Michael, I'd also be interested to know how to turn the constant voltage down a bit.
I have an NG5 to charge my 144v of buddy pairs. I end up NEVER leaving it to finish by itself because of the same issue that you mention. Where do you have the finish current set? I set mine lower to keep the equalizing current at 2.4 amps instead of 4. I don't trust the current to split equally between the buddies ( and it doesn't). This also sets the end-of-phase 2 current to be a total of about 1.2 amps or .6 amps per battery. Often the current goes down to 1.6 amps or so, then turns around and increases. It's a shame that Zivan didn't put a bailout for increasing current in phase 2. Over my 300 cycles, I've found that my pack is kinda on the edge for the charger finishing properly: 1. When I charge on cool days, it will almost always go through the whole cycle. 2. When I have only a light discharge, it will also almost always finish (<25 A-H). 3. The charger seems to do some extra stuff before it switches. I see some oscillation-like fluctuations in the ammeter before it switches phases. Sometimes it doesn't switch, goes lower in current, and still doesn't switch. I don't know what's going on here. Most of the time I'm happy to avoid the equalizing phase. If only it would turn off then... Like you, I would have trouble saying that the batteries are even slightly warm (on the outside) when this situation happens. It must not take much. Ken Lange
