Classic Dynamo Voltage Regulators
High Performance combined with Rugged Reliability

Some Questions we have been asked, and the Answers.

Question: "Does the DVR2 suit both Lucas E3L and E3LM dynamos ?"
Answer: Yes, it also works fine with the lower power E3H and E3HM versions.

Question: "Will your DVR2 suit:
             a. The Lucas MC45L dynamo fitted to my Sunbeam / Scott,
             b. A Lucas C35SD dynamo on my Ariel Square Four ?"
Answer: Yes, in both cases.

Question: "Is the DVR2 suited to the Miller dynamo fitted to my Vincent / Velocette (etcetera) ?"
Answer: Yes, as long as field is wired to earth and original cut-out removed.

Question: "Will the DVR2 suit the dynamo fitted to my MZ ?"
Answer: Yes, as long as field is wired to earth and resistor (where fitted) removed. Similar for Jawa / CZ.

Question: "What is the maximum power output of the DVR2 ?"
Answer: Maximum output is not really limited by the regulator. 75W for 6V system and 100W for 12V system is safe for the regulator.

Question: "Will I benefit from fitting a larger capacity battery ?"
Answer: No, not really helpful. Unless you must have a 12V 60W headlight in a lot of slow traffic. A discharged large capacity battery, loads the dynamo more for longer.

Question: "Will I benefit from fitting a voltmeter or voltage monitoring device ?"
Answer: Spend your cash on an ammeter that works well instead. They do not all flicker wildly all the time. A voltmeter can show a good reading for a shot battery. Monitoring charging current is the better in a dynamo system.

Question: "What voltage can I expect at the battery using the DVR2 ?"
Answer: Nominally 7.2 V in a six volt set-up and 14.1 V for twelve volts. More is definitely not better here. For example 14.5 V as commonly stated as 'correct' will mean higher trickle charge leading to more topping up and shorter life for your battery.

Question: "Will the dynamo start up with a completely flat battery ?"
Answer: Yes, the DVR2 will start with a very low battery. If fully discharged it will wake up with battery disconnected (magneto ignition assumed!). Regulation will not be as good as in normal use, but a useful get you home measure after dark.

Question: "Wouldn't I be better off installing a modern (expensive) alternator alternative ?"
Answer: A matter of taste perhaps. But unarguably the Lucas dynamo (for example) can be a very reliable unit, requiring only minimal maintenance. It is evident that modern generating replacements have significant reliability issues, and that low speed output may not be that much better than with the old technology.

Please mail any questions to dvr@dynamoregulators.com or call 01489 880552.

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