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What is a string inverter.

10/26/2017

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Simply put, a string inverter is a device for converting DC to AC power and which is designed for high voltage DC inputs.
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Using a string inverter, the solar panel array, still typically rated at 12V, 24V or 48V each panel (although higher voltage panels are now coming out) is wired in series, rather than in parallel. It's that simple: The panels are arrayed in a "string" to produce the same amount of total power but at higher voltages (typically 200-800V), thus lower current, allowing much smaller wiring and much smaller and lighter weight inverter construction. The IR losses encountered in wiring are also present in the inverter equipment's electronics, thus higher voltage DC input circuitry can be built more economically and with lower internal losses, improving efficiency in the electronics as well as in the cabling between the solar array and the inverter.
The popularity of this new approach in PV (photovoltaic solar power) applications has not fallen on deaf ears in other arenas, as well. Small-scale wind generators, for instance, have followed a similar evolution. Starting with 12V and 24V automotive-type generators or other low voltage DC units and batteries, the more current crop of home wind generator systems are now using higher-voltage principals and, for grid-tied systems, are skipping the batteries, too. The term "string inverter" is somewhat nonsensical in this context because the small-scale wind generators are not typically done in arrays like solar panels and there is typically only a single generator per installation (for small systems). Now high-DC-voltage "grid-tie string inverters" are all the rage for use in wind systems, too.
So, string or no string, the bottom line is that the budding homebrew power industry is getting hip to high voltage as a means of improving system and inverter efficiency and lowering the costs of getting the power from one place (the roof or tower, etc.) to another (the location of the inverter). String inverters should more accurately be called simply "high input voltage inverters", probably, since the "string" moniker really applies only to multi-panel PV solar systems and these same units are very popular for wind and hydo-generation systems where there is no "string" of series-connected sources, per se.

Read more>>>>>

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KACO new energy supplies the power of the sun for South Africa’s energy independence.

4/2/2014

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When Farmer Herbert was still tilling the land, electricity in the South African Province of North Cape was still a novelty and electricity from sunlight… unthinkable! Today on that very site one hour north of Douglas, there is an enormous 22 MW solar power plant.  This project, as well as a second 11 MW park nearby named Greefspan, was conceived by Tenesol South Africa, which has in the meantime become a subsidiary of Sunpower. In March both PV parks went into operation.
 
"Overseeing the installation of the Powador 39.0 TL3: Anton de Swardt, Divisional Head of Technical, Services and Support with KACO new energy South Africa."
Picture: © KACO new energy GmbH


The French company  decided on the robust KACO new energy inverters in order to supply power tothe grid from 138,000 Tenesol type TE 240 modules mounted on uniaxial trackers. So now a total of 900 Powador 39.0 TL3 units ensure maximum harvesting of the sun in both utility plants which are part of the South African Government‘s Independent Power Producers Procurement Program.

The areas surrounding both plants do not really correspond to the pictures of the South African coastline that one knows from travel brochures. Here, further inland it is hot, much drier and therefore very dusty – that’s no picnic for people, cattle or inverters. Whereas the former know how to help themselves with water or Cape wine, a Powador must make do with dry technology: specially-tuned software from the research and development department together with special filters from ebm-pabst, a long-standing partner of the Neckarsulm PV Company in matters relating to cooling.

After accompanying the technical commissioning, KACO new energy South Africa will also be carrying out "Operations and Maintenance" to ensure full power in the new energy era at the Cape.

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KACO new energy’s latest: the Powador 20.0 TL3

10/27/2013

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KACO new energy has started delivery of the Powador 20.0 TL3. The new inverter is the flagship of the company’s three-phase inverters in the medium power range.

With an AC power of 17.0 kVA the youngest exponent of the TL3-series transports all the features that installers and owners have come to appreciate into a new dimension: double MPP-tracking (symmetrical and asymmetrical loading up to 14.9 kW per tracker), European efficiency rating of 97.6%, integrated webserver and a USB-port for updates.

Still in the well-known stable die cast enclosure with roughly 40 kg, KACO new energy’s most powerful wall-mounted inverter belongs to the lightest on the market in his output class.

Starting with single installations in the medium power range up to solar parks with a decentralized layout, the Powador 20.0 TL3 is recommended as a highly cost efficient solution.

