This high current switch is designed for battery switching in boats but can be used in land-based units. It permits selection between one of two batteries or the connection of both batteries in parallel. The "off" position also acts as a battery disconnect.

Many people are using these to choose between two banks of batteries or between a main battery and a back-up battery. The switch surface mounts with a slot for wires to enter from the bottom. Wires connect to 5/16" brass bolts.

Capacity is 250 amps continuous and 360 amps intermittent.

For use on 6, 12, 24 or 32 volt systems.

UL listed for marine use.

Description	Item SKU Number	Price	Purchase
Battery Selector Switch	053-08267	$32

Water Misers are molded plastic "flip-top" vent caps designed to reduce and ease maintenance on flooded Lead-Acid batteries. There is no need to remove the caps when charging, filling, or equalizing the batteries. When charging, the plastic pellets capture up to 90% of the moisture and acid droplets. This reduces acid fumes, corrosion, and keeping the battery tops much cleaner and dryer. Excess water is dropped back into the battery cell. Water loss is reduced, which extends time between watering.

These caps fit the batteries on this page as well as all batteries with standard caps.

Description	Item SKU Number	Price	Purchase
Water Miser Battery Cap	040-09913	$8.50

1 year warranty.

BLS-12-A is for use on vehicles that are used frequently and have one or two batteries. Also for use with a battery bank that operates at 12 volts. Runs constantly to keep the battery in optimum condition. Can also be used for battery storage in conjunction with a Float charger. Comes with eye rings for attachment to the battery clamp bolts.

BLS-12/24-B is a higher powered version of BLS-12-A. For use with a battery charger to rejuvenate unuseable batteries. Works faster than BLS-12/24-A. Comes with plier type battery clips.

BLS-12/24-C is for use on heavy trucks and other vehicles and systems with multiple batteries. Runs constantly to keep batteries in optimum condition. Comes with 5/16 lugs for attachment to the battery clamp bolts. Return to home page.

BLS-36-A is a 36 volt version for use with battery powered vehicles. Can be mounted on the vehicle to constantly keep the batteries in optimum condition or can be used in conjunction with a battery charger. Comes with 3/8 lugs for attachment to the battery terminals.

BLS-48-A is a 48 volt version for use with battery powered vehicles and for battery banks that operate at 48 volts. Can be mounted on the vehicle to constantly keep the batteries in optimum condition or can be used in conjunction with a battery charger. Comes with 3/8 lugs for attachment to the battery terminals.

Lead-acid batteries produce hydrogen gas when charging. But if the battery box is left open to vent gas in cold climates, the batteries get too cold and battery capacity is significantly reduced. A vent that solves this problem is especially important when battery boxes are placed in basements, garages and sheds. When heat rises in the structure, a low pressure area forms around the box, cool air flows into the box and gasses vent into the structure. The Power Vent controls battery box venting, removing hydrogen gas while reducing cold air infiltration into the box.

The Power Vent contains a gravity-operated damper that normally stays closed. When connected to a voltage controlled relay the fan operates only when the batteries are being charged and blows gas vapors out.

Designed for battery banks under 2200 AH and charge rates under 125 amps. Fan can be operated from the aux relay on a Xantrex SW inverter, from the auxiliary relay of an Outback FX inverter (use 12v fan for all Outback inverter voltages) or by a voltage controlled switch (sold separately on page 53.) The 12/24 volt unit uses 3 watts and pushes air at 6 cfm with a 360° maximum change of direction. Dimensions: 4" diameter x 7.25" with a 2" PVC pipe socket on the inlet and outlet. The 48 volt unit uses 6 watts and pushes 8 cfm with a 360° maximum change of direction.

Dimensions: 4" diameter x 10" with a 2" PVC pipe socket on the inlet and outlet.

Reads actual specific gravity for accurate measurement of battery state of charge.  Variation of .20 or greater specific gravity between battery cells indicates a need for battery equalization charging or a weak cell.