I purchased a TrueCharge 40 to replace the original Guest unit before it packs it in and takes the batteries with it. I got a factory reconditioned unit with warranty at a good price.I also have the remote panel and temp sensor, and I have a question about the remote. I currently have an analog battery voltage meter that can select bat1 or bat2. I have two house banks but generally run them as one, total 440 AH. The TrueCharge remote displays battery voltage and is selectable for two banks. My question is: Does the TC 40 remote display battery voltage all the time or just when the charger is powered? Dwains/v Dancy