I appreciate all the information on this thread; special thanks to marcmerlin. Hopefully my experience could be helpful to some. I built the exact circuit marcmerlin described in his blog, but it didn't work for my specific inverter (see below for components). It occurred to me that the basic concept of this type of inrush limiter circuit is probably very specific to the type of inverter. My inverter has an electronic switch and a remote and would never achieve an appropriate voltage to trip the 12v relay. So, I created a new type of inrush limiter circuit that works with my inverter and should work with every inverter.
The basic concept is a larger relay that delivers approximately 4-5 amps (voltage variance) to the inverter during a time delay period. After the delay, 10 seconds in my setup, the timer relay closes the main 12v relay. The timer relay automatically starts when it detects voltage; so when the DCDC converter turns on.
Here is the basic info:
Components:
GIANDEL 2200W Pure Sine Wave Power Inverter -
https://amzn.to/37z5FG2
UCTRONICS DC 12V Time Delay Relay -
https://amzn.to/36C9Amf
Cutequeen 2PCS 100W Watt 3 Ohm Resistor -
https://amzn.to/39BDLMk
ZOOKOTO 150 Amp Circuit Breaker -
https://amzn.to/37wreqS
Notes:
- I wouldn't recommend the circuit breaker. It trips at around 60A under load.
- I used 14 gauge AWG wire
Let me know if any other info would be helpful.