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I ordered the Victron $64, 75V, 15A SCC. We'll see if it solves this spiking problem.

Yes, I also have higher voltage, lower current, since my 3 solar panels are in series. I don't have to worry about cable voltage ratings unless my voltage spikes exceed 600V (nominal 60V).

Thanks Thanks, I cancelled the order. Might be cheaper to buy 2 inductors and 2 capacitors to make a Butterworth filter. The 50A victron is $182.

They're a bunch of crooks that just pirated MPPsolar that do no quality control and have no manuals or customer service?

Thanks. I just saw their 30A version. Might get it. Or might buy 2 inductors and 2 capacitors to make a filter

They were definitely charging with the epever, just having the spike problem. So why not fix that with a Butterworth filter?

I have 3 modules, each with 8V nominal voltage (so 4 batteries in each module, 2 in series, 2 in parallel, that's how they are assembled), for a 24V system. Supposedly with 4.15 max voltage per cell, this would give 4.15x6=24.9V max. I got them relatively cheap from used cars. I can't change the...

One other thing: I have not been connecting any load to the charge controller. The inverter is connected directtly to the batteries. Should I connect it instead to the load terminals of the charge controller?

The problem is that it can't filter out that spike. The nominal open voltage of the 3 panels in series is 63, much less than the 138 spec on the epever, and also less than the 100V spec on the victrons. So the only question is does the victron filter out the spike or not?

Was thinking on the output, across batteries and inverter, not input.

Janis No, each panel is 200W, total 600W. But why won't the 75/15SCC work then? I rarely have more than 7A total, 63V (that's about 21V open circuit per panel) from those panels, unless the spiking gets it over, but hopefully, if it's well designed, it should be able to handle it

Was thinking about filtering output, not input of controller. I have not priced out inductors, could they possibly be more than $182 for the 50A victron?

Thanks. I'm looking into Victrons

I don't see why. Epever says it should not hurt it, I asked. If I was guaranteed that the victron could fix the initial problem (lack of filtering, NOT spiking, which as you point out is what IS, not THE PROBLEM), I would get it.

Might try just the capacitor, but it probably won't filter this low frequency spike (1/(2 Pi RC) is probably too large a frequency since R is so small). I AM worried about the DC resistance of any inductor. Will have to check.

OK, will do. Thanks for everyone's help. You guys rock

Thanks for that. If I'm not charging more than 50 Amps (from solar panels) into the batteries (I could set it to less), and also not discharging more than 120Amps, do you still think I need a BMS? Maybe I should put the batteries somewhere outside the house, to prevent burning it down? I doubt...

Thanks folks for your help. So I have 1 epever Trace 60A max (I forget which one, I had that info when I joined the forum, but I guess it doesn't show publicly?) SCC that has the maximum charge parameter set to 14.6V, the boost voltage set to 14.5. I have to manually change the equalization...

Thanks for your opinion. I'm going to monitor them closely for temperature and do some extreme load discharge testing. So far so good.

I wonder if I need a low pass filter to filter out these annoying transients that trigger my inverter overvoltage protection alarm and shutoff when the voltage from the controller exceeds 15V. It only happens for a few milliseconds when a burst of sunshine from parting clouds hits my panels...

update: I checked the video and neither input voltage nor input power exceeds the Tracer specs (a large safe margin), at least according to their MT50 measuring and display device. It's possible though that this device filters out quick spikes.

OK, I am guessing this is the problem. Epever has been good about responding to my emails, though the engineer (or maybe just a customer rep) was always vague in answering precise questions, something I attributed to the nature of the Chinese language, but maybe also because it gives him...