Jun 02, 5:48 PM Electrodacus wrote:

I recommended to a few SBMS backers to use this type of SSR (Solid State Relay) for remote ON/OFF of the inverter as described in page 12 of the SBMS manual.
In the manual I recommended a small isolator but that requires some soldering on a bread board of that usually 4 pin dip optoisolator and one current limiting resistor.
While using a DC SSR is for sure an overkill even if is just a 25A one not this 60A I got to evaluate is still an inexpensive and simple to use option.
The 25A called SSR-25 DD is just 5.5CAD probably around 4USD delivered like this example  http://www.ebay.ca/itm/301896250399
I got my 60A from a different seller and one of the two was defective but was not a problem for me since I got one to open anyway and I knew it will be completely damaged in order to get it open.

I was expecting two back to back mosfets and I was surprised to find two parallel IGBT rated at 600V even if the unit is rated at 60V DC max.
The IGBT is a combination between a bipolar transistor and an mosfet. It has a Collector and Emitter but instead of Base it has a Gate as the mosfet so is a voltage driven device not current driven as the bipolar.
The 25A will probably have just one of this IGBT and all the rest will be the same.

The SSR (the working one) will easily work with 3.3V from one of the IO pins from SBMS with no limiting resistor required and only draws about 3mA.
The output is more than capable to switch the remote on off signal that is usually some low DC voltage with just a few mA (my inverters draws 12 or 13mA when remote pin is pulled to GND to start the inverter).
Is not that great as a SSR since the 60A version I have will have on the output a switch resistance of around 30mohm and this means that at 60A it will drop 60A x 0.03ohm = 1.8V x 60A = 108W so it will need a realy serious heatsink and most probably a fan.
But driving something like a 5 or 10A DC load should work just fine with a 3W needed to be dissipated at 10A maybe not even needing a heatsink (it will get a bit hot at 3W).

I think you can see in one of the photos the IGBT used is G40N60B3
As a conclusion you can use this as a simple isolator replacement for inverter remote start with the SBMS. Get the cheaper 25A version. I only got the 60A to see how is build and what sort of characteristics it has.
With a proper heatsink able to dissipate 27W the 60A version can probably be used for up to 30A in some other a applications.

Hope someone found this post interesting and I saved you opening one of them :)

2016-06-02
6 Photos 

Source: https://plus.google.com/+electrodacus/posts/LYyoyG2KwWK