Is there a way to get the Rosie to Charge at 60 amps using my Diesel Onan 7500w?

Started by bigbillsd, October 11, 2026, 11:20:17 AM

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Wizbandit

Did you try setting topology to 120/120 and see what it does? I have never tried that without at least paralleling AC ins. It probably won't work but try it. It probably needs a new section in firmware to allow it but wouldn't expect to see any firmware work this year or even early next year.

Now two little Rosies working independently would work fine, they can't be stacked so they don't care about phase.

bigbillsd

Quote from: Wizbandit on October 15, 2026, 05:21:24 PMDid you try setting topology to 120/120 and see what it does? I have never tried that without at least paralleling AC ins. It probably won't work but try it. It probably needs a new section in firmware to allow it but wouldn't expect to see any firmware work this year or even early next year. Now two little Rosies working independently would work fine, they can't be stacked so they don't care about phase. 

Yeah, Ryan had me try that.  It didn't make any change at all so after a few charges I moved it back to 120/240.  -Bill

Brucey

Quote from: Wizbandit on October 15, 2026, 05:21:24 PMDid you try setting topology to 120/120 and see what it does? I have never tried that without at least paralleling AC ins. It probably won't work but try it. It probably needs a new section in firmware to allow it but wouldn't expect to see any firmware work this year or even early next year.

Now two little Rosies working independently would work fine, they can't be stacked so they don't care about phase.
My understanding of the issue is that the Rosie firmware assumes 120/240V operation, and therefore it halves the max breaker size value, even when set to 120/120V mode.

bigbillsd

Quote from: Brucey on October 16, 2026, 11:42:17 AMMy understanding of the issue is that the Rosie firmware assumes 120/240V operation, and therefore it halves the max breaker size value, even when set to 120/120V mode. 

I will keep my fingers crossed that they can change that assumption with a firmware fix. 

Should I call them to officially request this fix?  That one fix would make the Big Rosie a real world device for the majority of the diesel pusher world! The only other thing that is odd is the grid support but maybe other folks would think that is normal as I don't have any experience with other implementations of grid support.