SPH Energy Storage System
Unlike traditional feed-in tariff inverters the SPH allows both the ability to feed-in to the grid, but also energy storage to allow for a full self consumption or off-grid system. The expandable Lithium Ion Battery provides the energy storage medium, with the SPH providing the control, configuration and inverter functions. A comprehensive LCD allows full configuration, as well as monitoring and control over WiFi and from cell phone apps.
The SPH Energy Storage and inverter system is G83 Certified.
Energy Independence Capability
As the sun rises, the Photovoltaic (PV) array will start to increase it’s power output. This energy is used to start charging the Li-Ion battery and provide power to the load.
Around noon when the PV is at it’s highest output and the battery is fully charged, the excess power generated can be fed back to the grid, earning revenue under the feed-in tariff.
As the sun sets and PV output falls, energy output to the grid is reduced until power to the load is provided from the battery. Alternatively, where cheaper “off-peak” electricity is provided this can be used to recharge the battery ready for the next day.
The SPH is to be wall mounted along with the matching battery pack(s). Wall mounting brackets are provided which are connected to the wall first. The battery and inverter are simply hooked onto the brackets and secured with bolts.
Electrically it is recommended the unit is wired to a bespoke Power Distribution Unit to be supplied by the installer, or requested as an additional extra.
The PDU consists of several circuit breakers or switches:
K1: Main Grid Switch
K2: Non-Essential Load Switch. Equipment here is not protected by the SPH. May also contain high current equipment beyond the capacity of the SPH.
K3: SPH Grid Switch Input.
K4: SPH Load Switch Output.
K5: Bypass Switch. Connects Grid directly to essential load. Normally open and only used for continuity of power when SPH is down for maintenance.
K6 would generally be external to the PDU, near to the solar array. K7 is for an alternate battery to that commonly used.
The internal transformer is an option where high earth leakage protection or isolation is required. Generally, the output neutral would be connected to the PE conductor. Additional MCB or RCCBs may be added.
Connection to the SPH are made on the underside. They are as follows:
- BMS: Connects to the battery communication port.
- BATT: Battery Power Connection.
- PV1+,PV2+,PV1-,PV2-: Connection for solar array.
- AC Startup: To allow SPH to start without solar or battery – must have AC input.
- WiFi: Connection for WiFi antenna.
- AC600/30A. Fuse.
- Igrid: Connection for current transformer (CT) to measure grid current.
- RS485 PC: Either connect to wireless collector, or software monitoring on PC.
- USB: Export historical data or upload/download configuration to PC.
- RS485 Meter: Connection to smart meter.
- Load (L,N,PE): AC output connection to load
- Grid (L,N,PE): AC input connection to grid.
Configuration and Communication
The SPH can be configured and status seen directly from the 3.5″ colour LCD display.
The LCD is capable of displaying:
• Running status and information.
• Service and operation information.
• Warning information and fault display
Upon first power up the system will enter configuration modes that include setting the language (English, German or Chinese), set the date and time, and LCD brightness and on time settings.
In normal mode the LCD displays:
• System topology and energy flow;
• Voltage and current of real-time input, output and battery;
• PV power, grid power, load power, PV daily power generation;
• Alarm prompting;
• Status display;
• Date & time.
In addition to communication via RS485 and USB the SPH comes with built in WiFi. Provided software and Apps are available for both IoS and Android to allow remote monitoring and control of the SPH.