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Virtually all power generation systems require some form of energy storage. For grid-tied systems, the utility accepts surplus power and gives it back when needed. A battery bank is required for systems that need to function without the grid, either all of the time or during an outage. In these systems, the solar array or wind turbine charges the batteries whenever they are producing power, and the batteries supply power whenever it is needed. The most common battery technology used for renewable energy systems is lead-acid, in which lead plates are submerged in sulfuric acid. Lead-acid batteries (while bulky) are relatively inexpensive and readily available compared to other battery types.
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OutBack System-Edge SE-860XLC-300AFCI, 010-01048 OutBack System-Edge SE-860XLC-300AFCI, 010-01048

OutBack System-Edge SE-860XLC-300AFCI, 010-01048

List Price: $43,000.00
Our Price: $38,000.00
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OutBack System-Edge SE-830PLR-300AFCI, 010-01047 OutBack System-Edge SE-830PLR-300AFCI, 010-01047

OutBack System-Edge SE-830PLR-300AFCI, 010-01047

List Price: $23,000.00
Our Price: $21,300.00
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OutBack System-Edge SE-830BLU-300AFCI, 010-01027 OutBack System-Edge SE-830BLU-300AFCI, 010-01027

OutBack System-Edge SE-830BLU-300AFCI, 010-01027

List Price: $23,000.00
Our Price: $21,200.00
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OutBack System-Edge SE-420BLU-300AFCI, 4,000 Watt Grid-Tie and Off-Grid Energy System, 010-01026 OutBack System-Edge SE-420BLU-300AFCI, 4,000 Watt Grid-Tie and Off-Grid Energy System, 010-01026

OutBack System-Edge SE-420BLU-300AFCI, 4,000 Watt Grid-Tie and Off-Grid Energy System, 010-01026

List Price: $18,000.00
Our Price: $16,150.00
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Discover, AES Lithium Ion Bbattery 48V, XANBUS, 42-48-6650 Discover, AES Lithium Ion Bbattery 48V, XANBUS, 42-48-6650

Discover, AES Lithium Ion Bbattery 48V, XANBUS, 42-48-6650, 040-12000

List Price: $6,000.00
Our Price: $5,150.00
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IBR-3-48-175, Integrated Battery Rack, Outback Integrated Battery Rack, IBR-3-48-175, Outback

IBR-3-48-175, Integrated Battery Rack, Outback, 048-03000

List Price: $3,000.00
Our Price: $2,600.00
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Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only) Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only)

Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only)

List Price: $3,900.00
Our Price: $2,445.00
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Enphase ENCHARGE-3T-1P-NA 3.36 kWh & 1.28 kVA Energy Storage System 040-14002-ITC26 Enphase ENCHARGE-3T-1P-NA 3.36 kWh & 1.28 kVA Energy Storage System 040-14002-ITC26

Enphase ENCHARGE-3T-1P-NA 3.36 kWh & 1.28 kVA Energy Storage System 040-14002-ITC26

List Price: $4,250.00
Our Price: $2,300.00
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Discover AES  LiFePO4 Lithium Ion Battery 48V,  LYNK Gateway, 44-48-3000 Discover AES LiFePO4 Lithium Ion Battery 48V, LYNK Gateway, 44-48-3000

Discover AES  LiFePO4 Lithium Ion Battery 48V,  LYNK Gateway, 44-48-3000

List Price: $9,206.44
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IBR-2-48-175, Integrated Battery Rack, Outback Pow Integrated Battery Rack, IBR-2-48-175

IBR-2-48-175, Integrated Battery Rack, Outback Power, 048-03001

List Price: $2,150.00
Our Price: $1,850.00
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MNBE-D, Battery Enclosure, Locking Door, MidNite Solar MNBE-D, Battery Enclosure, Locking Door, 8 x Group 30/GC2, MidNite Solar

MNBE-D, Battery Enclosure, Locking Door, MidNite Solar, 048-05506

List Price: $1,150.00
Our Price: $890.00
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OutBack NorthStar BLUE+ Battery, 12V,  NSB210FT BLUE+ OutBack NorthStar BLUE+ Battery, 12V, NSB210FT BLUE+

OutBack NorthStar BLUE+ Battery, 12V,  NSB210FT BLUE+

List Price: $885.00
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OutBack NorthStar BLUE+ Battery, 12V,  NSB190FT BLUE+ OutBack NorthStar BLUE+ Battery, 12V, NSB190FT BLUE+

