Personally, with five air conditioners I would go considerably bigger. Probably around 18 panels, roughly 11 kW of solar, a 10 kW inverter and at least 16 kWh of battery. From there the sky is the limit, depending on how much independence from the grid you actually want. I would also look closely at everything around the system, not only panels, inverter and battery. Proper breakers and safety breakers, surge protection, battery protection, correct cable sizes, and an overhaul of the existing electrical system in the house if needed. The quote already includes quite a lot of this, including the distribution box, leakage and short circuit protection, battery breaker equipment, surge protection and grounding, which is good. It is strange, once you first get a solar system you always seem to wish you had more. I oversized pretty much everything myself from the start, except the battery capacity, which I added to later on. I cannot really comment on the price itself, because that depends a lot on the company doing the installation, factory guarantees, the quality of the components, and what the installer promises in terms of aftersales service.
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