Is this the EmonPi Shield? https://shop.openenergymonitor.com/emonpi-shield-kit-no-enclosure/
Do you have anything else reporting (an EmonTH for instance).
If not, you do not really need the EmonBase, it could all be done on the one Pi.
BT is disabled because of the UART port sharing on the EmonPi. This is something I profess to not fully understand - @pb66 is better placed to do that.
Have you looked at the other threads regarding this inverter?
Searching here gives 2 results that may help
- Multiple problems w. EmonTx and RFM69Pi - #24 by pb66
- emonHub ttyUSB0 USB serial adapter - #10 by pb66
The simplest way may be to use a USB Bluetooth dongle.