Solar inverter and battery backup calculator to estimate required inverter size, battery capacity and solar panel wattage.
SPS MPPT solar hybrid inverter, MPPT charge controller, LiFePO4 lithium battery, solar panels and wind turbines in India.
What you should know
Solar Payback Period Calculator India decisions become easy when you treat it as a system: inverter + MPPT charging + battery + solar panels + protection. This guide focuses on practical sizing and selection to avoid under/over-sizing.
On this page
Selection Checklist
Use this step-by-step checklist to choose the right inverter, battery, and solar panel size.
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01
Understand your load
List appliances, watts and daily usage hours. Separate continuous load from surge loads like pumps.
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02
Pick the right inverter type
Hybrid inverters combine inverter + charger. MPPT models support higher PV voltage and better harvesting.
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03
Choose battery technology
LiFePO4 offers higher usable capacity and longer cycle life. Lead-acid is cheaper upfront.
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04
Plan solar panel wattage
Match panel watts to daily energy and available sun hours. Consider roof area and string voltage limits.
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05
Design wiring & protection
Use correct cable gauge, DC isolators, fuses/MCBs, earthing and surge protection for safety and reliability.
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06
Install & tune
Set charging profile, battery cutoffs, and priority (solar/grid/battery). Test loads and monitor performance.
Pricing notes
Prices vary based on inverter kVA rating, battery voltage (12V/24V/48V), PV input range, and brand. Lithium batteries increase initial cost but can reduce lifetime cost due to longer cycle life.
Tip: Share your load list + backup hours on WhatsApp for the closest matching product recommendation.
Recommended Categories
Browse the most relevant product categories for your setup.
Frequently Asked Questions
What inputs are needed for backup calculation?
Total load in watts, backup hours, inverter efficiency, and battery DoD/usable capacity.
Do lithium batteries change the calculation?
Yes. Lithium (LiFePO4) typically allows higher usable DoD and maintains voltage better under load.
What is a safe inverter size margin?
Typically 20–30% headroom over continuous load, and higher for motor surge loads.
How many solar panels do I need?
Panel watts ≈ daily energy (Wh) ÷ peak sun hours, with 15–25% loss factor.
Is MPPT necessary?
MPPT is strongly recommended for better harvest and to support higher PV string voltages.
Can I run AC, fridge, and pump together?
Possible if inverter surge rating and battery current capability are adequate.
Need exact sizing? Message us your load list and we’ll suggest a suitable combination.