Spot on about measuring — I made this mistake with my first setup and it cost me. Don't just go by manufacturer specs; they're optimistic at best.
What I'd add: factor in your inverter losses.
The sentence cuts off mate, but if you're consistently undershooting even accounting for the 150/60's limits, check your string voltage—if it's sagging below the MPPTs operating window, you'll...
The 48V setup is definitely the way to go for a space that size. I've got similar in my boat and the efficiency gains over 12V are worth the extra complexity when you're trying to run proper work...
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