I'm going to google the name you mention and see what comes up..... does it tell you amps remaining in battery?_____ and amps you are currently using?______
I realise voltmeters are limited but it's better than nothing and i can be certain i am charging when plugged in or towing.
Update: I just answered my own question and it does what i need it to do and more. Nice setup
Further Update: wow that thing is expensive but i guess you get what you pay for
DON'T PANIC! ( from a famous SCIFI series!)
Sometimes the XantreX Link 10 and 20 come up on eBay! The older units used LEDs instead of LCDs for the display, so they are still being cleared out.
I picked up an older Link 20 New Old Stock unit at less than $150 from an eBay store that was clearing them.
This may seem expensive, but is only twice the cost of the Doc Watson. I have 2 of those types of units and they do a good job, for 1/2 of what you need to know. They measure the voltage, and discharge, but don't include the charging!
If you REALLY feel that you 'need to know', then hold out for the Link 10 or 20.
They tell you lots, maximum discharge amp hrs of your battery, charge rate, discharge time at present rate, etc.
It compensates for your discharge rate (Peukart equation) which compensates to tell you a 'true' number of minutes that you will run on your battery, at ANY rate of discharge.
In other words, its a good 'Fuel Gauge' for your battery system!
Also, I use an Intellpower PD9260 Converter from Progressive Dynamics to feed my 2 Size 27 100 AHr AGM batteries. It does spit out some interference to my Ham Radio, but not too severe!
There's LOT'S of other info on a search under my name about Converters, etc.
I do enjoy really knowing how long I can boondock without power. It also tells me if I need to run my Honda Genny for a while!