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Battery & energy storage
Residential, commercial and utility-scale storage systems, sized and specified by chemistry, application and duty cycle.
Talk to our teamBatteries & Storage
Residential, C&I and utility-scale storage.
Designed for your business
Installers · C&I developers · Utility EPCs
Reduce customer demand charges
De-risk grid resilience claims
Chemistry, sizing and coupling choices
LFP as the default chemistry
Lithium iron phosphate has displaced older NMC chemistries across nearly every new residential, commercial and utility storage listing, largely on thermal stability and cycle life. The guide covers where NMC or alternative chemistries still make sense against LFP's lower energy density.
Sized by application, not just capacity
A residential backup system, a commercial demand-charge system and a utility-scale peaker run against completely different duty cycles even at the same kWh rating. This guide separates sizing logic by segment so a spec doesn't get borrowed from the wrong use case.
AC-coupled versus DC-coupled architecture
Retrofitting storage onto an existing PV system usually means AC coupling, while new-build systems can go either way with different efficiency and cost trade-offs. The guide flags which listed systems support which architecture before it affects the inverter spec.
Spec storage without commissioning surprises
Match chemistry to duty cycle
Cycle life and thermal performance data are visible before a battery gets specified into a high-cycle commercial application it wasn't built for.
Avoid coupling surprises
AC and DC coupling compatibility gets confirmed against the inverter spec during procurement, not discovered during commissioning.
Price by kWh, not by brand name
Landed cost per kWh is comparable across verified suppliers, so a premium brand has to earn its premium on the invoice.
Storage sizing depends on inverter
Storage sizing depends on the inverter
Hybrid inverter selection determines whether a battery needs its own charge controller or can run through the existing inverter. Check the inverter guide before finalizing a storage bill of materials.
FAQs
Why is LFP the default battery chemistry now?
Lithium iron phosphate has become the default because it offers strong thermal stability, a long cycle life, and no cobalt, which lowers both fire risk and cost per cycle. Those traits suit the daily charge and discharge pattern of most solar storage. Sunhub prices storage by usable kWh and chemistry rather than by brand, so LFP's cost advantage is easy to compare.
What's the difference between AC-coupled and DC-coupled storage?
In a DC-coupled system the battery ties into the solar array on the DC side through a shared or hybrid inverter, which is efficient and well suited to new installations. AC-coupled systems have their own battery inverter and connect on the AC side, which makes them a common choice for retrofitting storage onto an existing PV system. The right pick depends on whether you are building new or adding to an installed array.
How is battery storage sized for commercial versus residential use?
Residential storage is usually sized around backing up essential loads and shifting a home's evening usage, often a few kWh to a couple dozen. Commercial systems are sized against the load profile and the goal, whether that is demand-charge reduction, time-of-use arbitrage, or backup, so power in kW matters as much as energy in kWh. In both cases the inverter's ratings cap what the battery can deliver, so sizing starts from application and duty cycle rather than capacity alone.
