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Post by Deleted on Dec 9, 2016 16:19:14 GMT
I'm helping to design a charity trip boat and I'm looking at the electrical system.
One scenario is that the batteries will be discharged by about 180Ah and the boat will have a 2 1/2hr run back to Base. Do we have a hope of getting them fully recharged in that space of time given a large enough alternator ? I'm assuming sealed lead acid leisure batteries of about 500Ah capacity.
If not what do folks think the max recharge to fully charged one achieve in 2 1/2 hrs is?
Thanks Top Cat
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Post by Deleted on Dec 9, 2016 16:44:36 GMT
Any chance of getting an electric supply st the base mooring?
If not perhaps it'd be worth investing in some solar. It seems to be pretty cheap these days.
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Post by Ditchcrawler on Dec 9, 2016 16:45:55 GMT
I'm helping to design a charity trip boat and I'm looking at the electrical system. One scenario is that the batteries will be discharged by about 180Ah and the boat will have a 2 1/2hr run back to Base. Do we have a hope of getting them fully recharged in that space of time given a large enough alternator ? I'm assuming sealed lead acid leisure batteries of about 500Ah capacity. If not what do folks think the max recharge to fully charged one achieve in 2 1/2 hrs is? Thanks Top Cat Is it a hybrid ? |
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Post by Deleted on Dec 9, 2016 16:56:35 GMT
A small one?
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Post by peterboat on Dec 9, 2016 17:03:01 GMT
First put proper batteries on it 2 volt cells full traction they can cope better with being discharged more.
Second fit solar as well its cheap.
Third leisure battery alternator wants to be 160 - 175 amp which should achieve what you want
Fourth fit a watering system to the batteries, do you really want to try to fill batteries with water in a dark engine bay?
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Post by Mr Stabby on Dec 9, 2016 17:09:30 GMT
If there is one thing I would love to do as an occupation, it would be taking disabled people out on a charity trip boat, it's heart-melting to see a group of young people with health difficulties having a day out on (say) a Lyneal Trust boat.
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Post by tonyqj on Dec 9, 2016 17:28:04 GMT
TC, no, they won't be recharged in 2.5 hours whatever size of alternator you fit. The battery chemistry simply won't allow that to happen.
Will the engine be running throughout the trip? If so then why will you have drawn anything from the batteries? Couldn't all the usage be covered by the alternator? What's consuming the 180Ah?
Answer me that and we can help a bit more.
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Post by Deleted on Dec 9, 2016 17:35:27 GMT
The big draw is the proposed 3Kw water heater that dominates the usage. I assumed that during the 1.5 hr lunch stop it would run for half an hour. The other big user would be a combi microwave and grill .
As we have volanteer crews we have got to make it foolproof and assume people wont be abstemious with power.
I'm starting to come to the conclusion that we will have to wire it so the heater and microwave can only be powered by the travel power unit on the engine.
Other suggestions welcome.
And yes taking people out on tbe trip boat is the most rewarding boating I have ever done, I have been privelaged to meet some wonderful people.
Top Cat
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Post by Mr Stabby on Dec 9, 2016 17:44:03 GMT
The big draw is the proposed 3Kw water heater that dominates the usage. Surely the bulk of the hot water could be provided by the engine cooling system? |
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Post by tonyqj on Dec 9, 2016 17:44:14 GMT
I think that by far the easiest solution would be to wire the heater and MW from the TP. The alternative would require either shore power or solar (the latter not being much use in winter).
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Post by tonyqj on Dec 9, 2016 17:45:00 GMT
The big draw is the proposed 3Kw water heater that dominates the usage. Surely the bulk of the hot water could be provided by the engine cooling system? I'm guessing we're talking "Tea urn" here. |
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Post by Mr Stabby on Dec 9, 2016 17:51:17 GMT
Surely the bulk of the hot water could be provided by the engine cooling system? I'm guessing we're talking "Tea urn" here. Maybe, but assuming the boat cruises in the morning and then stops for lunch, a tea urn could be brought up to temperature using an inverter while the engine is running? I can't see any way in which batteries could be used to heat a large quantity of water to boiling point unless you had a U-boat type bank of them. |
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Post by tonyqj on Dec 9, 2016 18:15:42 GMT
I'm guessing we're talking "Tea urn" here. Maybe, but assuming the boat cruises in the morning and then stops for lunch, a tea urn could be brought up to temperature using an inverter while the engine is running? I can't see any way in which batteries could be used to heat a large quantity of water to boiling point unless you had a U-boat type bank of them. Well no. TC's estimate is about right. A 3kW element on for 30 minutes will heat the water pretty well, and will use 120Ah from a 12V bank but it'll be hammering the batteries. Much better to use the TP. |
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Post by Deleted on Dec 9, 2016 18:15:57 GMT
Might be an argument for a seperate 230v diesel generator on this boat I think.
Also handy for proper external lighting if it is to be used in winter.
Put in something sensible like 8kw.
I do realise this is costly.
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Post by Deleted on Dec 9, 2016 18:52:37 GMT
Thanks for the inputs guys.
Yes I'm expecting the urn to heat up while the engine is running it's the lunch break I'm trying to manage. We are trying to go for a go free boat if practical but need to be able to provide up to 12 cups of tea at short notice.
I have been wondering about filling the urn from water heated by the engine but am concerned that there might be health issues with that, as we have vulnerable people.
The current boat has a separate generator but I was hoping to get away from that in order to keep things simple.
At the moment we do have access to mains hook up back at Base but as we are planning for the long term we can't bank on always having it. I like solar and use it on my own boat, trouble is I don't think we can rely on it every day, we go out in all weathers, but only from April to November. My calculations indicated that in ideal conditions we would only get 10Ah per 100w in the 1 1/2 hrs is that anywhere near right.
So if we have a 2 hrs run after lunch what's the most we can take out and get the batteries recharged?
Top Cat
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