The installation manual for the ULPower engine has several diagrams for how the electrical system is recommended to be set up. It is different than the Aerovee in several aspects.
- The starter and regulator shall always be directly connected to the battery (no switches or fuses).
- The battery is in parallel with a huge 65k micro F capacitor.
- The battery is recommended to have an isolation switch.
The ECU have a separate on/off switch and ignition switches. The fuel pumps have an option to have relays that are governed by the ECU. In addition each one has a manual switch. The idea of ECU governed switches is that they will be "on" whenever the engine is running, and will shut of the fuel when the engine is stopped. In an accident they will shut off automatically. If only one pump is used, the whole system runs automatically. I'm not sure that option is a good idea, it also means each pump relies on two relays to work.
Further, the ECU has a CAN bus where most data are sent. I believed this would enable direct link to the CAN bus on the MGL EFIS, but that is apparently not the case. An additional MGL ULP DAC has to be installed. This box talks to the ECU, but transform the data to some pseaudo analog data before it sends them to the EFIS/EMS on the CAN/RS232 bus. Seems a bit odd to me.
EGT, CHT and MAP are not send by CAN bus. A normal XDAC is needed for those. Seems that I need yet another "box". Where to put them all?
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