During the working process of fireplaces with water jackets connected to a central heating, the uninterrupted operation of the water circulator pump is essential. If this pump stops, the water system will not be able to cool itself in the radiators, which can lead to overheating in thispart of the system, which is set closest to the working fireplace, and will cause severe damages. So in this type of systems, as well as in systems with solar collectors, there is always additional power supply, which starts functioning automatically in case of main power supply drop. This emergency power supply includes an inverter with appropriate capacity, a battery as an emergency power source, as well as protections and cables.
Often called UPS (Uninterruptible Power Supply) for fireplaces, this is a device which produces voltage that ensures the correct operation of the local heating in case of drop or fluctuation of the mains voltage. Furthermore, the device automatically charges the battery, in the presence of mains power, and after full charge it switches to reserve mode until the next outage of the central power supply. The heart of this device is the inverter,
which converts the DC voltage coming from the battery (around 12 volts) into AC mains voltage (220 volts). To provide normal operation of circulator pumps in the system, the inverter has to produce sinusoidal voltage. An inverter with pure sine wave provides quality power supply of the pump. If the system contains an inverter with modified sine wave, the pump will heat up, make loud noise and in case of continuous operation it can burn out. The period in which the emergency power can be maintained depends on the power (capacity) of the battery measured in Ah (ampere-hours).
When choosing the inverter power, it is best to consult a specialist. It should be borne in mind that loads with inductive or capacitive nature, such as pumps, refrigerators, air conditioners, etc. require 4-5 times larger inverter power than that of the connected consumers. The polarity of the connection in the DC part of the circuit should also be observed. If you still swap the polarity, the inverter has a fuse that will burn out and will save the costly equipment from damage. When selecting an inverter it is important to pay attention to the characteristics of the device.
Prices vary widely and you need to seek the most effective solution with the best price. In conclusion, we will point out that regardless of the quality and price of the installed equipment, in order to achieve maximum comfort through local heating, where the energy is derived from fossil sources, gas burner or a photovoltaic panel, the electric power supply remains the most unreliable component in the system. Problems with electricity is one of the most common causes for serious damages in domestic heating, therefore the expenses for emergency power supply must be entered in the „mandatory“ column otherwise you may suddenly find yourself in a situation in which efforts and resources have been wasted.