| If dc voltage is elevated magnum inverters won’t charge. Force Bulk under the Cntrl menu will test if this is the issue. Rebulk voltage can be adjusted only in you use “silent” final charge rather than “Multi” as final charge state. If using lithium batteries, cc/cv instead of custom battery settings may also be of benefit. Rich Sent from my iPhone On Oct 31, 2023, at 12:11 PM, Starlight via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
Sorry Dan, I meant Ron.
Dan,
Since you are using 120Vac for the source, did you connect to just 1 AC input; AC1 or AC2? You can not parallel same phase to both inputs or damage may occur.
Have you measured the generator frequency and voltage at the inverter input? Make sure to reduce the charge rate to 50% or less when supplying 120V only.
Larry Crutcher Starlight Power Systems
I have had issues before with Magnum inverter/chargers not accepting AC input from certain generators. In one case, it would not charge from a Honda 3kw cube, but worked fine with camp’s Honda 2kw. Magnum said it was a Honda problem, Honda said it was a Magnum problem. We ended up just rearranging generators and inverters between camps. Weird, we never detected anything odd in voltage or frequency from any of the generators.
Dan Fink Owner, Buckville Energy Consulting LLC IREC Certified Instructor for PV and Small Wind Installation NABCEP Certified PV System Inspector NABCEP PV Associate danbo...@gmail.com970-672-4342
Hello Wrenches,
I am completely stumped. I built a Magnum 4448 panel for a client and it was installed by an electrician. It was thoroughly tested before going out the door on all functions and pre-programmed for the off-grid site. Electrician just had to hang it on the wall and make 4 connections, AC IN, AC OUT, BATTERY, PV. Somehow the system wouldn’t go into charge mode. The site is a 3 hour trip each way. The electrician was baffled, he had experience installing solar but very limited so I went to the site to see what the problem was. After spending a day checking out the inverter with two different generators, checking all the connections, AC at the inputs at the inverter and at the outputs on the breakers, and even removed the cover from the inverter to make sure some connections had not shaken loose inside the box on the long bumpy road into the property. Everything checked out. So assuming the AC board in the inverter was faulty I ordered a new unit to replace and that has now been done. SAME PROBLEM! I’m wondering now if it’s possible that the Magnum remote monitor could be the problem. It functions properly on every setting but is it possible there is an internal fault? Could it prevent the automatic charge cycle from initiating? Seems unlikely to me because the inverter can go into charge mode even without the monitor. I also tried replacing the connection cable between the monitor and inverter but no luck.
The generators are both small, one a Honda 2kW and the other a Champion 3.8kW. Neither is ideal but I have had no issues with these types of generators in the past and the client has ordered a larger 10kW unit but we don’t have it yet to test. Generators have been run with Eco Mode off. Output to the house on bypass is consistent and without problem.
Any suggestions - this is just confounding.
Ron
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