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Shop built roller starter
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<blockquote data-quote="Magnetoman" data-source="post: 111618" data-attributes="member: 2806"><p>For what it's worth, I haven't started a Vincent on them but my DocZ rollers with two Ford starter motors draws a measured 480 A so ~7.7 h.p. If it takes a while to start the power would drop by 15% (to 6.6 h.p.) after 15 sec. and by 30% (to 5.4 h.p.) after 30 sec. This when using a marine MCA845 deep discharge battery. What may be more relevant is a significant amount of power was lost in the original cables and clamps so I upgraded both.</p><p>[ATTACH=full]29407[/ATTACH]</p><p>I bought welding clamps as replacements and modified them with ~1 sq.in. Cu pads to make contact with the Cu electrodes I made to bolt to the battery. The resistance of those connectors is now only 0.22 mΩ each. Although with 500 A through them the voltage drop at each clamp is now only ~0.1 V that's still 55 W of heat each. Each of the 2 AWG cables that came on the rollers had 6x that much loss (1.36 mΩ), which I reduced to 0.86 mΩ by replacing them with 1/0 AWG. Still the losses in both of the connectors and cables account for ~10% of the total power supplied by the battery. Such is the nature of high currents. However, before these upgrades to the circuit the losses were over 2x as much so only ~80% of the available power got to the motors, with the rest helping to melt the polar icecaps.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 111618, member: 2806"] For what it's worth, I haven't started a Vincent on them but my DocZ rollers with two Ford starter motors draws a measured 480 A so ~7.7 h.p. If it takes a while to start the power would drop by 15% (to 6.6 h.p.) after 15 sec. and by 30% (to 5.4 h.p.) after 30 sec. This when using a marine MCA845 deep discharge battery. What may be more relevant is a significant amount of power was lost in the original cables and clamps so I upgraded both. [ATTACH type="full" alt="DocZ_connector.jpg"]29407[/ATTACH] I bought welding clamps as replacements and modified them with ~1 sq.in. Cu pads to make contact with the Cu electrodes I made to bolt to the battery. The resistance of those connectors is now only 0.22 mΩ each. Although with 500 A through them the voltage drop at each clamp is now only ~0.1 V that's still 55 W of heat each. Each of the 2 AWG cables that came on the rollers had 6x that much loss (1.36 mΩ), which I reduced to 0.86 mΩ by replacing them with 1/0 AWG. Still the losses in both of the connectors and cables account for ~10% of the total power supplied by the battery. Such is the nature of high currents. However, before these upgrades to the circuit the losses were over 2x as much so only ~80% of the available power got to the motors, with the rest helping to melt the polar icecaps. [/QUOTE]
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