Brina Kallett

The economic lot size of an order depends upon two types of costs:

i. Inventory carrying costs and

ii. Procurement or set up costs.

EQO gives the order level where total costs i.e., inventory carrying and procurement costs are minimum.

EOQ formula is based on certain assumptions:

i. Demand for the product is known and constant.

ii. Lead time is known and constant.

iii. The receipt of inventory is instantaneous.

iv. Quantity discounts are not availed.

v. Stock outs and shortages are not considered.

Let Q be the Economic Order Quantity (EOQ), R be the demand per unit time in units,

C3 be the procurement cost or set up cost per order,

C1 be the stock holding or inventory carrying cost per unit item per unit time.

Total Annual Inventory Cost:

= Total Ordering Cost + Total Inventory Carrying Cost … (1)

Total Ordering Cost:

Total Inventory Carrying Cost:

(From Fig. 4.1, if total quantity is OB i.e., Q, then average inventory=Q/2)

Putting expressions of (2) ad (3) in (1)

The objective is to determine the quantity to order which minimizes the total annual inventory cost.

So to minimize the total cost, differentiate Total Cost (TC) w.r.t. Q and equate to zero.

Example 1:

A dealer has to supply 1000 units of a product per year to his customer. The inventory holding cost is Rs.2.40 per unit per year and ordering cost per order is Rs.350. Determine EOQ.

Solution:

Example 2:

Given the annual consumption of material is 3600 units, ordering costs are Rs.4 per order. The unit price of material is 64 paise and storage costs are 50% per annum of stock value. Find the economic order quantity in units.

The demand and availability for solar charge controllers in India have catapulted over the years as they provide system protection. It can be a confusing task to choose the best solar charge controllers in India, and hence, we have provided you with a list of some of the best products. Along with this, we have also prepared a list of some important factors to consider before buying solar charge controllers.

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One of our top picks, the amiciSmart Solar Charge Controller is suitable for multiple types of batteries – it works perfectly with lithium, lithium-ion, and lead acid batteries. In addition, it’s easy to set up, making it a good choice for inexperienced people too.

This solar charge controller can detect the battery type accurately and display the battery status on the LCD screen. The best thing about this device is that it comes with overload protection, short-circuit protection, open-circuit, and reverse protection. This ensures your battery is protected against fluctuations, increasing its lifespan.

The only drawback of this solar charge controller is the absence of a backlight on the display, which makes it difficult to view in dim light. But apart from that, this product doesn’t disappoint, making it a worthy purchase any day.

Luminous is a popular brand for its range of solar system products starting from solar panels and batteries to solar charge controllers. Here we shall review the Luminous 10Amp plastic solar charge controller, which is available in blue. This controller prevents the battery from getting overcharged while the solar panel is charging it. Along with this, it also prevents reverse current flow at night.

An in-built USB port is provided in the solar charge controller that can be used to charge mobile phones without an adapter. This controller is made of supreme-quality plastic that can withstand harsh conditions and still lasts for a very long time without any damage. It can charge batteries of 12V and 24V with utmost efficiency using PWM technology.

It comes with 96% electronic shock protection and an in-built load controller. This is provided with an lvd feature option for lead-acid or other types of batteries. Up to 400 watts of solar panels are supported by the Luminous solar charge controller. You might wonder what purpose the 2 jumpers behind the controller serve.

The two jumpers are required to connect the solar charge controller to an SMF battery. You do not need these two points if you are using a different battery. You can keep a watch on the status of the battery and control all other features of the controller through the LCD screen on it. The product measures 7.2*14.5*13.7 cm and weighs only 300 grams. This compact and lightweight nature of the Luminous solar charge controller makes it highly portable and beneficial to keep in areas with limited space.

The brand provides a 12-month warranty and you can seek help from the company, free of cost, for any damage caused to the solar charge controller during this period.

The UTL Solar Charge Controller cum Hybrid SMU is a reliable and heavy-duty device that comes with overcharge, under voltage, and deep-discharge protection to ensure the battery’s longevity. And with its temperature protection feature, you can say goodbye to overheating issues.

Converting your existing inverter into a solar inverter is totally hassle-free with this device, thanks to its easy installation process. You can even view the operating status and data on the digital LCD screen to analyze the units you have saved. And the best part – the screen is backlit, which allows you to see the status even in the dark.

This device has a metal body which adds to its sturdiness and durability.  It is quite compact and can even be mounted on a wall for better space utilization. However, this device doesn’t come with an operation manual, which can make it slightly challenging for first-time users.

