Battery monitor design

[SilentHerd]

Hello,

I recently designed a battery monitor however I keep getting a simulation error that I have spent days on but cannot resolve. I have checked the individual subcircuits and they all seem to work fine individually. However when joined I get errors command.

The design consists of 2 main sub-circuits:

1.The first compares the reference voltage with the input voltage from the  bridge and uses to non-inverting comparator to compare the input voltage with reference to turn on LED indicators. At a certain input voltage it should actuate a relay.

2.This is a simple battery level indicator which actuates a relay

I have no clue what's happening, either the circuit is  wrong or its a bug  would appreciate some insight.

[anasei]

Dear SilentHerd,

By disconnecting this ground the simulation doesn't give an error(see attached image). However I am not sure why. As an advice I'd say that if you are connecting digital power source to OpAmps  you should also connect it to the digital ground if you want to connect to the ground. Also you use VDD, VEE and VCC, is there any particular reson for using these 3? If no I'd suggest you changing them all to one type, I don't think that's a big problem but still might be a reason for an error. Keep me updated and good luck!!!

Best,

Anasei.