6 Solar Power Bank Long Lasting of 2026 for Off-Grid Backup

The JKELAR 50000mAh Portable Charger is an ultra-high-capacity backup power bank engineered for users who need extended power independence far away from standard wall outlets. Equipped with a massive 50,000 mAh listed nominal capacity and integrated charging cords, this unit serves primarily as a dependable mobile charging station for campers, road trippers, festival attendees, and home emergency preparedness kits. Unlike lightweight pocket chargers designed for single daily top-offs, this substantial battery pack focuses on prolonged endurance across multi-day outings and power outages.

Charging performance centers on a maximum output of 22.5W, enabling rapid power delivery for compatible smartphones, tablets, and small USB-powered mobile accessories. The power bank features a built-in USB-C cable, an integrated iOS cable, and an additional USB-C port, allowing users to charge multiple devices at once right out of the box. While the 50,000 mAh manufacturer specification reflects nominal internal battery capacity rather than net delivered energy due to natural voltage conversion and thermal dissipation, it provides enough stored energy to recharge modern smartphones multiple times over an extended journey.

Constructed in an Onyx finish with fire-retardant housing materials, the battery pack integrates practical utility features including a digital LED display and a built-in emergency flashlight. The front-facing digital readout reports the exact remaining charge percentage, removing the guesswork commonly associated with basic four-dot LED indicator bars. Physically, the charger measures 6.5 by 3.5 by 1 inches and weighs approximately 1.08 pounds, reflecting the dense internal battery cells required to support such high storage capacity.

Operating the power bank is straightforward, with the integrated cables neatly tucking into the housing to streamline packing in a backpack, glove compartment, or duffel bag. Users can plug directly into an iPhone or USB-C device without rummaging for loose cords, while the extra USB-C port accommodates the included auxiliary USB-C cable for an additional device or battery recharging. The onboard flashlight offers functional utility during roadside emergencies or dark campsites, and the manufacturer backs the internal circuitry with multi-shield overcharging and short-circuit protections alongside a 3-year replacement plan.

The primary tradeoffs of this device stem directly from its substantial capacity, weight, and power profile. At over one pound and an inch thick, it is not suited for pocket carry, and replenishing a depleted 50,000 mAh reservoir inevitably requires hours connected to a reliable wall adapter. Furthermore, a 50,000 mAh lithium battery pack typically equates to an energy rating well above the standard 100 watt-hour threshold enforced by many commercial airlines, meaning travelers should check specific airline guidelines prior to bringing it aboard a flight. Additionally, the 22.5W maximum output is optimized for smartphones and small mobile gadgets rather than high-wattage USB-C laptops.

For road trippers, outdoor enthusiasts, busy families, and emergency-kit planners seeking days of reliable phone power without packing extra cables, this JKELAR power bank offers outstanding convenience and utility. Commuters and frequent flyers who require an ultra-portable pocket companion or high-output laptop charging should look toward smaller 10,000 mAh to 20,000 mAh units instead. However, for sheer off-grid stamina and all-in-one cable convenience, this high-capacity charger delivers solid practical value.

Understanding nominal capacity versus delivered energy is essential when evaluating a high-capacity power bank. The listed 50,000 mAh specification represents the combined capacity of the internal battery cells at nominal voltage. During real-world charging, voltage conversion from cell voltage up to USB charging levels, alongside natural thermal loss, means the total energy delivered to a device is lower than the mathematical sum of the cell capacity. Nevertheless, a bank of this size offers vastly more backup cycles than typical everyday power accessories.

Travelers should also evaluate regulatory rules regarding large lithium battery packs before packing for a flight. Most major commercial airlines enforce a strict limit of 100 watt-hours for unapproved lithium-ion battery packs in carry-on luggage, with spare batteries completely forbidden in checked baggage. Because a 50,000 mAh pack typically operates in the range of 185 watt-hours assuming standard 3.7V lithium cells, airline passengers should check with their specific carrier before bringing this unit to an airport. For road travel, tailgating, camping, and home emergency kits, however, these airline restrictions do not apply.

The integration of built-in charging cables directly addresses one of the most common everyday frustrations: forgotten or tangled charging cords. Having both a dedicated USB-C cord and an iOS-compatible cord attached to the body of the charger ensures immediate usability for both Android and iPhone devices. This setup keeps travel bags organized and allows immediate sharing with friends or family members who use different device connection types.

