DRAFT
#Renogy is not the best but OK they are a #dotcons so have lots of coupons and discounts https://renogycanada.refr.cc/default/u/hamish think this is 10% off, there should be more, it’s a one shop.
Could try a more “native” path of https://www.bimblesolar.com/ but not as simple, though good if doing the solar panels as well.
The batteries are simple: https://uk.renogy.com/core-12v-24v-48v-200ah-deep-cycle-lithium-iron-phosphate-battery This could be done in a quick simple solar only way, maybe using the current #MPPT charge controller if it can be set for #LiFePO4 or if the charge controller needs replacing we could try for a much more complex dual engine and solar path: https://uk.renogy.com/dcc50s-12v-50a-dc-dc-on-board-battery-charger-with-mppt-new-version I did try and implement this more complex path 2 years ago, and it did not work, but with 2 years of upgrades it likely works OK now.
Then is a simply wiring and testing process, a bit of time, am happy to assist for mate’s rates as it’s a good thing to document for #DIY offgrid culture.
UPDATE:
#Bimble has come out with much cheaper batteries https://www.bimblesolar.com/batteries/12vbatts/Epever-12Vlifepo4-200Ah but no alternator engine charging path, so only the simple solar only path.
UPDATE:
The price of LiFePO4 has dropped so much that now it makes no sense to go for older technology need a new battery for my tender electric outboard, might try one of these https://aolithium.com/?ref=lifeboat anyone any experiences with the brand?