Not nearly as dramatic as some of the other posts here but maybe some other can learn from my mistake of over discharging my cells.
I've got 4x 280ah EVE cells in series, SBSM0 from electrodacus just doing balancing and cutting off DC loads via a solid state relay (SSR-60 DD), then I have the MPP Solar 1012LV-MS, all installed in my van. 2x 195W eco-worthy panels up top.
The MPP Solar has it's own low voltage cutoff, I know Will showed hooking up a FET in parallel with the switch to turn it off but I found that switching it on and off wasn't much different that just using it's own programmable under voltage shutoff. In either case the inverter shuts off but the charger still works.
So I left the van for a 2 week paddling trip, dreaming of the cold beer I would return to, the battery was down to about 60% when I left due to the canoe blocking the panels for the drive to the put in. I assumed where I parked it would get enough sun to keep the fridge running, and if not everything would shut down at the programmed cutoff of 10% in SBMS0 and 10v for the MPP. Instead I came back to nothing working, very warm beer and my cells down at 1v each.
In further testing it seems the SBMS0 seems to draw about 50mA and the MPP pulls another 100 - 130mA (after the under voltage has kicked in) - both currents are from the SBMS0 measurement.
180mA doesn't seem like much but of course 24 hours a day x maybe 10 days = 240hrs x 0.18 = 43Ah being pulled from an already dead battery.
At least that is my post-mortem assessment, interested if others have a different take, or suggestion on how to fully disconnect the SBMS0 and the MPP Inverter Chargers.
I've got 4x 280ah EVE cells in series, SBSM0 from electrodacus just doing balancing and cutting off DC loads via a solid state relay (SSR-60 DD), then I have the MPP Solar 1012LV-MS, all installed in my van. 2x 195W eco-worthy panels up top.
The MPP Solar has it's own low voltage cutoff, I know Will showed hooking up a FET in parallel with the switch to turn it off but I found that switching it on and off wasn't much different that just using it's own programmable under voltage shutoff. In either case the inverter shuts off but the charger still works.
So I left the van for a 2 week paddling trip, dreaming of the cold beer I would return to, the battery was down to about 60% when I left due to the canoe blocking the panels for the drive to the put in. I assumed where I parked it would get enough sun to keep the fridge running, and if not everything would shut down at the programmed cutoff of 10% in SBMS0 and 10v for the MPP. Instead I came back to nothing working, very warm beer and my cells down at 1v each.
In further testing it seems the SBMS0 seems to draw about 50mA and the MPP pulls another 100 - 130mA (after the under voltage has kicked in) - both currents are from the SBMS0 measurement.
180mA doesn't seem like much but of course 24 hours a day x maybe 10 days = 240hrs x 0.18 = 43Ah being pulled from an already dead battery.
At least that is my post-mortem assessment, interested if others have a different take, or suggestion on how to fully disconnect the SBMS0 and the MPP Inverter Chargers.