The unit supports up to 22.5W fast charging, which supplies sufficient power for compatible fast-charging smartphones and tablets. It is useful to recognize that this 22.5W maximum is aimed at mobile devices rather than laptop computers, which frequently demand 45W, 65W, or higher over USB Power Delivery. When multiple devices are plugged into the integrated cables and the open USB-C port simultaneously, charging power is distributed among the connected devices based on internal power management.

The BLAVOR 20000mAh Solar Hand Crank Power Bank is an outdoor-focused portable battery pack engineered primarily for campers, hikers, and emergency-preparedness kits. Unlike standard slim power banks designed strictly for brief urban commutes, this rugged unit prioritizes self-reliance in off-grid environments by combining a high-capacity internal battery with a mechanical hand crank generator, a solar absorption panel, and built-in charging cables.

In terms of electrical capability, the unit features a nominal 20,000mAh capacity paired with a 20W USB-C Power Delivery port and a multi-tier wireless charging surface supporting 5W, 7.5W, 10W, and up to 15W output. According to manufacturer specifications, this capacity is sufficient to charge an iPhone 17 up to 4.1 times, a Galaxy S24 Ultra 3.6 times, or an iPad Mini 6 up to 2.7 times, though actual delivered energy will vary depending on conversion losses and device power states. The device also accommodates up to seven devices simultaneously by utilizing three open ports (one USB-C and two USB-A) alongside four tethered cables (two USB-C, one iOS Lightning, and one USB-A).

The physical design emphasizes field durability and multifunctional utility. Built from flame-retardant ABS and polycarbonate materials enclosed in protective silicone, the charger measures 7.16 by 3.86 by 1.7 inches and weighs 1.25 pounds. Its heavy-duty casing provides shockproof, dustproof, and water-resistant protection against adverse weather. Beyond its charging functions, the housing integrates an emergency flashlight, a broad camping lantern, a magnetic directional compass, an ambient thermometer, and a sturdy attachment loop with an included carabiner and rope.

Operating and recharging the power bank is straightforward, though understanding its charging inputs is essential for realistic expectations. The primary and fastest method to replenish the 20,000mAh cell is through standard wall power using the USB-C port or the integrated USB-A input cable prior to leaving home. The fold-out hand crank serves as a manual backup mechanism where one minute of continuous cranking produces approximately five minutes of lighting during a sudden blackout. The solar panel provides secondary trickle charging under direct sunlight, while the integrated cables snap neatly into exterior side grooves to prevent loose cords inside a backpack.

Realistic limitations reflect the tradeoffs inherent to heavy-duty emergency gear. At 1.25 pounds and nearly two inches thick, this model is significantly heavier and bulkier than standard pocket-sized portable chargers. While charging up to seven devices simultaneously is supported, connecting multiple devices distributes available current and reduces the charging wattage per port. Additionally, both the hand crank and solar panel are supplemental emergency features intended to generate critical lighting or survival-call power rather than rapidly recharging the massive 20,000mAh battery from empty.

For hikers, campers, road trippers, and homeowners looking for a dependable backup battery during severe storms or prolonged outdoor stays, the BLAVOR 20000mAh Solar Hand Crank Power Bank provides exceptional versatility and cable-free convenience. Daily commuters who only need a quick, lightweight boost for an office commute will likely prefer a slimmer pocket charger, but users seeking comprehensive off-grid security will find this feature-packed power station to be a valuable addition to their gear.

The BLAVOR solar charger stands out in the portable power category due to its integrated manual hand crank generator. In the event of a total battery depletion far from an electrical grid, users can unfold the mechanical handle and rotate it to generate immediate power. Just one minute of continuous manual rotation produces up to five minutes of operational runtime for the integrated emergency lighting system.

Complementing its power-generation features, the device serves as a compact survival station. It incorporates a focused front flashlight for trail navigation, a wide-beam camping lantern for tent illumination, a built-in compass for directional orientation, and a thermometer to monitor environmental conditions. Reinforced by silicone port covers and a flame-retardant ABS and PC chassis, the unit is constructed to endure drops, dust, and wet weather during outdoor expeditions.

