12 volt power supply and DC UPS for use in cars with 10A pass through		12 volt DC UPS module keeps 12 volt equipment alive in cars and taxis using an external sealed lead acid battery.
			Click here for the 3 amp version
			Click here for the 24V 10A car UPS controller
			Click here for 5 amp version with status output
	Superbly Engineered Products, Retail, Wholesale, and Custom Designed!   This is what the circuit board looks like inside the fully potted module.  This is the big brother of the PST-DC-UPS-1212. It allows equipment in cars to run under battery backup with up to 10 amps, 120 watts nominal. In addition it charges the auxiliary battery at up to 1.5 amps. The features are as follows: First it allows you to safely charge an external lead acid battery from the car electrical bus by isolating and current regulating the connection to the auxiliary battery. Second it isolates the extra battery from the car so it won't be discharged by the car electronics, and it won't try to participate in starting the car. Third it powers your equipment in the car using the car electrical system, but switches to external battery power when the car's battery is removed, stolen, or drops below a predetermined voltage. Fourth, it prevents the external battery from being overdischarged, keeping it from being damaged. Fifth, it prevents your equipment from running the car's battery down so the car can't be started. In one configuration it cuts off the car's battery when the voltage gets below 13.1 volts, then switches over to the external battery, in other words, it switches over to the auxiliary battery when the engine is shut off and the alternator stops. In another configuration the crossover voltage is lower, say 12.0 volts. This allows your equipment to run off the car's battery but cut off while the car's main battery still has enough power to safely start the engine. Sixth, it prevents your equipment from losing power while the vehicle is cranking the starting motor. To solve these problems we invented this charging board. The idea is that you can connect the module to the car's electrical bus and it will charge an external 12 volt lead acid battery of your choice. Your equipment, which can be a small computer, telemetry equipment, or a car alarm, is connected to the module. This equipment runs off the automobile's electrical bus until the voltage of the bus drops below a preset voltage, the "N" voltage (from 13.1 to 11.9 volts, depending on your needs). Then the external battery takes over. When the external battery drops below the "P" preset voltage (Between 10 volts and 3 volts depending on your requirements) the power is cut off to either prevent damage to the external battery or to run your equipment as long as possible. This uninterruptible power supply control module is specifically designed to withstand the harsh electrical and temperature requirements of automotive equipment including spike, dropouts, load dumps, jump-starting, high and low temperatures. Detailed Specifications PST-DC-UPS-1212-10A Max Charge Current 1.5 Amps. Temperature dependence of charge current The charge current is reduced at higher temperatures to maintain reliable heat management. At 40°C the charge current limit is 850 mA Maximum pass-through current 10 amps (15 amps available special order) Also comes in a 3 amp version, click here Transient pass-through current 13A for 10 seconds 18A for 1 second limitation is the 10A in-line fuse Maximum input voltage (steady state) 15V Maximum input voltage (transient) 22V, protection is provided for transients above 22 volts using internal TVS diodes. Maximum pass-through wattage 120 watts (180 Watts on special order) Transition time less than 300 microseconds from main battery to auxiliary battery less than 160 microseconds from auxiliary battery to main battery Charge voltage The charging circuit is current limited, so the charge voltage can vary depending on the state of charge of the battery. The maximum charge voltage is 0.5 volts less than the car's bus voltage. The car bus' voltage must be higher than 13.4 volts to charge the auxiliary battery. The maximum car bus voltage is 15 volts. Type of battery charged Lead acid, VRLA, SLA, etc. Charge algorithm Constant current until the battery voltage reaches 13.4 volts, taper charge above 13.4 volts to zero current at 14.1 volts Nominal Battery Voltage 12 Volts Battery Capacity 1 to 33+ Amp-Hours (larger batteries may be used but they may take a long time to charge) Size of module 89 x 94 11mm 3.5x3.7x0.45 