rmay635703 wrote:On ... the Volt you can inject a small amount of current 300-1500 watts) through the 12v (which isn't metered, I have done that mod myself)
Thanks Ryan, I was unaware of that method. Are you saying that the Volt dc-dc converter will reverse the current flow and start recharging the traction pack if the dc-dc sees higher than normal voltage on the 12V side, say 15-16V? Or is it just that by connecting a battery V higher than the 13.8 float voltage you unload the dc-dc and run all 'house loads' off of the supplemental battery?
Injecting 1 kW continuous could be just enough extra power on the West coast electric highway to skip a CHAdeMO stop here n there.
If just unloading the dc-dc converter is the goal, replacing the house lead battery with four LiFePO4 cells would help if those are grid-charged to 15.2V (3.8 Vpc) and floated by the dc-dc way down at 12.8V (3.2 VPC, which would use about 80% of the capacity of those cells). Just floating it at 13.8V, which I think is the i-MiEV setting, would not actually cycle the battery, so you'd need to disconnect the dc-dc during driving and reconnect during recharge. I don't know what sort of side effects there could be to disconnecting the dc-dc, and for that matter, don't know of a way to reprogram the voltage setpoints in our dc-dc. In the homebuilt EV world, this technique is relatively easy.