The BLAVOR Solar Power Bank 10,000mAh is a rugged portable charger engineered for outdoor enthusiasts, campers, travelers, and emergency-prep users who need durable off-grid backup power. Built around a 10,000mAh Lithium-cobalt battery pack, this unit combines traditional wired power with a wireless charging surface and an emergency solar panel. It best suits American smartphone users, hikers, and commuters seeking a resilient secondary power source that can withstand unpredictable weather while keeping essential mobile gear operational.

In terms of charging performance, the unit features an upgraded USB-C output supporting up to 20W fast charging alongside wireless charging functionality. According to manufacturer claims, the 20W wired connection can power an iPhone 15 up to 65% in approximately 30 minutes, with broad compatibility spanning iPhone, iPad, Samsung Galaxy, and other USB-powered mobile devices. The manufacturer also estimates that a fully charged 10,000mAh battery can recharge an iPhone 8 up to 3.6 times, an iPhone 14 Pro up to 2.2 times, or an iPad Air once. Users can charge up to three devices simultaneously using the available wired and wireless outputs, though connecting multiple devices will divide overall output power.

The physical design emphasizes field durability, featuring flame-retardant ABS and PC construction wrapped in a rubberized protective coating with waterproof silicone port sealing. Measuring 5.9 x 3.1 x 0.8 inches and weighing roughly 0.58 pounds, the battery pack remains comfortably portable for backpacks, daypacks, or glove compartments. It carries an IPX5 water-resistance rating along with dustproof and shockproof qualities to endure outdoor exposure. Dual integrated super-bright flashlights provide nighttime visibility around camp, while the included compass carabiner lets hikers secure the charger directly to exterior pack webbing.

Routine operation is straightforward, with dedicated ports for wired connections and a dedicated surface for wireless charging. Recharging the internal battery pack is primarily completed through its wired input for speed and consistency before heading out on trips. While the integrated solar panel provides an auxiliary method to harvest sunlight, solar inputs on compact hand-held chargers are inherently gradual and best reserved for emergency top-offs rather than daily replenishments. The lightweight profile and included attachment clip make it simple to monitor battery status while trekking or commuting.

Important practical limitations should be weighed before relying solely on this charger in remote locations. First, the 20W peak output is optimized for smartphones, earbuds, and small tablets, meaning it is not designed to power USB-C laptops that require higher wattage profiles. Second, simultaneous multi-device charging will naturally distribute the power budget, reducing individual port speeds across connected gear. Finally, the nominal 10,000mAh capacity will experience standard conversion and circuit losses during wired and wireless transfers, so delivered energy will be lower than the raw battery cell rating.

For hikers, road trippers, and emergency-kit planners wanting an affordable, weather-resistant charger with fast wired and wireless options, the BLAVOR 10,000mAh Solar Power Bank is a practical and versatile choice. Everyday commuters who only need pocketable power for office use may prefer a slimmer, non-rugged power bank without exterior outdoor tools. However, for outdoor recreation and reliable emergency backup, its combination of 20W USB-C output, IPX5 protection, integrated dual flashlights, and durable Lithium-cobalt construction offers solid utility.

The BLAVOR portable charger delivers power through a 20W USB-C fast-charging output as well as an integrated wireless charging pad. This dual-format design accommodates modern smartphones such as iPhone and Samsung Galaxy devices, along with portable accessories like wireless earbuds. The charger supports powering up to three devices simultaneously, providing flexible backup options during outdoor outings or power outages.

Because total power is shared when multiple devices are connected, the fastest charging rates are achieved when plugging a single device directly into the 20W USB-C port. Actual charging speeds will always depend on device reception limits, cable capability, and operating temperatures.

Engineered for outdoor survival and demanding environments, the charger features an IPX5 water-resistant, dustproof, and shock-resistant chassis. The housing combines flame-retardant ABS and PC materials with internal silicone seals and a tactile rubber skin-feel exterior to resist drops and adverse weather.

BLAVOR utilizes a Lithium-cobalt battery composition, which the manufacturer states provides 50% more cycle life compared to standard lithium-polymer cells. Integrated dual super-bright flashlights and an included compass carabiner deliver functional utility for nighttime navigation and gear attachment.

