[RE-wrenches] Parts List For AC Couple Disconnect

[William Miller]

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-bounces at lists.re-wrenches.org] *On
Behalf Of *Mark Frye
*Sent:* Saturday, November 2, 2019 7:32 PM
*To:* re-wrenches at 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 at 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



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