Quote:
Originally Posted by C.Martin
I'm hoping to learn enough about these Lithiums to incorporate them when my FLA need replacement.
This thread brings up an important aspect about management. The cold.
Having a combination Inverter/Charger (MS2812) means that if low temp cutoff is reached...I loose a lot of stuff...the dc loads could remain discharging...but all of my Inverter loads ie...important stuff would be shutdown. So, it cetainly motivates me to keep the batteries in the zone to keep working.
Due to all the slideouts it isn't practical for me to mount batteries within the living area. I'll be insulating and sealing off the existing battery compartment.
The 60w light bulb is a good idea. I might add an outlet so that I could choose to put it on a temp relay, or WeMo outlet that could be controlled remotely.
Eventually, I would like to explore the possibility of placing an Oasis heat exchanger in there with it's own thermostat switch...like the one in the wet bay. That would make sure it is ready to work without any action required on my part. We normally keep Oasis going when sub freezing temps are expected.
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Why would you lose inverting if the temp is below 32f? I personally have not had my system shut down charging due to the cold or any other protection in place.
I suppose it depends on what/ how you're going to implement your bms.
For instance on the Elite GBS I'm using it has it's own safe guards in place... these protect the LFP batteries.
There are seven alarms:
- Over voltage (highest cell is over 3.8V after a 3 second delay)
- Under voltage (lowest cell is below 2.8V after a 30 second delay)
- Over current (current exceeds 10C for 10 seconds)
- Over temperature (highest cell exceeds 150°F or 65°C)
- Under temperature (lowest cell is below 32°F or 0°C, charging is not allowed)
- Ground fault (There is a high voltage leakage greater than 2mA to the chassis pin)
- Unmanaged cells (The programmed number of cells does not equal the number of cells read)
If it's below the allowable temp for charging the battery bms/cpu just doesn't allow charging, but you're still using the batteries so why do you think the inverter won't be functioning?
The Magnum is controlling just what you program it to do, the batteries bms/ cpu should be protecting the battery cells.