Dozens of ratings of the «best charging stations appear on the Ukrainian Internet every fall. The problem is that after a year the models change, the prices move, and the tips remain the same - buy this. This material is arranged differently. This is not about specific models, but about how to independently calculate what you need. Because buying equipment according to someone else's — rating is the most common way to overpay or, on the contrary, get a device that does not pull the refrigerator.

The method does not change. Models - yes.

Two numbers that everyone confuses

This is the main misunderstanding in the topic, and most of the mistakes when buying are made because of it.

Watt-hours (Wh) is capacity. How much energy is inside. Answers the question «how long it will work».

Watts (W) is power. How much can the device give at the same time. Answers the question «that you can connect» at all.

Example. A station with 2000 Wh and 300 W of power will hold the router for weeks, but the refrigerator will not start at all - there will not be enough power. And vice versa: a 2,000 W station with a capacity of 300 Wh will turn on anything, but will sit down in twenty minutes. Both numbers are required. Looking at only one thing is a typical buyer's mistake.

The third number that is forgotten: peak power

Devices with an electric motor or compressor at the time of start-up consume much more than in operation. This is called the starting current. Refrigerator in operation 150-200 W. At the start of the compressor, 400-600 W. Heating circulation pump 150-300 W nominal, 600-900 W at the start. That is, if you calculated the station at exactly 200 W «because the refrigerator eats so much», it will turn off at the first start of the compressor.

Rule: for equipment with a motor, set the power three times greater than the nominal power.

Pure sine wave is not marketing

Another parameter that is saved and then regretted.

Cheap inverters produce a modified sine wave - a rough approximation to the normal current from the network. It doesn't matter for a light bulb or charging your phone. For equipment with an electric motor, compressor or complex electronics, it is very important. On a modified sine wave, refrigerators hum and heat up, boilers may not start or make an error, and the service life of the equipment is shortened. A refrigerator, gas boiler and pump require a clean sinusoid, this is a requirement.

Battery type

Li-ion - lighter and cheaper, but the resource is smaller.

LiFePO4 - withstand 3000+ charge cycles, safer, more stable.

For frequent outages, LiFePO4 justifies the price difference. The logic is simple: if the station discharges and charges every day, about 700 cycles will be collected in two years. The cheap battery will noticeably sag by this time, LiFePO4 will not. If the device needs «just in case» and is used several times a year, there is no point in overpaying.

How to calculate your need

Here is a method that always works, regardless of year and models.

Step 1. Write out what should work. Not «to make everything work», but a specific list. For most apartments, these are: router, phones, lighting, laptop. Next, as needed: refrigerator, boiler, pump.

Step 2. Find everyone's consumption. It is indicated on the sticker on the device itself or in the instructions. Landmarks:

  1. Router 10-20 W
  2. LED lamp 5-10 W
  3. Laptop 45-90 W
  4. TV 50-150 W
  5. Refrigerator 150-200 W (peak up to 600)
  6. Gas boiler with pump 150-300 W (peak up to 900)

Step 3. Make something that will work at the same time. This will be the minimum required power. Add margin to peak values.

Step 4. Multiply by hours of autonomy. If you need 200 W for 6 hours - that's 1200 Wh. Add 20-30% on top: the real return is always less than the passport due to conversion losses. All. These two numbers - power and capacity - are your technical task for purchase.

Three levels of autonomy

A practical typology that is easier to start from.

Level 1: communication. Powerbank for 10,000–20,000 mAh plus a small router device. Closes the most important thing - the phone and the Internet. The cheapest level and the one to start with if there is no budget at all.

Level 2: apartment. The optimal compromise is a LiFePO4 station of about 1000 Wh with a power of 1200–1800 W. This is enough for a router, lighting, laptop and refrigerator for several hours. For long-term outages, it is better to look towards 2000 Wh.

Level 3: private house. Other figures here: from 2000 Wh, power over 2000 W, preferably expandable. The reason is a boiler, a heating and water supply pump, which are not your concern in the apartment, but yours in the house.

The main question to answer honestly is: do you need to survive the shutdown or not notice it? This is a difference of several times according to the budget.

A feature that should be viewed separately

UPS mode - the station is turned on in the outlet, the equipment is connected through it, and at the moment of the disappearance of the light, the switching takes place in milliseconds.

Practical value: the computer does not turn off in the middle of work, the boiler does not reset, the router does not reboot. Plus, the station works as a voltage stabilizer, which is a separate benefit for old networks.

Security: a section that is more important than all the previous ones

It is short and straightforward here, because it is a matter of life.

The generator cannot be started indoors. Never. Not in the garage, not on the balcony, not in the basement, not in the entrance, not in the open door. The exhaust contains carbon monoxide - odorless, colorless, without warning. Poisoning occurs quickly, and a person often does not have time to understand what is happening.

Every heating season in Ukraine, people die from this. The generator works only outdoors, at a distance from windows and ventilation holes.

Candles are the main cause of fires during outages. An LED lantern costs several hundred hryvnias and does not have this problem. If you still use candles - a stable base, away from curtains and paper, and never leave them unattended.

Do not connect the station to home wiring yourself. This is work for an electrician. Incorrect connection creates backvoltage in the network - and this is dangerous for repair crews working on the line.

Charge the station in advance. The most common household error: the device is there, but it is discharged, because after the last shutdown it was not put on charge.

What people overpay for

They buy power instead of capacity. The low-capacity 3,000-watt station looks solid but doesn't last long.

They take a solar panel for the apartment. It makes sense for a country house or a house with a plot. For a balcony in the city in winter, the return is minimal, and it is expensive.

Chasing a brand. Key parameters - battery type, clean sine wave, capacity, power. Everything else is secondary.

They buy one large station instead of two levels. It's often wiser to have a power bank for daily wear plus a station at home than one heavy thing you won't get anywhere.

What is wasted

Pure sine wave. The price difference pays off with the first surviving refrigerator.

Power reserve. Calculation of «close to» does not work due to starting currents.

Powerbank quality. Nameless devices with a claimed 50,000 mAh for four hundred hryvnias are not savings. There is neither such a capacity, nor control over the temperature of the elements.

Checklist before purchase

  1. Did I write a specific list of devices?
  2. Did I calculate their total consumption?
  3. Did I consider peak loads for engine equipment?
  4. Do I need a clean sine wave?
  5. How many hours of autonomy do I really need?
  6. Is it a one-time need or a daily one (the type of battery depends on it)?
  7. I have a plan for how and when I will charge this device?

Summary

Autonomy is about knowing exactly what should work and how long. A person who has spent half an hour calculating usually buys cheaper and gets exactly what is needed. The person who took the rating often pays for power that he will never use, or finds that the refrigerator still does not start. And the most important thing to remember about all this equipment: it works only when it is charged.


Sources: Kirovograd.net, industry guides for the selection of charging stations, manufacturer data