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Pepperman



Joined: 10 Oct 2010
Posts: 759

PostPosted: Wed Apr 26, 2017 4:37 pm    Post subject: Reply with quote

Just reading around and it seems that some / many / most (no idea which) induction hobs are fitted with power factor correction. It's not the kind of thing that's generally published in the sales brochure so best clarify with the manufacturer before specifying it.
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adam2
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Joined: 02 Jul 2007
Posts: 6206
Location: North Somerset

PostPosted: Wed May 10, 2017 9:45 am    Post subject: Reply with quote

Regarding lighting, if you wish a 48 volt battery but a lower voltage for lighting, and would prefer to avoid the complication of a 3 wire DC system, it might be worth considering running the lighting at 12 or 24 volts DC from a DC/DC converter.
This has some of the drawbacks of an inverter in that extra losses and another point of failure are introduced.

OTOH, DC/DC converters are now much reduced in price and improved in efficiency.
The lighting load could be divided between two converters so as to avoid a total blackout if one fails. Keeping a spare or two would be very affordable.

12 volts is more viable since the converter may be situated close to the centre of the load. The converter limits the fault current so cheap automotive fuses may be used for the lighting circuits.
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clv101
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Joined: 24 Nov 2005
Posts: 7630

PostPosted: Wed May 10, 2017 11:43 am    Post subject: Reply with quote

I'm going for 24V DC lighting, using a DC-DC converter:
https://www.victronenergy.com/dc-dc-converters/orion-dc-dc-converters-isolated-12v-24v-48v-100v
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adam2
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Joined: 02 Jul 2007
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Location: North Somerset

PostPosted: Wed May 10, 2017 12:09 pm    Post subject: Reply with quote

Sounds good.
Just in case the converter fails it might be worth installing a handful of lamps in key locations that are powered direct* from the battery.

As these wont be regularly used, low efficiency is fine and incandescent lamps may be used. Just 6 lamps in key locations, each 40 watts would be ample for emergency lighting.
Incandescent lamps supplied direct* from the battery should still work after an EMP event that has killed anything more sophisticated.

*via a fuse of course.
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adam2
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Location: North Somerset

PostPosted: Tue Oct 03, 2017 2:33 pm    Post subject: Reply with quote

I have just received information on the latest multi voltage LED lamps.

7 watt, warm white, and said to be suitable for "12, volt, 24 volt, 48 volt and 60 volt systems"
Should also be suited for other voltages within that range such as 16 volts or 32 volts.

Rather expensive at over £20 each, but will probably become cheaper in time.

Available from international lamps. This is the first time that I have seen these stocked by a major and well known wholesaler, rather than by obscure internet based outlets.
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clv101
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PostPosted: Tue Oct 03, 2017 7:22 pm    Post subject: Reply with quote

I bought a few (24VDC E27) from eBay that ALL (4 from three different sellers) wen't what they claimed, lower wattage. Only ~£2. Gave refunds.

Second batch from AliExpress which seem closer to their claimed output but haven't tested them in detail yet. ~£3-4.
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