DC Generating Sets

Innovation & reliability for future communications

The COELMO DC generator set often operates at an average load very low, especially when used in conjunction with a renewable resource generation system (solar, wind, etc.).

When this is the case, it increases fuel consumption and shortens maintenance intervals, also due to the higher amount of combustion residue.

DCi Series Generators

COELMO® DCi Series Generator sets Variable speed generators have been designed and implemented to solve the problems of low efficiency and high maintenance.

With a permanent magnet generator (PMG), electronic management and AC/DC converter, the COELMO® DCi generator set always runs at speed to maximise maintenance frequency and reduce noise, with stable voltage and low output ripple.

COELMO® DCi series variable speed generator sets are recommended for applications where peak power is significantly higher than the average load, achieving fuel and maintenance savings of approximately 40% compared to traditional generator sets.

Available products on offer

Technical data

Model	TEL40-48GV	TEL6.5-48GV	TEL12-48GV	TEL18-48GV
Engine
Engine Model	403D-07 Perkins	403D-07 Perkins	403D-15 Perkins	404D-22 Perkins
Nominal Power	4 kW	8 kW	12 kW	20 kW
Speed Regolation	DC Linear Actuator	DC Linear Actuator	DC Linear Actuator	DC Linear Actuator
Speed Range	1400 - 1800	1400-2400	1400 - 2300	800-1900
N. of Cylinders	3	3	3	4
Displacement	0,76 l	0,76 l	1,5 l	2,2 l
Fuel Consumption	0,7 - 1,7 l/h	0,7 - 2,4 l/h	1,0 - 4,7 l/h	1,6 - 6,5 l/h
Cooling System	Water	Water	Water	Water
Alternator
Permanent Magnet Generator	AMP-04	AMP-07	AMP-12	AMP-18
Output Voltage	44 - 60 Vdc	44 - 60 Vdc	44 - 60 Vdc	44 - 60 Vdc
Voltage Ripple	< 150 mV pp	< 150 mV pp	< 150 mV pp	< 150 mV pp
Efficiency	90%	90%	90%	90%
Operating Temp.	-10°C / 60°C	-10°C / 60°C	-10°C / 60°C	-10°C / 60°C

Accessories

1. Water separator
2 Anti-sand filters
3 Automatic fuel decanting system

Maintenance kit

4 Air filter
5 Oil filter
6 Automatic oil top-up
7 Cyclone air filter

Large capacity integrated fuel tanks

8. 200 l
9. 600 l
10. 1000 l

COELMO Generators

Generators in telecommunications

BTSs are emergency components of any mobile phone network as they allow the user to access the network. The transmission of voice and data and the widespread deployment of wireless services require a small amount of power, but continuously and reliably.

Coelmo has developed several high-efficiency solutions for BTS sites, from the most traditional to full hybrid systems that use alternative energy sources, battery storage systems and variable-speed DC generating units that drastically reduce the environmental impact in terms of emissions. Coelmo is able to offer the ideal solution for all environmental and usage conditions, minimising capital costs (CapEx) and optimising operating costs (OpEx).

Alternating current (AC) or direct current (DC)?

Nowadays, most telecommunications equipment is designed for DC power. If an AC unit is installed, a DC rectifier is required, which loses almost 5-10% of efficiency. DC rectifiers are also a common point of equipment failure in telecommunications facilities.

By using a DC generator set in a hybrid system, a rectifier is not required.

better energy efficiency = less fuel consumption
less equipment heating = less site cooling = less fuel consumption
less frequent maintenance = lower maintenance costs

An additional advantage of a hybrid system based on a DC generator is that a separate battery charger is not required, as the generator can charge the battery bank directly.

Fixed or variable speed gensets?

A variable-speed genset is a genset that is able to regulate power according to the load at a particular location.

Unlike traditional generator sets, which can only operate at standard speeds (3000/1500 rpm @ 50 Hz or 3600/1800 rpm @ 60 Hz) delivering only rated power, the variable speed generator set, equipped with a permanent magnet generator (PMG) and electronic management system, is designed to deliver the exact power required by the site, following load changes, maximising interval operation and reducing noise.

DC GENERATORS

Characteristics and applications of DC generators

The use of variable-speed generators brings the following benefits:

better energy efficiency = lower fuel consumption
less maintenance = lower maintenance costs
extended engine life

Advantages of hybrid systems with variable-speed DC gensets:

fuel savings of up to 85%
up to 75% reduction in maintenance costs
up to 300% extension of the service life of the generator set

Reduced equipment requirements:

no need for a rectifier
possibility to remove air conditioning due to heat reduction
replacement of UPS batteries with deep-cycle batteries

COELMO Generating Sets & more

Do you have any questions?

We remain at your disposal! Write to us and one of COELMO's specialists will contact you shortly.