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

[noelex 77]

Originally Posted by Simi 60

For sure, but I don't usually want a cooked meal for lunch in summer
And the sun doesn't work at dinner time or early am.

Providing the solar output is greater than your consumption you can use electric cooking any time of day and make good use of this excess power. You don’t have to use the excess power at the exact time it is produced. The battery bank has plenty of reserve to average the difference in production between night and day.

At this time of year our solar panels produce way more power than we can use. It is better to use this excess electric power for cooking or to boil water than to use propane (or diesel) for this purpose.

Propane in particular is a hassle. As we are travelling between different countries, this involves finding and transporting replacement bottles, which can be difficult especially in remote areas without a car. Utilising electric (and diesel) cooking and water heating together with plenty of ventilated storage extends the propane duration so that replacement bottles are only needed every few years. The various options provide valuable redundancy without the complications of a generator.

[T1 Terry]

Originally Posted by Simi 60

For sure, but I don't usually want a cooked meal for lunch in summer
And the sun doesn't work at dinner time or early am.

This is part of determining the battery capacity required, the amount used for 2.5 days with zero recharging is the base figure we use for determining the battery capacity. Recharging capacity should be determined by the capacity used in 24 hrs being able to be replaced in a day and half using 5 hrs per day peak sun if relying on solar only or if you have combined charging capacity, to be able to replace the 24 hrs capacity during your normal charging cycle.

Clearly, if you have an all electric galley that is very power hungry, running the generator during the peak energy use would save the need for a very large battery capacity ....

T1 Terry

[newhaul]

Ok got the nuwave2 yesterday and ran a test 4 cups tap water approx 60°F to boiling in 7 minutes. Using an egg timer 3,4,5 minute respective.

https://youtu.be/yU9HHmGk0HA
Next is to test it on the inverter

[CatNewBee]

It will work as it should, no worries.

[Adelie]

Originally Posted by T1 Terry

This is part of determining the battery capacity required, the amount used for 2.5 days with zero recharging is the base figure we use for determining the battery capacity. Recharging capacity should be determined by the capacity used in 24 hrs being able to be replaced in a day and half using 5 hrs per day peak sun if relying on solar only or if you have combined charging capacity, to be able to replace the 24 hrs capacity during your normal charging cycle.



Clearly, if you have an all electric galley that is very power hungry, running the generator during the peak energy use would save the need for a very large battery capacity ....



T1 Terry

“Large” is in the eye of the beholder.
If I had a 40’ boat I wouldn’t bat an eye at having 300Ahr at 48v.
On a 30’ that would be a lot more involved.

[more]

Originally Posted by Adelie

“Large” is in the eye of the beholder.
If I had a 40’ boat I wouldn’t bat an eye at having 300Ahr at 48v.
On a 30’ that would be a lot more involved.

40’-45" boat is small boat
for example Winston cell 300 AH have 10 kg you want 16 pcs 160 kg battery

But usually 40" sailboat have max allowance passanger, cargo,bags 1000-1200 kg

[newhaul]

Originally Posted by more

40’-45" boat is small boat
for example Winston cell 300 AH have 10 kg you want 16 pcs 160 kg battery

But usually 40" sailboat have max allowance passanger, cargo,bags 1000-1200 kg

Except many like me are cruising on sub 36 ft sailboats .
20 years ago a 40 was considered a large cruiser. It's all about optics.
Myself 29 ft and 250ah lfp much more won't fit comfortably.

[CatNewBee]

True, size the battery to your needs and habits.

The smaller the boat, the more benefits a LFP has over lead acid (higher energy density and lighter) Also you can fit a LFP virtually everywhere, because of the available form factors of the cells. You can use very narrow compartments or unorthodox shapes. The cells stay cool and have a very long life if treated well, so you can "burry" the battery somewhere where you usually not have easy access all the time.

[Adelie]

Originally Posted by CatNewBee

True, size the battery to your needs and habits.

The smaller the boat, the more benefits a LFP has over lead acid (higher energy density and lighter) Also you can fit a LFP virtually everywhere, because of the available form factors of the cells. You can use very narrow compartments or unorthodox shapes. The cells stay cool and have a very long life if treated well, so you can "burry" the battery somewhere where you usually not have easy access all the time.

LFP energy density is on the order of 1.5 to 2.0 times better than LA batteries so only somewhat better. If you DIY these it will be closer to 2.0 or perhaps slightly better and you can make custom shapes.

LFP specific energy (W/kg) is about 3 times better than the best LA for off the shelf items. For DIY it might be slightly better.

You can only do custom shapes if you DIY or maybe you can pay a premium for someone to do it for you.

[newhaul]

Originally Posted by Adelie

LFP energy density is on the order of 1.5 to 2.0 times better than LA batteries so only somewhat better. If you DIY these it will be closer to 2.0 or perhaps slightly better and you can make custom shapes.

LFP specific energy (W/kg) is about 3 times better than the best LA for off the shelf items. For DIY it might be slightly better.

You can only do custom shapes if you DIY or maybe you can pay a premium for someone to do it for you.Attachment 241652

I would be happy to help them with custom shaped DIY banks .
Edit my bank is 27 pounds for 12v vs 67 for each Trojan 6 volt so 134 pound trojan bank of similar size

[T1 Terry]

Originally Posted by Adelie

“Large” is in the eye of the beholder.
If I had a 40’ boat I wouldn’t bat an eye at having 300Ahr at 48v.
On a 30’ that would be a lot more involved.

Large is capacity compared to use, the actual area the battery can fit is a consideration for sure, but a single battery built from cells in series does not suffer the problems that batteries in parallel suffer when it comes to mounting the groups in different positions so available space can be used to accommodate the capacity battery required. I doubt weight would ever be a consideration when it comes to sizing a lithium battery to replace a lead acid battery, 4 times the usable capacity weight for weight when shifting from lead acid to lithium ...... well, quality lithium cells anyway

T1 Terry

[Adelie]

Originally Posted by T1 Terry

Large is capacity compared to use, the actual area the battery can fit is a consideration for sure, but a single battery built from cells in series does not suffer the problems that batteries in parallel suffer when it comes to mounting the groups in different positions so available space can be used to accommodate the capacity battery required. I doubt weight would ever be a consideration when it comes to sizing a lithium battery to replace a lead acid battery, 4 times the usable capacity weight for weight when shifting from lead acid to lithium ...... well, quality lithium cells anyway

T1 Terry

Large can be interpreted several ways, mostly related. Large capacity compared to use/demand implies more battery capacity whether moving up from very small to medium sized or from medium size to large, or large to very large.

More capacity compared to demand than normal means you would also have a larger battery physically.

[Adelie]

Originally Posted by newhaul

I would be happy to help them with custom shaped DIY banks .
Edit my bank is 27 pounds for 12v vs 67 for each Trojan 6 volt so 134 pound trojan bank of similar size

Here’s the sheet with weight & volume info for for NewHaul’s DIY battery. I thought I’d posted this back in Dec/Jan.

[newhaul]

Originally Posted by Adelie

Here’s the sheet with weight & volume info Attachment 241779for for NewHaul’s DIY battery. I thought I’d posted this back in Dec/Jan.

Thank you for making this chart and posting the updated list showing all weights and sizes for accurate comparison

[Steve_C]

CatNewBee now that you have lived with your Winston 1000ah cells would you still go for this size? I built my first
bank with smaller cells, but I am getting ready to start a build for my new Lagoon and will definitely be using Winston cells, and I am currently strongly leaning towards the 1000ah size.
Any thoughts or suggestions?