{"id":25657,"date":"2026-11-05T11:51:07","date_gmt":"2026-11-05T10:51:07","guid":{"rendered":"https:\/\/knestel.de\/knestronx\/low-power-dc-platform\/"},"modified":"2026-11-05T11:51:16","modified_gmt":"2026-11-05T10:51:16","slug":"low-power-dc-platform","status":"publish","type":"page","link":"https:\/\/knestel.de\/en\/knestronx\/low-power-dc-platform\/","title":{"rendered":"Low-Power DC Platform"},"content":{"rendered":"\t\t
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<\/path><\/rect><\/rect><\/rect><\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

knestronX \u00b7 LPDC platform<\/p>\n\t\t\n<\/div>\n\t\t\t

Battery inverter built from three modules<\/h1>\n\t\t\t\t\t

The Low-Power DC Platform (LPDC platform) connects the 230 VAC grid to batteries from 12 to 65 VDC. AC\/DC converter, galvanic isolation, and bidirectional DC\/DC converter are separate modules rated at 3.6 kW each. They can be freely combined and connected in parallel.<\/p>\n\t\t

\n \t\t\t\n\tDiscuss your application\n<\/a>\n\t\t\t\t\t\n\tView modules\n<\/a>\n\t\t\n<\/div>\n\n<\/div>\n
\n \t\t
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High-voltage side<\/span>Extra-low-voltage side<\/span><\/div>\n
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230 VAC<\/b>Grid, generator<\/span><\/div>\n
<\/div>\n
AFE<\/b>AC\/DC<\/span><\/div>\n
380 VDC<\/em><\/div>\n
ISO<\/b>galvanic isolation<\/span><\/div>\n
70 VDC<\/em><\/div>\n
DCD<\/b>DC\/DC<\/span><\/div>\n
<\/div>\n
12\u201365 VDC<\/b>Battery, PV, load<\/span><\/div>\n <\/div>\n
<\/figcaption>\n <\/figure>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t

Energy flows in both directions: charging from the grid or a generator, discharging into the grid or into your own island grid.<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/section>\n

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3.6 kW<\/p>\n\t\t\t\t\t

Rated power per module<\/p>\n\t\t\n<\/div>\n

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5.8 kW<\/p>\n\t\t\t\t\t

Peak power for 3 seconds<\/p>\n\t\t\n<\/div>\n

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70 VDC<\/p>\n\t\t\t\t\t

DC link below the 120 VDC limit for SELV and PELV<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

12\u201365 VDC<\/p>\n\t\t\t\t\t

Adjustable battery voltage<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n

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The modules<\/p>\n\t\t\t\t\t

One string, three tasks<\/h2>\n\t\t\t\t\t

Each module operates bidirectionally and is connected to the internal CAN bus. A higher-level master controls operating modes and setpoints.<\/p>\n\t\t\n<\/div>\n

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\n \t\t\tAFE<\/b><\/span>\n\t\t\t\t\tAC\/DC conversion<\/span>\n\t\t\n<\/div>\n\t\t\t

Active front end between the 230 VAC grid and the 380 VDC DC link. As a PFC rectifier, it charges from the grid or a generator; as an inverter, it feeds back into the grid or forms its own grid.<\/p>\n\t\t

\n \t\t\tInput current can be limited to 6, 10, or 16 A<\/span>\n\t\t\t\t\t3 modules for three-phase operation at 120\u00b0<\/span>\n\t\t\t\t\tGrid-forming operation<\/span>\n\t\t\t\t\tCharging at a charging station (CP\/PP)<\/span>\n\t\t\n<\/div>\n\t\t\t

Monitoring:<\/strong> overload, short circuit, temperature, undervoltage and overvoltage<\/p>\n\t\t\n<\/div>\n

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\n \t\t\tParameter<\/span>\n\t\t\t\t\tAC side<\/span>\n\t\t\t\t\tDC side<\/span>\n\t\t\t\t\tVoltage<\/span>\n\t\t\t\t\t230 VAC \u00b110 %<\/span>\n\t\t\t\t\t380 VDC<\/span>\n\t\t\t\t\tRated power<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\tPeak power (3 s)<\/span>\n\t\t\t\t\t5.4 kW<\/span>\n\t\t\t\t\t5.4 kW<\/span>\n\t\t\t\t\tRated current<\/span>\n\t\t\t\t\t16 A<\/span>\n\t\t\t\t\t10 A<\/span>\n\t\t\t\t\tPeak current (3 s)<\/span>\n\t\t\t\t\t24 A<\/span>\n\t\t\t\t\t15 A<\/span>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/article>\n
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\n \t\t\tISO<\/b><\/span>\n\t\t\t\t\tGalvanic isolation<\/span>\n\t\t\n<\/div>\n\t\t\t

