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Haven't dealt with them personally, but if the info on their website is any indication, they should know what they are doing.
You should look at the DIY info on their site to give you an idea of what you want in advance. Run their off grid solar load calculator to see much solar you'll need, then speak with them about it to see what they recommend. Make sure you fill out the minutes & hours info for what you plan to power. The installer might want to redo the numbers after asking you some questions, so consider that calculator a starting point.
If you are installing a small system, make sure to charge controller you get isn't maxed out with the number of panels you are buying, just in case you decide you need more.
If you ever plan on adding over 200 watts, I suggest going to at least 24 volts for the battery bank, which also means you'll need a step down converter to run the standard DC stuff. Just remember, if you plan on switching to a higher voltage in the future, it's better to just buy the right components the first time around than having to do it all over again.
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