When an ice storm knocks out power to a remote cabin, keeping the Rinnai RL75iP tankless propane water heater running is a small-watt, high-stakes problem. A Jackery Explorer 2000 Plus Rinnai RL75iP tankless ice storm setup is overkill for the ignition and fan loads (roughly 80–120W running, ~2A startup) — which means it can deliver days of hot showers plus enough headroom to run lights, a fridge, and a CPAP. If you don't already own the Jackery, the EcoFlow RIVER 2 Pro and RIVER 3 Plus offer LiFePO4 chemistry, fast recharge, and enough sustained AC output to keep your propane tankless cycling through a multi-day 2026 outage.
Why the Rinnai RL75iP barely needs a battery at all
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Propane tankless heaters are deceptively easy to back up because the propane does all the heating — electricity only runs the spark igniter, exhaust fan, modulating gas valve, and control board. The Rinnai RL75iP (an indoor 7.5 GPM unit with internal freeze protection) draws about 2 amps at 120V on ignition and settles into roughly 80–110 watts while burning. Idle standby with freeze protection enabled is a trickle — single-digit watts, occasionally spiking when the internal heaters cycle in subzero conditions.
That changes the sizing math entirely. You aren't trying to run a 4,500-watt electric tank; you're trying to keep a sophisticated gas appliance alive on the equivalent of two LED bulbs. Even a 245Wh portable power station can deliver multiple hot showers from a single charge, provided you have propane in the tank and water in the lines.
How long does each power station run a Rinnai RL75iP?
Assuming an average 100W draw while the heater is actively firing and roughly 2.5 cumulative hours of burn time per day (showers, dishwashing, and brief sink use for a couple in a small cabin), here is how each of the available units shakes out in real-world ice-storm conditions:
| Power Station | Capacity | AC Output | Continuous RL75iP Runtime | Realistic Cabin Days |
|---|---|---|---|---|
| EcoFlow RIVER 3 | 245 Wh | 300W (X-Boost 600W) | ~2 hours firing | 1 day |
| EcoFlow RIVER 3 Plus | 286 Wh | Up to 1200W | ~2.4 hours firing | 1–1.5 days |
| EcoFlow RIVER 2 Max | 499 Wh | 500W (X-Boost 1000W) | ~4.2 hours firing | 1.5–2 days |
| EcoFlow RIVER 2 Pro | 716 Wh | 800W (X-Boost 1600W) | ~6 hours firing | 2–3 days |
Runtime assumes 100W continuous burner draw and 85% inverter efficiency. *Cabin days assume the heater fires for ~2.5 hours of cumulative burn time per day plus minor freeze-protection load.
EcoFlow RIVER 2 Pro — best overall pick for an ice-storm cabin
With 716Wh of LiFePO4 capacity, 800W of continuous AC output (1600W X-Boost), and the ability to recharge from empty to full in about 70 minutes from wall power, the RIVER 2 Pro is the most forgiving choice for keeping a Rinnai RL75iP firing through a multi-day outage. The 800W inverter handles surge loads from a compressor fridge or modest power tool you might also need, and LiFePO4 cells tolerate the cold mechanical-closet installs that cabins inevitably impose. EcoFlow RIVER 2 Pro Portable Power Station.
EcoFlow RIVER 2 Max — the right-size middle ground
The 499Wh RIVER 2 Max is the sweet-spot sibling: enough capacity for ~2 days of tankless duty, a 500W pure-sine inverter that won't confuse the Rinnai control board, and a full recharge in roughly 60 minutes. If your cabin has a small generator you can fire up briefly to top off between storms, the RIVER 2 Max effectively becomes an unlimited bridge with very little fuel burn. EcoFlow RIVER 2 Max Portable Power Station.
EcoFlow RIVER 3 Plus — compact, surprisingly capable
At 286Wh and with AC output up to 1200W, the RIVER 3 Plus is the lightest unit that can still cover meaningful Rinnai duty plus a small fridge cycle. It's the one to grab if you're already packing a snowmobile or sled for cabin access and weight matters. FlexSolar 100W Portable Solar Panels Chargers with PD3.0 USB-C.
EcoFlow RIVER 3 — emergency-only backstop
The 245Wh RIVER 3 is the minimum I'd consider for keeping a Rinnai RL75iP igniting. It's not your primary plan, but for a modest outlay you get roughly a day of hot water during a regional outage — a credible "we got caught off guard" insurance policy that lives in a kitchen drawer. EcoFlow RIVER 3 Portable Power Station.
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How the Jackery Explorer 2000 Plus compares
If you already own a Jackery Explorer 2000 Plus Rinnai RL75iP tankless ice storm pairing, you're working with 2042Wh of LiFePO4 capacity — roughly 2.8x the RIVER 2 Pro. In practical terms, that's more than a week of tankless runtime at the duty cycles described above, with enough left over to run cabin lighting and even a small electric blanket on the coldest nights. The Jackery's 3000W output is wasted on the Rinnai itself, but pays off the moment you need to also run a well pump, microwave, or larger compressor refrigerator.
The tradeoff: the 2000 Plus weighs about 60 lb, takes longer to recharge from winter solar, and costs several times what a RIVER 2 Pro does. For a single propane tankless and basic lighting in a weekend cabin, the smaller LiFePO4 units above give you more capacity per dollar; for a year-round residence that loses grid power for a week or more, the 2000 Plus earns its keep.
