Will, thanks for jumping in.
Great to experiment a bit with the tech before installing. As Jason mentioned, lithium chemistry batteries are voltage sensitive: they don't like to be stored fully charged (40-80% good) and they die immediately outside their voltage range (high or low). This seems your main design constraint. If you can set your BMS to "storage" or around 60% charged voltage, then your planned solar system will likely last 20 years or more. Or just keep them topped off, and replace them every 2 years.
I use the MiniBMS on a LiFePO4 motorcycle. I have to manually interrupt charge for storage, then fully charge hours before I go riding. My AGM scooter is much simpler to keep fully charged and ready.
I use 50W solar to 12V 60Ahr lead-acid regulated by 4A MPPT charge controller on my 24' Cal 2-24 sailboat for the 36pound 12V Minn Kota trolling motor. I'm never hungry for electricity, though I could use a heftier electric motor. The biggest electrical rip-off is the trolling motors with the resistors in the nose-cone for speed control, wasting precious electrons (most of them). Use the more expensive PulseWidthModulated ones for 2 - 8 times the range.
In other words, if you have the room and weight capacity, a series pair of 100Ahr AGM deep cycle lead batteries is a more robust maintenance-free option. Slightly more maintenance (you add distilled water, not "demineralized" or "purified") but also more robust (because you can safely overcharge) is FLA (flooded lead-acid). Get a set from the same manufacture date, or better yet 12v charge them individually, rather than a single 24v MPPT charge controller. The two 12v chargers would not share "ground"!
Mark Stafford - grid-tie solar house, eGeo car, eKayak, eScooters, eMotorcycles, eSailboats
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Posted by: mstafford@natca.net
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