I don’t remember hearing you can’t upgrade. You could ask zonna what the board part numbers are between the 4 and the 8. 
I know you can turn an 8 into a 4. 

But the power modules would need to be same rev. 

And if it’s a 4048 not an A, I think it’s about impossible to find anything to work on the non A variants 

Good luck

Jay




On Nov 3, 2025, at 7:39 PM, Kirk Herander via RE-wrenches <[email protected]> wrote:


Dana,
Interesting. The procedure as I recall to input the installer menu code is in the last quick start guide they published, along with the generic password itself. it's needed to turn on AC coupling, maybe also for your upgrade.

And I was told 3 years ago by OB that you can't just add a 4kw inverter module to ramp up a 4k to an 8k. As a result I upgraded my customer from a 4048 to an 8048. I still have the 4048 you can pull the module out of. I'll sell the whole inverter cheap.

On Mon, Nov 3, 2025 at 2:25 PM Dana Orzel via RE-wrenches <[email protected]> wrote:
There is a procedure along with a tech code which I have, to get into the installer menu in a radian. Does anybody know the steps to get into the installer menu?
Thank you in advance as always
Dana Orzel
C: 208.721.7003
E- [email protected]
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