Does anyone have an opinion or has used something like this to monitor the batteries?
http://www.ebay.com/itm/DC-120V-10A-Voltage-Amp-Power-Ah-Hour-Charge-Discharge-Battery-Monitor-Indicator-/181142316463
OR
http://www.ebay.co.uk/itm/DC-120V-500A-Volt-Amp-Combo-Meter-Battery-Charge-Discharge-Indicator-With-Shunt-/170901504188
I bought one of these for a non-rv application. It needs setup information entered into it, which is ok, but I quickly found that the setup info is lost when the meter is powered down. Because of this I didn't use it, so can't comment on any of its other traits.