We design, manufacture and sell direct current, or DC, power systems for applications primarily in the telecommunications market and, to a lesser extent, in other markets, including military, electric vehicle charging, cogeneration, distributed power and uninterruptable power supply. Within the telecommunications market, our systems provide reliable and low-cost energy for applications that do not have access to the utility grid or have critical power needs and cannot be without power in the event of utility grid failure. Within this market, we offer three configurations of our DC power systems, with output power ranging from 5 kW to 20 kW and with three possible sources of fuel: diesel, natural gas and liquid petroleum gas.
Our DC base power systems integrate our DC generator with automated controls that are programmed to efficiently charge various battery chemistries to provide backup energy during a power failure. In addition, these systems are also used to provide prime power in off-grid and bad-grid locations in telecommunications towers. Substantially all of our net sales are derived from sales of our DC base power systems to Tier-1 wireless telecommunications tower companies in the U.S.
Our DC hybrid power systems combine our DC base power systems with lithium-ion batteries (or other advanced battery chemistries) to efficiently store energy from DC generator or grid systems to provide back-up power or prime power. Our DC hybrid power system replaces lead acid systems with longer-life and higher efficiency lithium-ion batteries equipped with our proprietary battery management system, or BMS, which protects batteries from being over charged or over discharged during daily use.