Is ¥2.65M a good deal for a 6.37kW Solar + 9.9kWh Battery system? (Canadian Solar / Aichi)

Hey everyone,

We just bought a 建売 house in Aichi (Chubu Electric area) and getting quotes for solar. I just received a quote that includes a storage battery and HEMS, and I wanted to get a sanity check from the community.

The vendor used the classic "massive discount" tactic to halve the sticker price, so I'm focusing on the final contract price. Does this look standard for a solar + battery combo, or should I be shopping around?

The Specs:

• Solar System: 6.37 kW (Canadian Solar, 14 panels: CS6.2-48TM-455)
• Battery Unit: 9.9 kWh (Model: ES-DYL)
• Inverter: Tribrid Inverter (ES-T5 5.9kw)
• Extras: HEMS + Auto Switch Box included
• Roof Type: Slate

The Cost:

• Base Price: ¥6,525,706 (tax incl)
• "Discount": -¥3,523,369
• Final Contract Price: ¥2,650,000 (tax incl)

Financing offered:

• 2.60% interest rate (15 years = ¥17,792/mo or 10 years = ¥25,109/mo)
• The quote currently lists ¥0 for subsidies.

I'm pretty conviced with the output of our rather complicated 寄棟 roof, but Is ¥2.65M a reasonable final price for a ~6.4kW solar and ~10kWh battery combo in today's market?

Any insights or advice would be hugely appreciated! Thanks!