Posted March 10, 20232 yr Hi all I have a combiner box with one string the string in connected to 4 x 450watts solar panel.series and parallel as shown below I am getting power coming out of the solar panel enough to run the system The combiner box has a 12amp fuse When I put my multimeter below the fuse I get a reading of 91 volts when I test above the fuse I get 0.29 volts Can someone help me on how to calculate what fuse size I need as I feel the fuses are blowing but again I am not to sure on how to test them
March 10, 20232 yr Take out the fuse from holder. Put tester on continuity/Ohm setting. Put 1 lead at top of fuse and one lead at bottom. It should read close to 0Ohm. According to you drawing you could produce 10A. I would fit an 15 Amp fuse.
March 10, 20232 yr Author I am now getting power from the solar panels to the inverter and the batteries are now charging but the inverter is not should the 230 output I have 0 volts going to the main fuse box. My system is 100% off grind
March 10, 20232 yr Check if inverter is not in Standby mode or the battery voltage is still to low to switch on inverter.
March 10, 20232 yr Author The system has 3 x US2000 lithium batteries The inverter has warning mode 04 which meqns low battery I will waiting until I have 3 green light on the batteries to see if that is the problem at the moment it is on 2green lights but one is flashing so it is charging
March 10, 20232 yr Check your battery shutdown voltage on inverter. I assume you don't have communication between batteries and inverter and is using user settings?
March 10, 20232 yr Author I have communication with the inverter and battery as I can see it on the inverter
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