Arriving at a Frozen Cabin: Safe Power-Up Checklist

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Why the order matters

A cabin that sat through a freeze is not in the state you left it. Batteries are cold, some may have discharged on their own, plumbing may have split, and a mouse may have visited the wiring. Turning on the inverter first tests all of that at once, with your hands near the equipment.

This checklist is the reverse of our winter shutdown guide. Your own equipment manuals come first, and anything on this list that touches wiring is a job for a licensed electrician if you are unsure.

Step 1: Look and smell before you touch

Walk the outside first. Check the array for damage and snow load, and the wiring for chewed or loose sections. Inside, stop at the door and note any smell. If you smell propane, leave the cabin, do not switch anything on, and call your supplier from outside. If you smell burning, or see water, damage or droppings near the equipment, take photos and leave the system off. Our propane and CO detector guide covers the alarms that help here.

Step 2: Water and fuel before electricity

Check the plumbing before the pump can run. Look for split pipes and wet floors, and confirm the lines are thawed. Do not run a pump against frozen lines; follow the pump's manual. Confirm propane valves and regulators look normal and that the stove and heater are as you left them. Fix leaks first so water is never near live equipment.

Step 3: Check the battery's temperature and condition

This is the step people skip. Many LiFePO4 batteries should not be charged near or below freezing, and their built-in protection may refuse to charge when cold. That is the system protecting itself, and you should not try to bypass it. Battle Born, for example, describes 32 to 113 degrees Fahrenheit as the ideal charging range for its batteries; your battery's manual gives the figure that applies to you. Victron's controller manual lists low lithium battery temperature among the reasons a charger may be off.

Use a non-contact thermometer on the battery case and compare it with the manual. If it is too cold, warm the room gradually with your heat source and wait. Do not aim a heat gun or open flame at a battery. If the battery is swollen, cracked, leaking or smells strange, stop and follow the maker's guidance. For lead-acid, Solar Power World notes that a discharged battery freezes at a much higher temperature than a charged one, so check the case for cracks before you do anything else. See our cold-battery storage guide.

Step 4: Reconnect in your manual's order

If you disconnected parts at shutdown, reconnect them in the order the manuals give. As one example, the Victron SmartSolar manual says to connect the battery first, wait about ten seconds so the charger detects the system voltage, then connect the DC loads and then the PV array. It warns that connecting PV first is only allowed if the system voltage is set manually, and that the wrong order can disable or damage the charger. It also tells you to check polarity before connecting the battery and PV. Your equipment may differ, so read yours. Our disconnect placement guide shows where the disconnects usually sit.

Step 5: Bring loads on one at a time

If the battery has drifted low during the winter, follow the maker's guidance on recharging it, and let the bank rise before you add large loads. Our remote monitoring guide explains how to see these numbers without being on site.

Step 6: Test the alarms and write it down

The CDC advises testing smoke and CO detectors monthly and replacing their batteries twice a year, so a first-visit test is a good habit. Then note the date, the battery voltage and temperature, and anything unusual. A short log makes the next arrival easier. If this is the first cold season, our pre-snow gear list and emergency kit checklist cover what to have on hand next time.

Where to look for the gear

These links open search results for a category, not a specific model. Check every listing against your battery, controller and inverter manuals before you order.