inches External battery connects when the input voltage to the module drops below 13.6 to 12.9 volts, see suffixes below External battery is disconnected from the load when the external battery's voltage drops below 12.9 to 6 volts, see suffixes below Temperature Range Minimum ambient temperature -10°C (-40°C available upon request) Maximum ambient temperature of 70°C When the case temperature gets above 45°C the charge current is automatically reduced to maintain system operation at higher temperatures. Storage Temperature -10°C to 100°C (-40°C available upon request) Connection 6 Faston spade terminals, clearly labeled 3 Ground terminals External battery positive Load positive Car positive Weight 140 gms or 4.9 ounces PDF Data sheet Click here for the PDF data sheet Installation Instructions Click here for the PDF installation sheet Ordering See the shopping cart below The PST-DC-UPS-1212-10A can be ordered with a range of "N" and "P" values, as explained in the following table. Suffixes* Voltage at which car battery is cut of from the load Voltage at which auxiliary battery is cut off from the load Why? N13.1 (most common choice) 13.1 ±0.2 volts   Load is disconnected from the car electrical bus when the ignition is switched off N12.9 12.9 ±0.2 volts     N12.8 12.8 ±0.2 volts     N 12.7 12.7 ±0.2 volts     N12.6 12.6 ±0.2 volts     N12.0 12.0 ±0.2 volts     N11.9 11.9 +0.1 -0 volts   Allows the load to be powered by the car battery most of the time but still start the car (barely). N?? Tell us what you need, the range is between 9.0 volts and 11.9 volts. The tolerance is ±0.2 volts     P10 (most common choice)   10 volts When deep cycling of the auxiliary battery is desired. P3   6 volts When longest possible system operation is desired regardless of loss of auxiliary battery cycle life. P??   Tell us what you need, the range is between 12.9 volts and 6 volts   Tolerance Tolerance for N values is ±2.5% Tolerance for P values is ±2.5%   **(For example PST-DC-UPS-1212-10A-N13.1-P10 would be a module which disconnects from the car battery when the car voltage falls lower than 13.1 volts and turns the auxiliary battery off when it falls to 10 volts) Model Please allow up to 5 days for small orders, 45 days for large orders. Price for quantity 1-49 Price for quantity 50-99 Quantity 100-499 Quantity 500-1999 PST-DC-UPS-1212-10A-N13.1-P10 $82.00 $70.50 $60 $48 PST-DC-UPS-1212-10A-N11.8-P10 $82.00 $70.50 $60 $48 PST-DC-UPS-1212-10A-Nxx-Pyy (xx is your choice between 9 and 13.1 volts yy is your choice between 12.9 and 6 volts) Delivery time for samples of the custom voltages can take up to two weeks. $82.00 $70.50 $60 $48 DIN Rail mounting kit (see below) $6.00 $4.20 $3.80 $2.95 In-line fuse kit, consists of 3 in-line automotive spade fuse holders for the car+, battery+ and load+ lines. Includes 10 amp fuses. $22.00 $18.30 $15.90 $14.25 Hook up diagram: Connection diagram Dimensions, click on drawing for larger view DIN rail mounting option (shown here on the 3 amp version of the DC UPS) Questions and Answers 1. Q:My application needs more than 10 amps pass-through current, what can I do? A: Call and let us know your requirements. 2. Q: When the module turns off because both batteries are below their setpoints when does the module turn back on? A: The module turns back whenever the main battery or auxiliary battery is greater than their N or P values (this is an improvement over the 3 amp UPS module which turns on only when the car exceeds its N value). 3. Q: What do you have for 24 volt systems? A: Use the 24 volt version of the 10 Amp backup module which will use 24 volt auxiliary batteries in a 24 volt vehicle. 4. Q: What is the recommended fusing? A: If you fuze both the input positive and auxiliary battery positive with a 10 amp fast blow fuse the module will be protected from reverse polarity and short circuit conditions. In addition, if the load can source current it should have a 10 amp fast acting fuse as well. 5. Q: I need a signal to tell me what the status of the UPS, whether it is on the main circuit, the auxiliary battery, or turned off. A: Consider using the PST-DC-UPS-1212-5A, which signals the UPS status by sourcing 300 mA at 12V to run LEDs, relays, etc. To order, please call 801-764-9060, 9062, 9063, or 9064, FAX to 801-764-9061, or use our shopping cart. You can cancel your order any time before you submit your payment. Wholesale, manufacturer's and OEM pricing available. Custom modifications at low cost.

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