CrifasRF...how will you know when your batteries reach 50% and need to be recharged. How will you know when they are 100% recharged. How will you know if you can make it through the night or day at your present amp usage? How many net amphours did the sun give you today? How much will new batteries cost you vs. a monitor?
Most batteries are murdered...they don't die natural deaths unless you have the tool to maintain them properly. This isn't important so much if you plug in all the time. It is quite important if you boondock. Potter owners understand utility!! This is NOT an option unless you like throwing away batteries WAY prematurely.
Oh...and a Fluke will NOT give you ANY of the information I asked at the top of the post since it cannot measure those parameters. He is right about Mr. Peukert though...and they won't take a charge as fast either.