If using a 50A or 100A version, you must use an external shunt . Powering it without one can cause the display to malfunction or the board to burn.
HKS-VA028-V2.0 is a specific hardware revision for a digital DC voltmeter and ammeter hks-va028-v2.0
hks-va028-v2.0 appears to be a specific technical identifier, likely a firmware version , hardware model number , or product SKU . If using a 50A or 100A version, you
Checking the charging status and battery voltage in off-grid solar systems. likely a firmware version