Mark:
I think the task is to measure battery voltage and, if it gets too high, generate a signal to disconnect the AC coupled feed to the AC bus. Therefore the sample is DC, not AC. Simple matter of voltage dividing into an acceptable range. I submit that there are probably a lot of ways to skin this cat. For example a Trace C40 charge controller in diversion mode should give you a high state signal to open an AC relay on the grid-tied inverter AC output: BatteryàC40 in diversionàRelay on output of GT inverter The question is, what application is robust enough to allow adequate confidence? Some people with experience can “roll-their-own” and build solid assemblies that can handle the rigors of field use. If I am applying a solution to a remote site with a high requirement for reliability, I am looking for professionally manufactured off-the-shelf equipment. At home, I can Rube Goldberg as much as I want. William *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Mark Frye *Sent:* Saturday, November 2, 2019 7:32 PM *To:* re-wrenches@lists.re-wrenches.org *Subject:* Re: [RE-wrenches] Parts List For AC Couple Disconnect Glenn, OK, while I would prefer to not get into compiling code onto an ARM, my main question would be, how do you get the voltage value into the Arduino? Rectify the AC voltage and then voltage divide down to the chip input pin? Mark On 11/2/2019 10:14 AM, Glenn Burt wrote: Sounds like a job for an Arduino... -Glenn Sent from my 'smart'phone, so please excuse typos and spelling errors. ------ Original message------ *From: *Mark Frye *Date: *Sat, Nov 2, 2019 1:05 PM *To: *re-wrenches@lists.re-wrenches.org; *Cc: * *Subject:*[RE-wrenches] Parts List For AC Couple Disconnect Folks, Can anyone share a parts list for setting up a AC couple disconnect? I want to couple a non-frequency response grid-tied inverter to a battery based stand-alone inverter. I have only 8 amps output from the GT inverters, so can use 10A relay contacts. I want a device to monitor AC voltage and latch a coil on when it raises above a set point (250VAC). I then want a timer to release the latch after about 1 hour. Sound about right? Are any vendors selling such a device? How about a parts list from Digikey? Thanks, Mark Frye _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org <%20re-wrenc...@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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