Lithium Question (1 Viewer)

[DDJC]

Going lithium in June.
Which is better. One 200a or two x 100a?

 

[Jimbohorlicks]

I went for 2x 100 ah as there was no space for one bigger battery.

 

[Pausim]

I am favouring 2 x 100Ah and avoiding ones with Bluetooth built in. Just something to go wrong and people with Bluetooth seem to find that it is not covered by the cell warranty. 2 batteries means that if one goes wrong you still have some power.

 

[L' Hobo]

I know nothing about lithium but, it's better to have 2 then if something goes wrong in the battery dept. you still have a 100ah instead of nothing?

Edit, Two minds thinking the same!

 

[Geistguy]

I went for a single 300ah as the dimensions were identical to my old 120ah. I figured that there was less to go wrong with just one battery. I have to add that it's great not to have to worry about 12v use now.

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[SMB]

I've opted for a 300a Fogstar Drift as I only have room for one leisure battery and this is more or less a straight swap for the existing AGM 95a battery. Charging system upgraded to Victron 30a B2B, 30a battery charger and smartsolar 100/30 solar controller.

 

[Jev88]

The only reason I would consider two / one battery is if a single battery couldn't handle the load placed on it, which will be down to BMS and manufacturing design.

 

[stevewagner]

You can usually draw more current with multiple lithium batteries

 

[headlight]

I've had 2 x 105AH in parallel and now a single 230AH.
Both set ups had 200AH max discharge
The single battery is easier wiring and less chance of having BMS problems than a parallel set up.

 

[DDJC]

Thanks everyone. How long will your setups power a fridge? Im thinking of the 8 hours+ time on the Portsmouth St Malo ferry

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[Lenny HB]

Thanks everyone. How long will your setups power a fridge? Im thinking of the 8 hours+ time on the Portsmouth St Malo ferry

You don't need to power it for 8 hours, if you don't open the door they stay cool for 24 hours.

 

[DDJC]

You don't need to power it for 8 hours, if you don't open the door they stay cool for 24 hours.

I wish. Stuff in the freezer has defrosted. So i refer back to my original question!!

 

[headlight]

I wish. Stuff in the freezer has defrosted. So i refer back to my original question!!

How many AH does your fridge take ?

 

[L' Hobo]

I wish. Stuff in the freezer has defrosted. So i refer back to my original question!!

Eat stuff in freezer and stock up on the other side, Simples!

 

[G1969]

Thanks everyone. How long will your setups power a fridge? Im thinking of the 8 hours+ time on the Portsmouth St Malo ferry

Mine uses about 20amp per hr, so 160amps

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[tonka]

Mine uses about 20amp per hr, so 160amps

Are you talking compressor fridge or 3 way absorption? That's a lot of power, if it's a 3 way type the 12v is only designed to maintain once cold it will not continue to cool or freeze. AFAIK.

 

[Tombola]

I wish. Stuff in the freezer has defrosted. So i refer back to my original question!!

Mine is a largeer dometic 3 way ...uses average 12 -14 amps per hour via inverter when taking cycling on and off into consideration. Turn it in to it's lowest setting

I went for 2x 200 ah batteries for redundancy if there was a problem with one

 

[Coastal Cruiser.]

12v is only designed to maintain once cold it will not continue to cool or freeze. AFAIK

I did actually have mine on 12v as to lazy to get the EHU lead out and plug in from when the fridge/freezer had been switched off for weeks, it took a few days and a very big draw on the batteries but it froze up.

 

[bigtree]

I wish. Stuff in the freezer has defrosted. So i refer back to my original question!!

Put a bottle of frozen water in the fridge and freezer.

 

[Jim]

I'm so fed up of my hairdryer draining my batteries, I've gone for 2 x 300AH Drift Pros. They are being Fitted at VanBitz on Tuesday

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[Plumb]

I'm so fed up of my hairdryer draining my batteries, I've gone for 2 x 300AH Drift Pros. They are being Fitted at VanBitz on Tuesday

Did you say air fryer !

 

[Jim]

Did you say air fryer !

No idea what an Air Fryer is, I'm guessing it's a kitchen thingy. Not my department.

 

[autorouter]

Thanks everyone. How long will your setups power a fridge? Im thinking of the 8 hours+ time on the Portsmouth St Malo ferry

My 3-way fridge takes about 14A when it's on 12V power. For 8 hours that would take 8 x 14 = 112Ah in theory. So your 200Ah of lithium would be fine for that. The older fridges with smaller 12V elements just maintain the cooling, but the later fridges with full power elements (14A x 12V = 168W) will keep the freezer frozen just like the mains element.

 

[DDJC]

Eat stuff in freezer and stock up on the other side, Simples!

Id love to, but the boys have mega autism (non-verbal and semi-verbal) and the younger (the semi verbal one) only eats eight things, four of which you can't get outside UK!!! Has anyone ever seen Yorkshire puds in Carrefour or SuperU?!!!

 

[Langtoftlad]

Has anyone ever seen Yorkshire puds in Carrefour or SuperU?!!!

No, but surely they have the ingredients ?


Perhaps a bit flippant.

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[DDJC]

Is a 3 way fridge/freezer one that runs on 230v, 12v and gas? If so, I've got one. Thetford, dunno what model but it has seperate freezer.

So for safety, i need 200amp lithium as a minimum. Prob 280.

Ok, so ive got an inverter as well. Is it better to plug in the inverter to keep the fridge going at 230v, or keep it on 12v?

Last question, if it runs down the lithium leisure battery, will it start to nick power from the cab battery, and empty that out?

Cheers for the advice everyone. Electricity novice.

 

[DDJC]

No, but surely they have the ingredients ?


Perhaps a bit flippant.

Dont worry about it! Yes of course, and i can. But. Autism is a strange and utterly frustrating condition. My youngest would seriously not eat rather than eat 'off menu'!! And a Yorkshire pud is a certain shape and colour. If it doesn't look like something out of Aunt Bessie, he wont eat it!!

You cannot know how much of a pita this is !!!
And of course Mrs DDJC is glucose free. We never eat out!!

 

[Tombola]

Is a 3 way fridge/freezer one that runs on 230v, 12v and gas? If so, I've got one. Thetford, dunno what model but it has seperate freezer.

So for safety, i need 200amp lithium as a minimum. Prob 280.

Ok, so ive got an inverter as well. Is it better to plug in the inverter to keep the fridge going at 230v, or keep it on 12v?

Last question, if it runs down the lithium leisure battery, will it start to nick power from the cab battery, and empty that out?

Cheers for the advice everyone. Electricity novice.

Unless you or someone else has wired it to run off 12v from your leisure battery then no.
It will only run on12v with engine running.
Again no it won't then drain your cab battery.

You don't need it on 8 hours..flick it on a couple of hours after boarding you'll be fine...if it gets close (it won't on low) then flick it off again..
My old 200ah battery would run the fridge freezer overnight no problem on my 3 way via inverter with a good bit left in the morning when the sun came up

Do you have solar and b2b to top your battery back up when you arrive

 

[Langtoftlad]

Unless this is a one off... how about investing in a 12v freezer box?
I have one I used to use for Kerry's [RIP] frozen raw food blocks.
Works a treat

 

[Tude]

Well I contacted 3 battery manufacturers they all if you can get one large it’s better than two smaller. Reason less complicated