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Old 28 December 2009, 08:29   #11
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I don't know for sure but would also expect there may be spikes way above that.
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Old 28 December 2009, 08:33   #12
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I don't know for sure but would also expect there may be spikes way above that.
It wouldn't surprise me at all-the 24v was from the display on the GPS which faded out a couple of times.
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Old 28 December 2009, 16:22   #13
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This is the plotter i'm planning to install:

" http://www.ronhalemarine.co.uk/super..._Explorer_550i "

The unit will accept 10.5 to 32 V DC (think that's for a reason...) so voltage is maybe in this case not that big concerne.

Still slightly worried about the high current the charger is delivering. I was planning to keep the battery in the bow box, thus the wires will be aprox 4-5 m. If using only 2,5mm2 cable, that might also add resistance, but will it inpact on the voltage or the current?

As you can see from my post's I'm far from an electrician, sorry for that.
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Old 30 December 2009, 05:10   #14
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There is some good information on the potential hazards of high charging voltage here:

Charging Voltage

To add my 0.02 worth:

1. With a rectifier only (no battery or regulator) the voltage will vary considerably with outboard revs and load, potentially above 32 VDC. In particular if you switch devices on and off (eg lights), the other devices will see voltage spikes. You may well also see your lights brighten and dim as the voltage varies - not ideal.

2. With a rectifier and battery but no regulator you run the risk of overcharging the battery leading to hazardous gassing.

3. With a rectifier and regulator and no battery, you will get a reasonably stable voltage however outboard regulators tend to rely on the battery to act as a damper and provides a load. It is possible to fry a regulator by running with no load.

4. Cheaper options than the outboard manufacturer's regulator exist, however if you are not particularly experienced with electrics and electronics buying the OB manufacturer's unit will save you time and effort.

5. 2.5mm2 cable should be more than ample over that cable run length.

Cheers

Chris
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Old 30 December 2009, 14:34   #15
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Thanks, will try to stay away from overcharging.

Must check if i can get a suitable voltage rectifier complete with regulator from Electrex or another source, as the OB manufacturer's unit does not include a regulator.

Another option is that i run the running lights directly from the engine(did so in the past on a Johnson 20 with direct AC from the engine using 24 v bulbs without any problems) and having a separate MC battery(or power bank) for the plotter, charged at home. The plotter uses only aprox 0,5 amps so a 12 amp battery will last pretty long time. However, this is not an optimal sollution, will forget to charge the battery sooner or later.
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