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


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.


Roundtrip Efficiency

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


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).


Curtailment Harvest

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


Low Voltage Harvest

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


Mismatch Recovery

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


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.


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%.


Lower Cost Power Conversion System (PCS) with Ampt

A 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 enables a higher output voltage at the same current to increase the PCS rated output power (see the example shown).


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

A PCS with Ampt is not constrained by ambient temperature or strings lengths. This means it can always operate at its maximum rated output voltage. For example, a PCS rated at 690 VAC that is deployed in a hot environment will not need to be derated to a voltage below 690VAC.


A PCS deployed with Ampt achieves its highest rated power at a lower cost per watt.


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.


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.


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.


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.


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.


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

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

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

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



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

Contact us for more information

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