In FWC's defense, Zamp calls for #16 to #18 wire for a <0.9m run to battery from the
ZS-15AW like I also have. Their 30 amp controller
manual recommends #6 or #8 wire for a < 1m run. Wiring diagram is on or about page 4. I think the wire run may be close to that length on my Hawk but that seems like a big wire size difference.
The manuals show what voltages are used to charge the battery in the various stages.and they seem low, especially given the + or - 0.2v tolerance.
Paul.
I certainly did not mean to imply FWC was doing something out of the ordinary or not in accordance with the manufacturer's (Zamp) specifications/instructions.
I read the manual in its entirity. I noted the wire gauge as well. HandyBob has quite a different take on the wire guage between the controller and batteries. HandyBob (an EE) seems to believe 10GA, or perhaps 4GA on a bigger battery array is called for between the controller and batteries.
I have an email into Zamp asking about "FUL(L)" display at 13.6V for float charge mode. My question/concern, is the Zamp ZS-15AW designed for an array (2 or more) of batteries? If so, how do you get the controller to charge an array of batteries to 14.7V? Optima has already replied that 14.7V is the required charge for an array. If the Zamp controller is activating float mode at 13.6V with an array, then my Optima AGM D27M batteries are not being fully charged according to Optima. However, 13.6V is the Float charge threshold for the Optima D27M as well, in a single battery setup.
I simply do not know how the Zamp controller is operating or maintaining my battery array without a battery momitor installed. I did note it is a 5 stage controller. Unfortuantely, Google can not find a listing of the 5 stages.
Of note, my MinnKota Digital Charger on my boat bulk charges my AGM Blue Tops to 80% capacity. Then enters absorption mode allowing up to 14.7V followed by <1A maintainer mode. The unit senses how many (up to 3) batteries are attached to the unit.