The BLASOUL Solar Power Bank is a high-capacity external battery pack engineered specifically for outdoor recreation, emergency backup preparedness, and multi-device mobile users. Outfitted with a nominal 49,800 mAh lithium-polymer battery, built-in cables, and an integrated solar cell, this unit serves as a self-contained mobile power station. It best suits campers, hikers, road trippers, and homeowners preparing for severe weather outages who require dependable backup power without packing a tangled assortment of separate charging accessories.

Charging performance is anchored by versatile wired and wireless options, delivering up to 22.5W through supported Power Delivery 3.0 and Quick Charge 3.0 standards. The dedicated built-in USB-C cable provides up to 20W when used alone, which the manufacturer states can take an iPhone 14 up to 60 percent in approximately 30 minutes. In addition to tethered charging, the unit features an elevated 15W wireless charging pad compatible with wireless-capable devices such as recent Apple iPhone and Samsung Galaxy handsets. Buyers should note that nominal battery capacity represents internal cell storage rather than net delivered energy, as routine voltage conversion and environmental factors naturally influence usable output.

The physical casing measures 7 by 3.66 by 1.28 inches and is built to withstand demanding conditions, featuring an IP65 rating for water, dust, and shock resistance. Cable management is neatly integrated into the frame, stowing three output connectors (Lightning, USB-C, and Micro-USB) along with a USB-A input cable directly within molded channels. An ultra-bright LED flashlight is integrated into the housing, offering steady beam, SOS emergency beacon, and strobe signaling modes for nighttime campsite navigation and roadside breakdowns.

Replenishing the power bank itself can be accomplished either via an external wall adapter using the built-in USB-A lead or through compatible USB-C inputs. While the integrated solar panel provides auxiliary top-off capability when exposed to direct sunlight, solar replenishment is fundamentally slow due to the compact surface area and should be treated as an off-grid safety net rather than a daily charging method. Because of the substantial 1.28-inch profile and heavy battery mass, the charger is much better suited for storage in backpacks, dry bags, or emergency bins than everyday jacket pockets. Furthermore, because a 49,800 mAh lithium battery rating significantly exceeds standard 100Wh airline carry-on limits, air travelers should consult airline policies and avoid counting on this unit for standard commercial flight travel.

The primary limitations of this power bank stem directly from its heavy-duty capacity and ruggedized build. Everyday commuters looking for an ultralight, pocket-friendly charger will find the substantial dimensions cumbersome for quick urban transit. In addition, integrated cables cannot be individually swapped or upgraded if a single connector experiences wear over time, meaning users must handle the tethered leads carefully. Full AC wall replenishment also requires dedicated planning before heading outdoors, as relying on the solar panel alone to fill an empty battery pack of this size is impractical.

The BLASOUL 49800mAh Solar Power Bank is an excellent match for outdoor enthusiasts, remote field workers, and families assembling storm-ready emergency kits. Minimalist commuters and airline passengers will be better served by a slim, lower-capacity power bank that complies smoothly with standard flight regulations. However, for anyone needing multi-day battery reserves, broad cross-device compatibility, and all-in-one cable convenience away from electrical grids, this rugged charger offers outstanding practical value.

Wired charging speeds on the BLASOUL battery pack reach up to 22.5W via compatible PD 3.0 and QC 3.0 fast-charging protocols. The integrated USB-C cable delivers up to 20W output when used independently, offering rapid power delivery to modern smartphones, action cameras, and portable camping gadgets.

Wireless charging functionality supports up to 15W maximum output for Qi-enabled devices. Users can simply place an iPhone, Samsung Galaxy, or compatible wireless earbud case on the designated charging zone, eliminating the need to untangle cords during downtime at camp or at a work desk.

Outdoor resilience is reinforced by an IP65 weather-resistant casing designed to repel dust, splashes, rain, and minor trail impacts. The rugged exterior makes it a dependable companion for kayaking, fishing, backpacking, and unpredictable outdoor environments.

Emergency functionality is bolstered by the top-mounted LED illumination system and solar charging strip. The flashlight toggles between continuous steady light, an emergency SOS distress pulse, and a rapid strobe signal, while the built-in solar panel provides passive trickle replenishment during extended grid failures.

The SOARAISE 48000mAh Solar Power Bank is an outdoor-focused, high-capacity portable charger engineered for campers, road trippers, emergency-preparedness shoppers, and multi-device users who spend extended time away from AC outlets. Equipped with a massive 48,000 mAh lithium-polymer battery and four foldable solar panels, this unit serves primarily as a self-contained power hub. It is best suited for outdoor recreation, base camps, and severe weather backup where carrying separate cables and finding wall power are difficult.

