Understanding Inductive Loads affects on a Solar Inverter

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In this video, we show the effects of inductive loads on a solar inverter on the startup of inductive loads.
In this example, we demonstrate a water pump rated at 700W that needs 3.8A of current to run that requires 15.8A of current to start up.
Inductive loads are more complex loads to calculate. Where the current and voltage are out of phase, and therefore there is a secondary voltage created that moves in opposition to the supply voltage. Because of this, they tend to create power surges when turned on or off.
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MSPD Africa is the authorized South African distributor of FoxESS energy storage systems.
FoxESS is a global leader in the development of inverter and energy storage solutions. Engineered by some of the world’s leading inverter and battery experts, the products are breaking new ground; offering you the most advanced product features currently available, coupled with unrivaled performance and reliability.
FoxESS is part of a global conglomerate of renowned and recognized companies. A key shareholder is Tsingshan Group, a Fortune Global 500 company and the largest producer of stainless steel in the world. It has more than 56,000 employees and annual sales revenues in 2022 of 54.4 billion USD.
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Опубликовано:

2 окт 2024

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Комментарии : 8

@thomasmaughan4798 2 месяца назад

Unfortunately, the discussion is NOT about the reactive element where current is out of phase with voltage, but rather, the large starting current demand of a typical electric motor.

@kickgas7171 10 месяцев назад

This is an excellent example as to why you should never, ever purchase a high frequency,, low surge, transformerless inverter. A far better alternative is to invest a little more money and purchase a low frequency, transformer based inverter charger for your solar system. Low frequency transformer based inverters last years and years longer than these toy high frequency inverters and can easily power high surge loads without being damaged. That's why the big name brand inverter manufacturers like Schneider Electric, Outback Power, Sigineer Power, Victron and others, all use a low frequency topology in their offerings. I know this to be true because I've spent the last 23 years repairing inverters. High frequency solar generators/inverters simply don't last when powering inductive loads.

@HarukiYamamoto 4 месяца назад

What inverter size can I use to power a single phase, 3kw, 240v induction motor off of batteries without frying my system?

@MSPD-Africa 4 месяца назад

for that please use the inrush current function on your meter to measure like in the video

@thomasmaughan4798 2 месяца назад

The starting current of an induction motor, also known as inrush current, is usually 5-6 times the motor's full load current (FLC). However, during the first half cycle of the electrical supply, the current can be more than 20 times the FLC. A "slow start" circuit can alleviate most of this problem but might cause the motor to fail to start. It's torque is very weak at startup.

@markericsonque6180 Год назад

Can you clarify how is it not able to startup the irush current of 15.8A? if the 5KW inverter can provide a max 22.7A of current (assuming 220v)?

@markbecker3278 Год назад

Dear Mark, thank you for your great question. You are correct we are using 220V and in this case, the inverter did run the pump. However, in the real world and the inverter is not only running a pump in the client's home but is also powering other appliances at the same time. The overload and questions from clients typically come when the pump starts in conjunction with other high-load kitchen appliances like a kettle toaster and or microwave are turned on causing an overload. In most cases, as the pump turns on automatically with a pressure sensor switch and not the client turning it on an inverter overload then occurs. Hence the question but it's only 700W pump, how can it create an inverter overload?

@Dc_tech386 Год назад

Garbage the only why any inverter refuse to start up a induction motor is the design I design many inverter high and low frequency and all design under 5kw start any induction motor if the overloaded potentiometer is adjust below 3kw and the motor is a 2kw motor then it won’t start the surge current will trigger the sensing voltage turning off the spwm signal powering down the inverter that’s how inverter work and most time factory don’t spend time to adjust the overall loading process so you end up will a powerful inverter that cannot release it powerful due to overloaded sensor controller not tune to the load ratio