2.5-5.4kWh Batteries

Essential-backup 2.5-5.4kWh lithium batteries and rack modules from EG4, Fortress Power, Pytes, SimpliPhi and MK Battery. Start small and stack more capacity later.

All brands →Buying guides:What Is a Battery Energy Storage System?

110 products

Top Sellers — Market Front-Runners The same Tier-1 lines as the big national players · live PES pricing
Top SellerTrina Solar Vertex N 600W N-Type TOPCon Commercial ModuleTrina Solar Trina Solar Vertex N 600W N-Type TOPCon Commercial Module $158.06 $0.26/W · 600WAvailable to orderLead time confirmed at checkoutTop SellerZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline Solar PanelZNShine ZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline... $136.86 $0.34/W · 400WIn stockShips in 1–2 business daysTop SellerZNShine Solar 405W 108-Cell Solar PanelZNShine ZNShine Solar 405W 108-Cell Solar Panel $147.61 $0.36/W · 405WAvailable to orderLead time confirmed at checkoutLONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial ModuleLONGi LONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial Mo... $161.29 $0.27/W · 600WAvailable to orderLead time confirmed at checkoutJinko Tiger Neo N-Type 600W Bifacial TOPCon Solar PanelJinko Solar Jinko Tiger Neo N-Type 600W Bifacial TOPCon Solar Panel $164.52 $0.27/W · 600WAvailable to orderLead time confirmed at checkoutCanadian Solar HiKu6 395W Mono Solar Panel - CS6R-395MS-HLCanadian Solar Canadian Solar HiKu6 395W Mono Solar Panel - CS6R-395MS-HL $162.00 $0.41/W · 395WAvailable to orderLead time confirmed at checkoutHyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar PanelHyundai Energy Solutions Hyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar P... $167.76 $0.41/W · 410WAvailable to orderLead time confirmed at checkoutTalesun TM7G54M-450 450W Bifacial Solar PanelTalesun Talesun TM7G54M-450 450W Bifacial Solar Panel $185.63 $0.41/W · 450WAvailable to orderLead time confirmed at checkoutAptos Solar DNA-120-BF10-440W 440W Bifacial Solar PanelAptos Aptos Solar DNA-120-BF10-440W 440W Bifacial Solar Panel $185.92 $0.42/W · 440WAvailable to orderLead time confirmed at checkoutJA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell BifacialJA Solar JA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell ... $262.79 Available to orderLead time confirmed at checkout
  • EndurEnergy ESP-R12-E Battery Rack Enclosure (65kWh)

    EndurEnergy ESP-R12-E Battery Rack Enclosure (65kWh)

    EndurEnergy Systems
    $1,656.43 USD
    $1,656.43 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Envy12KW-eVault bundle

    Fortress Power Envy 12kW + eVault Max 18.5kWh Bundle

    Fortress Power
    $15,748.53 USD
    $15,748.53 USD
    $851/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • SIMPLIPHI SPHI-B-4.9 4.9KWH LITHIUM IRON PHOSPATE BATTERY

    SIMPLIPHI SPHI-B-4.9 4.9KWH LITHIUM IRON PHOSPATE BATTERY

    SimpliPhi
    $4,184.50 USD
    $4,184.50 USD
    $854/kWh
    In stock
    Ships in 1–2 business days
    In Stock
  • Sonnen ECOLX12SS-15 8.0KW Energy Storage System (12.0kwh Capacity)

    Sonnen ECOLX12SS-15 8.0KW Energy Storage System (12.0kwh Capacity)

    sonnen
    $34,778.56 USD
    $34,778.56 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Sonnen ECOLX12SC-15 8.0KW Energy Storage System (12.0kwh Capacity), Ca Model

    Sonnen ECOLX12SC-15 8.0KW Energy Storage System (12.0kwh Capacity), Ca Model

    sonnen
    $32,408.00 USD
    $32,408.00 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • SimpliPhi Battery Cabinet (for 6 - 3.8KwH Batteries) BOSS.6

    SimpliPhi Battery Cabinet (for 6 - 3.8KwH Batteries) BOSS.6

    SimpliPhi
    $2,743.12 USD
    $2,743.12 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Rubix 5.12kWh Battery 48 Volt | 100Ah Stack Series Lithium LifePO4 Battery RS-48100

    Rubix 5.12kWh Battery 48 Volt | 100Ah Stack Series Lithium LifePO4 Battery RS-48100

