EXTIO5 & 6

[J.W van de Poll]

Hi All

I have EXTIO3 dedicated to the Inverter and EXTIO4 to DEXT16 for Solar panels.

However I have a 100A SSR for minor DC loads in the caravan.

I guess as long as I don't reach anywhere near 50mA I could parallel the SSR to EXTIO3.

A cleaner solution would be to use IO5 or 6 if they are available.

What is the preferred solution in this instance.?

Regards

[Dacian Todea]

It depends on your inverter and it that is happy to be in parallel with the SSR.

EXT IOx (all of them) are the same and they are the output of an optoisolator Toshiba TLP172GM in case of the latest SBMS0 version and so the output is just a close or open circuit nothing else.

The inverter depending on model may just have 5V or battery voltage level on those two wires and when wires are connected together the inverter will power ON.  The SSR most likely will require some 3V to 30V input voltage in order to turn ON thus may just not work (most likely not work) paralleled with the inverter on EXT IO3.

So yes for simplicity you may better just use EXT IO5 connecting the EXT IO5+ to battery+ trough a 1KOhm resistor and then the EXT IO5- connected to your SSR positive input contention while the negative of the SSR input will be connected to battery negative.

[J.W van de Poll]

Hi All

Can I do the same with EXTIO3 if the Inverter takes more than 50 mA.

ie:

Use a smaller SSR in between the IO3 and the Inverter Remote.

Regards

[Dacian Todea]

No inverter will use more than 10 or 20mA max unless is one of the cheaper one that has the fan or some LED, LCD's directly powered trough that switch.

But yes you can use another SSR or optoisolator between the EXT IO3 and inverter or any other device that you want to control.  There are people that use some optoisolator board with 4 separate optoisolator to control multiple devices from EXT IO3 or IO4.
EXT IOx is nothing more than an open or close circuit signal that you can use the way you want. Open circuit means devices should be OFF and close circuit devices should be ON.

[J.W van de Poll]

Hi All

I just realised after looking at the diagram at the end of the manual, that none of the TLP172's have a source voltage connected.

So, if I connect EXTIO4 to the DEXT16, is the DEXT16 supplying the source voltage ? and you are just pulling it to battery negative.

Then in the case of EXTIO3 I will have to do the same.

I have been so used to looking at your "simplified" diagrams that I missed that.

I assume when all my bits arrive they would include detailed connection instructions ?

Regards

[Dacian Todea]

You probably mean the DSSR20 but if you refer to DEXT16 then that is supplied from battery and yes it has his own voltage source.  The DSSR20 also has one it creates that from the PV panel voltage.

The inverter remote ON/OFF is just the same thing as the ON/OFF switch so all it needs is a close circuit there is already usually battery voltage level and when circuit is closed is usually 2 to 10mA of current flowing.

 There are user manuals for all devices for SBMS0 but also a separate manual for DEXT16 and DSSR20 see on my webpage if you missed that.