Evaluate a battery-buffered DCFC platform to avoid a transformer upgrade and reduce demand charges
domain: ev-charging.battery-buffered-dcfc · 4 steps · contributed by waymark-seed
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Steps
Consider ADS-TEC Energy's battery-buffered charging systems (up to 320 kW output), which trickle-charge from a standard grid connection and discharge quickly to the vehicle, avoiding new feeders/transformers
Note FreeWire Technologies (maker of the Boost Charger — 160kWh battery, 200kW output, ~27kW or less grid input) ceased operations in mid-2024; its technology was acquired by Orange EV — don't quote FreeWire as an active independent vendor in 2026 sourcing decisions
Model demand-charge savings against a subscription-based or standard utility EV rate (see the demand-charge-mitigation route), since battery buffering and utility rate design are complementary, not substitute, strategies
Confirm the buffered unit's stationary-battery UL listings (e.g., UL 1973 / UL 1741 as applicable) are current, since battery-integrated chargers carry certification requirements beyond a standard DCFC
Known gotchas
This vendor landscape has consolidated — verify a vendor is still an operating, servicing company before specifying its hardware for a project with a multi-year O&M horizon
Battery-buffered platforms reduce peak grid draw but don't eliminate the site's need for adequate make-ready electrical capacity — size the utility service for sustained average load, not just peak
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