    Rubix Battery
    $1,670.49 USD
    $1,670.49 USD
    $326/kWh
    In stock
    Ships in 1–2 business days
    In Stock
  • Rubix 10.5kWh Battery 48 Volt 205 AH Giga Stack Series Lithium RGS-51200

    Rubix 10.5kWh Battery 48 Volt 205 AH Giga Stack Series Lithium RGS-51200

    Rubix Battery
    $2,394.59 USD
    $2,394.59 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Rubix Battery 5.12kWh 48 Volt 100 AH Giga Stack Series Lithium LiFePO₄ Battery RGS-51100

    Rubix Battery 5.12kWh 48 Volt 100 AH Giga Stack Series Lithium LiFePO₄ Battery RGS-51100

    Rubix Battery
    $1,262.06 USD
    $1,262.06 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Renon 5.12kWh High Voltage Stackable Lithium Battery Xtreme HV 1.0 XTREMEHVS5K

    Renon 5.12kWh High Voltage Stackable Lithium Battery Xtreme HV 1.0 XTREMEHVS5K

    Renon
    $2,001.95 USD
    $2,001.95 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • Renon 5.12kWh 48 Volt Stackable Lithium Battery (LiFePO4) XTREMELVS5K

    Renon 5.12kWh 48 Volt Stackable Lithium Battery (LiFePO4) XTREMELVS5K

    Renon
    $1,585.55 USD
    $1,585.55 USD
    In stock
    Ships in 1–2 business days
    In Stock
  • SimpliPhi 105kWh Rack-Mount Battery Module

    SimpliPhi 105kWh Rack-Mount Battery Module

    SimpliPhi
    $39,839.93 USD
    $39,839.93 USD
    $379/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Rolls Battery 125kWh Lithium Battery Pack

    Rolls Battery 125kWh Lithium Battery Pack

    Rolls Battery
    $49,667.01 USD
    $49,667.01 USD
    $397/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Sol-Ark 25kWh LFP Home Battery

    Sol-Ark 25kWh LFP Home Battery

    Sol-Ark
    $5,503.03 USD
    $5,503.03 USD
    $220/kWh
    Available to order
    Ships in 10-15 business days
    In Stock
  • RELiON 195kWh Lithium Battery Pack

    RELiON 195kWh Lithium Battery Pack

    RELiON
    $67,426.37 USD
    $67,426.37 USD
    $346/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Tigo 9.5kWh Battery with Enclosure (3 Modules)

    Tigo 9.5kWh Battery with Enclosure (3 Modules)

    Tigo Energy
    $8,213.06 USD
    $8,213.06 USD
    $865/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Pytes V5 5.12kWh 51.2V 100Ah Lithium Iron Phosphate Battery- V5 Battery

    Pytes V5 5.12kWh 51.2V 100Ah Lithium Iron Phosphate Battery- V5 Battery

    Pytes
    $1,450.00 USD
    $1,450.00 USD
    $283/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Storz 5.12kWh Lithium Battery – 10247

    Storz 5.12kWh Lithium Battery – 10247

    Storz Power
    $4,989.51 USD
    $4,989.51 USD
    $975/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Simpliphi ExprESS 7.6 (2x PHI 3.8kWh @ 48V)- with Magnum 4448PAE Inverter & PT100 MPPT Charge Controller E-2PHI-48-60

    Simpliphi ExprESS 7.6 (2x PHI 3.8kWh @ 48V)- with Magnum 4448PAE Inverter & PT100 MPPT Charge Controller E-2PHI-48-60

    SimpliPhi
    $12,827.85 USD
    $12,827.85 USD
    Legacy Model
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow 15kWhRept A+ low-voltage battery pack of 5.12 kWh x 3 - RBmax5.1L4 — front view

    Roypow 15kWhRept A+ low-voltage battery pack of 5.12 kWh x 3 - RBmax5.1L4

    Roypow
    $5,367.60 USD
    $5,367.60 USD
    $1048/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow 15kWhRept A+ low-voltage battery pack of 5.12 kWh x 3 - RBmax5.1L3

    Roypow 15kWhRept A+ low-voltage battery pack of 5.12 kWh x 3 - RBmax5.1L3

    Roypow
    $4,062.98 USD
    $4,062.98 USD
    $794/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow ESS includes 10KW Hybrid inverter and 15.3KWH LiFePO4 Battery pack of 3 RBmax 5.1H Batteries - SUN10000S-U/A-3

