The hidden cost of getting solar plus BESS wrong

As hybrid PV + BESS projects move towards standard practice, the old reliable performance frameworks that operators inherited from standalone solar PV are quietly breaking down.

As the solar industry becomes increasingly integrated with battery storage, operators are discovering that batteries behave nothing like panels under sunshine.

A clipped PV string loses yield passively and silently. A poorly managed BESS rack can take an entire system offline. Similar large-scale battery assets can operate across vastly different dispatch modes and degradation curves, making it easy for losses to accumulate without the right expertise to catch them. What might be rational O&M decisions in solar, where small losses are ignored, can be significant in BESS. By the time an optimizer notices, it may be far too late for fixes to be fast, easy, and not hurting revenues needed to pay investors.

Getting hybrid performance right means understanding where solar logic ends and storage logic begins — from how you design DC overbuild ratios, to how you lock BESS capacity for high-value events, to how you assign warranty liability when the two assets share a DC bus.

Join us for this pv magazine Webinar with our webinar partner Twaice to be part of a live discussion with experts breaking down the technical and commercial realities of managing PV and BESS performance side by side, and what operators consistently get wrong and why.

Chris Pickett, Senior Solutions Engineer at Twaice, and Jonas Soellner, Technical Solution Engineer at Twaice, will detail aspects of DC overbuild strategy on the PV side and BESS capacity and cycle management, monitoring gaps between the two asset classes, and more.

pv magazine Webinar content:

• How and why performance logic for solar PV vs solar + BESS is fundamentally different, and what that means for revenue modeling.
• Why ignoring data is often the right call in PV, and why the same approach in BESS is the wrong call.
• Commercial and warranty complexity in DC-coupled hybrids and risk.
• Details of clipping, cycling, failure modes, and what each asset actually costs to use.
• What operators get wrong.
• Q&A

We encourage you to join live to take part in the discussion and ask questions during our dedicated time for Q&A. Questions can be submitted beforehand or through a chat window during the webinar.

This webinar will be moderated by Tristan Rayner, Editor at pv magazine ESS News.

Registration for this pv magazine Webinar is free of charge.