Voltage and Current Wallplate with Shunt Box for Portable PV Solar Power System A wallplate designed for installation in caravans, RVs and off-grid remote power installs.It displays the voltage and current of the connected battery. Ideal for monitoring the output of a portable PV solar power system. Included with the wallplate is a shunt box which connects directly between the battery and the load. The internal shunt is rated to 100A current and maximum voltage is 16V (suits 12V battery systems only). Shunt box size: 125W x 62H x 82Dmm.