    Roypow ESS includes 10KW Hybrid inverter and 15.3KWH LiFePO4 Battery pack of 3 RBmax 5.1H Batteries - SUN10000S-U/A-3

    Roypow
    $12,070.00 USD
    $12,070.00 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow ESS includes 15KW Hybrid inverter and 15.3KWH LiFePO4 Battery pack of 3 RBmax 5.1H Batteries - SUN15000S-U/A-3

    Roypow ESS includes 15KW Hybrid inverter and 15.3KWH LiFePO4 Battery pack of 3 RBmax 5.1H Batteries - SUN15000S-U/A-3

    Roypow
    $12,247.50 USD
    $12,247.50 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow ESS includes 15KW Hybrid inverter and 25.5KWH LiFePO4 Battery pack of 5 RBmax 5.1H Batteries - SUN15000S-U/A-5

    Roypow ESS includes 15KW Hybrid inverter and 25.5KWH LiFePO4 Battery pack of 5 RBmax 5.1H Batteries - SUN15000S-U/A-5

    Roypow
    $14,377.50 USD
    $14,377.50 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow 5kWh Rack-mount battery Rept A+ battery - RBmax5.1L-FX- A

    Roypow 5kWh Rack-mount battery Rept A+ battery - RBmax5.1L-FX- A

    Roypow
    $1,093.40 USD
    $1,093.40 USD
    $219/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow 5kWh Home wall-mount storage battery pack (with screen) - RBmax5.1L-FA

    Roypow 5kWh Home wall-mount storage battery pack (with screen) - RBmax5.1L-FA

    Roypow
    $1,113.28 USD
    $1,113.28 USD
    $223/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Roypow RBmax5.1L-F 5kWh Home wall-mount storage battery pack

    Roypow RBmax5.1L-F 5kWh Home wall-mount storage battery pack

    Roypow
    $1,093.40 USD
    $1,093.40 USD
    $219/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Renon 5.12kWh Energy Storage System - Xcellent — side angle

    Renon 5.12kWh Energy Storage System - Xcellent

    Renon
    $2,482.13 USD
    $2,482.13 USD
    $485/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Briggs and Stratton PHI-3.8-48-M

    Simpliphi 3.8KWH Lithium Iron Phospate Battery (White Metal Case) - PHI-3.8-48-M

    SimpliPhi
    $2,462.83 USD
    $2,462.83 USD
    $648/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Sonnen 2.0KWH Lithium Iron Phospate Battery - ECOLXBATT — front view

    Sonnen 2.0KWH Lithium Iron Phospate Battery - ECOLXBATT

    sonnen
    $4,473.73 USD
    $4,473.73 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Simpliphi AccESS 15.2 (4x PHI 3.8kWh @48V) - with 6.8kW XW PR - A-4PHI-CC-SCH-PRO — side angle

    Simpliphi AccESS 15.2 (4x PHI 3.8kWh @48V) - with 6.8kW XW PR - A-4PHI-CC-SCH-PRO

    SimpliPhi
    $17,196.29 USD
    $17,196.29 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Simpliphi AccESS 15.2 (4x PHI 3.8kWh @48V) - with 6.8kW XW PRO I - A-4PHI-SCH-PRO — side angle

    Simpliphi AccESS 15.2 (4x PHI 3.8kWh @48V) - with 6.8kW XW PRO I - A-4PHI-SCH-PRO

    SimpliPhi
    $15,859.43 USD
    $15,859.43 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • SimpliPhi Briggs and Stratton AccESS 15.2 (4x PHI 3.8kWh @48V) - with 12kW Inverter & Integrated Charge Controllers…

    SimpliPhi Briggs and Stratton AccESS 15.2 (4x PHI 3.8kWh @48V) - with 12kW Inverter & Integrated Charge Controllers - A-4PHI-SA-12

    SimpliPhi
    $19,850.25 USD
    $19,850.25 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 15kWh Kit — Best Tier

    Battery Backup 15kWh Kit — Best Tier

    PES System Kits
    $61,084.47 USD
    $61,084.47 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 15kWh Kit — Better Tier

    Battery Backup 15kWh Kit — Better Tier

    PES System Kits
    $28,883.00 USD
    $28,883.00 USD
    $1926/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 15kWh Kit — Good Tier

