Buying Guide
6 Best 35 Amp RV Converters in 2026: A Practical RV Guide
Six 35 amp RV converter chargers compared on charge stages, fixed voltage modes, lithium support and which factory sections they replace, from $61.90 to $319.
By Hardcastle's RV Editors
10 min read6 products evaluated
A 35 amp converter is the quiet middle of the RV market: big enough to run the pump, vent fans and lights while pushing real current into a single group 27 battery, and small enough to be passively cheap. It is also the size many older WFCO 8935 and Parallax 6336 sections were built to, so a lot of buyers are replacing a dead 35 amp part, not designing a new system. At 35 amps and roughly 13.6 volts the unit is moving close to 480 watts of DC, which is why fan behavior and fit matter more than the label.
We compared six 35 amp units priced from $61.90 to $319.45, looking at what each listing really commits to: the charge stages, whether lithium is handled, the fixed voltages, and the named factory sections they replace. The spread is wide for a reason. Two are legacy-brand sections that name exact replacements, three are aftermarket boxes with modern charge modes, and one is a power supply whose listing is mostly about electronics, not RV setup.
Hardcastle’s 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
- Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp leads this shortlist for like-for-like swaps in lead-acid RVs. 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 35A, Charge Wizard 4-stage, 35A regulated 12V output, 35A, 13.0/14.6/16.5V modes. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Costs $179 more than the PowerMax PM4-35A
The Practical Shortlist
A road-tested-thinking look at 6 options, organized around the job each one suits best.
Best Legacy Replacement
Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp
like-for-like swaps in lead-acid RVs
Our take Check price for Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp (opens in a new tab)
Best Lithium Value
PowerMax PM4-35A 35A Deck Mount RV Converter Charger Lithium
lithium upgrades from a recognized brand
Our take Check price for PowerMax PM4-35A 35A Deck Mount RV Converter Charger Lithium (opens in a new tab)
Best Fixed-Voltage Modes
RecPro 35 Amp RV Power Converter & Battery Charger, 4-Stage Charging
selectable voltage with an upgrade path
Our take Check price for RecPro 35 Amp RV Power Converter & Battery Charger, 4-Stage Charging (opens in a new tab)
Best Budget
VEVOR RV Power Converter, 35 Amp, 110V AC to 12V DC, 4 Stage Smart Charging, 13V to 16.5V
small batteries on a tight budget
Our take Check price for VEVOR RV Power Converter, 35 Amp, 110V AC to 12V DC, 4 Stage Smart Charging, 13V to 16.5V (opens in a new tab)
Best Fixed 13.75V Supply
Fortron/Source SRV Series FSV35-12A-4 RV Power Converter, 35 Amp, 4-Stage Charger
fixed-voltage lead-acid installs
Our take Check price for Fortron/Source SRV Series FSV35-12A-4 RV Power Converter, 35 Amp, 4-Stage Charger (opens in a new tab)
Best Parallax Swap
Parallax Power Supply 4435 4400 Series Deck Mount Converter, 35 Amp
exact replacement in a Parallax 4400 bay
Our take Check price for Parallax Power Supply 4435 4400 Series Deck Mount Converter, 35 Amp (opens in a new tab)
Why Each Pick Made the Cut
Best Legacy Replacement1 of 6
Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp on Amazon (opens in a new tab)
Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp is the better fit when like-for-like swaps in lead-acid RVs.
Best for
- like-for-like swaps in lead-acid RVs
Why it made the shortlist
The intended use case is like-for-like swaps in lead-acid RVs. The documented setup centers on 35A, Charge Wizard 4-stage, replaces WFCO 8935, replaces Parallax 6336.
What separates it on paper is names the exact WFCO and Parallax sections it replaces. Against the other 5 picks, the useful comparison starts with 35A, Charge Wizard 4-stage and replaces WFCO 8935. Those details show whether its configuration suits the job better than a neighboring recommendation.
Before committing, account for costs $179 more than the PowerMax PM4-35A. 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
- 35A, Charge Wizard 4-stage
- Replaces WFCO 8935
- Replaces Parallax 6336
Pros
- Names the exact WFCO and Parallax sections it replaces
- Four-stage charging aimed at preventing battery boil
- Designed to be simple to install in an old bay
- Established converter brand with no unknown seller name
Cons
- Costs $179 more than the PowerMax PM4-35A
- Listing mentions no lithium or adjustable voltage setting
Best Lithium Value2 of 6
PowerMax PM4-35A 35A Deck Mount RV Converter Charger Lithium on Amazon (opens in a new tab)
Choose PowerMax PM4-35A 35A Deck Mount RV Converter Charger Lithium for adjustable output supports a configured lithium bank.
