DC-Coupled Storage

Optimize Solar + Storage

PV+storage systems with Ampt deliver more energy and have a lower capex compared to other approaches.

 

The Ampt Advantage = More Energy + Lower Capex + Future Proof

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More Energy

PV+storage systems with Ampt generate, capture, and deliver more energy to increase project ROI.

Lower Capex

Ampt saves on EBOS, ESS, and PCS costs on day-one to deliver the lowest cost per kWh PV+storage systems.

Future Proof

Ampt lowers costs and increases flexibility when adding or replacing storage, modules, and PCS components in the future.

More Energy

PV+storage systems with Ampt generate, capture, and deliver more energy to increase project ROI.

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Roundtrip Efficiency

Achieve higher roundtrip storage efficiency while increasing the operating efficiency of the inverter and battery converter.

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Clipped Energy Harvest

Charge the battery when the PV inverter is clipping output power. Ampt enhances this benefit with higher DC/AC ratios (up to 3:1).

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Curtailment Harvest

Capture array power that would normally be lost by charging the battery during periods of AC power curtailment.

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Low Voltage Harvest

Charge the battery storage system when the array voltage is below the inverter turn on voltage to maximize energy production.

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Mismatch Recovery

Deliver more energy by recovering mismatch losses from various sources with string-level maximum power point tracking (MPPT).

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Mitigate Degradation

Recover energy losses caused by variable degradation of PV cell and modules within a system to improve lifetime system performance.

Lower Capex

Ampt saves on EBOS, ESS, and PCS costs on day-one to deliver the lowest cost per kWh PV+storage systems.

Lower Cost EBOS

Ampt’s patented technology allows for more modules per string to eliminate electrical BOS components and labor.

Lower Cost ESS & PCS

Ampt increases battery converter and inverter power densities to lower the cost per watt.

Higher DC/AC Ratios

Ampt optimizers enable higher DC/AC ratios (up to 3:1) to lower capex and enable longer storage durations.

Lower Cost Electrical BOS

Ampt String Stretch® Technology Allows More Modules per String

Ampt optimizers feature output current limits which reduces cable ampacity by eliminating the margin requirement for “over sun” conditions. Additionally, PV arrays with Ampt operate at a high and fixed DC bus voltage which lowers current (I=P/V). By allowing more modules per string, Ampt lowers overall electrical balance of system costs - such as cabling and combiners or cabling harnesses.

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Lower Cost ESS and PCS

Lower Cost Energy Storage System (ESS) with Ampt

Using Ampt operates the DC bus at a higher voltage which simplifies battery conversion requirements with a 50% reduction in conversion circuitry while increasing the battery converter's power density. This reduces battery converter costs by 50%.

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PCS Always Delivers Full Power at Its Maximum Rated Output Voltage with Ampt

A power conditioning system (PCS) or inverter in Ampt Mode® is configured by the manufacturer to operate at a fixed input voltage that is closer to the maximum system voltage. This high fixed-voltage bus with Ampt removes ambient temperature and string length constraints on the PCS so it can operate at a DC voltage that is always high enough to achieve its maximum rated output voltage.

For example, a PCS rated at 690 VAC that is deployed in a warmer environment without Ampt would be derated to a voltage below 690 VAC and therefore be underutilized. With Ampt, this PCS in the same environment achieves its highest rated power to lower the PCS cost per watt.

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Lower Cost PCS with Ampt

A power conditioning system (PCS) or inverter in Ampt Mode® can achieve a higher AC output voltage than a standard PCS without Ampt to lower the cost per watt.

For example, a standard PCS without Ampt has a specified rated output voltage (e.g. 600 VAC) which requires a wide operating range for the input voltage to accommodate the array. For this PCS to achieve 800 VAC while maintaining the wide operating range would require the input voltage to exceed 1500 VDC. However, this same PCS with Ampt can be set at a fixed input voltage to deliver 800 VAC on the output. This higher output voltage at the same output current increases the rated output power of the PCS which lowers its cost per watt.

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Higher DC/AC Ratios

Ampt Allows for Higher DC/AC Ratios to Lower Total System Cost

Higher DC ratios lower the cost of energy storage while optimally increasing storage durations. Ampt's patented technology protects the inverter so system designers can achieve higher loading ratios than can systems without Ampt to lower the total system cost.

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Optimal DC/AC Ratio Lowers Capex

As energy storage durations increase, the optimal DC/AC ratio also increases to result in an overall capex savings as illustrated in these graphs.

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Ampt Protects Inverter at High DC/AC Ratios

During normal operation, the optimizer maintains PV maximum power point (MPP) and operates at a fixed output voltage (e.g. 1350V) while delivering full array power to satisfy the load (grid, battery, or both). The optimizers move the array off MPP when inverter is in power control mode.

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The Ampt Factor Allows for Higher DC/AC Ratios

The example shown is for an inverter that has a maximum DC/AC ratio of 1.52 and a minimum MPP voltage of 850-volts (both without Ampt). With Ampt, the inverter input operates at a fixed high voltage of 1350-volts to achieve a 3.0 loading ratio.

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Future Proof

Ampt lowers costs and increases flexibility when adding or replacing storage, modules, and PCS components to increase project ROI as systems age or as revenue streams change.

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Scalable Capacity and Duration

Ampt technology provides flexible options to increase storage capacity and/or duration over time at a lower cost.

  • Increase energy storage capacity with lower cost ESS components
  • Increase energy storage duration with fewer and lower-cost ESS components
  • Increase DC array power
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Increase DC Array Power

Systems with Ampt can increase DC power capacity using the existing electrical BOS and without creating voltage mismatch between strings or overloading the existing ESS and PCS.

  • Mix new and legacy PV modules
  • Use higher power PV modules or add strings
  • Achieve up to 3:1 DC/AC ratios
  • Export more energy while charging the batteries
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Lower Cost ESS & PCS Replacements

Ampt allows the DC bus to operate at a fixed voltage which can be adjusted to fit newer technologies over time. Systems with Ampt have more replacement options for storage components to lower costs.

  • Avoid risk of obsolete components
  • Adapt legacy PV systems with newer and lower cost battery converters and PCS
  • Avoid costly re-wiring and re-trenching
  • Simplify ESS/PCS interoperability
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Lifetime Benefits with Ampt

Ampt Optimizers offer low-cost options when upgrading your existing PV systems to produce more energy and maximize annual project returns. Systems with Ampt recover energy lost from:

  • Variable degradation
  • Mismatch
  • Underperforming inverters

 

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Superior storage with Ampt

  • Lower total solar+storage project cost
  • Lower cost power conversion
  • Higher round-trip efficiency
  • Scalable up to large-scale power plants
  • Battery technology independent
  • Standard or bi-directional inverter
  • Easier and lower cost storage expansion
  • More lifetime energy with string-level MPPT
  • Up to 50% fewer combiners and cabling
  • Improved O&M with string-level data
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Contact us for more information

Find out how Ampt lowers ESS costs while improving the performance of your PV array.