    Battery Backup 15kWh Kit — Good Tier

    PES System Kits
    $6,100.13 USD
    $6,100.13 USD
    $407/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 5kWh Kit — Best Tier

    Battery Backup 5kWh Kit — Best Tier

    PES System Kits
    $21,207.71 USD
    $21,207.71 USD
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 5kWh Kit — Better Tier

    Battery Backup 5kWh Kit — Better Tier

    PES System Kits
    $4,757.58 USD
    $4,757.58 USD
    $952/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Battery Backup 5kWh Kit — Good Tier

    Battery Backup 5kWh Kit — Good Tier

    PES System Kits
    $2,766.57 USD
    $2,766.57 USD
    $553/kWh
    Available to order
    Lead time confirmed at checkout
    In Stock
  • Growatt ALP 5.0L-E2-US 5kWh 48V LFP battery module — front view

    Growatt ALP 5.0L-E2-US 5kWh LV LFP Battery Module (48V)

    Sale
    Growatt
    $1,477.00 USD
    $1,624.00 USD $1,477.00 USD
    -9%
    $295/kWh
    Available to order
    Ships in 5–10 business days
    SaleIn Stock
  • Growatt APX 5.0P-B1 US 5kWh HV LFP battery module — front view

    Growatt APX 5.0P-B1 US 5kWh HV LFP Battery Module

    Sale
    Growatt
    $1,618.00 USD
    $1,778.00 USD $1,618.00 USD
    -9%
    $324/kWh
    Available to order
    Ships in 5–10 business days
    SaleIn Stock
  • Deye 5.12 kWh LiFePO₄ Stackable Battery for Residential Energy Storage SE-G5.1PRO-B

    Deye SE-G5.1PRO-B 5.12kWh Stackable LFP Battery

    Sold Out — Call or Email
    Deye
    $1,096.99 USD
    $1,196.00 USD $1,096.99 USD
    -8%
    Out of stock
    Call Now
    Sold Out — Call or Email
  • Soluna 15kWh HV LFP Battery

    Soluna 15kWh HV LFP Battery

    Sold Out — Call or Email
    Soluna
    $4,987.49 USD
    $4,987.00 USD $4,987.49 USD
    $332/kWh
    Out of stock
    Call Now
    Sold Out — Call or Email
  • RX-LFP48100 – 51.2V 100Ah 5.12kWh Server Rack Battery

    RX-LFP48100 – 51.2V 100Ah 5.12kWh Server Rack Battery

    Sold Out — Call or Email
    ruixu
    $1,056.00 USD
    $1,039.00 USD $1,056.00 USD
    $206/kWh
    Out of stock
    Call Now
    Sold Out — Call or Email
  • RX-LFP48100-H – 51.2V 100Ah 5.12kWh Self-Heating Battery

    RX-LFP48100-H – 51.2V 100Ah 5.12kWh Self-Heating Battery

    Sold Out — Call or Email
    ruixu
    $1,056.00 USD
    $1,044.05 USD $1,056.00 USD
    $206/kWh
    Out of stock
    Call Now
    Sold Out — Call or Email
  • Pytes E-Box 48100R 5.12kWh Battery Module

    Pytes 5.12kWh 51.2 Volt 100 Ah E-Box 48100R Lithium Battery Module

    Sold Out — Call or Email
    Pytes
    $1,296.00 USD
    $1,299.00 USD $1,296.00 USD
    $253/kWh
    Out of stock
    Call Now
    Sold Out — Call or Email
  • Product image — PES Supply

    32.4kWh Fortress Battery Bank 48VDC LFP

    Sold Out — Call or Email
    Fortress Power
    $26,760.26 USD
    $26,827.33 USD $26,760.26 USD
    $826/kWh
    Out of stock
    Call Now
    Sold Out — Call or Email
  • Milwaukee 3300R ROLL-ON PACKOUT Power Station

    Milwaukee 3300R ROLL-ON PACKOUT 7200W/3600W 2.5kWh Battery Station Power Supply

    Sold Out — Call or Email
    milwaukee
    $5,496.00 USD
    $5,499.00 USD $5,496.00 USD
    Out of stock
    Call Now
    Sold Out — Call or Email

About 2.5-5.4kWh Batteries

Essential-backup 2.5-5.4kWh lithium batteries and rack modules from EG4, Fortress Power, Pytes, SimpliPhi and MK Battery. Start small and stack more capacity later.