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| Plug-in hybrid-electric drive ... for your boat! |
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Components / generator |
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Our generator is manufactured to E motion specifications by Polar Marine. It produces direct current at144 volts - not alternating current like most marine generators - and recharges the battery bank directly.
When battery voltage in the main bank declines to a pre-set level, the generator automatically starts up to recharge them. The boat can continue motoring as the generator brings the batteries up to full charge. When the batteries are fully charged, the generator automatically shuts off.
A controller on the generator monitors current going into the battery bank and current going out to the load. |
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Besides automatic start and stop, the controller provides
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- A trickle charge safety test for shorted batteries
- A bulk charge rapid charge capability
- An equalizer charge for battery conditioning for longer life.
- A float charge for battery maintenance while accessories are operated
- Charge shutdown on sensing battery over-temperature
- Remote battery voltage sensing.
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The Polar DC generator is powered by a Volvo Penta series D1 or D2 diesel engine, depending on kw output. The engine turns an alternator that produces electricity.
All alternators create alternating current in the stator windings. But in a DC generator, a series of diodes – one-way pathways for electricity - convert the AC into DC. The diodes are mounted separately, on a large heat sink away from the alternator, to protect them from heat.
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The alternator width in cross section (left) varies in three increments for increasing output ranges up to 32 kw.
Like our propulsion motors, the rotor consists of a ring of neodymium-iron-boron permanent magnets.
The alternator stator is held in place by a yoke that fastens to the engine bell housing. The alternator rotor is attached to the flywheel.
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DC-6-A |
DC-10-A |
DC-15-A |
DC-22-A |
DC-32-A |
| kw output (cont. 24 hrs) |
6.5 |
10 |
15 |
22 |
32 |
| Volvo Penta engine model # |
D1-13 |
D1-20 |
D1-30 |
D2-40 |
D2-55 |
| # cylinders |
2 |
3 |
3 |
4 |
4 |
| rpm (max) |
3200 |
3200 |
3200 |
3200 |
3000 |
| rpm (cont. 24 hrs) |
2700 |
2700 |
2700 |
2700 |
2500 |
| weight lb. (kg) [excl. cover] |
302 (137) |
353 (160) |
379 (172) |
430 (195) |
684 (265) |
| length - in. (mm) |
23.6 (600) |
24.8 (630) |
26.2 (665) |
29.6 (751) |
35.4 (900) |
| width - in. (mm) |
18.7 (476) |
18.5 (471) |
19.0 (482) |
19.0 (482) |
20.5 (520) |
| height - in. (mm) |
20.4 (518) |
21.1 (535) |
21.3 (541) |
22.6 (575) |
32.7 (830) |
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