About KACO new energy

KACO new energy is one of the world’s largest manufacturers of grid-tie inverters for feeding solar energy. The company offers a comprehensive range of solar inverters for everything from single-family homes to multi-megawatt solar farms. KACO new energy is based in Neckarsulm, Germany and has been producing inverters with a cumulative capacity of nearly six gigawatts since 1999. KACO new energy was the first company in the photovoltaic industry to manufacture inverters (the Powador model) in a completely CO2-neutral way. In addition to grid-tie and battery-based solar inverters, the company also supplies inverters for combined heat and power plants and concentrator modules as well as energy storage systems for solar power plants.

www.kaco-newenergy.de


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Central inverters from KACO new energy power Europe's largest solar roof

6/12/2013

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Neckarsulm, 12 June 2013 – It is Europe’s largest PV installation on a single roof: in the German town of Leinefelde-Worbis (Thuringia), a logistics complex is topped by an 8 MW solar power plant. For feeding the solar power into the grid, the project partners decided on the Powador XP550-HV TL by KACO new energy GmbH.

The most powerful central inverters by the German manufacturer of solar inverters and around 32,000 polycrystalline Jinko modules form Europe’s largest rooftop PV system. On a surface area of 80,000 m², 245 and 250 W modules are strung together to an overall power of 8 MW. This amount of solar electricity is enough to supply power to 2,000 households.

Solar-Dacheinkauf GmbH & Co. KG of Mannheim supplied the components, planning and turnkey installation have been in the hands of Solar-Energiedach GmbH of Sembach. Both companies have their origins in the roofing sector. This combination paid off; including the refurbishment of the roof, the modules, substructure and inverters were installed within only eight weeks. 

Dominik Daub, Managing Director of Solar-Dacheinkauf, explained the decision to use the Powador XP550-HV TL thus: "The price/performance ratio was just right. The transformerless Powador XP550-HV TL is highly flexible and was very easy to integrate into the overall system. What's more, the versatile monitoring options are really practical – which is very important when it comes to safeguarding an investment such as this."


About KACO new energy:
KACO new energy is one of the world’s largest manufacturers of grid-tie inverters for feeding solar energy. The company offers a comprehensive range of inverters for PV systems for everything from single-family homes to multi-megawatt solar farms. KACO new energy is based in Neckarsulm, Germany and has been producing inverters with a cumulative capacity of more than six gigawatts since 1999. KACO new energy was the first company in the photovoltaic industry to manufacture inverters (the Powador model) using CO2-neutral production methods. In addition to grid-tie and battery-based solar inverters, the company also supplies inverters for combined heat and power plants and concentrator modules as well as energy storage systems for solar power plants.

Contact: 
KACO new energy GmbH 
Andreas Schlumberger 
Head of Corporate Communications 
Carl-Zeiss-Str. 1 
74172 Neckarsulm, Germany 
Tel. +49 7132 3818-0 
Fax +49 7132 3818-703 
pr@kaco-newenergy.de 
www.kaco-newenergy.de


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KACO presents new products and integrated solutions at Intersolar Europe 2013

4/30/2013

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Energy revolution for everyone
Neckarsulm, 22 April 2013 – With solutions from KACO new energy, operators of
photovoltaic systems can do their part in the energy revolution: at this year's
Intersolar Europe in Munich, the Neckarsulm-based inverter manufacturer will
present products and solutions in this spirit. Innovations include the Powadorgridsave
and the Powador-gridsave eco, two flexible energy storage and
management systems for new and existing solar power systems. For the flagship
project “Quartierspeicher Weinsberg” (Weinsberg local storage), which the
company is presenting in-depth at the expo, KACO new energy has for the first
time developed the entire electrical and thermal power management system. Three
3-phase inverters with AC outputs from 5 to 7.5 kVA round out the proven TL3
series with equipment for use in the residential sector. T

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The Powador-gridsave system is a fully integrated, turnkey energy storage
and management system from KACO new energy: it combines batteries,
control unit and inverter in a compact stand-alone housing. The system
uses long-life lithium-ion batteries with a high depth of discharge. The
batteries collect the solar energy during the day and feed the home power
grid on a delayed basis so that the owner benefits from maximum power
consumption. The battery capacity is variable: up to five modules, each
with 1.35 kWh, can be incorporated in the housing as 19" plug-in units.
The DC coupling makes the Powador-gridsave ideal for integration in new
photovoltaic systems.

