Inverter vs Inverter/Charger: Which Does Your RV Need?

If your existing converter charges your batteries properly, buy a plain inverter. If the converter needs replacing anyway — which a lithium upgrade almost always forces — buy an inverter/charger and let one box do both jobs. That single question settles this choice for most rigs, because an inverter/charger is not a better inverter: it is an inverter, a converter and an automatic transfer switch sharing a case, and its price only makes sense when you needed at least two of the three.

The difference at a glance

What it handles	Plain inverter	Inverter/charger
Makes 120V from the battery bank	Yes	Yes
Charges the bank on shore power	No	Yes — 80A (Xantrex) to 120A (Victron)
Replaces the factory converter	No	Yes
Passes shore power through to loads	No	Yes
Automatic shore ↔ battery switchover	No	Yes — under 20ms on the Xantrex
Boosts a weak pedestal	No	PowerAssist, on the Victron only
Lithium charge profile	Not its job	Built in on both units here
Install	Added alongside what you own	Replaces the converter — a rewiring job
Typical price	Low to mid	Two to five times a plain inverter

Three jobs, one or three boxes

Every powered RV does three things with electricity: it converts shore power to 12V to run the DC systems and charge the batteries (the converter), it may invert battery power to 120V when unplugged (the inverter), and something has to switch loads between those sources (a transfer switch, or you, walking to the compartment).

A factory rig ships with the first job done. Buying a plain inverter adds the second and leaves switching manual. An inverter/charger does all three — which is why the honest comparison is never “inverter vs inverter/charger” on price alone, but inverter you are buying plus converter you already own plus switching you can live with, against one box that does the lot.

The converter question decides it

Here is why this choice keeps coming up in lithium upgrades: most factory converters hold a lead-acid float voltage around 13.6V, and LiFePO4 wants 14.2–14.6V of absorption to actually finish charging. Dakota Lithium states the consequence plainly — a lead-acid charger fills a lithium battery to about 80%, forever. We cover which converters fix that in the best RV converter for lithium batteries.

So the fork looks like this:

• Converter already lithium-capable (or you run lead-acid it charges fine): the charging job is done. Buy the inverter alone, spend the difference on the bank, and skip the rewiring.
• Converter needs replacing: you are about to buy a converter and an inverter and probably wish for automatic switchover. That is the inverter/charger’s case made for it — one purchase, one install, one set of battery cables, and the transfer switch arrives free.

The parts math, honestly run

Price the plain path completely before calling it cheaper: the inverter, plus a lithium-capable converter if yours is not, plus heavy cable runs for each box, plus a transfer switch if you want any outlets to move between sources on their own. Run that way, the gap narrows — and on a rig that needed the converter anyway, it often inverts.

It does not always. A healthy converter and modest inverter needs keep the plain path solidly cheaper, which is why the Renogy 2000W with its included cables remains the default answer for rigs whose charging already works. Both units here are true sine, so the waveform question does not separate them.

Match the relay to the rig

Pass-through is the inverter/charger spec people skip, and it is the one that has to match your service. Everything the unit feeds — on shore power or battery — flows through its transfer relay:

• 30A rig: the Xantrex Freedom XC 2000’s 30A relay is sized to the service exactly, and its charger dials from 80A down to 5A, which is how you refill a big bank from a small pedestal without tripping it.
• 50A coach: the MultiPlus carries a 50A relay — and PowerAssist, which adds up to 25A of inverter output on top of a sagging shore feed during peaks. On a crowded campground in August, that feature is the difference between the second air conditioner running or not. (Whether the Victron premium is worth it against the budget path is its own comparison.) What your pedestal can actually give is covered in 30 amp vs 50 amp RV.

Either way, the charger stage becomes a large new load on the pedestal while it works — an 80A charge into a 12V bank is roughly 1,200W of shore draw before anything else in the rig turns on.

The case for staying separate

A comparison that always lands on the expensive box is an advertisement, so here is the other side.

One box is one point of failure for three functions. When a plain inverter dies, your converter still charges and your shore power still works. When an inverter/charger dies, the compartment wall is doing nothing until the replacement arrives — and both units we recommend are dealer-network products, not next-day marketplace orders.

The plain path installs in an afternoon. An inverter/charger replaces the converter, which means AC-in, AC-out and DC wiring all get touched. It is a rewiring project, frequently a professional one.

Idle draw is on the batteries either way. The MultiPlus’s 20W zero-load (8W in search mode) is well documented; the Xantrex’s is unpublished, which we flagged in the roundup. A plain inverter you switch off at the remote costs nothing while off — and the converter it left in place draws nothing from the bank at all.

Charging while driving is neither box’s job. The alternator side of the system is a DC-DC charger, whichever way this decision goes.

Work down this list

The picks

Both inverter/chargers, the plain-inverter alternatives, and everything we verified about each are in the best RV inverters.

Related guides

• Best RV inverters — all seven units compared, both categories included.
• Best RV converter for lithium batteries — the plain path’s other half, if your converter is the problem.
• What size inverter do I need? — the wattage decision, sized from the battery bank.
• Do you need a pure sine wave inverter? — the waveform half of the shopping question.
• Do I need a DC-DC charger? — charging from the alternator is a third box, whichever way this goes.
• 30 amp vs 50 amp RV — what the pedestal can give while a big charger is working.
• The electrical section collects everything published so far.

For how products on this site are selected and what we do not claim about them, see the editorial policy.

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