VICTRON ENERGY BATTERY MONITOR BMV700 DIGITAL VOLTAGE POWER METER BAM010700000R
Power consumption: 4mA @ 12V (2.9Ah / month) - without relay or backlight. Relay: 60V, 1A NO (can be inverted to NC). Battery capacity: 20-9999 Ah. Shunt mounting holes: 5.8mm dia. (101.5mm between centres).