Hi Brad,
Solar is a tool. So, the question you have to ask...which everyone has pointed out...how will you use it? What is that worth to you?
I personally think solar is an awesome addition. Installs can run the gambit...and you have to decide what it is you want to get out of it...and understand the limitations which can impact it’s ability to meet your needs.
Redundancy. Usually, something that is redundant is unnecessary. But, when it comes to taking care of your investment in batteries...redundancy is GOOD!!! Has anyone had a problem or outage on a shore power connection? (Me!). Has anyone had a mechanical problem that caused the generator to quit or fail to start? (Yep...Me, again!). So, there are from time to time situations that arise that take away your ability to keep those storage devices charged up. Solar, doesn’t need fuel, oil, or anything other than the sun. Having a redundant source of charging can really come in very useful.
Expanding opportunities. There are times you might want to enjoy a holiday away from the usual “Park” situation. Boondocking on the BLM land...a parking lot at the Albuquerque Balloon Fiesta...a field for an International FMCA rally... Whatever the reason, solar can really help you enjoy the whole experience by having to rely less on the generator. Making it easier to comply with quiet times. Being a good neighbor and not puffing fumes into the front door of the coach next to you. If your installation allows...adding to a 30A drop and still being able to run both air conditioners on a hot day at a Rally or in a State Park with 30A infrastructure.
But there are limits. Solar is only as good as the suns availability. Output can’t be expected to be pristine when it’s dark, rainy, under a canopy of trees, at a northern latitude with the sun low on the horizon. If you do most of your rving in these conditions...then solar will be a weak performer.
Size and installation. There is a lot to be said for planning. Knowing your needs is the first crucial step. Installing a shunt based battery monitor is a great way to survey your rig...to see what it consumes. After installing one of these devices...zero out the aH counter...and unplug. Use your coach the way you normally would...and jot down aH used over intervals of time. You can also look at the Amp demand in real times...and flip components on/ and off to get a reading in how much a particular electric component uses. If you know in advance what you will need...it makes it much easier to design a system that you will enjoy. The battery monitor will always be a valuable tool for as long as you own the coach. So, it’s a great first step.
Well...If something I said rang true...then solar might be the ticket. But, there are plenty of folks that prefer alternatives, and label solar a ridiculous waste of money. And they are right too. It all depends on your perspective...