Solar recharge during an ice storm — what actually works
Solar input during a North American ice storm is brutally limited. Overcast skies, snow-glazed panels, and 4-hour usable daylight windows in January mean you should plan on 15–25% of nameplate solar wattage at best. A 200W panel will realistically deliver 30–50W into your power station — enough to extend a RIVER 2 Pro by a day or two per week of outage, but not enough to fully sustain it.
For ice-storm prep, prioritize ground-mounted or steep-angle panels that shed snow, and brush them off after every storm. A second power station you rotate to the truck or generator for fast topping up is almost always more practical than chasing more panel capacity. See our cold-weather power station guide for sub-freezing battery behavior and our cabin solar generator sizing guide for layout tips.
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Freeze protection: the load that sneaks up on you
The Rinnai RL75iP includes internal freeze-protection heaters that kick in below about 37°F. In an uninsulated mechanical closet during a polar vortex, those heaters can pull 60–150W intermittently for hours — far more energy than the burner itself uses during a shower. If your battery dies because of freeze protection, you don't just lose hot water; you risk a cracked heat exchanger and a four-figure repair bill.
Practical defenses: keep ambient temperature in the heater closet above 40°F with a low-watt ceramic heater on a thermostat, insulate the inlet/outlet lines, and prioritize draining the unit per Rinnai's instructions if you'll be off-grid and unattended for more than 24 hours. Our propane tankless backup guide walks through the drain procedure step by step.
Wiring it up: don't overthink it
The Rinnai RL75iP ships with a standard 120V plug. During an outage, unplug it from the wall outlet and run a heavy-duty extension cord (12 AWG minimum, 25 feet or less) from any of these power stations directly to the heater. There's no interlock or transfer switch required for a single-appliance backup like this — just remember to swap back when grid power returns so you don't drain the battery on a cycle you didn't notice.
If you want a permanent install, an electrician can wire a small inlet box and manual transfer switch for under $400 in parts. That's worth it for a year-round home but rarely justified for a seasonal cabin where the extension-cord approach is faster and equally safe.
What about pairing with a small inverter generator?
The most resilient cabin setup is a power station that handles the always-on loads (Rinnai controls, fridge, lights, phone charging) combined with a small inverter generator that runs for an hour twice a day to recharge the battery and power a microwave or coffee maker. This pattern minimizes generator runtime, fuel use, and noise — and gives you total quiet during sleeping hours when the Jackery Explorer 2000 Plus Rinnai RL75iP tankless ice storm setup carries the night load silently.
Frequently Asked Questions
Can a 300W power station really run a Rinnai RL75iP tankless?
Yes, as long as the inverter is pure sine wave. The RL75iP draws only 80–110W during active firing and a few watts on standby. The 300W native output of an EcoFlow RIVER 3 has comfortable headroom; X-Boost is not required for normal operation, only if you need to start something else on the same circuit.
How many showers can I get from a Jackery 2000 Plus during an ice storm?
Assuming 10-minute showers and a typical 100W average burner draw, a 2042Wh Jackery 2000 Plus can support 200-plus shower-equivalents of tankless runtime — more than two weeks of family use. In practice, freeze-protection load and parallel cabin loads (lights, fridge) will be the real limiters, not showers themselves.
Will the Rinnai RL75iP run on a modified sine wave inverter?
Rinnai does not officially support modified sine wave power for the RL75iP. The control board and modulating gas valve can behave erratically, throw fault codes, or fail outright. All EcoFlow RIVER and Jackery Explorer units listed here output pure sine wave, so this isn't a concern with any pick on this page.
Do LiFePO4 power stations work in subzero cabin temperatures?
LiFePO4 cells can discharge down to about -4°F (-20°C) but cannot be charged below freezing without damaging the cells. If your power station is stored in an uninsulated cabin, bring it inside a sleeping bag or warm closet to recharge from solar or generator input. EcoFlow's BMS will refuse to charge below 32°F as a safety measure, which is annoying but ultimately protects the battery.
What size solar panel matches an EcoFlow RIVER 2 Pro for cabin use?
The RIVER 2 Pro accepts up to 220W of solar input. A 200W panel is the sweet spot in winter, when icy or overcast conditions cap real-world production around 30–60W anyway. For three-season use, two 100W panels wired in parallel let you split mounting locations and chase available sun across the cabin's roofline.
Can I run my well pump from the same power station as the Rinnai?
A typical 1/2 HP submersible well pump surges to 3000–4000W on startup, which exceeds even the RIVER 2 Pro's 1600W X-Boost rating. You'll want a Jackery Explorer 2000 Plus, EcoFlow DELTA Pro, or similar unit with at least 2000W continuous and 3000W-plus surge capacity for combined Rinnai-plus-well-pump duty. See our LiFePO4 vs NMC comparison for surge handling differences between chemistries.
How long does it take to recharge these power stations from a small generator?
The EcoFlow RIVER 2 Max recharges fully from AC in about 60 minutes; the RIVER 2 Pro takes about 70 minutes. From a 2200W inverter generator running in ECO mode, expect 70–100 minutes for the Max and 80–120 minutes for the Pro. That's a single coffee-and-breakfast generator session per day to keep a cabin's tankless and basics running indefinitely through an extended ice storm.
Key Takeaways
- Choosing the right Jackery Explorer 2000 Plus Rinnai RL75iP tankless ice storm means matching capacity and output ports to your actual devices
- Always check actual watt-hours (Wh), not just watts — runtime depends on Wh, not peak output
- Also covers: Explorer 2000 Plus tankless water heater
- Also covers: Rinnai RL75iP battery backup
- Also covers: cabin tankless heater ice storm
- Compare price-per-Wh across models to find the best value for your budget