Hi Roger, am I correct in thinking that the negative wire that goes to the battery, should be connected instead to the shunt. If this is so, surely the battery wire that Nasa provide to go from the shunt to the negative post on the battery is too small compared with the size of the wire that at present is connected to the negative post on the battery, also how do you connect this wire to the shunt. Perhaps if you have the system up and running on Playtime i could come and have a look to see how you did it….Ed Holmes Storm Dragon