Battery Types
Deep-Cycle Batteries
Deep-cycle batteries are designed for deep discharge service where they will be repeatedly discharged and recharged. They are marketed for use in recreational vehicles, boats, and electric golf carts—so you may see them referred to as RV batteries, marine batteries, or golf cart batteries.
For most applications of the XM 1800, Xantrex recommends that you use one or more deep-cycle batteries that are separated from the vehicle’s starting battery by a battery isolator.
A battery isolator is a solid-state electronic circuit that allows equipment to be operated from an auxiliary battery without danger of discharging the vehicle’s starting battery. During vehicle operation, the battery isolator automatically directs the charge from the alternator to the battery requiring the charge. Figure 3-1, “DC Input Configuration for Normal Loads” on page 3–2 and Figure 3-2, “DC Input Configuration for Heavy Loads” on page 3–3 show a battery isolator in configurations for normal and heavy-duty loads.
Battery isolators are available at marine and RV dealers and most auto parts stores.
Battery Size
CAUTION
The XM 1800 must only be connected to batteries with a nominal output voltage of 12 volts. The XM 1800 will not operate from a 6 volt battery and will be damaged if connected to a 24 volt battery.
Battery size or capacity is as important as the battery type for efficient operation of your loads. Xantrex recommends that you purchase as much battery capacity as possible.
A number of different standards are used to rate battery energy storage capacity. Automotive starting batteries are normally rated in cranking amps. This is not a relevant rating for continuous loads like an inverter. Deep-cycle batteries use a more suitable rating system, either “amp- hours” (“Ah”) or “reserve capacity” in minutes.
