Hello Drake, Since the relay board is functioning some times, I would more suspect (1) an intermittent controller board or (2) corrosion on the contact area of the header connection. They are relatively easy to change and not too expensive.
One thing I would test first is to unplug the ARC remote the apply AC power. The ARC has the ability to control when incoming AC is used. Unplugging it will bypass all remote function as a cause, though I highly doubt it is. Larry Crutcher Starlight Solar Power Systems On Jan 18, 2023, at 7:42 PM, Drake Chamberlin via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: Hello Wrenches, A Magnum 4024 won't charge batteries or transfer loads. The owner of the system, now well out of warranty, has spent hours on the phone with tech support and even took the unit into a Magnum authorized repair shop. The technician declared that it was working perfectly. On connection to the utility grid, the ME-ARC shows no sign of seeing the power. Once in a great while, it will connect and start charging batteries. Then it will quit. This seems to me like a matter of a relay not operating. The technician, who checked it out, believes that the problem is with the AC coming in. One tech support agent thought the same. The inverter is 1000' plus from the transformer. The incoming voltage, with light loads, is 248 VAC. Shouldn't the ME-ARC at least show that it sees the grid, even if the voltage dropped upon connection to the point it couldn't hold it? Isn't the Magnum charger pretty forgiving about voltage input? I've heard they can have issues with inverter-generators, but this is 60 Hz grid power. Thank you, Drake Drake Chamberlin Athens Electric LLC Ohio Electrical Contractor’s License 44810 CO Master Electrician’s License 4526 NABCEP Certified PV Installation Professional -- _______________________________________________
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