Cole Hersee Battery Isolarors Cat No: MT-COLE

Cole Hersee Battery Isolators are important safeguards for multiple circuit battery electrical systems. Many DC electrical systems have more than one battery connected to one or two alternators. The most common system consists of two batteries and one alternator. This type of system can be found in: Ambulances Boats Fire Trucks Tow Trucks Police and Emergency Vehicles Vans & Service Vehicles Buses Snow Plows Motor homes and Trailers Salt & Sand Spreaders How a typical system operates. When two batteries supplying separate circuits are connected to a single alternator, the primary battery is usually connected to the engine starting system with the auxiliary battery connected to other electrically powered equipment. The auxiliary equipment could be emergency lights, refrigeration, a motor home or trailer electrical system, pumps, lifts or life support equipment in ambulances. When the engine and alternator are operating, there is enough power to supply the electrical equipment and keep both batteries charged. When the engine and alternator are not operating, the auxiliary battery is supplying the power to operate the equipment. But, since the batteries are connected, the primary battery is being drained as the auxiliary battery uses its charge. The batteries tend to act like fluid reservoirs, keeping an equal charge level. As a result, the primary battery could drain to the point where it would not start the engine when required. Why a battery isolator should be used. A battery isolator is an electronic device that solves the problem of the primary battery being drained by the auxiliary battery. The isolator places diodes in the lines which connect each battery to the alternator. Since a diode permits current to flow in only one direction, current can flow into each battery for charging. The diode will not allow the current to flow back o~~t of the batteries, so current from the battery with the higher charge cannot flow into the battery with the lower charge. The battery isolator protects the charge in the primary battery so it will be able to operate the engine starting system. When the alternator is operating, the battery isolator allows the charging current to flow into the battery with the lower charge. Selecting a Battery Isolator. The battery isolator is selected by its alternator rating and matched with the rating of the alternator to which it will be connected. If the ratings are not the same, select the next higher rated isolator. The isolator also has a per leg rating indicating the maximum current it can deliver to each battery system. Part No. Alternator Rating Per Leg Rating Number of Legs MT-48080 42 amps 40 amps 2 MT-48070 70 amps 70 amps 2 MT-48090 90 amps 90 amps 2 MT-48120 140 amps 150 amps 2 MT-48160 200 amps 200 amps 2 MT-48161 250 amps 225amps 2 Delcoltran CD Series MT-48122 140 amps 150 amps 2 Amps: 43 Amp Alt., MT-48080 : $55.00 70 Amp Alt., MT-48070 : $59.40 90 Amp Atl., MT-48090 : $66.00 140 amp Alt., MT-48120 : $83.60 200 Amp Alt., MT-48160 : $100.00 250 Amp Alt., Mt-48161 : $257.40 140 amps Alt MT-48122 : $117.70