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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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Discover 2VRE-5900TG-48V OPzV Battery, 040-08316 Discover 2VRE-5900TG-48V OPzV Battery, 040-08316

Discover 2VRE-5900TG-48V OPzV Battery, 040-08316

List Price: $48,000.00
Our Price: $37,900.00
Save $10,100.00!
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: $31,900.00
Save $11,100.00!
Discover 2VRE-4400TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1782 AH AT 20 HR Discover 2VRE-4400TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1782 AH AT 20 HR

Discover 2VRE-4400TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1782 AH AT 20 HR, 040-08313

Our Price: $28,150.00
Discover 2VRE-3200TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1265 AH AT 20 HR Discover 2VRE-3200TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1265 AH AT 20 HR

Discover 2VRE-3200TG-48V, Opzv Gel Battery System, Rack, Cables, 48V, 1265 AH AT 20 HR, 040-08312

Our Price: $21,750.00
Discover 2VRE-5900TG-24V OPzV Battery, 040-08304 Discover 2VRE-5900TG-24V OPzV Battery, 040-08304

Discover 2VRE-5900TG-24V OPzV Battery, 040-08304

List Price: $26,000.00
Our Price: $19,950.00
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OutBack System-Edge SE-415PHI-300AFCI, 010-01043 OutBack System-Edge SE-415PHI-300AFCI, 010-01043

OutBack System-Edge SE-415PHI-300AFCI, 010-01043

List Price: $24,000.00
Our Price: $18,700.00
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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: $22,000.00
Our Price: $16,250.00
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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: $16,000.00
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Discover 2VRE-4400TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1782 AH AT 20 HR Discover 2VRE-4400TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1782 AH AT 20 HR

Discover 2VRE-4400TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1782 AH AT 20 HR, 040-08303

Our Price: $15,750.00
OutBack System-Edge SE-530BLU-SBX, 010-01078 OutBack System-Edge SE-530BLU-SBX, 010-01078

OutBack System-Edge SE-530BLU-SBX, 010-01078

List Price: $18,000.00
Our Price: $13,400.00
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Discover 2VRE-3200TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1265 AH AT 20 HR Discover 2VRE-3200TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1265 AH AT 20 HR

Discover 2VRE-3200TG-24V, Opzv Gel Battery System, Rack, Cables, 24V, 1265 AH AT 20 HR, 040-08302

Our Price: $11,900.00
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: $15,000.00
Our Price: $10,900.00
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OutBack System-Edge SE-320BLU, 010-01041 OutBack System-Edge SE-320BLU, 010-01041

OutBack System-Edge SE-320BLU, 010-01041

List Price: $13,000.00
Our Price: $9,800.00
Save $3,200.00!
Solar-One Battery with HUP, SO-6-125-33, 12V, 2490 AH AT 20HR Solar-One Battery with HUP, SO-6-125-33, 12V, 2490 AH AT 20HR

Solar-One Battery with HUP, SO-6-125-33, 12V, 2490 AH AT 20HR, 040-05296

Our Price: $6,975.00
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: $9,206.44
Our Price: $6,650.00
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SO-6-100-33, Solar-One Battery, HuP Technology, 12V, 1990AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1990AH / 20HR, SO-6-100-33, Northwest Energy Storage

SO-6-100-33, Solar-One Battery, HuP Technology, 12V, 1990AH / 20HR,, 040-05295

List Price: $6,800.00
Our Price: $6,075.00
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SO-6-85-33, Solar-One Battery, HuP Technology, 12V, 1690AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1690AH / 20HR, SO-6-85-33, Northwest Energy Storage

SO-6-85-33, Solar-One Battery, HuP Technology, 12V, 1690AH / 20HR,, 040-05293-A

List Price: $5,800.00
Our Price: $5,475.00
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SO-6-85-31, Solar-One Battery, HuP Technology, 12V, 1585AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1585AH / 20HR, SO-6-85-31, Northwest Energy Storage

SO-6-85-31, Solar-One Battery, HuP Technology, 12V, 1585AH / 20HR,, 040-05290-A

List Price: $5,700.00
Our Price: $5,275.00
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SO-6-85-27, Solar-One Battery, HuP Technology, 12V, 1375AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1375AH / 20HR, SO-6-85-27, Northwest Energy Storage

