Project case study · Off-grid solar + storage
Victron Off-Grid Solar + Storage
A fully off-grid 24.61 kW design coordinating split-phase Victron inverter/chargers, six MPPT controllers, 30.72 kWh of battery storage, generator backup, rapid shutdown, and whole-home distribution.
The design challenge
A complete power system without a utility connection
Off-grid design requires every operating source and energy path to work as one intentional system. This project had two PV arrays, six charge controllers, a 48V battery bank, dual inverter/chargers, a portable generator, rapid shutdown, and 120/240V backed-up load distribution—with no utility grid available as the default source.
The drawings needed to make DC collection, battery protection, split-phase AC output, generator input, grounding, disconnects, communications, and emergency shutdown clear. Equipment ratings and operating relationships also had to remain consistent across every diagram and schedule.
Project identity and exact site details are withheld in the public sample.
Design response
PV, batteries, generation, and loads coordinated end to end
Solar generation
- 46 Adani Solar 535W modules
- Two arrays containing 40 and six modules
- Six Victron SmartSolar MPPT 250/100 controllers
Off-grid power conversion
- Two Victron Quattro 48/10000 inverter/chargers
- Split-phase 120/240V operation
- Victron Lynx Distributor and Cerbo GX monitoring
Storage and generator
- Six EG4 LL-S 48V 100Ah batteries
- 30.72 kWh combined storage capacity
- Predator 9000W portable generator input
Safety and field documentation
- Tigo module-level rapid shutdown
- Dual RSS transmitters and coordinated shutdown labeling
- Site plans, single-line diagrams, equipment data, and placards
What the plan set demonstrates
Off-grid reliability begins with documented operating paths
The 31-page package shows how energy moves from both arrays through charge control and DC distribution, into battery storage, through the paired inverter/chargers, and finally to 225A backed-up load centers. It also documents where the generator enters the system and how disconnecting and shutdown functions are arranged.
That complete path matters because an off-grid system must supply, store, convert, protect, and distribute power without depending on utility support. The permit drawings bring those functions into a coordinated package that can be reviewed, built, labeled, and serviced.
Representative equipment
- Adani Solar ASB-M10-144-AAA modules
- Victron Quattro inverter/chargers and SmartSolar MPPTs
- EG4 LL-S batteries in two cabinets
- Victron Lynx, Cerbo GX, and Tigo rapid shutdown
Building an off-grid power system?
Send the load requirements, site information, generation sources, and equipment you are considering. Gemini Solar Design can organize the architecture and define the documentation needed for a buildable system.