pnichols wrote:
With any kind of charger (solar, converter, etc.), whenever the ammeter reads zero with charging voltage applied to them it means that the batteries have been fully charged.
Yes. A good solar controller will already have ammeter. There is no need in separate monitor to tell you how many AH to full when it's full. People forget that this is the very purpose of charging system - making it full.
When it's full on most days, there is no need to "guess" how many AH you removed from the battery. Many people have loads pattern so simple that after a few weeks they can tell - within few AH - how many AH they will remove today after it's been full, and again, this doesn't matter if it will be fully charged tomorrow.
When energy budget is tight, and you're afraid that battery might drop below 50% - you may need AH-counter. Short-term camping tends to be more chaotic, people can't keep tabs on things and need AH-counter. Voltage under load can be difficult to interpret.