The quality of the electromagnetic switch does not meet the requirements. Firstly, there is a quality issue with the switch. If the quality of the switch itself is not good, it is more likely to be damaged.
Starting a gas generator set in winter is relatively difficult, with a long starting time and a large number of starts, which can easily cause poor contact or sintering between the movable contacts inside the electromagnetic switch and the static contacts of the two terminals. You can understand that gas generators also need to hibernate.
If it is difficult to start a gas generator set with one battery in winter, two batteries can be used in parallel to start the unit. The purpose is to increase the battery capacity while the voltage remains unchanged. However, the key problem is that some operators of the gas generator set connect the two batteries in series and start the biogas generator set by increasing the voltage. If the electromagnetic switch requires starting with 12V DC power and starting the gas generator set with a 24V battery, it is more likely to cause poor contact or sintering between the movable contacts inside the electromagnetic switch and the static contacts of the two terminals.