How to Winterize Your RV's Power System: Batteries, Solar, and Inverters

Every RV winterizing checklist covers the plumbing: drain the tanks, blow out the lines, add antifreeze. Far fewer cover the power system, and that's how a lot of RVers start spring with a dead battery, a tripped battery management system, or a lithium bank that won't take a charge.

Batteries are the most expensive part of most RV power systems, and winter is hard on them. Small electrical loads drain them slowly for months. Lead-acid batteries can be damaged if they sit discharged in the cold. Standard lithium batteries shouldn't be charged below freezing at all.

The good news: winterizing your power system takes less than an hour. Here's how to do it for your batteries, solar, and inverter, plus what self-heating lithium batteries actually do in cold weather.

Step 1: Decide Where the Batteries Will Spend the Winter

Start with your battery's storage temperature rating, which you'll find in its specs. It tells you whether the battery can safely sit in an unheated RV through your local winter. Ratings vary a lot, even among lithium batteries:

If your area regularly drops below your battery's minimum storage temperature, take the battery out and store it somewhere protected, like a heated garage or basement. Disconnect the negative cable first, label the wires, and set the battery on a stable, dry surface.

Step 2: Set the Right Storage Charge Level

Storage charge depends on your battery chemistry.

• Lithium (LiFePO4): follow your manufacturer's storage guidance. Many lithium makers recommend storing at a partial charge rather than 100%, but the exact range varies by brand. Our LiFePO4 maintenance guide explains why. Lithium self-discharges slowly, but parasitic loads can still drain it (see Step 3).
• Lead-acid and AGM: store fully charged, and keep them topped up with a maintainer or solar. A discharged lead-acid battery is more vulnerable to freeze damage than a full one.

Not sure which chemistry you have, or thinking about upgrading? RV Battery Bank 101 compares lithium, AGM, and lead-acid.

Step 3: Shut Down Parasitic Loads

Even when everything looks off, an RV draws small amounts of power around the clock. Common culprits:

• Propane and CO detectors
• Stereo and clock memory
• Inverter standby draw
• Charge controllers, monitors, and USB outlets
• Slide-out and leveling control boards

Use your RV's battery disconnect switch, but know that on some rigs it doesn't isolate every circuit. For a long storage period, disconnecting the negative battery cable is the surest way to stop the drain. If your lithium battery's BMS shuts down from a deep discharge, our guide to batteries that won't hold a charge covers common fixes.

Step 4: Power Down the Inverter

• Turn it off at the unit, not just the remote panel, to eliminate standby draw.
• Open its DC disconnect or breaker if your system has one.
• Unplug sensitive electronics from inverter-powered outlets.
• If it's an inverter/charger, confirm its charging profile matches your battery chemistry before you plug into shore power again.

Step 5: Plan for Solar Charging in Freezing Weather

Solar can be a great off-season battery maintainer: it offsets self-discharge and keeps lead-acid batteries topped up. But it creates a winter risk for lithium owners: most standard LiFePO4 batteries should not be charged below roughly 32°F, and your panels will keep trying to charge on a sunny, freezing day.

Your options:

• Disconnect the solar input at the charge controller or its breaker if your battery has no low-temperature charge protection or heater.
• Use a battery with built-in low-temperature protection or self-heating (more below), so the battery manages cold charging safely.
• Monitor remotely. Victron's SmartSolar MPPT controllers (available as 75/15, 100/30, and 100/50) have built-in Bluetooth, so you can check charging and configure settings through the VictronConnect app on your phone.

While you're up there: brush off heavy snow when it's safe to reach, check panel mounts and roof sealant, and make sure wiring connections are tight and dry. The Complete RV Solar Power System Guide explains how the pieces work together.

Step 6: Storing on Shore Power

Keeping the RV plugged in all winter is convenient, but check your converter or inverter/charger first. A charger left on a lead-acid profile can be the wrong fit for lithium, and a charger that holds lithium at 100% for months isn't ideal for long-term storage either. Confirm your charger has a profile that matches your battery, or unplug and rely on Steps 2–3 instead.

The Cold-Climate Upgrade: Self-Heating Lithium Batteries

If you camp in shoulder seasons, travel to ski areas, or live in your RV through winter, a self-heating lithium battery solves the below-freezing charging problem. These batteries warm their own cells before accepting a charge.

Specs from the PowerGen Store listings; where noted, figures come from one model in the series. All three lines include Bluetooth monitoring.

Running a Victron system? The Epoch 460Ah V2 Elite adds Victron communication and supports up to 16 units in parallel, according to the listing.

Browse all lithium LiFePO4 batteries.

Using a Portable Power Station in Your RV?

Many RVers use a portable power station in place of, or alongside, a house battery. Store it indoors over the winter at the charge level its manual recommends, and check it every couple of months. Weighing a power station against a generator for next season? See RV Inverter Generator vs. Portable Power Station.

Frequently Asked Questions

Should I remove my RV battery for the winter?

If winter temperatures where you store the RV fall below your battery's storage rating, yes. Otherwise, you can leave it installed with the negative cable disconnected and the battery at its recommended storage charge.

Can I charge a lithium RV battery below freezing?

Not a standard one. Most LiFePO4 batteries shouldn't be charged below roughly 32°F. Self-heating batteries like the Rich Solar ALPHA, Epoch heated series, and Renogy Pro Self-Heating warm themselves using charging power before accepting a charge.

Will my solar panels keep my batteries charged all winter?

Solar can offset self-discharge, but short days and snow cover reduce output. With lithium, make sure the battery has low-temperature protection or self-heating, or disconnect the solar input during freezing weather.

Does a self-heating battery protect itself in storage?

No. The heaters run on charging power, so a disconnected battery won't heat itself. Follow its storage temperature rating.

When spring comes, our upcoming Spring RV De-Winterizing Checklist will walk you through bringing the system back online.