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Bread maker

I have a 2,500 kva mastervolt Dakar Inverter with four domestic batteries. If a bread maker is listed at a max of 550w is it alright to run without engine? If I did this how long would it take to flatten the batteries? Can anybody help or recommend a bread maker.

Asked by: Robert Bush  | 5.33pm, Monday 7 February

WW says:

As your inverter is a pure sine-wave unit, it should theoretically, run the breadmaker fine. The breadmaker only uses its maximum power in batches, such as the proving cycle (where the heater is mainly off) and during the baking mode (where it is mainly on). The motor component uses around 80W.
Most breadmakers draw around 0.4KWh (or 0.4 units of electricity) for a standard bread cycle (though this is an average figure). This would, assuming 90% efficiency of inverter (and allowing for error), draw around 40amp from a 12V battery bank. Assuming that your batteries are fairly standard 110Ah units (giving a useable capacity of around 155Ah), this would use around 25% of your battery capacity per baking episode!
As long as you are cruising each day, I can't see that it would be a problem.
Just make sure that the cables linking the inverter to the battery bank are a good size (see the notes in the BSS essential guide- but around 50mm2 would be sensible, up to around 2 metres length).
Hope that helps!

Mark Langley  | 2.27PM, Tuesday 8 February

Knowing Warble boats, I would think that it is probably screwed together very well... and then some!
Let us know if you have any more questions!

Mark Langley  | 7.40PM, Tuesday 8 February

This is an interesting question!
The best way to run a small portable generator would be to input it to then 230V shorline socket.
However, larger generators really need to be permanently installed- you shouldn't, for instance, be running a petrol powered generator on the boat, even on the aft deck (due to both CO poisoning and petrol vapour leaks- which would collect in the boat).
As you already have a pure sine wave inverter this would probably be enough to power the washing machine (and you need a pure sine wave for most modern washers- often cheaper generators won't run the controllers well enough).
What you might find worthwhile is looking at a cheaper generator, and linking it to a battery charger, then using the washing machine from the inverter.
A washer uses around 1.2KWh (units) of power over the course of wash, which equates to around 100Ah of stored power from the batteries. This could easily be recovered during cruising. if you do fit a generator onboard, it would be worthwhile fitting a proper changover switch (so the consumer unit draws from either shoreline, invertor or generator, but not all of them). Alternatively, you could run a dedicated 230V feed from a cheaper generator, through a decent battery charger, to replenish the batteries.
The easiest way to deal with a washer aboard, is only run it when cruising- start it about 30min after the engine has been running, and around an hour after the end of the washer cycle, the batteries will be back to where they started.
A seperate alternator controller would make best use of the battery charging capacity of the engine, and would be both cheaper than a generator, and less annoying for others around- and avoid having to carry petrol in a seperate petrol locker (BSS requirement) and the generator in a special compartment (as it contains petrol vapour, it cannot just be stored anywhere!).
Hope that sort of makes sense!

Mark Langley  | 11.51AM, Thursday 10 February

Readers say:

Thank you will now proceed and purchase. Our boat is 8 years old and built by Warble I think all that you have said should be ok. I will check when we return to boat.

Robert Bush  | 5.34PM, Tuesday 8 February

Well I do have another question, electrics is a bit like mythology to me. If I were to buy a generator to charge the batteries or run the washing machine do I simply plug it into the shore line and switch over as if plugged into the marina? Plus what size of generator to I require if the washing machine has a max power of 2000w.

Robert Bush  | 7.24PM, Wednesday 9 February

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