2 Classics | Solar + Hydro | PWM Diversion on Hydro Triggering Arc Fault

[MystHunter]

Have two classics networked in FollowMe, both on same latest firmware. The hydro controller is a Midnite 250, and the Solar is a 150.

Classic 250 (hydro) is doing PWM diversion (on PV High via Aux 2) to a 30Amp 12v water heating element via 100Amp Crydom SSR. This diversion SSR is connected via the battery bank 1000Amp buss bar. Battery bank voltage is nominal 12v. When hydro turbine starts to free spool (voltage goes up), diversion begins.

When turned to "manual on" and manually activating the diversion, no arc fault is tripped. Only when a PWM diversion method is selected, does the arc fault trip. I've adjusted the arc time and sensitivity to no avail.

Oddly, the arc fault is only detected by the Classic 150 (doing solar), the Classic 250 (hydro) and actually doing the PWM diversion detects no arc fault.

Any suggestions here? Just disable arc fault on the Classic 150? I've checked everything and it does not appear any visible arching is occurring anywhere in dump load, and as mentioned when using non PWM diversion method no arc fault is detected.

[FNG]

it sounds like the 150 is more sensitive. Do you have the serial numbers of each?

[FNG]

just post them like CL0035xx or CL035xxx

[MystHunter]

Classic 150 - CL22XXX
Classic 250 - CL52XXX

Both are online at mymidnite2.com

[ClassicCrazy]

You should edit your post and put XXX for the last three digits .

Larry

[FNG]

The 150 has an older version of arc fault and was more prone to false trips, I suspect thats what you are seeing.

[MystHunter]

Been troubleshooting this for a while now, switching out breakers, adjusting AUX settings, etc...

Sounds like one of the only workable solutions is to disable Arc Fault on the Classic that complains or otherwise don't use any PWM diversion method on the Midnite.

Better ideas/suggestions (other than buying a new controller)?

[FNG]

You could reach out to me I can help you with this ryan@midnitesolar.com

[boB]

Are there any wires being shared between the solar and hydro ?  Maybe the negative ?

Probably not but had to ask...

boB

[MystHunter]

Will reach out FNG, thanks. Let me know what exactly you need if you would please.

And solar and hydro are only connected insofar that both of their respective charge controllers are connected (via double pole DC breakers) to their respective 1000 amp Bus Bars (BlueSea 1992's) via 4 awg copper. Bus Bars connect to their respective battery positive and negatives via 4|0 awg copper. The Bus Bar Negative to the Battery Negative has a BlueSea 9003e switch in-between.

[boB]

Will reach out FNG, thanks. Let me know what exactly you need if you would please.

And solar and hydro are only connected insofar that both of their respective charge controllers are connected (via double pole DC breakers) to their respective 1000 amp Bus Bars (BlueSea 1992's) via 4 awg copper. Bus Bars connect to their respective battery positive and negatives via 4|0 awg copper. The Bus Bar Negative to the Battery Negative has a BlueSea 9003e switch in-between.

OK.  That battery side sharing should be fine.