Shaping the Future with Sustainable Power
Off Grid Solar System
Overview
Grid-Tie RTS Solutions
On off-grid rooftop solar system is a rooftop solar energy system that is not connected to the electrical grid and is totally independent of the utility grid. Instead, it uses PV panels to generate power, use it during the day, store excess energy in batteries to power your home during outage or at night. The off-grid system may OR may NOT have battery storage as part of solution. There are houses and communities that are far from the grid and have not connected to the grid can decide to go for off-grid solar solutions.
Unlike on-grid RTS system, where power generation in the RTS stops when grid is down, the off-grid RTS provide power even during the grid outage as they are independent of grid. (same is true for hybrid solar system). In terms of cost, off-grid solar systems are the most expensive because of the cost of battery storage, followed by hybrid while on-grid solar systems are the least expensive.
Generate electricity using solar and store so that you save on your electricity bill and never experience a power outage. Also, ideal for those living in areas where there is no grid but only sun".
Advantages
- Ideal for areas witnessing frequent grid power outages, or rural areas where NO grid connection. NO power generation issues even when grid power is down. Power is drawn directly from panels OR from battery with advantages of 24×7 power backup.
- No CESCOM approvals needed; No CESCOM restrictions on KW capacity and on areas of installation.
Disadvantages
- No subsidy available for off-grid solar systems.
- No advantage of net metering, since no export to grid, excess electricity is stored in batteries and surplus power production goes waste.
- Expensive solution due to battery storage cost.
What components do Off-grid Solar Systems have ?
Off-grid systems have few additional components compared on-grid systems.
- Standard RTS components :PV panels, mounting structures and connectors. (Off-grid systems may use ground-mounted arrays, which are mounted differently than rooftop panels. May have single/multi axis sun trackers for improved power generation).
- Off-grid inverter: Off-grid inverters need not have to match phase with the utility since they aren’t connected to the grid.
- Solar batteries: for use when panels aren’t generating electricity. Often C10 deep cycle lead-acid solar batteries (different than normal UPS batteries) are used. Advanced Lithium-ion (LFP) batteries are now popular with higher DoD advantage to have more energy units backup.
- Solar charge controller : between the panels and the battery, to manage optimal battery charging.
- Other standard BOS components : AC/DC connectors/safety disconnects, MCB etc. (Off-grid systems have one additional DC disconnect between the battery and the off-grid inverter to stop current from flowing between the two and is important for maintenance and protection).
- Backup generator (optional): may be used as backup to ensure an additional power source, typically in industrial setup.
When to go for Off-grid ?
Off-grid solar solutions are generally more expensive than on-grid systems and are recommended only in specific situations. You may consider an off-grid system if there is no electricity grid in your area, if your existing grid supply is highly unstable and you require reliable 24×7 backup, or if the nearest grid connection is too far and cabling costs are too high. In cases of frequent power outages or when using a generator for backup, a combination of on-grid rooftop solar (RTS) with a minimal-capacity off-grid solar UPS can be a more cost-effective alternative, helping reduce fuel expenses and even achieve a near-zero electricity bill. Additionally, if rooftop space is insufficient for an on-grid system and local regulations (such as CESCOM norms) restrict panel installation outside the roof, an off-grid system may be suitable, as it does not require such approvals and allows panels to be installed in any open area within the premises.
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