Electric advise - Off-Grid/12V/230V EHU

p1woody

New Member
Hoping for some help regarding electrics.


Recently purchased very tidy T6 example camper, with basic 12V lead battery powering the fridge, LED lights & USB connections. Me being me, cheque book is out, and I want to overhaul it so it’ll be able to cope with “off-grid” camping and not rely on electric hook up.



My idea in theory is to swap the 12V lead leisure battery out or a 230Ah lithium leisure battery, which will run the 12V feeds – Fridge, LEDs, USBs etc. To charge the 230Ah leisure I’d like to have 2 options.



Charging method 1 – charging direct off the starter battery, which I presume would need a DC/DC charger? If the voltage on the leisure battery is low when parked up, will this drain the starter motor battery down or does the DC/DC charger protect this via ignition switch live feed?



Charging method 2 – I like the idea of purchasing a Jackery 1000 Explorer V2, using one of the 230V outputs to run a lithium charger, to top the leisure battery up. The Jackery can be used pure off-grid with solar keeping it topped up, and the Jackery keeping the leisure topped up.



With the leisure battery charging sorted, I’d then charge the Jackery 1000 Explorer V2 via 2 methods, first method is 200W solar from Jackery themselves & the second method where applicable is with electric hook up, using the Jackery 3-pin charging cable.



My question in reality is what protection is needed for all of the above methods to run happily along each other. I’m happy with how in theory the set-up will run but just want to know if I’ve overlooked something with regards to over-charging or more protection needed.
 
The DCtoDC (B2B) should be wired to only charge when the engine is running, so no flattening the Starter.

To charge from the Jackery 240v you will need a mains charger, so effectively you are putting a 240v setup in to the van as per normal. A proper Lithium aware charger will not overcharge the Leisure battery.

But you may as well charge the Lithium directly using the portable solar and a decent MPPT controller.

The only real advantage of the Jackery in this situation is that you can take it away from the van, say to a friendly pub, and charge it up.
 
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