Buying Guide
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 Hardcastle's RV Editors
10 min read6 products evaluated
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.
Hardcastleβs RV field notes
The Rig Fit Check
A quick way to connect the shortlist to the space, workload and ownership details that matter after the box arrives.
- Start with the job
- ππππ ππ©π π«πππ 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
The Practical Shortlist
A road-tested-thinking look at 6 options, organized around the job each one suits best.
Best Overall
ππππ ππ©π π«πππ WF-9855 55 Amp Power Converter
Like for like 55A replacements
Our take Check price for ππππ ππ©π π«πππ WF-9855 55 Amp Power Converter (opens in a new tab)
Best Budget
WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series
Cheapest 55A swap
Our take Check price for WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series (opens in a new tab)
Best for Large Banks
PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter
Big banks and heavy DC loads
Our take Check price for PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter (opens in a new tab)
Best 75A Middle Step
9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series
Mid sized banks needing more than 55A
Our take Check price for 9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series (opens in a new tab)
Pricey 55A Option
9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series
Buyers staying with the GYHMK line
Our take Check price for 9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series (opens in a new tab)
Only Lithium Wording
9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series
Small banks wanting lithium wording
Our take Check price for 9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series (opens in a new tab)
Why Each Pick Made the Cut
Best Overall1 of 6
ππππ ππ©π π«πππ WF-9855 55 Amp Power Converter on Amazon (opens in a new tab)
ππππ ππ©π π«πππ WF-9855 55 Amp Power Converter is the better fit when like for like 55A replacements.
Best for
- Like for like 55A replacements
Why it made the shortlist
The intended use case is Like for like 55A replacements. The documented setup centers on 55A output, 13.6VDC, 950W, 105-130 VAC input, 5 year warranty.
What separates it on paper is output stated as 55A at 13.6VDC. Against the other 5 picks, the useful comparison starts with 55A output, 13.6VDC and 950W, 105-130 VAC input. Those details show whether its configuration suits the job better than a neighboring recommendation.
Before committing, account for no lithium charge profile is listed. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 55A output, 13.6VDC
- 950W, 105-130 VAC input
- 5 year warranty
Pros
- Output stated as 55A at 13.6VDC
- 5 year warranty listed by the seller
- Replaces WF-9855 variants like MBA and AN
Cons
- No lithium charge profile is listed
- Fixed 13.6V output may undercharge lithium
Best Budget2 of 6
WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series on Amazon (opens in a new tab)
Choose WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series for fan runs only when needed, so quieter idle.
Best for
- Cheapest 55A swap
Why it made the shortlist
WF-9855 55 Amp Deck Mount RV Power Converter/Charger Replacement for 9800 Series is positioned for Cheapest 55A swap. The documented setup centers on 55A deck mount, fits WF-9800 series, fan runs only when needed.
The feature doing most of the work here is fan runs only when needed, so quieter idle. Against the other 5 picks, the useful comparison starts with 55A deck mount and fits WF-9800 series. Those details show whether its configuration suits the job better than a neighboring recommendation.
The practical constraint here is warranty length is not stated in the listing. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 55A deck mount
- Fits WF-9800 series
- Fan runs only when needed
Pros
- 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
Cons
- Warranty length is not stated in the listing
- Three stage voltages not clearly given
Best for Large Banks3 of 6
PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter on Amazon (opens in a new tab)
PowerMax PM3-100LK 110V to 12V DV Power Supply Converter Charger for RV 100 Amp -Grade Voltage Converter makes the shortlist because 100A output suits large battery banks.
Best for
- Big banks and heavy DC loads
Why it made the shortlist
This model is aimed at Big banks and heavy DC loads. The documented setup centers on 100A output, 13.6 to 14.4 VDC, temperature-controlled fan.
The most useful documented advantage is 100A output suits large battery banks. Against the other 5 picks, the useful comparison starts with 100A output and 13.6 to 14.4 VDC. Those details show whether its configuration suits the job better than a neighboring recommendation.
The main limitation to plan around is aC input draw and size are not listed. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 100A output
- 13.6 to 14.4 VDC
- Temperature-controlled fan
Pros
- 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
Cons
- AC input draw and size are not listed
- Costs $115.01 more than a 55A unit
Best 75A Middle Step4 of 6
9875-AD 75 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series on Amazon (opens in a new tab)
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.
Best for
- Mid sized banks needing more than 55A
Why it made the shortlist
For Mid sized banks needing more than 55A, this is one of the more relevant configurations in the shortlist. The documented setup centers on 75A deck mount, fits 9800 series, electronic current limiter.
Its case starts with 75A output, a middle step up from 55A. Against the other 5 picks, the useful comparison starts with 75A deck mount and fits 9800 series. Those details show whether its configuration suits the job better than a neighboring recommendation.
The trade-off worth checking first is voltage stages and warranty are not listed. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 75A deck mount
- Fits 9800 series
- Electronic current limiter
Pros
- 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
Cons
- Voltage stages and warranty are not listed
- Costs $50 more than the GYHMK 55A
Pricey 55A Option5 of 6
9855-AD 55 Amp Deck Mount Power Converter/Charger Replacement for RV Trailer Camper 9800 Series on Amazon (opens in a new tab)
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.
Best for
- Buyers staying with the GYHMK line
Why it made the shortlist
The intended use case is Buyers staying with the GYHMK line. The documented setup centers on 55A deck mount, fits 9800 series, electronic current limiter.
What separates it on paper is electronic current limiter shuts off on shorts. Against the other 5 picks, the useful comparison starts with 55A deck mount and fits 9800 series. Those details show whether its configuration suits the job better than a neighboring recommendation.
Before committing, account for costs $49.01 more than Xmnbl for the same amps. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 55A deck mount
- Fits 9800 series
- Electronic current limiter
Pros
- Electronic current limiter shuts off on shorts
- Three stage charging maintains battery life
- Written as a 9800 series drop in
Cons
- Costs $49.01 more than Xmnbl for the same amps
- No voltages or warranty length listed
Only Lithium Wording6 of 6
9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series on Amazon (opens in a new tab)
Choose 9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series for listing names lithium and lead acid compatibility.
Best for
- Small banks wanting lithium wording
Why it made the shortlist
9845-AD Deck Mount Converter Replacement for RV Trailer Camper 9800 Series is positioned for Small banks wanting lithium wording. The documented setup centers on 45A three-stage charging, 105-130 VAC, 60 Hz, lead-acid and lithium.
The feature doing most of the work here is listing names lithium and lead acid compatibility. Against the other 5 picks, the useful comparison starts with 45A three-stage charging and 105-130 VAC, 60 Hz. Those details show whether its configuration suits the job better than a neighboring recommendation.
The practical constraint here is only 45A, the smallest output here. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 45A three-stage charging
- 105-130 VAC, 60 Hz
- Lead-acid and lithium
Pros
- Listing names lithium and lead acid compatibility
- Three stage charging for automatic maintenance
- Input range of 105 to 130 VAC at 60 Hz
Cons
- Only 45A, the smallest output here
- Lithium claim has no voltage data
- Costs $39.01 more than Xmnbl for less output
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.
What Matters Before You Choose a Deck Mount RV Converter
Key buying criteria so you get the right fit the first time.
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.
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.
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.
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.
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.
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.
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 |
Scroll sideways to see every column.
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.
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
Best overall: ππππ ππ©π π«πππ WF-9855 55 Amp Power Converter β best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all deck mount rv converter on Amazon β Prime-eligible options with current pricing.