The input voltage on the inverter was good as indicated by the green led and measuring the voltage directly. As my load on the inverter is known and only involves the heat pump, mostly staying in the 500-800 watt range, the wiring size and breaker is ok. I got the 3000w inverter upon the advice of a cotek technician who didn't belief that the load could be that low for a heat pump and thought that I overloaded the 1500w inverter.
You are using a WBjr, with a shunt in the negative lead of the battery, IIRC.
There should be a display on the KID, that shows the battey current. Have you watched the battery current shown on the KID, at the moment that the Heat Pump starts?
These Inverter Heat Pumps should have little or no surge, but it might be good to look at the current from the battery.
Your comment, " ... The cotek 3000 gives me an orange fault stating that the start up process is abnormal and does not proceed from there ... "
Am not sure what the start up process is, but, if it is the start up when you switch the inverter DC input breaker to on, it is possible that the inrush current into the inverter's input capacitors might cause the DC voltage into the inverter to sag so much that the inverter gives up, and Faults, or something ...
Do not know exactly. Will try to download the manuals for the Cotek 1500 & 3000, and try to see more about the recommended cable sizes, etc.
Thanks for the reply.
It is not exactly clear when you are getting that Orange LED indication. Is that when the Inverter is powered-on with the On/Off switch on the inverter? Does it always do this?
Have you tried disconnecting all AC loads on the output of the inverter, to see if the Orange LED still lights?
I DO agree that in the Table of wire sizes and Inline Fuses for the 1500 & 3000 W -248 inverter it does read as you stated. The Fuse ratings are really too high to protect the stated cable size ... for the 1500 (#10 AWG and 90 A fuse IIRC), and #6 AWG and 175 A fuse for the 3000 inverter. IMO, the Fuse sizes are too large to protect these cable sizes in a Fault condition. But this is probably not the issue that you seeing, with the Orange LED.
You did mention a 50 Amp breaker, is this breaker in the DC cable connected to the input of the inverter?
The steady Orange LED may indicate that there is something wrong with the inverter, itself.
Has the Orange LED always illuminated when you power-up the inverter?
Thanks, Good Luck, Vic