Isolated, bidirectional DC\/DC converter from 380 VDC to 70 VDC. It safely separates the high-voltage DC link from the extra-low-voltage side.<\/p>\n\t\t

\n \t\t\tIsolation voltage 2 kV<\/span>\n\t\t\t\t\tIsolation voltage 4 kV<\/span>\n\t\t\n<\/div>\n\t\t\t

At 70 VDC, the bus stays below the 120 VDC limit and can be implemented as SELV or PELV.<\/p>\n\t\t\t\t\t

Monitoring:<\/strong> overload, short circuit, temperature<\/p>\n\t\t\n<\/div>\n

\n
\n \t\t\tParameter<\/span>\n\t\t\t\t\tHV side<\/span>\n\t\t\t\t\tLV side<\/span>\n\t\t\t\t\tVoltage<\/span>\n\t\t\t\t\t380 VDC<\/span>\n\t\t\t\t\t70 VDC<\/span>\n\t\t\t\t\tRated power<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\tPeak power (3 s)<\/span>\n\t\t\t\t\t5.4 kW<\/span>\n\t\t\t\t\t5.8 kW<\/span>\n\t\t\t\t\tRated current<\/span>\n\t\t\t\t\t10 A<\/span>\n\t\t\t\t\t52 A<\/span>\n\t\t\t\t\tPeak current (3 s)<\/span>\n\t\t\t\t\t15 A<\/span>\n\t\t\t\t\t83 A<\/span>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/article>\n
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\n \t\t\tDCD<\/b><\/span>\n\t\t\t\t\tDC\/DC conversion<\/span>\n\t\t\n<\/div>\n\t\t\t

Bidirectional DC\/DC converter between the 70 VDC bus and a battery, PV module, or DC load. The output voltage is adjustable between 12 and 65 VDC.<\/p>\n\t\t

\n \t\t\tCAN to the battery management system<\/span>\n\t\t\t\t\tModbus for DTU and monitoring<\/span>\n\t\t\t\t\tMPPT for PV input<\/span>\n\t\t\n<\/div>\n
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Continuous power at 60 A battery current<\/p>\n\t\t

\n \t\t\t12 V<\/span>\n\t\t
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\n \n<\/div>\n\n<\/div>\n\t\t\t720 W<\/span>\n\t\t\n<\/div>\n
\n \t\t\t24 V<\/span>\n\t\t
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\n \n<\/div>\n\n<\/div>\n\t\t\t1.44 kW<\/span>\n\t\t\n<\/div>\n
\n \t\t\t36 V<\/span>\n\t\t
\n
\n \n<\/div>\n\n<\/div>\n\t\t\t2.16 kW<\/span>\n\t\t\n<\/div>\n
\n \t\t\t48 V<\/span>\n\t\t
\n
\n \n<\/div>\n\n<\/div>\n\t\t\t2.88 kW<\/span>\n\t\t\n<\/div>\n
\n \t\t\t60 V<\/span>\n\t\t
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\n \n<\/div>\n\n<\/div>\n\t\t\t3.6 kW<\/span>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n
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\n \t\t\tParameter<\/span>\n\t\t\t\t\tBus side<\/span>\n\t\t\t\t\tBattery side<\/span>\n\t\t\t\t\tVoltage<\/span>\n\t\t\t\t\t70 VDC<\/span>\n\t\t\t\t\t12\u201365 VDC<\/span>\n\t\t\t\t\tRated power<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\t3.6 kW<\/span>\n\t\t\t\t\tPeak power (3 s)<\/span>\n\t\t\t\t\t5.8 kW<\/span>\n\t\t\t\t\t5.8 kW<\/span>\n\t\t\t\t\tRated current<\/span>\n\t\t\t\t\t52 A<\/span>\n\t\t\t\t\t60 A<\/span>\n\t\t\t\t\tPeak current (3 s)<\/span>\n\t\t\t\t\t83 A<\/span>\n\t\t\t\t\t105 A<\/span>\n\t\t\n<\/div>\n\t\t\t

Monitoring:<\/strong> overload, short circuit, temperature, undervoltage and overvoltage<\/p>\n\t\t\n<\/div>\n\n<\/article>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n

