Changing varta 92 ah battery for a 150ah lithium in g c 600

[leeb]

I don’t just the panels, when it needs speed you can charge to 100% from a normal 220v socket in about an hour, or from a 12v socket while I’m driving all 3 options are better than relying on a single 175w solar panel that VW offer from the factory - It works for me anyway and the cost was about £1,200 all in !


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Clearly works for you..but relying on charging from a 240v outlet rather defeats the point of an off grid solution for us
The cost of a replacement 150 Ahr lithium battery, and a 50A dcdc charger plus installation around 1500 quid...so not much different. Currently we are using in France and with fridge on continuously plus general living electricity draw we have never had the battery below 60% charge. Solar from the vw panels provides reasonable top up and drives between stops dumps 50A (600w)/hour driving. Not hooked up to a 240 v supply for about a week now.
The panel shows 100% battery SoC at all times !...and despite the dire warnings of electrical shutdown when 30plus amps of draw has occured (through the KFG)...this hasn't happened to us as yet

 

[G-A-R-Y]

Clearly works for you..but relying on charging from a 240v outlet rather defeats the point of an off grid solution for us
The cost of a replacement 150 Ahr lithium battery, and a 50A dcdc charger plus installation around 1500 quid...so not much different. Currently we are using in France and with fridge on continuously plus general living electricity draw we have never had the battery below 60% charge. Solar from the vw panels provides reasonable top up and drives between stops dumps 50A (600w)/hour driving. Not hooked up to a 240 v supply for about a week now.
The panel shows 100% battery SoC at all times !...and despite the dire warnings of electrical shutdown when 30plus amps of draw has occured (through the KFG)...this hasn't happened to us as yet

I concur. It's a no brainer.

 

[secret lemonade drinker]

This one works in the dark!

Overview

Our Inverter generators are perfect for back up or outdoor events. These models can operate a wide variety of appliances with a clean electricity supply.

www.honda.co.uk

 

[AL-at-the-wheel]

Yes at present although I do have a 15 amp victron lithium charger in the cupboard ready to fit. So far it seems unnecessary. I'm still at the testing stage.

Hi,
Did you get fitting the Victron charger? I had a look at the Dometic charger fitted as standard under the passenger seat and have noted an extra wire, a thinner gauge, blue wire going into a connector plug, which branches into four wires? Do you know what the blue wire is for?

Many thanks.

 

[G-A-R-Y]

Victron charger fitted and charging the Lithium via a Wago in the technical cupboard
(+ 7.5amps).

With the under seat charger, fuse six removed (supply to leisure battery), when on hook up it still charges engine battery and low amps.

 

[GordonH]

Looks like you also have an inverter - the 3 wire connector -blue/black/red. That’s not a UK option so can’t help with that unfortunately. The 4 wire connector to the EHU charger is leisure battery/starter battery/-ve & signal wire for KFG which outputs 12Vdc when 230Vac is present.

 

[mobeleven]

J'ai ajouté une batterie LiFePO4 de 100 Ah dans le placard arrière avec un convertisseur CC-CC de 30 A connecté à l'arrière de l'interrupteur d'isolement que j'ai remplacé par un interrupteur 1-2-off. Donc, essentiellement, la batterie AGM d'usine charge ma batterie au lithium. Les paramètres du CC-CC sont tels qu'il arrête la charge lorsque l'AGM tombe à 80 %. Tout est contrôlé via l'application Victron.
Cela signifie également que le solaire continue de charger la batterie AGM et que celle-ci charge à son tour le lithium lorsque le véhicule est stationné, et lorsque l'alternateur roule, il charge l'AGM qui à son tour charge le lithium.
J'ai cette configuration depuis presque un an maintenant et elle fonctionne bien. J'ai toujours sélectionné l'interrupteur d'isolement de la batterie sur le lithium, ce qui donne déjà une capacité utilisable bien plus importante que l'AGM.
Cette configuration fonctionne bien si vous n'avez pas besoin de 230 V « hors réseau », ce qui ne me dérange pas.

Bonjour Monsieur T, avez-vous des photos et des schémas de votre montage ?
Bien cordialement
Julien

 

[AnaMV]

Hi, I have tried this myself, I have an eco tree lithium battery which I've used on a previous motorhome.
So .....
You can do it, however there are some things you need to be aware of ...