SO-6-85-27, Solar-One Battery, HuP Technology, 12V, 1375AH / 20HR,, 040-05284-A

List Price: $4,600.00
Our Price: $4,275.00
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SO-6-85-25, Solar-One Battery, HuP Technology, 12V, 1270AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1270AH / 20HR, SO-6-85-25, Northwest Energy Storage

SO-6-85-25, Solar-One Battery, HuP Technology, 12V, 1270AH / 20HR,, 040-05281-A

List Price: $4,400.00
Our Price: $4,175.00
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SO-6-85-23, Solar-One Battery, HuP Technology, 12V, 1160AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1160AH / 20HR, SO-6-85-23, Northwest Energy Storage

SO-6-85-23, Solar-One Battery, HuP Technology, 12V, 1160AH / 20HR,, 040-05278-A

List Price: $4,250.00
Our Price: $3,975.00
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Discover, AES Lithium Ion Bbattery 24, XANBUS V, 44-24-2800 Discover, AES Lithium Ion Bbattery 24, XANBUS V, 44-24-2800

Discover, AES Lithium Ion Bbattery 24, XANBUS V, 44-24-2800, 040-12002

List Price: $4,615.53
Our Price: $3,675.00
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SO-6-85-21, Solar-One Battery, HuP Technology, 12V, 1055AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 1055AH / 20HR, SO-6-85-21, Northwest Energy Storage

SO-6-85-21, Solar-One Battery, HuP Technology, 12V, 1055AH / 20HR,, 040-05275-A

List Price: $3,800.00
Our Price: $3,475.00
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SO-6-85-19, Solar-One Battery, HuP Technology, 12V, 950AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 950AH / 20HR, SO-6-85-19, Northwest Energy Storage

SO-6-85-19, Solar-One Battery, HuP Technology, 12V, 950AH / 20HR,, 040-05272-A

List Price: $3,600.00
Our Price: $3,275.00
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SO-6-85-17, Solar-One Battery, HuP Technology, 12V, 845AH / 20HR, Northwest Energy Storage Solar-One Battery, HuP Technology, 12V, 845AH / 20HR, SO-6-85-17, Northwest Energy Storage

SO-6-85-17, Solar-One Battery, HuP Technology, 12V, 845AH / 20HR,, 040-05269-A

List Price: $3,200.00
Our Price: $3,175.00
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3AVR95-33, Deka Unigy II SpaceSaver SLA Battery, 6V, 1807AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1807AH @20 HR RATE, 3AVR95-33, East Penn

3AVR95-33, Deka Unigy II SpaceSaver SLA Battery, 6V, 1807AH @20 HR RATE, East Penn, 040-06037-NL

List Price: $4,505.00
Our Price: $2,900.00
Save $1,605.00!
3AVR95-31, Deka Unigy II SpaceSaver SLA Battery, 6V, 1694.1AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1694.1AH @20 HR RATE, 3AVR95-31, East Penn

3AVR95-31, Deka Unigy II SpaceSaver SLA Battery, 6V, 1694.1AH @20 HR RATE, East Penn, 040-06036-NL

List Price: $4,345.00
Our Price: $2,800.00
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Generac APKE00007 PWRcell Battery Cabinet, 040-06101 Generac APKE00007 PWRcell Battery Cabinet, 040-06101

Generac APKE00007 PWRcell Battery Cabinet, 040-06101

List Price: $2,900.00
Our Price: $2,725.00
Save $175.00!
3AVR95-29, Deka Unigy II SpaceSaver SLA Battery, 6V, 1581.1AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1581.1AH @20 HR RATE, 3AVR95-29, East Penn

3AVR95-29, Deka Unigy II SpaceSaver SLA Battery, 6V, 1581.1AH @20 HR RATE, East Penn, 040-06035-NL

List Price: $4,005.00
Our Price: $2,700.00
Save $1,305.00!
East Penn, UNIGY II 2AVR125-33-IL, AGM Battery, 4V, 2367 AH AT 20 HR, Interlock East Penn, UNIGY II 2AVR125-33-IL, AGM Battery, 4V, 2367 AH AT 20 HR, Interlock

East Penn, UNIGY II 2AVR125-33-IL, AGM Battery, 4V, 2367 AH AT 20 HR, Interlock, 040-06038-IL

Our Price: $2,500.00