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By Sona Brands

On 3, 2023

11,990,689 Views

A heater requires a lot of power, which is why it is often used on an AC load. However, an inverter or solar powered system with sufficient capacity can run it.

The runtime will be determined by the inverter capacity and battery size. A 2000-Watt inverter can power a 1500W heater, but a 300Ah battery will only last about an hour if the heater runs continuously.

Heater & Inverter Sizing Guide

Heater Wattage	Recommended Inverter Size
400W Heater	750W - 1000W (1kVA) Inverter
750W Heater	1000W - 1500W Inverter
1500W Heater	2000W - 3000W (3.5kVA) Inverter
2000W Heater	3000W (3.5kVA) - 5000W (5kVA) Inverter

Rule of thumb: Choose an inverter with a continuous wattage rating at least 25-30% higher than your heater's wattage to handle inefficiency and ensure safety.

Inverter & Battery Sizing for a 1500W Heater

Desired Runtime	Recommended Battery Bank	Recommended Inverter
Up to 1 Hour	1 x 100Ah 24V Lithium Battery	2000W (2kVA)
1 - 2 Hours	2 x 100Ah 24V Lithium Batteries	3000W (3.5kVA)
2 - 4 Hours	2 x 100Ah 48V Lithium Batteries	5000W (5kVA)

Appliance Power Consumption Guide

Appliance	Typical Wattage
Space Heater (Medium)	1500 Watts
Microwave Oven	1000 - 1500 Watts
Electric Kettle	1500 - 2000 Watts
Air Conditioner (Small)	800 - 1200 Watts
Refrigerator	150 Watts (Running)

Which Inverter Should You Use For Heaters?

A pure sine wave inverter provides better performance than a modified sine wave model. Pure sine inverters are more efficient, meaning less energy is lost during the conversion from DC (battery power) to AC (appliance power). For a power-hungry device like a heater, this is critical.

Can I Use an Inverter or My Solar Powered System to Run a Heater?

A high-quality system like the Must 5.2kVA (48Volts) Off Grid Inverter in Zimbabwe (High Voltage) is an excellent choice for heaters of this size. While it costs more upfront, the efficiency gains mean your solar batteries will last longer for each charge.

How Long Can an Inverter Run a Heater?

This depends entirely on your battery bank. A 2000W Inverter powered by a 400Ah battery bank can run a 1500W heater for 2 to 3 hours, which is typically enough to warm a room. You can combine four 100Ah batteries like the MUST Wall Mounted Lithium Battery (LiFePO₄ Battery 48Volts) to achieve this capacity. Remember, if you add other appliances, you will need more battery power.

Tips to Reduce Heater Power Consumption

Use the right size: Match your heater to your room size to avoid wasting power.
Buy smart: Choose heaters with timers and digital thermostats to regulate temperature efficiently.
Insulate your home: Fix any gaps and cracks where cold air can enter to reduce the heater's workload.
Buy quality: Invest in a quality, efficient heater and a pure sine wave inverter from a trusted provider like Sona Solar Zimbabwe.

Running a heater on an inverter is possible but requires careful planning. The key is ensuring your inverter and, most importantly, your battery bank are sized correctly for the high power demand.

Can a Solar Inverter Run a Heater in Zimbabwe? (2025 Guide)

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