Best for
- lithium upgrades from a recognized brand
Why it made the shortlist
PowerMax PM4-35A 35A Deck Mount RV Converter Charger Lithium is positioned for lithium upgrades from a recognized brand. The documented setup centers on 35A regulated 12V output, adjustable lithium output, deck-mount standalone box.
The feature doing most of the work here is adjustable output supports a configured lithium bank. Its 35A regulated 12V output specification sits at the lower end of the comparable range in this 4-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The practical constraint here is listing gives no numbered voltage steps or range. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 35A regulated 12V output
- Adjustable lithium output
- Deck-mount standalone box
Pros
- Adjustable output supports a configured lithium bank
- Costs $15.95 less than the RecPro 35 amp
- Lists current limit, reverse polarity and thermal protection
- Standalone deck-mount box sits near the battery bank
Cons
- Listing gives no numbered voltage steps or range
- No named factory sections it replaces are listed
Best Fixed-Voltage Modes3 of 6
RecPro 35 Amp RV Power Converter & Battery Charger, 4-Stage Charging on Amazon (opens in a new tab)
RecPro 35 Amp RV Power Converter & Battery Charger, 4-Stage Charging makes the shortlist because three fixed voltages let you match a lithium spec.
Best for
- selectable voltage with an upgrade path
Why it made the shortlist
This model is aimed at selectable voltage with an upgrade path. The documented setup centers on 35A, 13.0/14.6/16.5V modes, four named charge stages, sizes from 35A to 125A.
The most useful documented advantage is three fixed voltages let you match a lithium spec. Its 35A, 13.0/14.6/16.5V modes specification sits at the upper end of the comparable range in this 4-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The main limitation to plan around is costs $15.95 more than the PowerMax PM4-35A. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 35A, 13.0/14.6/16.5V modes
- Four named charge stages
- Sizes from 35A to 125A
Pros
- Three fixed voltages let you match a lithium spec
- Fan only runs when temperature requires it
- Same family scales from 35 up to 125 amps
- Can be wired in parallel for more output
Cons
- Costs $15.95 more than the PowerMax PM4-35A
- The 16.5 volt mode would damage a battery bank
Best Budget4 of 6
VEVOR RV Power Converter, 35 Amp, 110V AC to 12V DC, 4 Stage Smart Charging, 13V to 16.5V on Amazon (opens in a new tab)
The strongest case for VEVOR RV Power Converter, 35 Amp, 110V AC to 12V DC, 4 Stage Smart Charging, 13V to 16.5V is costs $52.10 less than the PowerMax PM4-35A.
Best for
- small batteries on a tight budget
Why it made the shortlist
For small batteries on a tight budget, this is one of the more relevant configurations in the shortlist. The documented setup centers on 35A, 13V to 16.5V range, lead-acid and LiFePO4 modes, copper cable included.
Its case starts with costs $52.10 less than the PowerMax PM4-35A. Its 35A, 13V to 16.5V range specification sits at between the lower and upper ends of the comparable range in this 4-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The trade-off worth checking first is listing pairs it with only 30Ah to 50Ah batteries. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 35A, 13V to 16.5V range
- Lead-acid and LiFePO4 modes
- Copper cable included
Pros
- Costs $52.10 less than the PowerMax PM4-35A
- Dedicated LiFePO4 mode plus fixed voltage steps
- Six listed protections and a copper cable included
- Metal housing with a temperature-triggered fan
Cons
- Listing pairs it with only 30Ah to 50Ah batteries
- No UL-style safety listing in the feature text
Best Fixed 13.75V Supply5 of 6
Fortron/Source SRV Series FSV35-12A-4 RV Power Converter, 35 Amp, 4-Stage Charger on Amazon (opens in a new tab)
Fortron/Source SRV Series FSV35-12A-4 RV Power Converter, 35 Amp, 4-Stage Charger is the better fit when fixed-voltage lead-acid installs.
Best for
- fixed-voltage lead-acid installs
Why it made the shortlist
The intended use case is fixed-voltage lead-acid installs. The documented setup centers on 35A, fixed 13.75V output, forced air cooling, over-voltage and overheat protection.
