Maretron DCM100 用户手册

 

 

 

 

1.  Lead-acid batteries generate explosive gases during operation.  Make sure that the 

area around the batteries is well-ventilated. Never allow flames or sparks near a battery. 

2.  Wear clothing and eye protection when working with batteries. If battery acid comes into 

contact with your skin or clothing, wash them immediately with soap and water. If 
battery acid contacts your eyes, immediately rinse your eyes with cool running water for 
at least 15 minutes, and immediately seek medical attention. 

3.  Be careful when using metal tools on or around batteries. If a metal tool falls between 

the battery terminals, it can cause a short-circuit which can generate sparks, igniting 
fuel fumes, or may also cause the battery to explode. 

4.  Remove metal items like watches, necklaces, rings, and bracelets when working with 

batteries.  If these items were to contact the battery terminals, the resulting short-circuit 
could produce a current which could melt the objects and possibly cause severe skin 
burns. 
 

When charging a battery, not all of the electrical energy put into the battery is stored as 
chemical energy. This section details how the DCM100 accounts for this type of inefficiency. 
 

The Charge Efficiency Factor (CEF) represents the percentage of electrical energy that is put 
into a battery that is stored as electrical energy, measured at 25°C.  An ideal battery would 
have a charge efficiency factor of 1.0, or 100%.  A new flooded lead-acid battery may have a 
CEF of 0.95, or 95%.  This value means that if 100 Amp-hours of energy are put into a battery 
by a charger, this results in the battery’s charge increasing by only 95 Amp-hours.  The 
DCM100 is capable of calculating a battery’s charge efficiency factor on the fly, as the battery 
is being charged and discharged, to produce the most accurate state of charge values. 
 

In an ideal battery, 100% of the energy in the battery would be available no matter what 
discharge current is used.  However, with lead-acid batteries, the energy available from a 
battery depends on the rate at which a battery is discharged – the faster you discharge the 
battery, the less energy is available. 
 
The Amp-hour capacity of most batteries is specified using a 20-hour rate; that is, the Amp-
hour capacity rating of the battery is calculated if the battery is discharged from 100% to 0% 
using a constant current over the period of 20 hours. If the battery is discharged at a faster 
rate, then it will output less than the rated Amp-hour capacity before becoming fully 
discharged. 
 

This effect was presented by a German scientist, W. Peukert, in 1897. He formulated an 
equation which closely approximates the effect of discharge rate on battery capacity. A