We live off grid full time except when out with one of our trailers. I couldn't be bothered to put together a good system. We use a 100 Watt folding suitcase type with sketchy pwm controller and it works just fine for our needs and I suspect would for most people with only single group 24 or 27 batteries. The best route to go is conservation and have an idea of what power you are using.
Now what wouldn't I do
1. Replace the nice mc4 connectors that come pre-wired with the system and replace with regular wire. Ideally you should be using stranded copper wire not solid copper..
2. Mount the controller near the battery but not over it it's lithium ion or possibly agm but definitely not flooded lead acid - you take a chance of corroding the charge controller with the gasses.
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