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Thread: Recommended papers/pdf's/websites on charging Lithium Batteries?

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    Recommended papers/pdf's/websites on charging Lithium Batteries?

    I would like to go Lithium in the new caravan, but the same requirements as now, the van needs to be its own master, it must live in total isolation from the tow..ATM I dont EVER think about 12Vcapacity in our old Golf. 500 odd watts and 340 odd Ahrs seems to have worked well for the last 8 years.
    As this is a Forever Van I want to get it right first time and not just get whatever the van manufacturers can buy on special that week--

    I keep hearing rumours about full size Dometic fridges running around 10Ahrs( this lead Mrs Pedro to ask why not two 95L Engals? )
    which to be truthful 10 blows my brain a bit.. no wonder most new vans tie up to a wharf each night..

    I would imagine the list of power draw starts at the fridge, say 10, add 3 for the TV, 5-6 for the stereo, anyone know the draw from Satellite TV?


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    Iíll have a crack...

    Re: new fridge - 10ah/hr constant or only while cycling. Grab 2 x cans off XXXX each time you open the fridge and you will save some power.

    I follow a page on Facebook thatís seem pretty good, it more aligned to building your own with separate BMS.

    Given your happy with current amount of capacity and solar....looks like you only need to take into account the new fridge usage. Going to lithium isnít any different to selecting AGM. You need storage (to match you usage) , a means to charge (alternator, 240v and solar)

    Going to lithium will be influenced by budget....big capital outlay at the front end but once installed it set and forget.......

    your current setup as 150-200 usable amps and youíre getting by fine

    Re: battery - 1 x 300 lithium or 2 x 200ís

    Solar - The good olde internet bashes on that you need to double your storage AH in solar panel watts......depending on roof design on caravan this could be a challenge. Install as much solar as you can fit.

    DC-DC, solar controller, a shunt, maybe an inverter are all pretty straight forward.

    Enderdrive are doing some nice pre-assembled units, you just need to select battery size, all plug and play, including the 240 Side for the caravan builder. I found Enerdrive product support amd engineers easy to chat to.

    It might be worth reaching out to Jason @ Off Road Living, I found these guys very helpful.

    Caravan manufacturers should be across it by now......although some research in the bag is handy when chatting to them

    Good time to ditch gas as well Recommended papers/pdf's/websites on charging Lithium Batteries?

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    Need to readup on Lithium charging... the only 240V we use ATM is Di's CPAP,


    Have heard good things about Enerdrive,

    ditch gas?!?! are you bonkers??? I'd be divorced quick smart! Diane does bang on a lot about cooking with gas,, but not as much as she bangs on about NOT cooking with gas
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    Recommended papers/pdf's/websites on charging Lithium Batteries?

    What do you cook on if you ditch gas and want to be stand alone? Induction? Always seems such a waste having to over spec the entire system - inverter, batteries, cables, etc to use electric for cooking off grid when gas is so available anywhere and if youíre only running a cooktop a 9kg bottle lasts ages. Want to simmer a stew for a couple of hours - forget it on induction and batteries.
    Last edited by Homestar; 1st March 2021 at 04:16 PM.


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    To answer your questions from where I see them Pedro.

    Fridges - yes, most caravan full sized fridges use a wad load of power when running on 12 volt - they're only designed to run off 12 volt from the tow vehicle and be used when in motion - the rest of the time it's gas or 240 volt. If I was doing something from scratch, I'd use 2 x 90 litre Engels - 1 fridge, 1 freezer - power draw from the pair will be around 3.5 amps with both running and easy to keep up with off batteries and solar with a stand alone system.

    I keep my 90 litre Engel in the van off 550 watts of solar and 1 x 100Ah hour lithium, using Victron solar controller and battery monitor - see pic below Lithium battery is from Drivesafe - very happy with it. The solar controller has a lithium setting so that looks after the charge profile. You'll need a battery management system that can keep track of what goes in compared to what comes out as the voltage on a Lithium stays almost the same right until the end, so using a standard voltmeter like you would for AGM won't work. The other think I like about the Victron units is they Bluetooth to your phone so setting them and keeping an eye on things if you want to is very easy although it was a set and forget type of thing for me - once I knew how quickly it charged each day, I never really bothered to check it again.

    I've actually just removed all of this from the van and will be fitting it to the motorhome instead as the van will be up for sale at some point and I wouldn't get my money back on this stuff and it's proved brilliant. I will be adding a second lithium battery into my new system and using around the same solar - I've found that even on overcast Victorian days, the battery was full by lunch time even if I'd been running the TV, heater, etc along with the fridge. I will be adding a large inverter to Stan - only to run the coffee machine once a day, but I think 600 odd watts of solar would still take carer of that no dramas.

    Other thing I'll add to Stan is a 240 volt charger that has a lithium profile so I can charge it when it's plugged in - we do use caravan parks with it as well, so might as well take advantage of that - I won't be hooking the lithium up the vehicle to charge - that would required yet another device and it really won't need it once the panels are on the roof shortly. I never charged the caravans system from the vehicle either - never needed to with this system.

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    Quote Originally Posted by Pedro_The_Swift View Post
    Need to readup on Lithium charging... the only 240V we use ATM is Di's CPAP,


    Have heard good things about Enerdrive,

    ditch gas?!?! are you bonkers??? I'd be divorced quick smart! Diane does bang on a lot about cooking with gas,, but not as much as she bangs on about NOT cooking with gas
    Charging lithium is not a lot different than how your charging your existing AGM.....all decent brands of 240v chargers and solar regulators have a lithium setting/profile...set and forget.

    Yeah ditching gas isnít for everybody especially when youíre towing.....weíre not towing so induction and 12v oven covers all our cooking needs.

    What size inverter does a CPAP need.....?

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    So was just looking at freezer draws so I could run a small freezer under the 90 litre engel in Stan and found these - Bushman 190L 12V Caravan Fridge | Free Shipping & Bushman 285L 12V Caravan Fridge | Free Shipping

    Runs a proper 12 volt compressor system so light on the power draw unlike the 3 way units that are mostly for sale - cheaper than 2 x 90 litre Engels too. Now I'm thinking of a revamp of the fridge area for Stan...


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    Quote Originally Posted by Homestar View Post
    What do you cook on if you ditch gas and want to be stand alone? Induction? Always seems such a waste having to over spec the entire system - inverter, batteries, cables, etc to use electric for cooking off grid when gas is so available anywhere and if youíre only running a cooktop a 9kg bottle lasts ages. Want to simmer a stew for a couple of hours - forget it on induction and batteries.
    Diesel.
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    Quote Originally Posted by Homestar View Post
    So was just looking at freezer draws so I could run a small freezer under the 90 litre engel in Stan and found these - Bushman 190L 12V Caravan Fridge | Free Shipping & Bushman 285L 12V Caravan Fridge | Free Shipping

    Runs a proper 12 volt compressor system so light on the power draw unlike the 3 way units that are mostly for sale - cheaper than 2 x 90 litre Engels too. Now I'm thinking of a revamp of the fridge area for Stan...
    Iím a fan of the draw fridges.
    You can install multiple units, have a decent capacity if needed and only run those you do when you donít need the others.

    3 will give 120l capacity - 80l fridge, 40l freezer or any combo.
    Cheers
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    Recommended papers/pdf's/websites on charging Lithium Batteries?

    Quote Originally Posted by Tombie View Post
    Diesel.
    Ah yes - True I suppose if youíre pockets are bottomless and weight is no issue. Havenít seen many of these and the cost is eye watering from what Iíve seen but probably no more or even cheaper than stuffing in as many batteries as you would need to run induction.


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