Following on from my comments elsewhere , I was hoping to design an open source low cost external alternator regulator
( there is already an Ardunio open source but itís the forerunner to the wakespeed and is rather over complex )
I intend to use either an NXP or Infineon dedicated regulator
IC. These run at around $12 in one offs.
These provide basic PI ( proportional integral ) regulation and field coil current
control with pwm. They incorporate startup procedures and engine
load balancing to help prevent hunting , and can sense field coil currents , all in a simple 5 lead TO220 package
They have a LIN interface so are fully controllable
Hence adding a simple micro ( probably ATTINY series ) then could be added to effect specific controls needed for a boat
( as an alternative I was thinking of using an ESP32 which could be extended to add Bluetooth configuration )
What minimal features do we need for boat
(A) programmable voltage set points and or LA charging
(b) external current
temp sensing ( the regulator ic can actually do that itself and could be bolted directly to the alternator , but probably best left as the ambient sensor
temp sensing ?
(E) people have mentioned the need to easily switch between current settings ( say a programmable high low switch )
is opening up its Bluetooth advertising protocol using the GATT profile , this opens up battery
temp , current and voltage sensing via Bluetooth.
Iím leaning towards Bluetooth even though it means writing an app to handle reporting and setup
Iíd also like to try and make it compatible with the Victron
infrastructure ( ie build in Ve.direct )
So is there consensus on what a simple regulator should be capable of
For me the biggest cost is setting up a bench based alternator to test this. Iím looking at acquiring a 1.5 HP motor
and fabricating a test rig. ( scrap car alternator )