360 recommends a 16 amp or greater circuit for the AC. And it will only make 7.5 amps. Almost any batter discharged that much will take 100% of that 7.5 amps when starting to charge. I would set the battery circuit breaker to be higher than 7.5 amps to prevent this problem.
From: Josh Baird Sent: Sunday, May 28, 2017 11:30 AM To: [email protected] Subject: Re: [AFMUG] Traco TSP+BCM Question This site has about 180-200W of load. The TSP power supply is 360W. I know the BCM has about a ~55W overhead for charging, so that should still leave plenty of headroom, wouldn't you think? On Sun, May 28, 2017 at 1:19 PM, Bill Prince <[email protected]> wrote: Might be as simple as your AC circuit is too small for the whole load. The key questions are (1) What is the load of your equipment?, and (2) What is the bulk charge load on your controller? Add those two together to understand what the total load should be. bp <part15sbs{at}gmail{dot}com> On 5/28/2017 9:19 AM, Josh Baird wrote: I have a site with a TSP+BCM 48V combo. Last night, something caused the AC breaker to trip, putting the site on battery. We didn't see the alert until about 12 hours later. At this point, the batteries were down to ~42V. When our guy arrived on site, he reset the AC breaker, and AC power was restored. Immediately, the battery breaker (breaker between positive side of the batteries and the BCM) tripped. Now, each time that we reset the battery breaker, it causes the AC breaker to immediately trip. At this point, the site is up on AC with no battery. Any ideas what would be causing this? Do you think the batteries are causing the BCM to draw too much current? Could one (or more) of the batteries be dead/bad? The site *did* run successfully on battery for nearly 12 hours. Josh
