RV 18650+solar+alternator+mains

[Shawnturner]

Hi guys

I’m looking to build a wall for my soon to be converted van (kind of RV) to support a fridge (12, water pump and my electronics like smartphone, laptop and projector.

Most RV enthusiasts will have AGM batteries/lead acid combo but i would like to try my luck having a powerwall as any « normal » house would have.

The battery bank will have 3 sources for charging being from the most desirable to the least: solar, van alternator and mains when available.

Current parts wish list:

– Solar panel: GWL/Power Solar panel GWL/Sunny Mono 300Wp 32V
– Pure sine inverter: there’s a choice between 12/24/48V/120V and 1000w 1500w 2000w 2500w 3000w to run my electronics
– CTEK D250S Dual: it’s dual purpose, it’s a MPPT controller and is also a automatic commuter from alternator charging to solar charging
– CTEK SMARTPASS: will allow charging up to 400Ah
– Mains charger for when i have access to 220v AC: did not find the best option yet to charge 18650 battery bank

Project goals/considerations:

– power the fridge 24/7
– easy to build as my knowledge is limited
– all i have a soldering station
– do it low cost – getting used laptop batteries to get cells from (already have some at disposal)
– safe to use: i will put the battery bank in a safe vented enclosure but it will still be inside the van where i will be sleeping
– up-gradable: i would like to be able to size it further by adding banks whenever i get enough cells to build more. therefore, i would like to build it in a way that the system is already ready to accept more capacity

What are you toughts on this?

Should i go for it or should i just stick to the mainstream acid batteries for this purpose?

Please help.
Thanks!

I didn’t find the right solution from the Internet.

References: http://diypowerwalls.com/t-RV-18650-solar-alternator-mains

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