Off-Grid Solar Inverters: Price, Working & When You Need One

An off-grid solar inverter converts DC power from solar panels and batteries into AC power for your home — without any grid connection. It works entirely independently, using battery storage to power your home when solar is unavailable. Off-grid inverters cost ₹12,000–₹1,00,000 depending on capacity. They are essential for locations without reliable grid connectivity — farmhouses, remote homes, telecom towers, and agricultural installations.

An off-grid inverter manages two power sources — solar panels and battery bank — to provide 24/7 electricity without the grid:

1. Solar panels charge batteries — During daylight, solar DC charges the battery bank through the inverter's built-in charge controller (or a separate MPPT controller).
2. Inverter converts battery DC to AC — The inverter draws DC from batteries and converts it to 230V AC for your appliances.
3. Loads are powered continuously — Your home runs on battery-supplied AC power around the clock. Solar replenishes the batteries during the day.
4. Battery management — The inverter monitors battery voltage and state of charge. It disconnects loads if batteries drop below a safe threshold (typically 50% for lead-acid, 20% for lithium) to prevent damage.

Unlike on-grid inverters, off-grid inverters have no anti-islanding — they are designed to operate independently. There is no net metering since there is no grid export.

Off-grid sizing is more complex than on-grid because you must account for battery storage and days of autonomy (cloudy days):

• Step 1: Calculate daily load — List every appliance, its wattage, and daily usage hours. Example: 5 lights (50W × 6h = 300Wh), 3 fans (225W × 10h = 2,250Wh), fridge (150W × 12h = 1,800Wh). Total: ~4.3 kWh/day.
• Step 2: Size the panel array — Divide daily load by peak sun hours (4.5h average in India) and account for system losses (25%). For 4.3 kWh: 4,300 ÷ 4.5 ÷ 0.75 = ~1.3kW panel array.
• Step 3: Size the battery bank — Multiply daily load by days of autonomy (typically 2 days for India). Factor in depth of discharge: lead-acid (50%) or lithium (80%). For 4.3 kWh × 2 days ÷ 0.5 = 17.2 kWh battery bank (lead-acid).
• Step 4: Size the inverter — Must handle peak load (all appliances running simultaneously) plus 20% safety margin.

Complete inverter sizing guide →

Popular off-grid inverter brands in the Indian market:

• Microtek — M-SUN series. India's most recognised off-grid solar inverter brand with strong service network in tier-2/3 cities and rural areas.
• Luminous — NXG series. Trusted Indian brand, wide range from 850VA to 10kVA. Excellent for home and small commercial use.
• Su-Kam / Nexus — Brainy Eco series. Known for pure sine wave output and solar charge controller integration.
• V-Guard — Smart Pro series. Good build quality with comprehensive after-sales support across India.
• Exide — Known primarily for batteries but offers integrated solar inverter-battery combos for off-grid use.

For off-grid systems, prioritise brands with strong rural service networks — when the grid is not available as backup, inverter downtime means no electricity at all.

Before going off-grid, understand these realities:

• Higher cost — Off-grid systems cost 60–100% more than on-grid due to batteries and oversized panels for autonomy.
• Battery replacement — Lead-acid batteries need replacement every 3–5 years. Budget ₹40,000–₹1,60,000 for replacements. Lithium batteries last 10–15 years.
• Load management — You cannot run unlimited loads like on-grid. Heavy appliances (AC, water heater, oven) may require a very large (and expensive) system.
• No subsidy — Off-grid systems do not qualify for PM Surya Ghar or state subsidies. Only on-grid systems get government support.
• Maintenance — Lead-acid batteries need regular water topping and terminal cleaning. Lithium batteries are maintenance-free.

If you have any grid access, a hybrid system is almost always a better choice — it costs less and provides both grid savings and backup.

Off-grid system design requires careful load analysis and battery sizing. Solar Vipani connects you with verified installers experienced in off-grid installations who will design a system matched to your specific energy needs and location.

Get free solar quotes from verified installers →