Merged LiFeYPO4 1000Ah Winston prismatic cells and all electric galley...

[john61ct]

I've seen attempts at commercial versions of that.

Would be an interesting science project for sure

[BigBeakie]

Excellent contribution👍

A relatively trivial question, but which software did you use to put together your system schematic diagrams? I need to do something similar. Quickdraw, Visio ?


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[CatNewBee]

Originally Posted by BigBeakie

Excellent contribution👍

A relatively trivial question, but which software did you use to put together your system schematic diagrams? I need to do something similar. Quickdraw, Visio ?


Sent from my iPad using Cruisers Sailing Forum

The changed lagoon circuit plans are screenshots from pdf and then edited with an very old paintshop pro version, bitmap / vector overlays and saved / printed to pdf. It's doable with any painting software.

My interface plans are done by

Originally Posted by BigBeakie

Excellent contribution👍

A relatively trivial question, but which software did you use to put together your system schematic diagrams? I need to do something similar. Quickdraw, Visio ?


Sent from my iPad using Cruisers Sailing Forum

The changed lagoon circuit plans are screenshots from pdf and then edited with an very old PaintshopPro version, bitmap / vector overlays and saved / printed to pdf. It's doable with any painting software and a pdf printer driver like PrimoPDF or others.

My interface plans are done with TyniCAD, from source forge (open source).

[CatNewBee]

this one was done with tinyCAD...

[davedindubai]

CNB. On the hook we put the water heater on lunch time for an hour or so which lasts well into the evening. Don’t forget the port engine heats the tank too and you’ll run that from time to time too. Usually the 20 mins it takes us on average to anchor gives us hot water for that evening.

[CatNewBee]

Yes, that's right.

If you have to motor anyway, you'll have warm water, I am thinking about the water situation when staying for a week or so in a nice anchorage and not needing any fossile fuel for the generator or the engines.

I want to make water and heat sometimes the water without starting the generator. I know, all engins must run from time to time to prevent them from korrosion, but that is a different story.

[john61ct]

For me the watermaker noise is as irritating as a genny.

So rather than energy efficiency, I'd go for a high gallon/hr output unit - not practical to run off the bank - to minimize runtime.

Also put charge into the bank, or charge the fridge holding plate, different load opportunities on different boats.

Hot water a free bonus.

[davedindubai]

Originally Posted by john61ct

For me the watermaker noise is as irritating as a genny.

So rather than energy efficiency, I'd go for a high gallon/hr output unit - not practical to run off the bank - to minimize runtime.

Also put charge into the bank, or charge the fridge holding plate, different load opportunities on different boats.

Hot water a free bonus.

100% agree. When sailing for extended periods or on the hook without moving for a week or so (I think 7 days is about our max in any one place) we ‘want’ fresh water more than we ‘need’ electricity so we run the genny at around 5pm for an hour which gives us 120L of water, hot water AND 100% battery banks to see us thru the nights sail on auto pilot and radar etc.

If I’m going to spoil the peace and quiet, might as well make the most of it. Has to all be shut down for sunsets, gin and tonics and meal time.

[CatNewBee]

Don't forget the ice maker 4 the mojitos and frozen margharitas...

My watermaker runs on both, 220v and 12v. With the LFP and 5kVA inverter I do not see any problem to run it on any of the 2 sources, (yelds 80...100 l/h) when the bank is full. It will not suck up 15kWh that are stored in the battery. I would rather top up the water daily for an hour or so instead of emptying the 600l during the week and then refilling for 6-8h.

This also helps to not keep the LFP at full SOC for long, they like to be heavy used and cycled.

[CatNewBee]

100A charging current at 4pm. Not bad..

[CatNewBee]

On a dark rainy day only 3.2kWh, ended up with -400Ah SOC 60%), next day back to full... Charged the 400Ah plus the daily consumption (7.6kWh total).

So my calculations / sizing seem pretty ok for off-grid on solar plus LFP.

[arsenelupiga]

Originally Posted by CatNewBee

Attachment 171303
On a dark rainy day only 3.2kWh, ended up with -400Ah SOC 60%), next day back to full... Charged the 400Ah plus the daily consumption (7.6kWh total).

So my calculations / sizing seem pretty ok for off-grid on solar plus LFP.

thanks for posting that stuff. really informative.

What would be different if your solar capacity would be 1/2 of what you have now, everything else the same ?

[Eirik]

MJjyfi


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[hzcruiser]

Originally Posted by CatNewBee

Well there is a ideal solution of the differnd kind. Just buy a LFP of the half size, then use and abuse it with full charges, when it dies after 10 years, buy another one, then hopefully more reliable, smaller, lighter and cheaper than today.

That would be a different ideal, for sure. Only which battery would ever last 10 years of abuse, please? Not the ones I know...

Batteries are consumable products. Dont put too much effort to safe their life instead of using them as long as they last. (the engeneers point of view, the academic would object obviously)

They are. Yet we still want to get the most bang for the buck out of them, of course. The more expensive they are (read: LFP) the longer you want to keep them for. Hence a bit of care can go a long way rather than just "abusing" and discarding them.

[hzcruiser]

Originally Posted by Eirik

MJjyfi


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Now that's rather insightful.