Weird Prog Dyn 9260 issue

[brulaz]

I managed to pop the (rather expensive) fuse at the pos battery terminal (don't ask :R ).

Which left my solar and 120VAC charger's providing 12V to the trailer. The batteries were out of the circuit on the other side of the blown fuse. Yep, just one 60A fuse for all these circuits.

Before replacing the blown fuse, I noticed the trailer's 12V fan going faster and faster, then dropping back to normal speed. And repeat. So I checked the solar charger (Rogue MPPT); it had disabled itself because of high voltage (over 16.5V?). And noticed the V monitor cycling to something over 16V then falling back.

So I unplugged the PD9260 and the V fluctuations stopped.

And I replaced the fuse to the battery bank, plugged the PD9269 back in, and all is back to normal.

Has this happened to anybody else?

I was under the impression that with "modern" converter/chargers, like the PD9260, you should be able to run them without batteries. No?

Luckily, I don't think any other 12V devices in the trailer have been harmed. I only equalize at 15.9V and when I do, I disconnect the trailer's circuits anyway. Guess they are more robust than I thought.

[brulaz]

DrewE, you are right.

Looked at the Rogue MPPT controller manual again, and the "possible cause" for the "Battery voltage too high" error is that the battery is disconnected during charge.

And the display also indicated that the controller was in "STEP" mode which is "Stepped MPPT mode, triggered by a fast rise in battery voltage on array sweep". Never seen that mode before. Apparently the rise was high enough to trigger the high battery voltage error as well.

Anyway, sounds like the Rogue's MPPT sweep (every 10s?) was responsible for the V fluctuations.

And when I unplugged the PD9260, I removed the Rogue's power source. Which stopped everything.

All's well that end's well, and thanks.

[DrewE]

PD specifically says their converters can work fine without a battery.

I would check as carefully as readily practical that the solar controller is working properly. I know some designs do not take at all well to having the panels connected but the battery disconnected.