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DC/DC Converter

An electric car still uses a 12 volt system to power all of the original 12 volt accessories: lights, horn, etc. This may also power some control circuits for the electric drive system. However, unlike a gas car, there is no alternator to keep this battery charged. One option in the early days of EVs was to use a deep cycle 12 volt battery, as heavy duty as possible, and recharge it when you charge the main battery pack. This is not adequate if any amount of night driving is intended. As the battery drains in use, the headlights will grow dimmer and the turn signals flash more slowly. It can also effect the running of the car if some of the drive system components do not get the 12 volt signal they require.

It would seem to be simple to tap 12 volt from one or two of the main pack batteries. This is not recommended, because it will cause the pack to discharge unevenly, affecting performance and battery life. It also violates the isolation of the traction pack from the chassis, which is required by some components, and necessary for safety.

The solution is a DC/DC convertor. This taps the full battery pack voltage and cuts it down to a regulated output, similar to that from an alternator. By tapping the full pack, there is no uneven discharge. Amperage required is so low that there is little effect on range. Isolation of the high and low voltage systems is maintained inside the DC/DC converter. This also eliminates the need for a separate 12 volt charging circuit for an auxiliary battery.

Sevcon DC/DC Converter

The Sevcon is suitable for use with our low to medium voltage (96V-144V) DC drive systems. It is intended to be used in conjunction WITH a 12V accessory battery. However, since the battery is not being asked to start a gas engine, a much smaller 12V starting type battery than the car's original can be used.

Features

• Double isolation of power components for safety
• Reverse polarity protection
• Overload protection
• Short circuit protection
• Transient protection
• Inaudible operation
• Robust construction
• UL approved

Specifications

Solectria DCDC750 The Solectria DCDC750 is suitable for use with our medium to high voltage (144V - 312V) AC drive systems. Except for the DCDC750-BC model, it is designed to be used WITHOUT a 12V accessory battery. The DCDC750-BC model comes with the fan included, while the fan is a separate option on the other models.	Solectria DCDC750 Converter
Features Sealed, Solid State Construction High Efficiency Heatsink Thermal Protection Range Of Factory-Set Input & Output Voltages Available Automatic Shutdown for Over-Current or Output Over-Voltage Low "Idle" Power use High Power-To-Weight & Power-To-Volume Ratios Optional 100 cfm Cooling Fan With Mounting Brackets Available Note: Fan must be installed by Solectria or warranty is void	Solectria DCDC750-BC Converter

Specifications

Physical
Model	Length	Width	Depth	Weight
All Except DCDC750-400/12BC	13.0"	7.4"	2.8"	6.8 lbs.
DCDC750-400/12BC	13.0"	7.3"	4.3"	7.8 lbs.

Operating
Model	Input Voltage	Output Voltage	Output Current	Output Watts	Efficiency	Operating Temperature
DCDC750- 200/12	100 V - 200 V	12.0 V Regulated	63 A Max.	750 W Cont.	85 - 90%	-40° C to +85 ° C
DCDC750- 250/13.2	150 V - 250 V	13.2 V Regulated
DCDC750- 400/12	200 V - 400 V	12.0 V Regulated
DCDC750- 400/13.2	200 V - 400 V	13.2 V Regulated
DCDC750- 400/12BC	200 V - 400 V	13.5 V Regulated	58 A Max.	750 W Cont.	85 - 90%	-45° C to +85 ° C

Returns accepted for warranty issues ONLY, for replacement. No cash refunds.
For ordering and warranty information, see the Order Info page.

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