Replacing battery in GC600

[Christopher Thomas]

Hi All
I´m thinking of replacing the existing lead battery with a Mastervolt lithium battery in the cubhoard at the back (next to the electrical cubhoard and including a Mastervolt combi inverter. Does anyone happen to have a copy of the GC600 electrical drawings?
Does anyone have experiences doing this on their GC?

 

[Jester]

Hi All
I´m thinking of replacing the existing lead battery with a Mastervolt lithium battery in the cubhoard at the back (next to the electrical cubhoard and including a Mastervolt combi inverter. Does anyone happen to have a copy of the GC600 electrical drawings?
Does anyone have experiences doing this on their GC?

Hi there I believe Mr T has

 

[Mr T]

Hi there I believe Mr T has

Thanks @Jester I have indeed.
@Christopher Thomas I have replied to your PM.

 

[mr pg]

I've just bought a 680 and would appreciate any info you have on Mr T on this topic as am very keen to improve the battery aspect.

 

[Mr T]

I've just bought a 680 and would appreciate any info you have on Mr T on this topic as am very keen to improve the battery aspect.

Hi, I have added a LiFePO4 battery in the rear cupboard of my GC600. I decided I didn’t need an inverter so have just added a 100ah battery.
My setup works via a new isolation switch I fitted, which is a 3 position, so I can have the original AGM battery running (switch position 1) switch to position 2 and have my LiFePO4 battery running. I have also installed a Victron dc-dc charger which charges my LiFePO4 battery from the original AGM leisure battery. The Victron settings (very important bit) mean that once the original battery drops to a certain voltage it stops charging. So when on hook up it charges fine via this route, as it does when driving. Also the solar still charges the original battery. This set up seems to work well. I see no benefit in removing the original battery. It controls certain things like the step and small lights. These items do not go through the isolation switch.
My needs were to just extend my “off grid” use by a few days.

 

[Christopher Thomas]

Any chance have a sketch of the switch connection?

 

[Mr T]

Any chance have a sketch of the switch connection?

I sent you diagrams and photos back in March so you should have all this in your messages.

 

[Christopher Thomas]

Great. Found it. One thing I didn’t do is add the switch. This has caused some problems as I disconnected the VW battery and things like lights and step have a life of their own.

 

[Tunco]

Mart ayında size diyagramlar ve fotoğraflar göndermiştim, dolayısıyla tüm bunları mesajlarınızda bulundurmalısınız.

Mümkünse bana da gönderebilirmisiniz? Teşekkürler

 

[Christopher Thomas]

 

[Pekis]

Reviving old thread but @Mr T are you still happy with the setup you have done with keeping the original AGM and adding extra lithium to the back? would you now go with the same one?

Im trying to decide between two options here.
1. Like Mr T add extra battery to the back compartment with dc to dc charger charging from original AGM at the front. This would allow me to put even bigger 200A lithium to the back as the front only could fit 100A Renogy battery. This would be also relatively easy installation without any bigger question marks.
One thing I'm not sure on this one is how exactly the 12.65V limit on the DC-DC charger will affect the AGM. While car is not on does the AGM still charge the lithium battery until it reaches this limit? Also not sure how powerful charger to install here because original cable size coming from the front.

2. Changing the existing AGM battery to lithium battery in the front. Some people have done this with just changing the battery and coding from OBD port so that charger is limited to 80A (selecting lithium battery). To this afaik it would be better also to add DC-DC charger so that the charging profile is not different from starter battery to the lithium (?) Also I have no idea where to install the DC-DC charger in the front if that is necessary