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Scaling<\/p>\n\t\t\t\t\t

More power with more modules<\/h2>\n\t\t\t\t\t

The system can be expanded independently at three points. The same modules can form a small single-phase storage system or a three-phase system in the double-digit kilowatt range.<\/p>\n\t\t\n<\/div>\n

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AC side<\/p>\n\t\t\t\t\t

AFE in parallel<\/h3>\n\t\t\t\t\t

More power per phase or additional 230 VAC connections. Via the sync bus, three AFEs form a three-phase grid with 120\u00b0 phase shift.<\/p>\n\t\t\n<\/div>\n

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Isolation point<\/p>\n\t\t\t\t\t

ISO parallel<\/h3>\n\t\t\t\t\t

Each additional ISO module increases the power transferred between the high-voltage and extra-low-voltage sides.<\/p>\n\t\t\n<\/div>\n

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DC side<\/p>\n\t\t\t\t\t

One DCD per battery<\/h3>\n\t\t\t\t\t

The 70 VDC bus runs as many DCDs as there are batteries, PV modules or DC loads connected, even at different voltages.<\/p>\n\t\t\n<\/div>\n\n<\/div>\n

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21.6 kW<\/p>\n\t\t\t\t\t

Example calculation: two AFEs per phase, three phases. 6 \u00d7 3.6 kW<\/strong> add up to 21.6 kW rated power, three-phase.<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/section>\n

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Applications<\/p>\n\t\t\t\t\t

Where the LPDC platform is used<\/h2>\n\t\t\n<\/div>\n
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<\/rect><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Battery inverter<\/h3>\n\t\t\t\t\t

Charge and discharge storage on the 230 VAC grid. With 48 V batteries, two DCDs share the power; from 60 V upward, one is enough.<\/p>\n\t\t

\n \t\t\t3.6 kW<\/b><\/span>\n\t\t\t\t\tsingle-phase<\/span>\n\t\t\t\t\t10.8 kW<\/b><\/span>\n\t\t\t\t\tthree-phase with three strings<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/rect><\/path><\/circle><\/circle><\/circle><\/svg><\/div>\n\t\t\t\t\t

UPS for data centers<\/h3>\n\t\t\t\t\t

Online double-conversion UPS: one AFE rectifies the grid to 380 VDC, and a second AFE uses it to form the supply for the servers. The battery is connected to the DC link via ISO and DCD and takes over during a power outage without any switchover. Racks with 48 V DC are supplied directly by a DCD.<\/p>\n\t\t

\n \t\t\tOnline<\/b><\/span>\n\t\t\t\t\tdouble conversion, battery on the DC link<\/span>\n\t\t\t\t\t48 VDC<\/b><\/span>\n\t\t\t\t\track supply via DCD<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/rect><\/circle><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Generator Booster<\/h3>\n\t\t\t\t\t

The AFE operates in parallel with the generator and feeds in power from the battery. The storage covers load peaks, and the generator recharges it during low-load periods.<\/p>\n\t\t\t\t\t

\n\t\tView the 27 kW configuration example\n\t<\/a><\/p>\n\t\t

\n \t\t\t5.4 \u2192 16.2 kW<\/b><\/span>\n\t\t\t\t\tGenerator 3 \u00d7 1.8 kW plus 3 \u00d7 3.6 kW from the battery<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/path><\/path><\/circle><\/circle><\/path><\/svg><\/div>\n\t\t\t\t\t

Emergency power supply<\/h3>\n\t\t\t\t\t

If the grid fails, the grid disconnect opens and the AFE forms the grid for the emergency circuit from the battery. Battery capacity determines the bridging time.<\/p>\n\t\t

\n \t\t\t1~ or 3~<\/b><\/span>\n\t\t\t\t\tgrid-forming, three-phase with three synchronized AFEs<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

PV storage<\/h3>\n\t\t\t\t\t

PV modules connect directly to the 70 VDC bus via a DCD with MPPT and charge the battery without going through the AC grid.<\/p>\n\t\t

\n \t\t\tMPPT<\/b><\/span>\n\t\t\t\t\toption for the DCD<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
\n \t\t\t
<\/rect><\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Charging at a charging station<\/h3>\n\t\t\t\t\t

The AFE evaluates Control Pilot and Proximity Pilot. This allows the system to charge its battery at a wallbox or public charging station, for example as mobile storage.<\/p>\n\t\t

