Inverter Pre-charge circuit using off-1-2-both isolation switch

[EnsignR]

Hi everyone,

Posting here to get thoughts on an idea I had for using a off-1-2-both isolation switch 2-way isolation switch (like this one on Amazon) for a pre charge circuit on a 12V 1500W inverter. It'd basically be operating the switch in reverse to normal, but it's just a mechanical switch so I don't see a problem.

A picture tells 1000 words so here's an image below, but the idea would be from off position turn to #1 to allow the capacitors in the inverter to charge, then turn to both followed by #2 for normal operation and to off again when you want to switch it off. Basically you only every turn it clockwise; it'd be great to have a way to enforce that.

Any thoughts or comments would be appreciated. Thanks.

 

[Shimmy]

Yes, that is a pretty common solution.

 

[EnsignR]

Yes, that is a pretty common solution.

Great. Thanks. Now I just need to work how to select the correct resistor.

 

[Captain Kirk]

Great. Thanks. Now I just need to work how to select the correct resistor.

Inverter Disconnect Switch with Precharge

To get the paper, click on the orange button at the top of this page. This circuit is designed as a disconnect switch that allows the user to pre-charge the inverter capacitors before turning the switch completely on. 26 June 2020 update: At...

diysolarforum.com

 

[justinm001]

There are other options. I think having a jump pack makes the most sense, just connect it, turn it on then turn on the batteries and turn it off. You then have a backup battery incase any issue or you need to jump anything.