Solar System Math Expert Needed

I'm developing solar software and need a math expert to ensure accurate calculations. I need assistance with export and battery self-consumption estimates without live data. We have production, usage, and battery size data available.

Requirements:
- Historical usage data
- Estimated production data
- Battery capacity data

You should be able to work with a combination of:
- Export calculations
- Battery self-consumption estimates

Ideal Skills:
- Expertise in solar energy systems
- Strong mathematical and analytical skills
- Experience with battery systems (not limited to lithium-ion, lead-acid, or flow)

Please provide a solution to ensure our calculations are as accurate as possible.