What separates it on paper is fixed 13.75 volt output cannot be set too high. Its 35A, fixed 13.75V output specification sits at between the lower and upper ends of the comparable range in this 4-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
Before committing, account for no lithium mode or voltage selection is listed. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 35A, fixed 13.75V output
- Forced air cooling
- Over-voltage and overheat protection
Pros
- Fixed 13.75 volt output cannot be set too high
- Forced air cooling and overheat protection are listed
- Over-current and over-voltage protection are stated
- Costs $9.95 less than the RecPro 35 amp
Cons
- No lithium mode or voltage selection is listed
- Fan cooling adds noise and listing gives no dimensions
Best Parallax Swap6 of 6
Parallax Power Supply 4435 4400 Series Deck Mount Converter, 35 Amp on Amazon (opens in a new tab)
Choose Parallax Power Supply 4435 4400 Series Deck Mount Converter, 35 Amp for exact Parallax 4400 series part number listed.
Best for
- exact replacement in a Parallax 4400 bay
Why it made the shortlist
Parallax Power Supply 4435 4400 Series Deck Mount Converter, 35 Amp is positioned for exact replacement in a Parallax 4400 bay. The documented setup centers on 35A 4400 series part 4435, 8 lb package weight, deck-mount format.
The feature doing most of the work here is exact Parallax 4400 series part number listed. Against the other 5 picks, the useful comparison starts with 35A 4400 series part 4435 and 8 lb package weight. Those details show whether its configuration suits the job better than a neighboring recommendation.
The practical constraint here is costs $205 more than the PowerMax PM4-35A. Confirm whether the stated figure refers to product weight or rated working capacity. Compare it with your lifting, transport and support requirements before deciding.
Key dimensions & specs
- 35A 4400 series part 4435
- 8 lb package weight
- Deck-mount format
Pros
- Exact Parallax 4400 series part number listed
- Package size and weight are stated for planning
- Same series as the original in a Parallax bay
- Deck-mount unit can sit near the batteries
Cons
- Costs $205 more than the PowerMax PM4-35A
- Listing gives no charge stages, voltage or lithium detail
How We Built This Shortlist
Each pick was assessed across 5 criteria weighted for real-world use.
- Named factory replacement
- We noted which listings state the exact section they replace, such as WFCO 8935 or Parallax 6336, because fit decides most 35 amp purchases.
- Voltage control
- We checked for numbered voltage steps, an adjustable output or a fixed figure, since a lithium bank needs a particular absorb voltage.
- Battery size fit
- 35 amps suits a small bank, so we looked for stated battery-size limits such as the 30Ah to 50Ah note on one unit.
- Cooling and noise
- We compared listings that describe a temperature-triggered fan, a metal housing or forced air cooling against those silent on heat.
- Price versus published detail
- We weighed the $61.90 to $319.45 spread against how much each listing actually commits to in writing.
What Matters Before You Choose a 35 Amp RV Converter
Key buying criteria so you get the right fit the first time.
Bank size against 35 amps
A 35 amp converter delivers its charge current only after the rig's own DC loads, so a pump and a furnace fan can leave less than 20 amps for the battery. A 100Ah lithium bank at that rate needs several hours, and a larger bank needs a bigger unit. Look up your battery's capacity and the converter's output, then expect about half the output to reach the battery while loads run.
Exact section replaced
Older RVs use sections named WFCO 8935 or Parallax 6336, and the replacement has to match the bay's connectors and holes. A mismatch means cutting and rewiring. Check your existing label for the model, then look for that model name in the listing's replacement text.
Charge voltage selection
A lithium bank wants a set absorb voltage around 14.4 to 14.6 volts and no equalization stage, which a flooded-battery cycle includes. A unit with only a fixed 13.75 volt output will undercharge lithium. Look for numbered voltage steps in the listing and match them against the battery maker's charge spec.
Fan behavior
At 35 amps a converter makes real heat, and a fan that runs only when the unit is warm keeps a van quiet at night. Forced-air models run a fan more often and can be heard. Look for words like temperature-controlled or runs only when needed, and plan clearance around the box.
Mislabeled voltage modes
Several aftermarket units list a 16.5 volt fixed mode, which suits equipment powering, not a battery. If the selector is left there, the battery will be overcharged and can be damaged. Learn which switch position is which, and put a label near the unit.
Listing detail versus price
The most expensive unit here, the Parallax 4435, publishes the least: package size, weight and a part number. A thin listing means you rely on the seller for output and charge specs. Compare the amount of electrical detail in each listing to its price before paying a premium.
