Solar generates at midday. Commercial tariffs peak in the evening. Without storage a site exports its cheapest energy and buys back its most expensive - and storage is simply the mechanism for closing that gap.
Because solar generates when the sun is up, which rarely matches when a commercial site is paying most for power. Storage moves that energy into the expensive hours.
Simpler, but usually worth less. Export rates are generally well below the tariff a site pays to import, so self-consumption is the more valuable route.
Yes. Demand charges are set by short peaks, and discharging across those peaks is one of the more reliable ways to reduce them.
Tell us the site, the load and the constraint you are working against, and we will tell you what is realistic.
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