6 Best Budget 35 Amp RV Converters in 2026: A Practical RV Guide

A built-in LCD sets this PowerMax apart. Output voltage is adjustable from 13V to 16V and shown on screen, so the number you set is the number you can read, and charging can be set to Fixed, 2-Stage or 3-Stage for lithium, AGM, gel or flooded batteries.

Up to 35 amps flows from 120V AC shore or suitable generator power, shared between the DC loads and the battery. Electrical protection covers reverse polarity, overload, thermal and short circuit, and a proportional fan runs as needed instead of constantly.

A good match for an owner who is thinking about a lithium upgrade and wants to dial in a voltage from the manufacturer sheet.

Dimensions and weight are in the listing: 7.8 by 9.5 by 3.5 inches, 7 pounds, with mounting flanges. Maximum AC input is stated at 8 amps, which tells you exactly how much load it adds to the branch circuit it shares.

Factory mode runs a three-step Boost, Normal and Storage sequence at about 14.6V, 13.6V and 13.2V, and a fixed mode turns it into an adjustable 13.0 to 16.5V power supply for lithium setups with the maker's voltage dialed in. The fan runs on demand, with the usual reverse polarity, overload and thermal protection.

Best for a mid-size install where the owner wants a published footprint and a clear AC figure.

Rated at 35 amps DC and 595W on a 105 to 130V AC input, this is a straight replacement for the WF-8735-AD family. The listing lays out its stages as 13.2V float, 13.6V absorption and 14.4V for the high-capacity mode.

Protection runs through overload, short circuit, over-voltage, over-current and over-temperature, and the unit shuts off power in abnormal conditions. Landing in the middle of the shortlist, it asks about the same as the PowerMax units while sticking to a classic three-stage lead-acid approach.

Travel trailers, campers and caravans are the stated fit.

This listing goes beyond a bare converter. It is described with a 30A main circuit, 6 DC circuits and 5 AC circuits, which makes it a power center that distributes shore power and 12V fuses while it converts and charges.

Charging is three-stage with auto-detect technology that recognizes the battery type, running 13.2V float, 13.6V absorption and 14.4V bulk, with a 105 to 130 VAC input and 35A DC output at 595W. A smart chip adds protection against overcharge, short circuit and over-temperature.

A small to mid-size trailer with a worn-out center benefits most from the single-box swap.

Fit for the PowerMax PM3-35 is the headline. Its label states it works with factory-standard wiring and needs no high-power circuit modifications, and its compact, lightweight body goes into tight RV spaces.

Output is 35 amps across a 13V to 16.5V range on 110V input, rated at 700 to 800 watts, and an electroplating coating guards the body against corrosion and oxidation. It stands as the second-lowest position in this shortlist on price, a clear step under the PowerMax units.

Lowest on this list, the VEVOR 35A still carries dedicated modes for lead-acid and LiFePO4 batteries plus a fixed-voltage mode with 13.0V, 14.6V or 16.5V options. That mix is the reason it earns a spot above the plain replacement units.

Charging is multi-stage with a temperature-triggered fan, and six protections cover short circuit, over temperature, overload, low voltage, overvoltage and reverse polarity. The listing frames 35 amps as suited to small-capacity battery banks and light loads such as lights and speakers.

Weekend campers with a single battery, or a small lithium bank, are the target.