The UTL MPPT SMU Automatic Solar Charge Controller is a highly efficient device that is equipped with a high-speed microcontroller to improve functionality. It is compact and lightweight, and its wall-mounted design makes it suitable for use even in smaller spaces.

This heavy-duty device comes with protection against overcharge, undercharge, and voltage fluctuations, which ensure the longevity of solar batteries. It supports both 12V and 24V solar panels and is compatible with tubular and SMF batteries. And that’s not all, this reliable charge controller can be operated even in harsh temperature conditions, thanks to its wide operating temperature range of 0°C to 50°C.

All these features come at a price, literally – this solar charge controller is slightly more expensive, although the price is justified considering its efficiency. However, it may not be the best choice for people on a tight budget.

If you are looking for a small, lightweight, and highly convenient solar charge controller that would fit within a small budget, the SSUCA Solar Charge Controller is perhaps the best you can get. This compact device supports 12V and 24V solar panels and is equipped with all the necessary safety features to protect your battery from charge and voltage fluctuations.

It comes with dual USB outputs that allow you to charge your phone, tablet, laptop, and other devices as required. This charge controller is also equipped with a digital LCD screen to help you view the operating status and data at all times. It even comes with a 12-month warranty.

However, this device isn’t compatible with all types of batteries – it only supports lead-acid batteries. Therefore, make sure to check your battery type before purchase.

The Luminous SCC 1220NM Solar Charge Controller is a highly-reliable device that increases the longevity of any battery thanks to its smooth and stable output. This small, lightweight, and affordable device is easy to install and is designed to be durable.

This low-maintenance solar charge controller comes with reverse current and overcharge protection to safeguard your battery at all times. You also get a built-in USB port that allows you to charge your phone or other USB devices without the need for an adapter.

This PWM solar charge controller is compatible with lead-acid and SMF battery types and can support both 12V and 24V solar panels. On the downside, the charging speed is slightly slow, which may be an issue for some people.

The Smarten Prime+ 12/24V 50A MPPT Solar Charge Controller is designed to extract up to 100% of power from solar panels to boost your savings. This reliable device is easy to install and supports both 12V & 24V panels.

It is highly efficient and offers complete protection against issues like voltage fluctuations, overcharge, reverse current, over-temperature, etc., that may otherwise lower battery life. The product is equipped with a backlit digital LCD screen that allows you to view the status and also check the units you have saved. In addition, you also get a 12-month warranty against all manufacturing defects.

The main drawback of this product is that the quality of some specific parts such as the power cords is less than satisfactory. However, when it comes to efficiency, there isn’t much to complain about this heavy-duty device.

The first and most important factor that you must have some knowledge about before buying the best solar charge controller in India is the types of controllers available.

You must check the maximum current rating of the solar charge controller before making a purchase. It tells a lot about the performance of the controller as well as its capability of handling high-load appliances. It indicates the maximum current that the device can deal with. Basic budget models can usually handle 10 or 20 amps of current, whereas the more high-end ones can handle 30 to 40 amps.

This is another crucial factor that you need to consider. The voltage rating does not affect the performance of the controller in any way but it ensures the versatility and compatibility levels of the device. Almost all the solar charge controllers mentioned in this article are compatible with both 12-volt and 24-volt solar panel systems.

Once installed, solar panels tend to last for decades. However, this is beneficial only when the other parts of the solar panel are just as reliable. To ensure that the solar system functions for a long time, check for the warranty offered by the solar charge controller company. Most of these devices come with a 1-year warranty but a few better ones have a 2-year warranty on them.

MPPT solar charge controllers have a higher power output compared to PWM solar charge controllers. It can harvest an additional 11.1% of energy. Thus, MPPT is better than PWM.

This depends on the amount of energy that your solar panels produce. You require a solar charge controller that can handle this load efficiently. Thus, if the panels produce 480 watts of energy then you require a 20 amps solar charge controller. Typically, the amperage rating of controllers ranges from 1 to 60 amps.

A 20 amps solar charge controller can handle approximately 480 watts.

A solar charge controller is essentially a protective guard that limits electrical energy flow from the solar panels to the battery. It prevents overcharging as well as undercharging. It also protects against excessive voltage flow.

Solar charge controllers are a boon for all solar panel users because of the crucial protection to the solar battery. A lot of damage is possible without the controller regulating the flow of energy from the solar panels. Through this article, we have tried to provide you with adequate knowledge about the workings of a solar charge controller along with a list of the best solar charge controllers in India. We hope it benefits you in making the right decision.

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