Classic Aux 1 relay current specifications.

Started by WillEert, March 02, 2021, 09:51:43 AM

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WillEert

I want to run a vent fan for my battery box but the wattage requirements exceed the 200ma the Classic provides. The fan needs 12 Vdc to operate. The Classic owners manual (page 40 RevK) gives the Aux 1 Dry Contact specs as: Dry Contact 1A max. I am interpreting this as if the Aux 1 is set up as a dry contact (JP 6& 8 on right hand pins) then I can connect up to 1 amp of load to the terminals and it will switch it on and off using the selected logic. Is this correct? Thanks for any replies.

Will

(1)24 ET 185 mono, Classic 150,8x Surrette 6CS25p, 4x Magnum 4448, homecooked diversion system;(2)15 Heliene 330 mono,Classic 150;(3)2X6 Hansol345mono, 2 stand alone Hotspot ACDC12C Minisplit heat pumps.(4)15 Hanwha Q cell 400 1/2 cell, Classic 200: (5)1X6 HanwhaQcell 400 1 Hotspot minisplit ACDC18C

ClassicCrazy

That makes sense to me but you will have to wait for the experts to confirm !
You could always use the 12v from Aux1 to run a relay if you needed to .

Larry
system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system 2
 5s 135w Kyocero , 3s3p 270w Kyocera  to Classic 150 ,   8s Kyocera 225w to Hawkes Bay Jakiper 48v 15kwh LiFePO4 , Outback VFX 3648 inverter
system 3
KID / Brat portable

WillEert

Hi Larry,

Thank you for your reply. I could use a relay as you suggest but if I don't have to go through the process of sourcing, installing and maintaining one then that is another advantage of the Midnite Classic.

I have been using a passive venting system, which seemed to be working well. It depended upon hydrogen gas being lighter than air which could be vented out the top vent in the battery box. Make up air was fed into the bottom of the box via a pipe that entered the top of the box. I recently became aware that FLA batteries that have antimony in their plates can evolve, among other things, Stibine gas  (SbH3) at higher charge rates. My batteries have antimony in the plates. Stibine gas is explosive at certain concentrations and is also about 4 times heavier than air - so it will accumulate in the bottom of the battery box. It can create health issues. Reading the battery manufacturers recommendations they recommend active venting for the batteries I have. So my thought is install active venting on the discharge line. I will also increase the length of the discharge pipe in the box and perforate it in the hope that it will remove gas from any height in the box. I have operated with the existing system for about 10 years now with no events however " an ounce of prevention is worth a pound of cure". In retrospect I should have read the manufactures recommendations for installation more closely.

Will

Will
(1)24 ET 185 mono, Classic 150,8x Surrette 6CS25p, 4x Magnum 4448, homecooked diversion system;(2)15 Heliene 330 mono,Classic 150;(3)2X6 Hansol345mono, 2 stand alone Hotspot ACDC12C Minisplit heat pumps.(4)15 Hanwha Q cell 400 1/2 cell, Classic 200: (5)1X6 HanwhaQcell 400 1 Hotspot minisplit ACDC18C

ClassicCrazy

Will,
You sure have a very neat setup there !
That kind of free clear space never seems to stay long around here .

Larry
system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system 2
 5s 135w Kyocero , 3s3p 270w Kyocera  to Classic 150 ,   8s Kyocera 225w to Hawkes Bay Jakiper 48v 15kwh LiFePO4 , Outback VFX 3648 inverter
system 3
KID / Brat portable

WillEert

Larry - You are right. Those photos were just after the initial install. It now has two more Classics and another inverter. I don't like dangling wires but after adding diversion control boxes, car chargers etc now have some wires that need cleaning up. The vent fan wiring will have to be integrated into the mix now also.

Hopefully switching 12 VDC & .3 A for the vent fan will work with the AUX1  as I would prefer not to have to install another relay. I guess all I can do is try it and see what happens. I don't know how else to interpret the specs other than Aux1 will switch this current and voltage.

Will
(1)24 ET 185 mono, Classic 150,8x Surrette 6CS25p, 4x Magnum 4448, homecooked diversion system;(2)15 Heliene 330 mono,Classic 150;(3)2X6 Hansol345mono, 2 stand alone Hotspot ACDC12C Minisplit heat pumps.(4)15 Hanwha Q cell 400 1/2 cell, Classic 200: (5)1X6 HanwhaQcell 400 1 Hotspot minisplit ACDC18C

ClassicCrazy

Will ,
I found these posts about aux1 dry contacts
http://midniteftp.com/forum/index.php?topic=4692.msg43701#msg43701

http://midniteftp.com/forum/index.php?topic=1130.msg8697#msg8697

Looks like you will be good to go with using Aux1 dry contacts  for up to  1 amp 12v load

Larry
system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system 2
 5s 135w Kyocero , 3s3p 270w Kyocera  to Classic 150 ,   8s Kyocera 225w to Hawkes Bay Jakiper 48v 15kwh LiFePO4 , Outback VFX 3648 inverter
system 3
KID / Brat portable

boB


Remember that there is also a PTC resistor in series with the relay contact that will limit the current to slightly less than 1 amp.  This is to protect the very small relay.

I  seem to remember that it is good for maybe 750 mA but might be slightly lower than this even.

K7IQ 🌛  He/She/Me

WillEert

Thanks for the replies Larry and Bob. The Crydom selection tool is a handy item. I use a Crydom Evolution Dual SSR's for diversion into the HWT. I like them.

I will go ahead with the plan for dry contact switching the 12Vdc I need for the vent fan. With any luck it should be in service in a couple of weeks.

Will
(1)24 ET 185 mono, Classic 150,8x Surrette 6CS25p, 4x Magnum 4448, homecooked diversion system;(2)15 Heliene 330 mono,Classic 150;(3)2X6 Hansol345mono, 2 stand alone Hotspot ACDC12C Minisplit heat pumps.(4)15 Hanwha Q cell 400 1/2 cell, Classic 200: (5)1X6 HanwhaQcell 400 1 Hotspot minisplit ACDC18C