Load assessment
We list the loads to be backed up, their running wattage, surge behaviour and required backup hours.
Off-Grid Solar
Off-Grid and Battery-Backed Solar Systems
An off-grid solar system stores generated energy in batteries so selected loads keep running without the grid. It suits locations with unreliable or unavailable supply, and costs more per kW than an on-grid system because of the battery and charge control.
An off-grid solar system stores generated energy in batteries so selected loads keep running without the grid. It suits locations with unreliable or unavailable supply, and costs more per kW than an on-grid system because of the battery and charge control.
Overview
Off-grid design starts from the loads you must keep running and for how long, not from roof area. Daily energy requirement, backup duration and surge loads determine battery capacity; the array is then sized to recharge that bank reliably, including on cloudy days.
GLS designs off-grid and hybrid systems with proper charge control, protected battery placement and clear separation of backed-up and non-backed-up circuits.
Who it is for
- Locations with frequent or long power interruptions
- Farms, remote premises and sites without grid access
- Essential-load backup for homes, clinics and small facilities
- Telecom, monitoring and infrastructure installations
How it works
Storage sizing
Battery capacity is derived from daily energy use, depth of discharge and autonomy days.
Charge management
A hybrid inverter or MPPT charge controller manages array, battery and load priorities.
Circuit separation
Backed-up circuits are segregated so high loads do not drain the bank unexpectedly.
Key benefits
- Power availability independent of the grid
- Defined backup for critical loads
- Hybrid option combining grid, solar and battery
- Viable where grid extension is impractical
Technical considerations
- Battery options
- Lead-acid and lithium chemistries differ in usable depth of discharge, cycle life, footprint and cost. Selection is made against your duty cycle.
- Installation conditions
- Battery banks need ventilation, temperature control and safe access; placement is part of the design, not an afterthought.
- Replacement planning
- Batteries are consumable components with a finite cycle life, so replacement is planned into the ownership cost.
Process
01 — Consultation
We understand your load profile, electricity bill, tariff category and objective.
02 — Site Assessment
Roof or land survey covering area, orientation, shadow, structure and electrical infrastructure.
03 — System Design
Capacity sizing, layout, module and inverter selection, cable and protection design.
04 — Proposal & Planning
Detailed scope, bill of materials, indicative generation and commercial proposal.
05 — Engineering & Installation
Structure fabrication and erection, module mounting, DC and AC works, earthing and protection.
06 — Testing & Commissioning
Insulation, polarity, string current, earthing and inverter commissioning checks.
07 — Grid Integration / Handover
Coordination for net-metering or grid approval where applicable, then documented handover.
08 — Monitoring & O&M
Generation review, scheduled cleaning and inspection, and corrective maintenance.
Components we use
Solar Batteries
Batteries store solar energy so selected loads can run when there is no generation or no grid.
Solar Inverters
The inverter converts DC from the array into usable AC power and controls how the system interacts with the grid and batteries.
Solar Panels (PV Modules)
Photovoltaic modules that convert sunlight into DC electricity — the generating element of every solar system.
Project examples
GLS has completed 300+ projects across Tamil Nadu. Case studies in this category are being documented with client approval, and we publish only what owners have confirmed may be shared. Ask us for references relevant to your category and we will send what has been approved for disclosure.
Projects & Case StudiesFrequently asked questions
How long will an off-grid system run my loads?
Backup duration is a design input. It depends on battery capacity, usable depth of discharge and the actual load connected — so it is defined during sizing and stated in the proposal.
Is a hybrid system better than a pure off-grid system?
Where a grid connection exists, hybrid is usually the practical choice: solar self-consumption and battery backup, with the grid available as support instead of a larger, costlier battery bank.
Design a Backup Solar System
A short conversation about your consumption and site is usually enough for us to tell you what is worth doing.