You can simply swap out the battery under the bonnet (Habitation) battery with the Lithium battery.
Everything will work, as with the AGM battery .....

EXCEPT FOR ..

The Battery charge indicator on the control panel will show the battery as being 'full' pretty much until it isn't, this is something that you can't change (without re-coding the vehicle software) which is not easy to do.
The lithium battery will ONLY charge when the 'fast charge' button is pressed on the dashboard.
The Lithium battery will drain very quickly (20+ amps) as soon as the engine is stopped after it has been on charge using the method above.
You MUST stop the engine, switch off the ignition and then it will stop discharging.

I tried it for a few months and I've now re-fitted the original AGM battery as the lithium battery just created other problems which I felt weren't worth the benefits.

So, in short, yes, a direct replacement is possible if you're happy to put up with the issues above.

I've added a second battery in the rear cupboard by changing the battery isolator to a 1, 2 & 1+2 selector switch, it then increases the capacity by 100% so around 100ah which is fine for 2 nights off-grid, using fridge and lighting, TV, charging devices etc.

If you need more than this 'off-grid' time you can have a lithium system fitted which replaces the charging (DC-DC) MPPT if you have solar, and so on, but they come at quite a high premium.

Hope this is helpful to you in some way.

Hi. Were you able to deplete ( empty) the lithium battery to 0 % or only half or 90 Amp?

 

[DLCALI23]

Hi. Were you able to deplete ( empty) the lithium battery to 0 % or only half or 90 Amp?

Hi, sorry I've not got back to you sooner, yes you can, I set mine a 10% baseline, this will help preserve the longevity of the lithium.
I've been trying using both batteries at the same time with some success, however, it is very important to know that only discharging. NOT CHARGING. As the charging profiles are quite different and the OEM cables are not up to it.
Having both batteries connected at the same time can extend the off-grid experience, to around 2-3 days, this is achieved because the lithium standing voltage is slightly higher than the AGM it will deplete the lithium battery first, it will keep the AGM topped up to 'float voltage' so when the lithium is depleted the AGM simply works as it would without modification.
It is very important to understand that I charger the Lithium battery separately on a dedicated charger.
DO NOT ATTEMPT TO CHARGE BOTH BATTERIES AT THE SAME TIME ON THE SAME CHARGER,
It won't end well.
I'm trying a few options before I make the final installation.
It would be good to hear other peoples experiences.

 

[Blue Grand Driver.]

All solved by using a small father/son outfit near Wantage, Off grid Power Solutions.
Replaced leisure with a 150Ahr LiFePO4 battery, replaced split charge relay with victron 50A DCDC charger and reprogrammed Votronic MTTP solar controller to Lithium. All work completed in a matter of hours. Battery has a bluetooth output to monitor charge/draw and level.
All works impressively well. Battery charge level around 60% on installation, by the time I had driven home (3 hours) the battery had soaked up the 60 or so Amps required to be fully charged. They did the whole job in a few hours and with no new holes drilled etc it would be possible to reinstall the old set up should you ever wish to do so! Not sure what the GC control panel will make of this but I will report back after our upcoming trip to France.
Photos below

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View attachment 128240

Hey Leeb, love your solution. Just waiting out my warranty before changing. Any other tips or issues? Is it still working fine? No need to push the extra charge button on the dash I presume? Thanks, Graeme.

 

[leeb]

Hey Leeb, love your solution. Just waiting out my warranty before changing. Any other tips or issues? Is it still working fine? No need to push the extra charge button on the dash I presume? Thanks, Graeme.

All works pretty well. We had a few issues with the victron dcdc charger not detecting that the alternator is up and running on occasions. Various changes to the charger settings were made but didn't solve the issue completely. I plan to add a votronic D+ simulator to the system this spring. This little gizmo detects vibration of the engine block (alternator running) and activates the charger...simple! No need to find voltage changes etc.
Absolutely no need to push any buttons...when charger is active a 150Ah battery is fully charged from dead in 3 hours of driving....this, of course, is around 3 times the stored, useable, power you currently have available.