We do not recommend fitting an inverter to the J35 / BatteryPlus35 battery management systems. The J35 is limited to a total of 20A (J35A, BatteryPlus35-II-SI, BatteryPlus35-II-SR, BP35-PM) or 35A (J35B, C and D as well as BatteryPlus35-II-HA). When an inverter powers an appliance, the current draw from the inverter is typically much larger than the current supplied by the battery management system.
You may fit an inverter directly to the battery. To ensure that your battery management system and monitor see the current drawn by the inverter, you need to install BMPRO’s BC300 External Shunt + CommLink to the battery.