The offline reference and toolkit for the people who keep battery plants running: commissioning and O&M technicians on grid scale and large commercial BESS sites. Battery calculators with worked steps and citations, cross vendor BMS and PCS fault families, EMS and thermal troubleshooting, protocol and protection references, and site paperwork that becomes clean PDFs. Built for plants with zero cell signal: everything works offline, forever.
BESS is the fastest growing part of the energy build out, and its field knowledge is scattered across vendor manuals that never agree. StoreWatt consolidates it, wraps it in a safety first posture, and puts it in your pocket, no signal required.
SOC windows and usable energy, state of health and augmentation timing, C rate and duration, round trip efficiency, sizing with degradation reserve, throughput versus warranty, and DC conductor and OCPD checks. Every result shows the formula, the worked steps, and the citation.
BMS faults from cell over voltage to welded contactors, PCS trips, EMS dispatch behavior, and thermal system failures, each with the safe response. Brand notes for Sungrow PowerTitan, Tesla Megapack, Fluence Gridstack, SMA, Power Electronics, and EPC Power.
The hard to find stuff: CAN bus diagnostics, Modbus and RS 485 troubleshooting, register map gotchas, DNP3 and IEC 61850 notes, PLC and SCADA platforms, power plant controller behavior, and ANSI protection device numbers.
Decision trees for a plant that is not dispatching, rack and module fault isolation, insulation and ground faults, thermal and HVAC problems, and comms failures. Safety critical findings render red with a stop work posture, never a blind reset.
A LOTO permit built for stranded energy, energized work permits, commissioning and acceptance records, fire and gas verification, ERP drill logs, JHAs, work orders, and O&M checklists. Photos, signatures, and crew sign in, autofilled from your profiles.
Scan a receipt in the truck: on device OCR reads the vendor, amount, date, and category, tags who sent it in and the job number, and emails a clean PDF to the office and to you when signal returns.
Stored and stranded energy, DC arc flash, thermal runaway, and off gassing guidance woven through the whole app, mapped to NFPA 855, UL 9540 and 9540A, NEC 706 and 480, NFPA 70E, IEEE 1547, and the IFC.
Battery plants sit behind fences with no coverage. Every reference, calculator, form, and tree ships inside the app. Outgoing email queues until you find signal.
No account, no server, no analytics, no ads, no tracking. Your site data stays on your device. The only network use is the App Store and the emails you choose to send.
StoreWatt is a field aid, not a substitute for NFPA 855, UL 9540 and UL 9540A, the NEC, NFPA 70E, IEEE 1547, the IFC, manufacturer manuals, or the site PE stamped drawings and Emergency Response Plan. A battery cannot be de energized; treat all components as live. Safety critical work requires an ESS qualified person.