Adding remote start to powerjack 8000wLF 24V circa 2018

[phillip matolcsy]

Hi,

I am attempting to shut down my inverter when batteries are getting low(50% charge). The powerjack shuts down much too low(20V?). I bought a battery protect bp-220 thinking i could do this, but have since found that it can't handle the current of charging the capacitors. It will also not handle reverse current when using AC charging function.

 My question relates to the on/off switch on the powerjack. What kind of voltage and current go through the switch when it it is turned on? Is it battery voltage? How many amps is the switch rated for?

I was thinking I could use the battery protect to switch the inverter on and off instead of sending all the current through the battery protect

 

thanks

phil

[Sid Genetry Solar]

1 hour ago, phillip matolcsy said:

My question relates to the on/off switch on the powerjack. What kind of voltage and current go through the switch when it it is turned on? Is it battery voltage? How many amps is the switch rated for?

The power switch on the PJ inverter basically provides DC battery voltage (positive input terminal) to the main power supply chip.  It is very low current (should be <0.1A), and as such should be easy to control with a small signal relay or otherwise.  (To be technical, there's a Schottky rectifier diode between the positive terminal and the power switch.)

Just be careful those wires don't touch anything else...battery power touching anything inadvertently usually doesn't end too well.

[orangezero]

If you or others don't have an answer to adjusting when the inverter shuts off yet, the Electrodacus sbms0 should be able to do what you need for a decent price.  It's main job is as a bms, but it integrates quite a few other customized functions. It can also do temperature shutoff.  Don't want to sound like an advertisement, but I read these threads and see one just one of these functions costs to do on its own, and his design keeps seeming more and more comprehensive.

I believe the sbms0 works by utilizing a small internal relay which uses a CAT5 wire (typically) to the correct type of on/off switch on the inverter.  Will Prowse has a youtube video of setting up the smbs0 where you install an relay switch to another type of inverter.