"By failing to prepare you are preparing to fail."-- Ben Franklin
Is the inverter just to run the well pump and a few lights? If I remember correctly your house is already mostly solar powered and you are running a low surge pump.Asking because a Conext 6848 is a huge inverter for just a well pump.second thought... My 6848 flashes "low DC voltage" when the well pump kicks on after the sun goes down. Any suggestions as to why? I've got good cables and a 893 amp/hr 48v battery bank with strong batteries but am beginning to wonder if the 3 year old 1.5hp pump has problems.
Wire size between battery and inverter is a minimum of 2/0 for under 5 ft else you should use 4/0 fine wire MTW although I usually use parallel 2/0 as I run parallel batteries. Those submersible well pump draw huge startup currents. If you ever have to get a new pump use the Grunfos with the built in electronics. No control box. When the pressure switch closes you can count to about 9 before the pump starts up. I think it charges up a starting capacitor first. Another thought. If you use liquid lead acid batteries then you have terminal corrosion due to the fumes. This also will cause that problem. I did not think of it earlier because I use AGM batteries, no fumes & no corrosion problems.
Quote from: RWS on June 18, 2019, 07:01:41 AMWire size between battery and inverter is a minimum of 2/0 for under 5 ft else you should use 4/0 fine wire MTW although I usually use parallel 2/0 as I run parallel batteries. Those submersible well pump draw huge startup currents. If you ever have to get a new pump use the Grunfos with the built in electronics. No control box. When the pressure switch closes you can count to about 9 before the pump starts up. I think it charges up a starting capacitor first. Another thought. If you use liquid lead acid batteries then you have terminal corrosion due to the fumes. This also will cause that problem. I did not think of it earlier because I use AGM batteries, no fumes & no corrosion problems.I will have this one up and running in a couple days and see if I have any issues. I'm using 4/0 ga fine wire with spotless terminals on 1 year old Rolls 5000 series FLA batteries. Cable lugs were tightened using a torque wrench to factory specs.I've spoken to both Rolls and Conext tech departments. The guys at Schneider said to reduce my LBCO but I've already got it down to about 25% SOC voltage with a 300 second delay. My POS battery cable is a little long at 9': I guess that may be the problem but the wire is only 4 years old with no signs of corosion.