Off-grid solar battery systems will be deeply cycled and regularly operated in a partial state of charge (PSOC) condition. Off-grid batteries should charge efficiently so as not to waste valuable energy generated by the solar array or a diesel generator. Off-grid batteries need high power capability to support the high surge draw, discharge and charge current of off-grid inverter chargers. Access to off-grid sites is not always easy, so a maintenance-free battery is highly desirable. High and low temperatures need to be considered, as this will affect the useful lifetime of the chosen battery. State of Charge (SoC) monitoring is critical for off-grid users and systems which rely on accurate battery SoC for functional operation.

Lithium Solutions
  • Lowest total lifetime cost
  • LiFePO4 cell technology
  • Recommended useable capacity 100%
  • Partial State of Charge use recommended
  • ≧10-year daily cycle design life at 100% DoD
  • Unlimited cycle energy throughput warranty
  • Ultra-fast charging profile
  • >98% high charge rate efficiency
  • >95% average life-time round-trip efficiency
  • Less solar charge time to full charge
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Lead-Acid Solutions
  • Lower to medium up-front cost
  • Flat plate and tubular plate technologies
  • Recommended useable capacity 50%
  • Partial State of Charge use decreases life
  • ≦5-year daily cycle design life at 50% DOD
  • Prorated manufactures defect warranty
  • Slow charging profile
  • <80% high charge rate efficiency
  • <65% average life-time round-trip efficiency
  • Requires >35% more solar charge time
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Lithium Solutions

Lithium AES LiFePO4

Manufactured with the highest-grade deep-cycle high-energy lithium LiFePO4 cells, a proprietary high peak surge, and transient voltage hardened BMS. Discover Advanced Energy System (AES) LiFePO4 batteries for off-grid installations offer bankable performance and the lowest cost of energy storage per kWh. AES LiFePO4 batteries are maintenance-free, deliver up to 100% depth of discharge, and 99% round-trip efficiency, and are backed by an unlimited cycle 10-year energy throughput warranty.

HELIOS Energy Storage System

Discover HELIOS Energy Storage System is purpose-built for the replacement of 24V and 48V groupings of the popular GC-size lead-acid battery used in off-grid solar systems. Discover HELIOS ESS incorporate a proprietary high-current BMS that delivers superior peak power along with lightning-fast 1C continuous charge and discharge rates, and unlike lead-acid batteries, can be continuously operated in a partial state of charge (PSOC) without degrading performance. Discover HELIOS features COLD CHARGE functionality, allowing cold temperature charging to begin from -20⁰C / -4⁰F.

Battery Comparison & Cost Calculator

Having difficulty explaining the real cost of energy storage options in a way your customers can understand? Discover’s Energy Storage Cost Calculator is a tool for installers that compares CAPEX vs OPEX of the major storage chemistries used in off-grid solar over a 10-year period.

Compare AES lithium to other lithium, tubular or lead acid battery systems. All you need is the manufacturer’s data sheet and battery specifications. Discover’s Energy Storage Cost Calculator generates a printable report that will help you demonstrate the impact of battery chemistry choice on your customer’s total cost of energy storage.

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Additional Solar Energy Storage Applications

Utility Surcharge Avoidance Batteries

Store on-site renewable and electrical grid energy during times of low demand and low utility rates for consumption later avoiding peak period surcharges.

Whole-Home Backup Batteries

Store energy to power your home during blackouts or weather-related grid outage and enable self-consumption of renewable energy to avoid peak period utility rates.

Rural Microgrid Batteries

Large capacity energy storage combined with localized generation to create an autonomous electric grid that will support a farm, resort, commercial operation, or multiple residences.