Charging capability focuses on device versatility and simultaneous power sharing. The charger features a 5V/3A (15W) USB-C port that the manufacturer states can boost an iPhone from 15% to 60% in approximately 30 minutes, alongside two standard USB-A outputs and an integrated wireless charging pad. The system supports charging up to seven devices at the same time across its cables, ports, and wireless surface. Compatible phones include the iPhone 12 through iPhone 17 series as well as Samsung Galaxy S21 through S24 models. Buyers should understand that nominal battery capacity does not equal delivered energy to devices due to normal voltage conversion, thermal overhead, and cable resistance.

The build design emphasizes all-in-one convenience with an outdoor aesthetic. Measuring 6.38 by 3.43 by 1.57 inches, the unit combines a rugged black shell with high-visibility orange accents for quick locating in a backpack or survival tote. Rather than relying on a single small solar cell, it incorporates four fold-out solar panels that unfold to capture sunlight and snap securely against the casing for transport. Four built-in charging cables-USB-C, Phone, Micro-USB, and USB-A-tuck cleanly into molded grooves on the chassis, preventing cable tangles and ensuring support for both modern and legacy devices.

Daily operation and recharging depend on your power source and environment. While the quad-panel solar system is rated by the manufacturer to harvest energy up to five times faster than standard single-panel banks, portable solar charging remains an emergency and supplementary option rather than a quick replacement for grid electricity. For routine use, users should fully replenish the 48,000 mAh pack via wall adapter prior to leaving home, utilizing the solar panels to top off energy during sunny outdoor activities.

There are several realistic limitations buyers must consider before purchasing this model. At over 1.5 inches thick, this battery pack is noticeably bulky and unsuitable for everyday pocket carry or slim purse storage. In addition, its 48,000 mAh rating at typical 3.7V lithium-polymer voltage translates to roughly 177 Wh, which exceeds the standard 100 Wh limit set by the FAA and major international airlines for passenger carry-on bags. Furthermore, the 5V/3A charging ceiling provides standard smartphone fast charging but lacks the higher-wattage USB Power Delivery or PPS protocols required to power full-size laptops.

This solar portable charger is an outstanding choice for outdoor enthusiasts, tailgaters, road trippers, and families preparing home emergency storm kits who need high-capacity backup and total cable independence. Commuters seeking a lightweight pocket companion or air travelers needing a TSA-friendly flight charger should look toward smaller 10,000 mAh or 20,000 mAh battery packs. For off-grid resilience and multi-device camping convenience, the SOARAISE 48000mAh model offers exceptional utility in a durable package.

The SOARAISE 48000mAh Solar Power Bank delivers wide-ranging device connectivity designed to streamline mobile charging without requiring loose cords. The integrated cable array features dedicated USB-C, Phone, Micro-USB, and USB-A plugs, ensuring immediate compatibility with modern smartphones, older electronics, and rechargeable camping accessories.

Beyond the built-in cables, the power bank includes three dedicated ports: two USB-A output ports and a bidirectional USB-C input/output port rated up to 5V/3A. Together with the top-mounted wireless pad, the unit can distribute power to as many as seven connected devices simultaneously, functioning as a practical charging station for group outings and family trips.

Featuring four foldable high-efficiency solar panels, this portable charger captures sunlight up to five times faster than traditional single-panel solar banks according to manufacturer claims. The folding panel design unfolds quickly to maximize surface area under direct sun and folds flat against the body for easy packing.

While the solar panels provide valuable off-grid maintenance and emergency power during extended wilderness trips or power outages, natural solar charging speeds depend heavily on sunlight intensity and outdoor conditions. For best results, users should fully charge the battery via a wall charger before trips, using solar input to supplement power while off the grid.

The BLAVOR Solar Power Bank 20000mAh is a rugged, high-capacity portable power station designed for campers, hikers, road trippers, and home emergency kits. Instead of requiring users to manage a tangled bundle of loose cords and dedicated charging pucks, this unit integrates four built-in cables alongside open ports and a specialized wireless pad that supports both phones and Apple Watch hardware. It serves primarily as a heavy-duty portable charging hub for users who want complete self-contained convenience while away from standard wall outlets.