\n \t\t\tCP \/ PP<\/b><\/span>\n\t\t\t\t\tOption for the AFE, input current 6, 10 or 16 A<\/span>\n\t\t\n<\/div>\n\n<\/article>\n\n<\/div>\n\t\t\t

Further applications<\/h3>\n\t\t
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<\/rect><\/path><\/svg><\/div>\n\t\t\t\t\t

Battery test bench<\/h3>\n\t\t\t\t\t

The DCD charges and discharges battery modules from 12 to 65 V. The energy is fed back into the grid via the AFE instead of being dissipated as heat in load resistors.<\/p>\n\t\t

\n \t\t\t12\u201365 V<\/b><\/span>\n\t\t\t\t\tdevices under test, energy fed back<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Onboard power systems<\/h3>\n\t\t\t\t\t

For special-purpose vehicles, boats and motorhomes: shore power is turned into an onboard power system with battery buffer via galvanic isolation. Multiple DCDs supply different voltage levels.<\/p>\n\t\t

\n \t\t\t12 \/ 24 \/ 48 V<\/b><\/span>\n\t\t\t\t\tfrom shore power, galvanically isolated<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
\n \t\t\t
<\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Radio sites<\/h3>\n\t\t\t\t\t

Buffered 48 VDC supply for radio and network equipment. With PV via a DCD with MPPT, also at remote sites.<\/p>\n\t\t

\n \t\t\t48 VDC<\/b><\/span>\n\t\t\t\t\tfrom grid, battery and PV<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
\n \t\t\t
<\/path><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Peak shaving<\/h3>\n\t\t\t\t\t

The storage covers power peaks from machines or cooling systems, reducing the power drawn at the grid connection.<\/p>\n\t\t

\n \t\t\t6 \/ 10 \/ 16 A<\/b><\/span>\n\t\t\t\t\tAFE input current can be limited<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
\n \t\t\t
<\/rect><\/rect><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Second-life storage<\/h3>\n\t\t\t\t\t

Used battery packs with different voltages each operate on their own DCD on the shared 70 VDC bus.<\/p>\n\t\t

\n \t\t\t1 DCD<\/b><\/span>\n\t\t\t\t\tper battery pack<\/span>\n\t\t\n<\/div>\n\n<\/article>\n
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<\/rect><\/circle><\/circle><\/path><\/path><\/svg><\/div>\n\t\t\t\t\t

Mobile power<\/h3>\n\t\t\t\t\t

For construction sites and events: the storage charges at a charging station and supplies power on site as an island grid, quietly and without exhaust fumes.<\/p>\n\t\t

\n \t\t\tCP \/ PP<\/b><\/span>\n\t\t\t\t\tcharging, grid-forming on site<\/span>\n\t\t\n<\/div>\n\n<\/article>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n
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Configuration example<\/p>\n\t\t\t\t\t

Generator support with 27 kW<\/h2>\n\t\t\t\t\t

A generator with 3 \u00d7 1.8 kW supplies loads whose peaks are far higher. Six strings of the LPDC platform raise the available power to 27 kW three-phase. A PV system additionally charges the storage.<\/p>\n\t\t\n<\/div>\n

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Scroll the circuit diagram sideways to see all modules.<\/p>\n\t\t\n<\/div>\n\t\t\t

Why separate DC links?<\/strong> Each AFE operates between line conductor and neutral conductor. If the DC links of all phases were connected together, the phases would be interconnected via the AFEs. That is why each phase has its own 380 VDC DC link. Only after the galvanic isolation in the ISO module do all strings converge on the shared 70 VDC bus.<\/p>\n\t\t

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5.4 kW<\/p>\n\t\t\t\t\t

Generator, 3 \u00d7 1.8 kW<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

+21.6 kW<\/p>\n\t\t\t\t\t

from battery and PV via six AFEs, up to 32.4 kW for 3 seconds<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

