Hardware four-piece set: an indispensable golden combination
Dual-mode inverter: a hybrid inverter that supports split-phase output must be selected. Its battery direct connection port can withstand Greater than or equal to 500V high voltage, reducing line loss by 60% compared with low-voltage systems
Smart battery cabinet: lithium iron phosphate battery packs must have a built-in BMU management system, and a single cluster capacity of Greater than or equal to 5kWh
AC coupler: realizes dynamic allocation of photovoltaic and battery power. In a farm case, this device reduced the abandonment rate from 35% to 8%
Automatic switching switch: must comply with UL1008 standards, switching time Less than or equal to 16ms (human eyes cannot detect light flickering)
Six-step system joint debugging method
<2° (otherwise it will cause circulating current)
Power allocation: set the battery priority charging threshold (It is recommended to start PV charging when SOC Greater than or equal to 30%)
Emergency circuit: Lay 6AWG cable independently to connect key loads (refrigerator/ventilator, etc.), physically isolated from ordinary circuits
Off-grid test: suddenly cut off the mains power, use power quality analyzer to detect voltage fluctuations (qualified value <5%)
Cooling layout: The distance between battery and inverter is Greater than or equal to 80cm, and the system efficiency drops by 23% when the ambient temperature exceeds 40 degree
Fatal mistakes made by 90% of users
Mixed battery types: Mixing lead-acid and lithium batteries causes the system efficiency to plummet by 40%
Ignoring PCS power: Insufficient capacity of energy storage inverter causes overload shutdown (needs Greater than or equal to 120% of inverter rated power)
Wrong grounding: The split-phase system must use TN-S grounding, and wrong grounding may cause a 150V potential difference
