The BMS lockout is spot on — you can't argue with physics there. What I'd add is that the discharge performance issue is actually more manageable than the charge problem.
I've got a static caravan...
The reality check is spot on. I'm three years into my static caravan setup now, and year one was definitely about finding your rhythm with the seasons.
Depends what you're actually trying to power, tbh. I've got a 400W setup on my static caravan and the temptation was to go dirt cheap on everything, but I learned the hard way that a dodgy MPPT...
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