OutBack NorthStar BLUE+ Battery, 12V,  NSB190FT BLUE+

List Price: $850.00
Our Price: $725.00
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OutBack NorthStar BLUE+ Battery, 12V,  NSB170FT BLUE+ OutBack NorthStar BLUE+ Battery, 12V, NSB170FT BLUE+

OutBack NorthStar BLUE+ Battery, 12V,  NSB170FT BLUE+

List Price: $775.00
Our Price: $700.00
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Enphase B10T-C-1290-O IQ Battery 10T Cover (No battery) Enphase B10T-C-1290-O IQ Battery 10T Cover (No battery)

Enphase B10T-C-1290-O IQ Battery 10T Cover (No battery)

List Price: $975.00
Our Price: $575.00
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OutBack NorthStar BLUE+ Battery, 12V,  NSB100FT BLUE+ OutBack NorthStar BLUE+ Battery, 12V, NSB100FT BLUE+

OutBack NorthStar BLUE+ Battery, 12V,  NSB100FT BLUE+

List Price: $525.00
Our Price: $500.00
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Discover Bracket for AES 42-48-6650 Battery BKT-6650 Discover Bracket for AES 42-48-6650 Battery BKT-6650

Discover Bracket for AES 42-48-6650 Battery BKT-6650

List Price: $250.00
Our Price: $220.00
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Enphase  B03-C-0350-O IQ Battery 3T Cover (No battery) Enphase B03-C-0350-O IQ Battery 3T Cover (No battery)

Enphase  B03-C-0350-O IQ Battery 3T Cover (No battery)

List Price: $320.00
Our Price: $215.00
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Discover AES Wall bracket 950-0023 for AES-44-48-3000 battery 040-12009 Discover AES Wall bracket 950-0023 for AES-44-48-3000 battery 040-12009

Discover AES Wall bracket 950-0023 for AES-44-48-3000 battery 040-12009

List Price: $215.00
Our Price: $200.00
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Enphase B03T-C-0430-O  IQ Battery 3T Cover (No battery) 	040-14008-ITC26 Enphase B03T-C-0430-O IQ Battery 3T Cover (No battery) 040-14008-ITC26

Enphase B03T-C-0430-O  IQ Battery 3T Cover (No battery) 040-14008-ITC26

List Price: $320.00
Our Price: $190.00
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Enphase ENCHARGE-HNDL-R1 IQ Battery Lifting Handle 094-10008 Enphase ENCHARGE-HNDL-R1 IQ Battery Lifting Handle 094-10008

Enphase ENCHARGE-HNDL-R1 IQ Battery Lifting Handle 094-10008

List Price: $155.00
Our Price: $145.00
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power-vent-48, Zephyr Power Vent, Battery Box Fan, 48V, Zephyr Industries Zephyr Power Vent, Battery Box Fan, 48V, power-vent-48, Zephyr Industries

Zephyr Power Vent, Battery Box Fan, 48V, power-vent-48, Zephyr Industries, 085-08209

List Price: $134.00
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power-vent-24, Zephyr Power Vent, Battery Box Fan, 24V, Zephyr Industries Zephyr Power Vent, Battery Box Fan, 24V, power-vent-24, Zephyr Industries

Zephyr Power Vent, Battery Box Fan, 24V, power-vent-24, Zephyr Industries, 085-08207

List Price: $94.00
Our Price: $105.00
MN-Shelf, Extra shelf, MNBE-C, MNBE-D, or MNBE-E, MidNite Solar Extra shelf for MNBE-C, MNBE-D, or MNBE-E, MN-Shelf, MidNite Solar

MN-Shelf, Extra shelf for MNBE-C, MNBE-D, or MNBE-E, MidNite Solar, 048-05520

List Price: $89.00
Our Price: $105.00
power-vent-12, Zephyr Power Vent, Battery Box Fan, 12V, Zephyr Industries Zephyr Power Vent, Battery Box Fan, 12V, power-vent-12, Zephyr Industries

Zephyr Power Vent, Battery Box Fan, 12V, power-vent-12, Zephyr Industries, 085-08205

List Price: $94.00
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Water Miser 2000-PH Battery Cap 040-09913 Water Miser 2000-PH Battery Cap 040-09913

Water Miser 2000-PH Battery Cap 040-09913

List Price: $10.00
Our Price: $7.00
Save $3.00!