Long term storage

[wme]

OK I know what everyone says for storage, 60-70% and charge every 6 months.
BUT I have a home made solar generator 100ah Lifepo4 and a 700w inverter, it is for medical equipment during power outages. I have this charger...https://www.amazon.com/Lead-Acid-Portable-Maintainer-Desulfator-Motorcycle/dp/B09ZLD6RJ5/ref=sr_1_6?crid=2HHDUX7PT8K8U&keywords=lifepo4+battery+charger+12v&qid=1695833540&sprefix=lifepo4+battery+charger%2Caps%2C186&sr=8-
6&ufe=app_do%3Aamzn1.fos.006c50ae-5d4c-4777-9bc0-4513d670b6bc
Between the battery BMS and this charger on the low amp setting can I leave things plugged in??

 

[MisterSandals]

Between the battery BMS and this charger on the low amp setting can I leave things plugged in??

The manual does not specify if there is a float voltage for LiFePO4. To me, it suggests that it will "charge" LiFePO4 but not "maintain" (float at a reasonable voltage).
So the question becomes whether the 5A minimum charge holds the battery at 100% charge (bad) or not. You may need to try it to see where it stops charging and the maintained voltage actually is.

You will likely have conflicting goals: maintain a high state of charge/readiness vs. maintaining a storage voltage to preserve battery longevity.

Since it is for medical equipment, it sounds like you should favor high state of charge and ensure YOUR longevity (i'm not a doctor but i'd value my life over my battery's life).

 

[wme]

The charger, charges and reaches "full" and stops charging. I'll check resting voltage and may be leave things where they are and put a load on the inverter and see if the charger restarts and at what % of SOC.
Plan B would be an adjustable v power supply set to ?? voltage.
The battery at 100% SOC will run the med equipment for 10 hours, so close to 100% is VERY desirable.
I guess plan C would be a bigger battery

 

[MisterSandals]

The self discharge should be around 2% a month. Is there a reason that you could not charge the battery once every few months?
"Hey Siri, remind me in 2 months to recharge my battery."

I guess plan C would be a bigger battery

You get to choose how long your med equipment will run depending on your battery(s) capacities and state of charge.

 

[MisterSandals]

The battery at 100% SOC will run the med equipment for 10 hours, so close to 100% is VERY desirable.

Have you actually tested this to see or is this a guess? If you're using an inverter, have you factored in the ~15% loss from inverting from DC to AC?

If this is a CPAP, have you checked to see if it will run from a DC power supply (does your power cord have an inverter built into it?)

 

[wme]

I have a 12v cord for the CPAP and it does use less power that way. The rest of the mess requires AC, so I have to run the inverter.
The verified run time is 10 hours +. So calculating a 10 run time gives me a warm fuzzy.
A monthly top up seem to be the simplest answer, as you said compared to a hospital visit a battery is cheap