Although a newcomer to both narrowboat ownership and this forum I have spent some time looking through previous posts about batteries and charging and, whilst some of my information is a bit sketchy I have reached some conclusions on which I would welcome the panels views/comments/recommendations. It's a bit long winded but I've tried to give all the information I have.
Our boat is a 15 year old 57 foot Trad with an Isuzu 4LC1 engine and the following battery/charging set-up:-
6 x 12v 110 amp hour batteries make unknown (no labels) of 2007 vintage (yes 2007 as confirmed by the previous owner) plus one new 90 amp hour starter battery. There is an 80 amp alternator feeding through a sterling alternator to battery charger, a 3000w pure sinewave inverter made by EDPN Technologies (Singapore?) and a mains battery charger by Halfords when on shore power. The batteries gave us no problems during our 9 day trip from Mercia marina, where the boat was purchased, to her permanent berth at Crick marina but I am conscious that they must be reaching the end of their useful life.
Our usage of the boat is likely to be occasional week/weekend trips with possibly a couple of 3 to 4 week cruises each year. Other than that the boat will be in a marina on shore power.
As suggested by other posts I have attempted to complete a power usage audit as a result of which I am reasonably confident that, by changing to LED lighting our daily usage will be around 100 amp hours (no TV, diesel heating, gas cooking but with LEC 240v fridge!!). Screenshot attached
My thoughts are to change the 6 old batteries for 4 x 110 amp hour (Banner seem well regarded), replace the mains charger with an Electroquest 30 amp smart charger and buy some kind of battery monitoring system ( again recommendations welcome!). Please be gentle.