27 kW<\/p>\n\t\t\t\t\t

rated power, three-phase, for the loads<\/p>\n\t\t\n<\/div>\n\n<\/div>\n

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Bill of materials<\/h3>\n\t\t
\n \t\t\tModule<\/span>\n\t\t\t\t\tQuantity<\/span>\n\t\t\t\t\tFunction<\/span>\n\t\t\t\t\tAFE<\/span>\n\t\t\t\t\t6<\/span>\n\t\t\t\t\tTwo per phase in parallel with the generator, synchronized via the sync bus<\/span>\n\t\t\t\t\tISO<\/span>\n\t\t\t\t\t6<\/span>\n\t\t\t\t\tTwo per phase: connect the phase DC link to the shared 70 VDC bus, 6 \u00d7 3.6 kW in total<\/span>\n\t\t\t\t\tDCD<\/span>\n\t\t\t\t\t8<\/span>\n\t\t\t\t\tBattery 48 V: 8 \u00d7 2.88 kW at 60 A, approx. 23 kW for a demand of 21.6 kW<\/span>\n\t\t\t\t\tDCD with MPPT<\/span>\n\t\t\t\t\t1<\/span>\n\t\t\t\t\tPV modules on the 70 VDC bus<\/span>\n\t\t\t\t\tMaster<\/span>\n\t\t\t\t\t1<\/span>\n\t\t\t\t\tOperating modes and setpoints for all modules via CAN<\/span>\n\t\t\n<\/div>\n\n<\/div>\n
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Operating states<\/h3>\n\t\t
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Low load<\/b><\/p>\n\t\t\t\t\t

The generator covers the load. The AFEs use the surplus to charge the battery.<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

Load peak<\/b><\/p>\n\t\t\t\t\t

The AFEs feed in power from the battery. The generator stays within its rated range.<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

Sun<\/b><\/p>\n\t\t\t\t\t

The PV modules charge via the DCD with MPPT directly on the 70 VDC bus.<\/p>\n\t\t\n<\/div>\n

\n \t\t\t

Generator off<\/b><\/p>\n\t\t\t\t\t

The AFEs form the grid from battery and PV alone.<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\t\t\t

Sum of rated values. Sizing depends on load profile, generator and battery.<\/p>\n\t\t\n<\/div>\n\n<\/section>\n

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Interfaces<\/p>\n\t\t\t\t\t

Networked via CAN<\/h2>\n\t\t\n<\/div>\n
\n \t\t\tInterface<\/span>\n\t\t\t\t\tModule<\/span>\n\t\t\t\t\tPurpose<\/span>\n\t\t\t\t\tCAN internal<\/span>\n\t\t\t\t\tall<\/span>\n\t\t\t\t\tNetworking and control of the modules<\/span>\n\t\t\t\t\tCAN battery<\/span>\n\t\t\t\t\tDCD<\/span>\n\t\t\t\t\tBattery management data<\/span>\n\t\t\t\t\tModbus<\/span>\n\t\t\t\t\tDCD, option<\/span>\n\t\t\t\t\tConnection to DTU and monitoring<\/span>\n\t\t\t\t\tSync bus<\/span>\n\t\t\t\t\tAFE<\/span>\n\t\t\t\t\tPhase angle in parallel and three-phase operation<\/span>\n\t\t\t\t\tCP \/ PP<\/span>\n\t\t\t\t\tAFE, option<\/span>\n\t\t\t\t\tCharging at a charging station<\/span>\n\t\t\t\t\t24 VDC<\/span>\n\t\t\t\t\tall<\/span>\n\t\t\t\t\tControl voltage<\/span>\n\t\t\n<\/div>\n\n<\/div>\n
\n
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Installation space<\/p>\n\t\t\t\t\t

Compact string<\/h2>\n\t\t\n<\/div>\n
\n
\n
\n \t\t\tAFE<\/span>\n\t\t\n<\/div>\n\t\t\t150 \u00d7 200
\u00d7 80 mm<\/span>\n\t\t\n<\/div>\n
\n
\n \t\t\tISO<\/span>\n\t\t\n<\/div>\n\t\t\t150 \u00d7 320
\u00d7 100 mm<\/span>\n\t\t\n<\/div>\n
\n
\n \t\t\tDCD<\/span>\n\t\t\n<\/div>\n\t\t\t150 \u00d7 160
\u00d7 40 mm<\/span>\n\t\t\n<\/div>\n\n<\/div>\n
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\n \t\t\tOne string: AFE + ISO + DCD<\/span>\n\t\t\t\t\t320 \u00d7 370 \u00d7 120 mm<\/b><\/span>\n\t\t\n<\/div>\n
\n \t\t\tTwo strings side by side<\/span>\n\t\t\t\t\t640 \u00d7 370 \u00d7 120 mm<\/b><\/span>\n\t\t\n<\/div>\n\n<\/div>\n\t\t\t

Dimensions from the concept phase, subject to change during development.<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n

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Contact<\/p>\n\t\t\t\t\t

Let's talk about your application\u200b<\/h2>\n\t\t\t\t\t

Tell us your grid connection, battery voltage and power requirement. We will suggest a suitable combination of modules.\u200b<\/p>\n\t\t

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