Subtract your normal loads from the rating and compare what is left to the battery's recommended charge current.
02
Charge voltage stages
Three stage charging means bulk, absorption and float voltages. Xmnbl lists 13.6VDC and PowerMax lists 13.6 to 14.4Vdc, but the sixcow and GYHMK listings leave the figures out. A lead acid bank is fine with 13.6V, but LiFePO4 wants roughly 14.2 to 14.6V for absorption, so look for a written voltage table.
03
Lithium mode and float return
A lithium profile holds absorption briefly and then drops to a lower float, while some converters keep pushing absorption for hours. OMMFARL claims lithium compatibility but gives no voltage figure. Ask the seller for the charge stages in writing, or look for the manual PDF.
04
AC input draw
A converter pulls current from your shore circuit. The sixcow lists 11A at 120V for a 55A output, which scales to roughly 20A for a 100A unit like the PowerMax, though that figure is not listed. Add the converter's draw to the air conditioner and microwave before you judge your breaker size.
05
Footprint and wiring match
Deck mount converters bolt to a shelf with a fixed hole pattern and DC terminals. All six listings claim 9800 series fit, but you should read the model on your old unit, such as 9845, 9855 or 9875. Match the amps and the connector layout before ordering, and photograph your wiring first.
06
Warranty and cooling
Fan noise and heat decide how long a converter lives. The sixcow says its fan runs only when needed and the PowerMax lists a temperature controlled fan, while only the Xmnbl writes down a 5 year warranty. Prefer a written warranty and mount the unit where its fan can pull air.

Our standards

Why You Can Trust RV Gear Lab

At RV Gear Lab, we compare products based on rig fit and power or hookup compatibility, verified specifications, usability, setup requirements, weight, durability, and real-world trade-offs. We do not rank products purely on marketing claims or commission rates.

We have not personally tested every product listed. Where hands-on testing is not available, recommendations are based on verified manufacturer specifications, product documentation, use-case fit, and comparative research.

How we review RV gear →

Detailed reviews

The 6 best deck mount rv converter, explained

Best Overall · 1 of 6

𝟐𝟎𝟐𝟔 𝐔𝐩𝐠𝐫𝐚𝐝𝐞 WF-9855 55 Amp Power Converter

55A output, 13.6VDC
950W, 105-130 VAC input
5 year warranty

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Best for: Like for like 55A replacements

Our take

Pick this if you are replacing a failed 55A WF-9855 and want the lowest risk on price.

Why it made the shortlist

The Xmnbl WF-9855 is a 55A converter with a stated 13.6VDC output, 105 to 130 VAC input and 950 watts of power. The seller lists a 5 year warranty and says it replaces WF-9855 variants and 9800 series units, including the WF-9855-MBA and WF-9855AN, with a silent fan in the latest revision.

Against the $109 GYHMK 9855-AD it is $49.01 cheaper for the same 55A rating, which is why it tops this list.

What works

Output stated as 55A at 13.6VDC
5 year warranty listed by the seller
Replaces WF-9855 variants like MBA and AN

Watch out for

No lithium charge profile is listed
Fixed 13.6V output may undercharge lithium

Check price on Amazon

Best Budget · 2 of 6

WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series

55A deck mount
Fits WF-9800 series
Fan runs only when needed

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Best for: Cheapest 55A swap

Our take

Pick this if you want the lowest price for a 55A swap and a fan that stays off at idle.

Why it made the shortlist

The sixcow WF-9855 is a 55A deck mount converter with a 120V AC input at 11A, listed to replace any WF-9800 series unit including IOTA-DLS-55 and Atwood ACO-32 models.

At $58.99 it is the cheapest pick in the guide, $1.00 below Xmnbl, which has the same 55A rating.

What works

Fan runs only when needed, so quieter idle
Lists 11A AC input for sizing a circuit
Replaces IOTA-DLS-55 and Atwood ACO-32 models

Watch out for

Warranty length is not stated
Three stage voltages not clearly given

Check price on Amazon

Best for Large Banks · 3 of 6

PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter

100A output
13.6 to 14.4 VDC
Temperature-controlled fan

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Best for: Big banks and heavy DC loads

Our take

Pick this if you have a big lithium or multi battery bank and want a 14.4V top of range plus a safety certification on the listing.

Why it made the shortlist

The PowerMax PM3-100LK delivers 100A with an output window of 13.6 to 14.4Vdc, UL and CUL certification, reverse battery protection and a temperature controlled fan. It is listed as a replacement for the WF-9800 series and as compatible with the WFCO WF-9855, so it drops into the same space.

