I would not order from a flyer like that.
A few points to look out for:
- no mention of how much storage (kw) your battery will have
- no info to the exact battery type, so you can't compare
- they're trying to put pressure on you with the relatively short time span. 14th September.
- FYI just having an energy storage doesn't necessarily mean it will work in the event of a power outage
I would either ask them for the full details or contact another company and ask for an offer.
Source and more statistics: https://cleantechnica.com/2023/10/04/norways-evs-at-a-record-93-share/