Thank you Peter, I will review these options with my client, along with seeing if they have interest in entertaining paying you for the development work.Thanks for making these inquiries, Dave. I guess there just aren't any inverters out there that will work.
I'm not quite ready to let everybody's panels go to a scrap heap yet. I have a few ideas, they're all going to take some effort for me implement but maybe I can get that back in selling what I come up with.
At this point I'm not sure which path to go down. Let me know if you have any thoughts.
- Reverse-engineer the TenK control circuit, and develop my own firmware that emulates a solar panel. I made some progress reverse-engineering the programming tool a couple years ago, but without access to the source code, new firmware has to be done from scratch. There's a chance this won't work; if the output doesn't act fast enough due to hardware limitations the inverter still won't be able to optimize, but if it does work we won't need any extra hardware and you can use any inverter.
- Build an adapter circuit, something that bolts on to the TenK modules and makes their output work with microinverters. This wouldn't be particularly difficult and allows people to use their existing hardware, but it adds the cost of a third piece of hardware that would need to be added to each module.
- Design a new microinverter that works with TenK modules. Probably the hardest option; I don't doubt I could get something to work but getting the safety and reliabilty up to standards may be beyond my resources. The benefit is that this could be a drop-in replacement for failed TenK-compatible inverters which would be easy for existing array owners.
- Adapt an existing inverter. In particular, something with programmable/output limiting like a GTIL could probably be made to work, perhaps with a small added control circuit. Inverter choice would be limited but at least there would be one option, and I think this would be easy relative to the other options.