It is the most expensive pick at $175, $16 above the GYHMK 9875-AD at $159 for 25A more output.

What works

100A output suits large battery banks
13.6 to 14.4Vdc range reaches a fuller charge
UL and CUL certification is listed
Built in reverse battery protection saves wiring mistakes

Watch out for

AC input draw and size are not listed
Costs $115.01 more than a 55A unit

The catch: Against a 55A unit like Xmnbl at $59.99 you pay $115.01 extra, which is only worth it with a large bank, an inverter charging load or heavy DC loads that eat into a smaller unit's output.

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Best 75A Middle Step · 4 of 6

9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series

75A deck mount
Fits 9800 series
Electronic current limiter

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Best for: Mid sized banks needing more than 55A

Our take

The strongest case for 9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series is 75A output, a middle step up from 55A.

Why it made the shortlist

The GYHMK 9875-AD is a 75A deck mount converter written to replace 9800 series units, with three stage automatic charging and an electronic current limiter that shuts off on overload or short circuit. The listing also says it gives clean power with no interference to TV, radio or other signals.

It sits $16 below the PowerMax at $159 and $50 above the GYHMK 9855-AD at $109, so you buy 20 extra amps for $50, which is $2.50 per amp. That is a fair jump if your battery bank is 200Ah or more and your 55A unit is feeding the house loads first.

What works

75A output, a middle step up from 55A
Electronic current limiter guards against overload
Three stage automatic charging protects battery life
Listing says no TV or radio interference

Watch out for

Voltage stages and warranty are not listed
Costs $50 more than the GYHMK 55A

The catch: The caveat: the listing gives no output voltage figures and no warranty length, so you cannot see the charge profile or the terms before buying, and the AC draw is not stated either.

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Pricey 55A Option · 5 of 6

9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series

55A deck mount
Fits 9800 series
Electronic current limiter

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Best for: Buyers staying with the GYHMK line

Our take

9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series is the better fit when buyers staying with the GYHMK line.

Why it made the shortlist

The GYHMK 9855-AD is a 55A deck mount replacement for the 9800 series, with the same three stage automatic charging and electronic current limiting as its 75A sibling. The listing claims clean power with no interference to TV or radio signals and describes it as a way to avoid replacing the entire power center.

At $109 it is $49.01 above Xmnbl and $50.01 above sixcow for the same 55A rating, and $10 above the OMMFARL 9845-AD at $99 for 10A more.

What works

Electronic current limiter shuts off on shorts
Three stage charging maintains battery life
Written as a 9800 series drop in

Watch out for

Costs $49.01 more than Xmnbl for the same amps
No voltages or warranty length listed

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Only Lithium Wording · 6 of 6

9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series

45A three-stage charging
105-130 VAC, 60 Hz
Lead-acid and lithium

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Best for: Small banks wanting lithium wording

Our take

Pick this if you have a small bank, light loads and want the one listing that names lithium compatibility.

Why it made the shortlist

The OMMFARL 9845-AD is a 45A deck mount converter with three stage charging and 105 to 130 VAC input at 60 Hz.

What works

Listing names lithium and lead acid compatibility
Three stage charging for automatic maintenance
Input range of 105 to 130 VAC at 60 Hz

Watch out for

Only 45A, the smallest output here
Lithium claim has no voltage data
Costs $39.01 more than Xmnbl for less output

Check price on Amazon

Methodology

How We Built This Shortlist

Each pick was assessed across 4 criteria weighted for real-world use.

Amp rating after house loads

We compared rated output to the amps left for the battery once lights, fans and the pump are running.

Charge profile

We looked for written voltage stages and any lithium mode, and marked missing figures as not listed.

Footprint and fit

We checked each listing for 9800 series replacement wording and named model compatibility.

Price per amp

Gaps between picks are calculated from the listed prices and compared per amp of output.

