Witch version of the DEXT to purchase?

[Allen Tindall]

I am thinking that I need the Control Contactor version but I just want to make sure.  I am currently connected as follows.

EXI03: Type 2 connected to Victron Energy Multi Plus 3000 Inverter

EXI04: Type 1 connected to Victron Energy Multi Plus 3000 Charger

EXI05: Type 2 connected to Victron Battery Protect 100 feeding Fuse Box

EXI06: Type 1 connected to 2 Channel 817 Optocoupler.

         The first Channel connects to Solar Panels

          The second Channel connects to a Renogy Battery to Battery Charger

The system works great but I Believe that the DEXT would allow me make a more reliable installation and get rid of the 2 Channel 817 Optocoupler.  The DEXT should also allow control of the Blue Sea 7713 ML-Series Remote Battery switch located downstream of the 400 Amp Main Fuse which is downstream of the Solar and Load Shunts.  Per Blue Sea, the 7713 control wire draws 13ma.  The following is what I think the connections and settings will be.

3A Type 4 set at 30% SOC connected to Victron Energy Multi Plus 3000 Inverter

3B Type 4 set at 10% SOC connected to Blue Sea 7713 ML-Series Remote Battery switch

4A Type 1 connected to Victron Energy Multi Plus 3000 Charger

4B Type 1 connected to Solar Panels

4C Type 1 connected to Renogy Battery to Battery Charger

5A Type 2 connected to Victron Battery Protect 100 feeding Fuse Box

[Allen Tindall]

Just discovered that I made an error in the above.  3B will be set at Type 5 to turn off the Blue Sea 7713 ML in the event of a low or high voltage error to prevent damage to the batteries.

[sailingharry]

I don't use the 7713,  I use a competing product by Aegis, but when I was researching them I came to the conclusion that they work the same way.

The power to actually operate the contactor comes directly from the battery terminal.  The control wire, controlled by the SMBS0, is small milliamps, and can be controlled by the SMBS0 or any contactor on the DEXT.  As such, you can use either version of the DEXT - you don't need the contactor version (which doubles up some components to give enough power to operate solenoid style contactors).

As a small aside -- your setup is rather close to mine.  I learned a bit that may help your wiring.  The Multiplus can be controlled by taking the "+" wire on the auxiliary contacts to ground.  Similarly, the BPs can be controlled by taking the "-" contact to ground.  This means that you can control these two devices with 4 wires (one for each control -- 3A, 3B, 4A, 5A, and possibly the 4B depending on how you are implementing that) rather than 8, and at the DEXT have a single ground point. It isn't a big deal, but it decreases the number of connections and spaghetti, especially in the Multiplus.

[sailingharry]

Oops.  Aegis is some sort of military thing (missile control?  I forget....). Egis makes switches....

[Dacian Todea (electrodacus)]

Allen,

You misunderstand how DEXT works.

EXT IO3 controls 3A and 3B so if you set EXT IO3 as type 2 or type 4 that is what both 3A and 3B will be sort of how you use the 817.

So you can connect as follow

EXT IO3 Type 2 (or 4)

3A  Victron Multiplus 3000 Inverter

3B  Victron BP100

EXT IO4 set as type 1

4A Victron multiplus 3000 Charger

4B Renogy Battery to Battery Charger

4S connected to solar  The 4S is slightly diffrent as it has an optoisolator capable of 400V DC vs just 60Vdc for the 4A and 4B so is best that 4S to control solar (that is why it is called S and not C)

EXT IO5 if you want you can have this set as type 2 assuming you want the EXT IO3 as type 4 and then use the 5S to control the Victron BP100

EXT IO6 should be set as type 5 and this controls a relay/contractor or a trip circuit breaker and can control them directly.

Not sure how the Blue Sea 7713 ML

But if it stays ON as long as it has a battery voltage level signal and turns off when that signal is gone then you need the DEXT version for contractors.

[sailingharry]

EXT IO6 should be set as type 5 and this controls a relay/contractor or a trip circuit breaker and can control them directly.

Not sure how the Blue Sea 7713 ML

But if it stays ON as long as it has a battery voltage level signal and turns off when that signal is gone then you need the DEXT version for contractors.

Dacian,

I don't have a 7713 or a DEXT, so I could well be wrong.  BUT, 

I have an EGIS that is very similar to the 7713.  I have it directly controlled by an IOx on the SBMS0.  Power goes to one side of the IOx, the other side goes to the contactor.  As long as the IOx is closed, and power is fed to the contactor, the contactor is closed and all is good.  When the IOx opens, power is lost and the contactor opens.  It "seems" to operate just like a relay -- power it closes, no power it opens.  But it draws milli (micro?) amps.  The power is only a control signal, and the actual operating power comes from the fat battery cable.

I was under the impression that the "contactor version" was modified to provide greater power to maintain a contactor, like the TE EV contactor -- something not needed for the 7713.

Harry

[Dacian Todea (electrodacus)]

That is how I imagined it will work that is why I suggested the DEXT version for contractors as that will output battery voltage on the TripA and TripB until there is a fault and then there will be no voltage so a contractor or in this case the Blue Sea will open the circuit.

The normal version of DEXT for tripping circuit breakers has no voltage at TripA and TripB until there is a fault and then battery voltage will be present there and that will trip the breaker that will also disconnect the DEXT and everything else isolating the battery.

[Allen Tindall]

I am currently planning to be connected to the DEXT as follows:

EXI03 Set as Type 2 

3A Victron BP 100

EXIO4 Set as Type 1

4A Victron multiplus 3000 Charger

4B Renogy Battery to Battery Charger

4S connected to 3 each DSSR 20's P and N with a switch and a diode in series in the positive leg to each DSSR 20

EXI05 Set as Type 4 and SOC of 30%

5A, 5S Victron Multiplus 3000 Inverter

EXI06 Set as Type 5

(12 + V to 5 A Fuse to 6A to 6A to Red Control Wire (13 ma max) to Blue Sea 7713.  

Is there any need to install resistor(s) to protect any of the optical isolated switches in the DEXT?

[Dacian Todea (electrodacus)]

Allen,

4S (are those diversion DSSR20's and you connect 4S to battery charging trough individual diodes and then 4D to diversion ? )

There is no 5A. Do you mean just 5S controlling the Multiplus ? If yes then that is fine.

I guess you got the contractor version of the DEXT

DEXT is supplied from battery GND to battery negative and Batt+ trough a 18AWG wire protected by a 5A fuse to your battery+

The red control wire you will connect to Trip A or Trip B (your choice) both of those can provide 2A continues and are protected internally by resetable fuses.

Those Trip A and Trip B will (assuming contractor version of DEXT) have battery voltage unless something is wrong and EXT IO6  will make them go to zero.