Match a 35 Amp RV Converter to Your RV
By Existing Converter in Your Rig
A 35 amp swap is easiest when the replacement matches what came out.
| Your situation | Recommended pick | Why |
|---|---|---|
| Old WFCO 8935 or Parallax 6336 section | PD4635V | Listing names both as sections it replaces |
| Parallax 4400 series deck-mount unit | Parallax 4435 | Same series and part number |
| Generic deck-mount unit, want lithium | PowerMax PM4-35A | Adjustable output at $114 |
| Generic unit, want selectable voltages | RecPro 35A | Offers 13.0, 14.6 and 16.5 volt modes |
| Replacing a cheap unit with another | VEVOR 35A | Lowest price at $61.90 |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| Under $70 | VEVOR 35A |
| $110 to $130 | PowerMax PM4-35A, Fortron SRV35 or RecPro 35A |
| $290 to $320 | PD4635V or Parallax 4435 |
Adjustable or Selectable Voltage vs Fixed Output
- Adjustable or selectable
- The PowerMax PM4-35A, RecPro 35A and VEVOR 35A let you choose or tune the charge voltage, which is what a LiFePO4 bank needs. The risk is picking a setting that does not suit the battery, such as the 16.5 volt step.
- Fixed output
- The Fortron SRV35 holds a fixed 13.75 volts and the PD4635V uses a preset 4-stage cycle. You cannot set a wrong voltage, but you cannot tune for lithium either, so these fit lead-acid banks.
Lithium owners should lean toward an adjustable unit, while lead-acid owners can pick a fixed one for simplicity.
By Battery Bank Size
| Your bank | Recommended pick | Why |
|---|---|---|
| One small 30Ah to 50Ah battery | VEVOR 35A | Listing is written for that size |
| One group 27 lead-acid battery | Fortron SRV35 | Fixed 13.75V with forced air cooling |
| A 50Ah to 100Ah lithium battery | PowerMax PM4-35A | Adjustable lithium output |
| Bank you may grow later | RecPro 35A | Same family goes up to 125 amps |
Scroll sideways to see every column.
For Camper Vans and Small Trailers Specifically
- Look for
- A compact deck-mount box, a fan that runs only when needed, a charge mode that matches a small battery, and enough output to run lights and a pump while charging.
- In this comparison
- The VEVOR 35A is sized for 30Ah to 50Ah batteries at $61.90, and the RecPro 35A adds a quiet temperature-controlled fan for $129.95. The Parallax 4435 is bulky at about 8 pounds in its package and needs a matching bay.
When to Spend More
- Spend more if
- You want an exact fit and a legacy brand; the PD4635V names the WFCO 8935 and Parallax 6336 sections it replaces, and the Parallax 4435 matches a 4400 bay.
- Save if
- You have a small battery and can set the mode by hand; the VEVOR 35A at $61.90 or the PowerMax PM4-35A at $114 cover the job for a third to a half of the legacy price.
Before You Bring One Home
Can a 35 amp converter replace a 30 amp power center?
Not directly. A converter section replaces only the charging part, while a power center includes breakers and fuses. If your rig has a full center, check our 30 amp guide for the WF-8735 class, which delivers 35 amps DC from a 30 amp panel.
Will a 35 amp converter handle a lithium battery?
Only with the right voltage. The PowerMax PM4-35A has an adjustable output, the RecPro and VEVOR offer a 14.6 volt step, and the Fortron and PD4635V list no lithium setting. Confirm the voltage against your battery's spec.
Is the Progressive PD4635V worth $179 over the PowerMax?
Only if you want a named drop-in for a WFCO 8935 or Parallax 6336 bay and a legacy brand. For a new install or a lithium bank, the PowerMax PM4-35A at $114 does more for less.
How do I set the VEVOR or RecPro for LiFePO4?
Pick the lithium mode on the VEVOR or the 14.6 volt step on either, then confirm that matches the battery maker's absorb voltage. Never leave the 16.5 volt step selected.
How long will 35 amps take to charge my battery?
As arithmetic, a 100Ah battery that is half empty needs about 50Ah, and at an effective 20 amps that is roughly two and a half hours. Real time is longer because charge tapers near full.
How do I keep the converter from overheating?
Leave the clearance the manual calls for, keep vents free of dust, and avoid stacking it under a mattress or in a closed cabinet. A temperature-controlled fan only helps if air can get in and out.
Bottom Line
Best overall: Progressive Dynamics PD4635V Inteli-Power 4600 Series Converter/Charger with Charge Wizard, 35 Amp — best legacy replacement pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all 35 amp rv converters on Amazon — Prime-eligible options with current pricing.