Decision guide

Match a Deck Mount RV Converter to Your RV

By Battery Bank Size

Your situation	Recommended pick	Why
Up to about 100Ah of lead acid	Xmnbl WF-9855	55A covers a small bank plus house loads for $59.99
100Ah to 200Ah with light house loads	sixcow WF-9855	Same 55A at $58.99 with a fan that runs only when needed
200Ah to 300Ah bank	GYHMK 9875-AD	75A at $159, $50 above the 55A GYHMK
300Ah plus or inverter charging	PowerMax PM3-100LK	100A with a 14.4V top of range
Tiny bank, want lithium wording	OMMFARL 9845-AD	45A at $99 with the only lithium claim

By Budget

Budget	Recommended pick
$50 to $60	sixcow WF-9855 or Xmnbl WF-9855
$90 to $110	OMMFARL 9845-AD or GYHMK 9855-AD
$150 to $180	GYHMK 9875-AD or PowerMax PM3-100LK

Lead Acid Profile vs Lithium Capable

Lead acid profile

Fixed 13.6V output from the Xmnbl WF-9855 and three stage charging on the sixcow WF-9855, GYHMK 9855-AD and GYHMK 9875-AD suit AGM and flooded batteries and keep the price low.

Lithium capable

PowerMax PM3-100LK lists a 13.6 to 14.4Vdc range and OMMFARL 9845-AD names lithium, but neither documents a full lithium profile or a return to float.

If you run lithium, buy a converter with a written lithium profile or add a separate charger rather than trusting any of these claims.

By Replacement Situation

Your old unit	Recommended pick
Replacing a failed WF-9855	Xmnbl WF-9855
Replacing a 9875 or upgrading from 55A	GYHMK 9875-AD
Replacing a WF-9845	OMMFARL 9845-AD
Moving up to a 100A class unit	PowerMax PM3-100LK

For Lithium Upgrades Specifically

Look for

A written charge profile showing absorption near 14.4V and a lithium mode that does not drop to float prematurely.

In this comparison

PowerMax PM3-100LK lists a 13.6 to 14.4Vdc range, the closest to that, while OMMFARL 9845-AD names lithium but gives no voltage. Ask for the manual before buying either.

When to Spend More

Spend more if

Spend more on PowerMax PM3-100LK at $175 if your bank exceeds 200Ah or your lithium needs 14.4V, since it adds 45A over Xmnbl WF-9855 for $115.01.

Save if

Save with Xmnbl WF-9855 or sixcow WF-9855 at about $59, because a 55A converter covers most 30A trailers on lead acid.

FAQ

Before You Bring One Home

Can I replace a 45A converter with a 55A?

Usually yes, if the footprint matches and your DC wire gauge and fuse support the higher current. Check both before upgrading. The Xmnbl WF-9855 at $59.99 is the cheapest step up from the OMMFARL 9845-AD's 45A at $99.

Will a deck mount converter charge lithium properly?

Only if its charge voltage reaches the lithium absorption range. PowerMax lists up to 14.4Vdc and OMMFARL claims lithium compatibility, but none of these listings publishes a full lithium profile with a return to float.

Is a 75A or 100A converter worth the extra money?

Only for large banks. Moving from the 55A Xmnbl at $59.99 to the GYHMK 9875-AD at $159 adds 20A for $99.01, and the PowerMax at $175 adds 45A for $115.01. For a small bank the extra amps sit unused.

How do I install a deck mount converter?

Turn off shore power and disconnect the battery, mount the unit to the shelf, then connect the DC leads with the correct polarity and the AC input to the converter circuit. PowerMax lists reverse battery protection, but check polarity regardless.

How do I know my converter is failing?

The listings do not give a lifespan, so watch for battery voltage under about 13V on shore power, a fan that never runs or never stops, or flickering lights. Measure the battery voltage with a multimeter at the terminals.

Bottom line

The short version

Browse more deck mount rv converter on Amazon →

About the author

Bowen Higgins

RV Editor at RV Gear Lab

Bowen covers RV power, water systems, towing and leveling, upkeep and interior comfort, with a focus on matching gear to the rig, the hookups and the way you actually travel.

6 Best Deck Mount RV Converter in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose a Deck Mount RV Converter

Rated amps versus battery charge

Charge voltage stages

Lithium mode and float return

AC input draw

Footprint and wiring match

Warranty and cooling

Why You Can Trust RV Gear Lab

The 6 best deck mount rv converter, explained

How We Built This Shortlist

Amp rating after house loads

Charge profile

Footprint and fit

Price per amp

Match a Deck Mount RV Converter to Your RV

By Battery Bank Size

By Budget

Lead Acid Profile vs Lithium Capable

By Replacement Situation

For Lithium Upgrades Specifically

When to Spend More

Before You Bring One Home

Can I replace a 45A converter with a 55A?

Will a deck mount converter charge lithium properly?

Is a 75A or 100A converter worth the extra money?

How do I install a deck mount converter?

How do I know my converter is failing?

The short version

Bowen Higgins

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