Assuming this is not a solar site, and the battery runtime is sized for typical power company repair time plus enough time to bring out a portable generator, I don’t think a couple hours extra runtime is worth ruining the batteries. I know what would happen to me. I wouldn’t get the batteries replaced before the next outage, and now I’m really screwed.
One thing I’ve started doing at DC sites with DIN rail chargers is to make sure the charger isn’t hardwired but has a regular AC cord, so it can easily be plugged into a portable generator or other source of emergency power. From: Chuck McCown via Af Sent: Thursday, November 20, 2014 3:06 PM To: [email protected] Subject: Re: [AFMUG] Low Voltage Battery Disconnect I agree, especially on Solar. I swore off LVDs a long time ago. On the other hand, if you have frequent outages.... But in that case, put in larger batts and/or a generator. From: Sean Heskett via Af Sent: Thursday, November 20, 2014 1:54 PM To: [email protected] Subject: Re: [AFMUG] Low Voltage Battery Disconnect personally i prefer to damage my batteries to keep the network running than have it shutdown during a low voltage event. 2 cents On Thu, Nov 20, 2014 at 1:41 PM, CARL PETERSON via Af <[email protected]> wrote: I have a couple Emerson 211 Rectifier shelves without the LVLD. In order to protect my battery string, I am looking for a low voltage battery disconnect that will disconnect the battery string when voltage drops below ~42V and reconnect it when the rectifier comes back online so the batteries will charge. Any suggestions for a ~20A system? Thanks, Carl Peterson PORT NETWORKS 401 E Pratt St, Ste 2553 Baltimore, MD 21202 (410) 637-3707