Charging capability centers around a listed 20,000 mAh nominal battery capacity and a 20W fast-charging USB-C port. The manufacturer estimates this stored energy can provide approximately 4 charges for an iPhone 17, 3.4 charges for a Galaxy S26, 2.7 charges for an iPad Mini 6, or up to 37 charges for an Apple Watch 11. Buyers should understand that nominal battery capacity does not equal delivered output due to typical voltage conversion losses and heat dissipation. Furthermore, while the manufacturer lists partial charges for a 14-inch MacBook Pro, the 20W maximum output means laptops will charge slowly and are best supported in low-power standby rather than during intensive computing tasks.

Build quality and physical design emphasize trail readiness and impact resistance. The shell combines flame-retardant ABS and PC plastics with protective silicone cushioning, giving it a solid feel with resistance against moisture, dust, and minor drops. At 7.28 by 3.85 by 1.5 inches and weighing roughly 1.72 pounds, this is a substantial piece of equipment built for backpacks and gear bins rather than pants pockets. Outdoor utility is enhanced by seven integrated tools, including a focused three-mode flashlight, a wide-angle camping lantern with three brightness levels, a signal light, an analog compass, an ambient thermometer, and a carabiner rope clip.

Day-to-day handling is straightforward thanks to molded cable channels that securely tuck away two USB-C connectors, one iOS connector, and one USB-A lead when not in use. The unit can be recharged through standard wall adapters using its input ports, or placed in direct sunlight for supplemental solar input. Because a small single solar panel generates modest current, solar charging should be viewed strictly as an off-grid backup method to keep essential electronics functioning during prolonged emergencies, while standard wall charging remains the primary way to replenish the 20,000 mAh pack before departure.

The primary limitations of this charger relate to physical heft and shared power distribution. Tipping the scales at over 1.7 pounds, it is considerably heavier than single-purpose pocket power banks. Additionally, while the system supports simultaneous charging for up to six devices, connecting multiple devices distributes available electrical current, meaning connected phones will charge at standard rates rather than maximum 20W speeds during heavy multi-device use.

For outdoor adventurers, family campers, and emergency preppers seeking an all-in-one charging station that handles phones, watches, and accessories without requiring separate cords, the BLAVOR 20000mAh Solar Charger offers outstanding practical utility. Commuters and everyday office workers looking for an ultra-slim, lightweight battery pack for a pocket or small handbag will be better served by a minimalist compact power bank. The strongest evidence-based reason to buy this model is its all-inclusive combination of integrated cables, Apple Watch wireless support, emergency lighting, and durable high-capacity backup power.

Connectivity is one of the standout features of the BLAVOR 20000mAh Solar Power Bank, offering simultaneous charging support for up to six individual devices. The unit includes four integrated cables: two USB-C leads, one iOS lead for Apple Lightning gear, and one USB-A lead, eliminating the need to search for extra cords in a tent or vehicle. In addition to the built-in cables, the housing provides three discrete ports (USB-C, USB-A, and iOS) to support external cables and varying charging preferences.

Wireless charging functionality adds further flexibility with dedicated placement for Qi-enabled smartphones and Apple Watch devices directly on the housing surface. Wired connections through the primary USB-C port supply up to 20W fast charging, which is capable of powering an iPhone 15 up to a full charge in roughly 50 minutes under optimal conditions according to manufacturer specifications. When powering multiple gadgets at the same time, available power is shared across connections, ensuring all connected accessories receive steady maintenance power.

Designed as an adventure-ready utility pack, this power bank includes seven distinct accessory functions that assist during power outages, hiking trips, and campsite setup. It incorporates two independent lighting systems: a focused flashlight featuring three operational modes for pathfinding and signaling, alongside a frosted camping lantern with three adjustable output levels to illuminate tents or work surfaces. An embedded compass and ambient thermometer provide quick environmental checks without draining internal battery reserves.

The integrated solar panel provides an auxiliary method to absorb sunlight and trickle charge the internal battery cells when off the electrical grid. While standard wall recharging via USB is necessary to fully restore 20,000 mAh in everyday scenarios, the solar panel provides an essential lifeline during prolonged outdoor stays or natural disasters. Combined with a rugged ABS, PC, and silicone chassis that protects internal circuits from shocks and weather, the device serves as a reliable emergency power foundation.