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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
Save $5,000.00!
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
Save $1,700.00!
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
Save $1,800.00!
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: $18,000.00
Our Price: $16,150.00
Save $1,850.00!
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: $6,800.00
Save $2,406.44!
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
Save $725.00!
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
Save $325.00!
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
Save $425.00!
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
Save $325.00!
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
Our Price: $4,175.00
Save $5,031.44!
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
Save $225.00!
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
Save $275.00!
Deka Duration DD5300 Lithium (LiFePO4) Solar Battery 040-13100 Deka Duration DD5300 Lithium (LiFePO4) Solar Battery 040-13100

Deka Duration DD5300 Lithium (LiFePO4) Solar Battery 040-13100

List Price: $5,700.00
Our Price: $3,700.00
Save $2,000.00!
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
Save $325.00!
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: $3,425.00
Save $1,080.00!
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: $3,300.00
Save $1,045.00!
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
Save $325.00!
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
Save $25.00!
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: $3,165.00
Save $840.00!
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: $2,950.00
Save $1,300.00!
3AVR95-27, Deka Unigy II SpaceSaver SLA Battery, 6V, 1468.2AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1468.2AH @20 HR RATE, 3AVR95-27, East Penn

3AVR95-27, Deka Unigy II SpaceSaver SLA Battery, 6V, 1468.2AH @20 HR RATE, East Penn, 040-06034-NL

List Price: $3,795.00
Our Price: $2,885.00
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3AVR95-25, Deka Unigy II SpaceSaver SLA Battery, 6V, 1355.3AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1355.3AH @20 HR RATE, 3AVR95-25, East Penn

3AVR95-25, Deka Unigy II SpaceSaver SLA Battery, 6V, 1355.3AH @20 HR RATE, East Penn, 040-06033-NL

List Price: $3,610.00
Our Price: $2,745.00
Save $865.00!
Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only) 040-14007-ITC26 Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only) 040-14007-ITC26

Enphase B03-T01-US00-1-3 IQ Battery 3T Base Unit (Battery only) 040-14007-ITC26

List Price: $3,900.00
Our Price: $2,700.00
Save $1,200.00!
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: $2,630.00
3AVR95-23, Deka Unigy II SpaceSaver SLA Battery, 6V, 1242.3AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1242.3AH @20 HR RATE, 3AVR95-23, East Penn

3AVR95-23, Deka Unigy II SpaceSaver SLA Battery, 6V, 1242.3AH @20 HR RATE, East Penn, 040-06032-NL

List Price: $3,435.00
Our Price: $2,615.00
Save $820.00!
3AVR95-21, Deka Unigy II SpaceSaver SLA Battery, 6V, 1129.4AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1129.4AH @20 HR RATE, 3AVR95-21, East Penn

3AVR95-21, Deka Unigy II SpaceSaver SLA Battery, 6V, 1129.4AH @20 HR RATE, East Penn, 040-06031-NL

List Price: $3,268.00
Our Price: $2,490.00
Save $778.00!
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

Our Price: $2,400.00
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

Our Price: $2,400.00
3AVR95-19, Deka Unigy II SpaceSaver SLA Battery, 6V, 1016.4AH @20 HR RATE, East Penn Deka Unigy II SpaceSaver SLA Battery, 6V, 1016.4AH @20 HR RATE, 3AVR95-19, East Penn

3AVR95-19, Deka Unigy II SpaceSaver SLA Battery, 6V, 1016.4AH @20 HR RATE, East Penn, 040-06030-NL

List Price: $3,068.00
Our Price: $2,340.00
Save $728.00!