Got both on my static caravan setup, so fair bit of real-world experience here.
The degradation thing @SunnyFisher mentions is legit — my Renogy flexibles have definitely lost a few percentage...
Battery sizing's the key bit really. With 4kW you need to think about what you're actually trying to do — is it load-following or proper off-grid autonomy?
We went 10kWh usable on our setup...
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