Diagrams, Schematics & Wires -- How I Done It --

[stoic]

I will add my current system here for reference, purpose was building cheap and reliable system, hence currently solar panel will not be installed in a fix point, but connected to small power station as required.

 

[Phil Downhill]

- Aux Lifpo4 Battery & DC-DC & MPPT & LTD & LBP -


Here we have a LifPO4 battery setup.
The DC-DC charges when engine running.
The MPPT charges when sunny outside,
Lifepo4 LTD (low temp disconnect) of DC-DC via BMV712 relay contacts.
Lifepo4 LTD (low temp disconnect) of MPPT via BMV712 Temp sensor and VE-Direct.
Lifepo4 LBP (Low battery protect) via Victron 100A Smart battery protect.

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Hello I am new to this forum so apologies not sure how to get into discussions , if you can help let me know , I have t6.1 and have had problems with AGM Leisure battery running them flat and split charger ( Sterling Power ) not charging the battery fully even after long drives , reading up on this forum it appears the regen start stop technology is great for charging LB to the point I was thinking to remove the Sterling Power DC/DC split charger and just fitting largest Lithium battery I can fit with AC/DC charger and just re charging it when it gets low from electric hook up. It mainly runs the fridge 3.5 amps with 200amp hour battery should last 3 to 4 days ? with the solar trickle charging.
I have MPPT solar charger 100Watts and I always wondered if the volts produce by the charger confused the split charger into thinking the battery was more charged than is really was ? I see on your diagram that you have an PV isolator why is that ? mine is permanently connected.
So my questions are:
1/ DC/DC split charger is to worth fitting ?
2/ Lithium battery is this the best option for LB ?
3/ I have AGM starter battery any conflict with fitting Lithium LB on a split charger
4/ Solar Isolator is this required ?
thanks in advance
Phil Mallen

 

[voltswagon]

Do you have any photos or a diagram of how you have wired it up currently? Also where the leisure battery is located.

In my t6 I simply removed the relay under the passenger seat & re-used the main battery wire from the factory leisure system into the ctek250 and also reused the ignition feed for power on.

Works great.