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The Powador-gridsave eco is AC-coupled and is therefore the solution
for upgrades of existing photovoltaic systems. The efficient control
technology acts as a go-between for the inverter of the photovoltaic
system, the battery and the public power grid. This bidirectional power
manager thus ensures that the entire system operates with the highest
level of efficiency. The capacity of the lead-acid batteries can be
selected to meet your needs. With this modular approach, the Powadorgridsave
eco provides maximum flexibility. A special highlight is the
capacity to switch virtually without interruption to backup power in the
event that the public grid fails. All activities can be viewed on a PC, and
you can conveniently upgrade functions via remote access or USB stick.

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The Powador 6.0 TL3, 7.8 TL3 and 9.0 TL3 round out the existing
quartet of Powador 10.0 TL3 to 18.0 TL3 units. The AC outputs are
5 kVA, 6.5 kVA and 7.5 kVA. This allows the benefits of these 3-phase
inverters to now be applied to smaller roof systems: the new units also
have a wide input voltage range from 200 to 800 V, as well as two MPP
trackers that are each able to process virtually all of the AC output. This
allows users to overcome difficult configurations such as an east-west
roof. An integrated web server, graphical display, update function via
USB and a multilingual menu provide convenient operation and global
applications.

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The Powador XP500-HV TL outdoor and the
XP550-HV TL outdoor are transformerless central
inverters for PV generators up to 600 kW or
660 kW. Based on their IP54 protection class,
they can be used outdoors. The no-load voltage of
1,100 V allows for a very flexible configuration of
the devices. The peak efficiency is an extremely
high 98.7 percent. These characteristics were
behind the decision to use the Powador XP550-HV TL outdoor for the world's largest
communal solar power plant with 400 MW output in San Antonio, Texas. Together with
external transformers and separators on the DC and AC side, two XPs are mounted on a
base plate to create a functional unit, the IPS (integrated power station).

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Under the name "Quartierspeicher Weinsberg"
(Weinsberg local storage) a model settlement
will go live in September 2013, in which
photovoltaic systems will almost entirely cover
the electricity demand and significantly
contribute to the heat supply. To enable rapid
charging and discharging of the central lithiumion
batteries, a newly developed bi-directional
inverter with 120 kW from KACO new energy
will be used. In addition, the company has for the first time implemented the entire power
management solution for both electrical and thermal requirements. The project in
Weinsberg provides the blueprint for a stand-alone solar energy supply, which could be
used by other large consumers, such as hotels and industrial operations. It also sees
KACO new energy at the beginning of a road toward implementing complex, highly
integrated solutions for its customers.Goodbye to Powador, blueplanet is coming: visitors to the KACO new energy booth at the
expo are likely to be particularly keen for a preview of the new inverters for 2014. In the
process of successful internationalisation, the company is re-branding its inverters so that
they have a standard name globally: blueplanet. This name is already in use in North
America – and it matches the company logo that is reminiscent of our blue planet as well.
With the introduction of the new blueplanet brand name, KACO new energy will also
name the inverters based on their AC output. New products that the company will be
presenting with the new nomenclature at Intersolar Europe include single-phase,
transformerless inverters for the residential sector up to 4.6 kVA AC output as well as a
3-phase, transformerless unit with 60 kVA. The booth staff will be happy to inform visitors
about further innovations and new products that revolve around the blueplanet.
Look for KACO new energy at Intersolar Europe in Munich from June 19-21, 2013 at
stand B5.310. The company will present its storage solutions directly next door at stand
B5.410
www.kaco-newenergy.de

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Current Automation now proud distributors of KACO Solar Inverters

4/20/2013

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  Single Phase - Transformerless Inverters
 
  The transformerless string inverter.  Our Powador 3200 to 6600* 
  transformerless single-phase inverters are now equipped with 
  digital controllers so that they can be used internationally.

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Three Phase

With the new transformerless three-phase inverters Powador 
6.0 TL3 to 9.0 TL3, now even small roof systems can be realised 
 with the most flexible line of threephase units on the market.

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 Central Inverters

 The central inverters of the Powador XP series are the fi rst choice 
 when it comes to usability and return on investment. State-of-the-art, 
 DSP-based technology offers highest performance, reliability and efficiency.


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 Monitoring

Remote monitoring of the performance of KACO inverters and external 
sensors via a web browser. Data storage interval for average values 
can be set in the range from 5-60 minutes.

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