RELINK - benefit of micro inverters

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Benefits of PV micro inverter systems Vins di Gennaro

Transcript of RELINK - benefit of micro inverters

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Benefits of PV micro inverter systems

Vins di Gennaro

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RELINK - the company✓ Founded 2013 in Malta to develop an innovative range of Energy

Storage systems combined with Micro Inverters co-developed with a primary technology provider of PV conversion.

✓ RELINK relies on the wide and strong skills of its founders in the Energy and Renewables segments, in photovoltaic since 2007.

✓ RELINK has offices in:✓ Malta✓ Germany✓ Melbourne foreseen in 2016

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RELINK - micro inverter technology✓ The unique RELINK technology has been developed with a

partnership with a world leader of Energy Conversion and the former R&D manager of a PV inverter leader.

✓ The RELINK micro inverters optimize the energy output of a PV module converting in the most efficient way the DC power in AC power available to the electric grid.

✓ The RELINK micro inverters offer an impressive value proposition for the PV systems.

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RELINK - a complete system

Gateway

Monitoring

Micro Inverter

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RELINK - microinverter benefits✓ Longer life time and reliability

o eliminates components that represent main reason of failure getting a life time of 25 years.

✓ The best output powero Optimizes power for each module / stable over wide

temperature range.

✓ Increased safetyo Low voltage AC current, no high DC voltages, significant

reduction of fire hazard

✓ Simplified design and installation o Easy design due to independence of each/couple of

modules, minumum shade impact. No DC cables.

✓ Advanced monitoring systems o Accessible via Web, smart phone and tablet.

RELINK

Converts each moduleMAXIMUM ENERGY

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String vs. Micro inverter

When PV modules is shaded, with string inverter, each module connected in series, domino effect reduces ower output of entire PV system.

RELINK micro inverters, with modules connected in parallel, eliminate the domino effect, provide maximum power output.

The problem The Solution

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String inverter layout

PV strings - DC side Inverter - AC side

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Micro inverter layout

1 or 2 PV modules - DC side Micro Inverter - AC side

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RELINK - the best convertion systemComponents with limited reliability, short life used in string inverters:✓ Electrolytic Capacitors and opto-isolators.

o the best electrolytic capacitors have an operational duration of about 7.000 hours @ 105°C.

✓ String inverter expeted life time 8 to 10 years.

The RELINK technology has superior performances: ✓ Does not use components with limited life time.✓ Improves the stability and the Maximum Power Point Tracking (MPPT). ✓ The life time of a RELINK micro inverter is more than 25 years.

o Uses innovative capacitors with operational duration of about 21.000 hours @ 105°C. (3 times more than string inverter)

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RELINK benefit - more output power String Inverters Micro Inverter RELINK

Micro Inverters eliminate DOMINO effect and performance mismatch of PV modules

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RELINK benefit - more output power

What causes modules mismatch

Dust & Debris Defects & Degradation

Different temperature Shade & obstacles

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RELINK - benefit higher reliability

Test duration: 24 monthsNumber of inverters

✓ Micro: 10.360✓ String: 3.373Defects

✓ Micro: 0,21%✓ String: 9,43%

Field reliability45x

Field reliability test

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RELINK - benefit higher reliability

RELINK

✓ PV system architectureo A single event cannot stop all

the systemo The field interventions are dine

only on a small portion of the system

o Service is less urgent

PV systen availabilty> 99,4 %

String

Time

Time

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RELINK - outstanding safetyNo high voltage DC cables✓ The maximum Dc voltage is lower than 60V. DC-AC conversion is done

at module level. No electrical archs risk.

The micro inverter automatically switches off if: ✓ grid is off (no AC present)✓ temperature is too high (thermal switching)

Significant reduction of folgoration and fire hazards✓ Increased safety for installers and firemen. ✓ Improved asset protection and better risk management.

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RELINK - real case in Australia 2,2kWp✓ Difficult roof for string inverters

due to double shade.

✓ Professional PV installer should not install a string inverter in this situation.

✓ RELINK micro inverters offer best solution by reducing shade impact and maximising energy output

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RELINK - real case in Australia 2,2kWp✓ The increased PV

system energy production ranges from:

✓ Min + 5% w/o shadeo more MPPTo no mismatch

✓ Up to + 30% with shade

Shaded modules have no impact on overall performance of the system

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RELINK - real case in Australia 2,2kWp

MICRO

Increased productivity

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Energy Sharing Mode in Offices

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RELINK - micro inverter conclusionsMICRO RELINK STRING

Productivity Precise and constant(from +5 to +30%)

Variable

Reliability System availability 99,4%Defects < 0,5%

System availability 85%Defects > 4%

Duration >25 years 8-10 yearsEasiness Completely AC

Integrated cablingComplex Design

Safety Low DC voltagesSwitches off at high temp.

DC archs riskFire hazard

Life time cost of micro inverter 50% lower than string

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