An issue that has been discussed among the photovoltaic professionals is that of the battery voltage in residential storage systems.
Is there a better configuration than others?
Basically, there are three types of systems:
» low Voltage systems, about 48V;
» high Voltage systems, 400V approximately;
» high voltage modular systems (from 250 to more than 500V). These are realized by composing several battery packs, like in Lego® bricks, until the wanted capacity is reached.
Power electronics
In addition to assessing the type of battery, we need to consider the complete system, including the electronic power that performs the coupling with the network or with the build system: you can think that the greater economy and efficiency is obtained by connecting the battery to the DC side of a standard photovoltaic inverter and using the DC/DC converter input stage.
With this configuration, the most suitable battery voltage would be starting from 1/3 – 1/4 of the inverter DC bus voltage and the system would see an economy as regards installation costs (cables of reduced sections and switches).
The advantageous battery
The producers of residential storage systems consider advantageous the use of that kind of cells that are spreading also for other use, especially in the car industry, that makes the price competitive in terms of €/kWh.
This leads to the use of cells with a capacity in the range from 40-60Ah and voltages of about 48V.
High voltage systems contain lower voltage batteries (around 100V) and a DC/DC converter that raises the voltage up to the rated voltage.
Compared to this type of configuration, high voltage modular systems do not need an additional converter and potentially have a higher efficiency.
Battery standard configuration and conversion system
It should be pointed out that today the standard configuration battery and conversion system has not yet been consolidated: 48V batteries have economic advantages, those in high voltage have potentially higher return.
The range of storage systems offered by VP Solar are present in the custom price list that resellers can find in their private area.
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BYD, Storage Battery
BYD: Battery-Box Premium HVS / HVM – high voltage – from 5.1 to 66.2 kWh
The new high voltage batteries of the BYD brand are devices compatible with many single-phase and three-phase inverter brands.
BATTERY-BOX PREMIUM HVS
- composed of 2 to 5 HVS battery modules
- capacity of 5.1 to 12.8 kWh
BATTERY-BOX PREMIUM HVM
- composed of 3 to 8 HVM battery modules
- capacity of 8.3 to 22.1 kWh
SKU: n/a -
BYD, Storage Battery
BYD: Battery-Box Premium LVS – low voltage – from 3.8 kWh to 245.8 kWh
BYD Battery-Box Premium LVS low voltage battery (48V) to be combined with various three-phase and single-phase inverters.
- Scalable from 4 kWh to 246 kWh
- Maximum Flexibility for any application with up to 64 Modules connected in parallel
- Capable of High-Powered Emergency-Backup and Off-Grid Function
- Patented Internal Plug Design Requires No Additional Wiring
SKU: n/a -
GoodWe, Storage Battery
GoodWe Lynx Home U – low voltage – from 5.4 kWh to 32.4 kWh
GoodWe’s Lynx Home U Series lithium batteries are low voltage batteries designed for residential applications.
- Nominal voltage of 51.2V
- Compatible with GW xx00 S-BP, GW xx48-EM
- 10 Years warranty
- Available sizes: 5.4 / 10.8 / 16.2 / 21.6 / 27 / 32.4 kWh;
SKU: n/a -
Huawei, Storage Battery
Huawei LUNA2000 – smart string battery – 5/10/15 kWh
Lithium batteries for photovoltaic storage. Modular system with 5 kWh stackable battery packs with 100% discharge capacity.
- Modular design of 5kWh, 10 kWh and 15 kWh and parallelable up to 2 systems for a total of 30 kWh
- 10 year guarantee
- Configurable with Huawei Hybrid Single and Three Phase Inverters
SKU: n/a -
Huawei, Storage Battery
Huawei LUNA2000-7/14/21-S1
Storage system with 6.9 kWh LFP cells, modular solution with the possibility of stacking up to three battery packs per tower with a maximum capacity of 20.7 kWh parallelable up to 4 towers for a total of 82.8 kWh.
Huawei inverter compatible batteries:
- SUN2000-12/15/17/20/25K-MB0
- SUN2000-3/4/5/6/8/10KTL-M1
- SUN2000-2/3/3.68/4/4.6/5/6KTL-L1
SKU: n/a -
Jinko Solar, Storage Battery
Jinko Solar: Sungiga – all-in-one cabinet for C&I applications
The Sungiga JKS-215KLAA-100PLAA is an all-in-one energy storage solution which packs battery modules, BMS, PCS, fire suppression systems and liquid cooling in a single cabinet.
- Capacity: 215 kWh
- Charge/discharge power: 100 kW
- Liquid cooling
- Integrated fire suppression system
- IP 55
- Cloud-based monitoring
SKU: n/a -
LG Energy Solution, Storage Battery
LG Energy Solution PRIME – high voltage – 10H/16H
LG PRIME offers maximum safety for electricity consumption regardless of external uncertainties, achieving energy independence through the conservation of self-produced and eco-friendly solar energy.
- It works in temperatures ranging from -10°C to 50°C, so it is suitable for any type of weather conditions.
- The installation can be done both on the wall and on the floor.
- Available sizes: PRIME 10H, PRIME 16H.
SKU: n/a -
LG Energy Solution, Storage Battery
LG Energy Solution RESU – low voltage – 6.5/10/12
LG Energy Solution with RESU battery packs 48 V provides the most advanced solution in the market with regard to lithium-ion view the best energy density, high quality and reliability.
Three levels of basic skills from 6.5 kWh, 9.8 kWh and 13.1 kWh with expandability up to 26,2 kWh.
- Compact size and easy installation
- Better energy density in the world
- Tested safety
SKU: n/a -
LG Energy Solution, Storage Battery
LG Energy Solution RESU – high voltage – 10M
High-voltage residential battery with modular design consisting of two battery modules and a BPU (Battery Protection Unit), which make it extremely handy and easy to install.
- battery module weight 36Kg, total weight with all three parts combined 80 kg
- extremely small size: base 45cm x height 51cm and 24cm deep
- compatible with Sunny Boy Storage 3.7 inverters
- RESU10M energy 9.8 kWh
SKU: n/a -
Pylontech, Storage Battery
Pylontech H48050A lithium battery HIGH voltage
The Pylontech H48050A lithium battery is the module that connected in series allows to obtain storage systems with different types of working voltages and storage capacity, depending on the application. The system consists of a control module and several battery modules.
- 4.8 kWh energy for single-phase systems and 9.6 kWh for three-phase systems
SKU: n/a -
Pylontech, Storage Battery
Pylontech RACK CABINETS
Pylontech Rack cabinets painted with polyester powder, suitable for Pylontech batteries.
- Single section cabinet painted in polyester powder, embossed finish with ventilation grilles in RAL 5011 and RAL 5021
- Adjustable feet kit for wardrobe
- Pylontech / inverter connection cables kit
- Back brackets for battery support included for cabinets from 9U to 42U
SKU: n/a -
Pylontech, Storage Battery
Pylontech US2000 lithium battery
The Pylontech US2000 lithium battery module is suitable for making small and medium capacity storage systems.
- From 2.4 kWh
- Up to 16 units without parallel module.
- Modular to create storage systems even of large dimensions.
- Soft-start mode: reduces the peak current when the inverter has to start with only one battery.
SKU: n/a