Derek/Greg. The L7805 I used on the master is just a bog standard series regulator and can accept any voltage upto about 35V ish at the input. It may need a very small heatsink if you use a higher input voltage as you are burning off a bit more power.
However the power input also feeds the relay driver transistor at the input voltage, so it means the charger cut off relay output J7 would be the same as your input voltage. The BC337 can stand about 45v so that should be OK at 24v.
Why do you need to use 24v, can't the Master be supplied from the normal car 12v aux?
It's very interesting about the need to delete the REM stuff from V1.08, I'll fire it up in my editor tomorrow and try and find the issue.
![Crying or Very sad :cry:](./images/smilies/icon_cry.gif)
Bad news about the e-meter
Greg, Derek has jut piped you for my 500A current sensor
![Sad :(](./images/smilies/icon_sad.gif)
Sorry.
The Master current sensor input accepts a 0-5v output device.
It must not be allowed to go negative or over +5v.
I used a Hal 400S device in my previous vehicles but there may be something more suitable now. Are you using regen?
I do have a circuit to condition the output from a -5v - 0 - +5v type sensor so that it provides an ouput in line with the current master/software, i.e. 0-2.5-5v, with 2.5v being 0A or zero. 0-2.5v is discharge, 2.5v-5v is charge.
This gives a resolution of about 1A on a 500A charge/discharge setup.
Peter