betty boop wrote:On our old boat we had 1 80A battery and the radio ran it flat very often (different batteries over 10 years) , mostly on the drive whilst cleaning etc. as I rarely used the radio on the water (engine off) for fear of getting stuck. The battery was always fully charged and in A1 condition. It occurred to me once in Shoreham with a flat battery that jump leads tend to be a bit short. The answer to that issue was a £50 glove box lithium battery starter (which matched the 3.0L merc).
In my experience of loud music and waiting for wives whilst they're shopping time off charge is limited. Even IF you run the experiment on land and you get 4 hours music there is nothing to guarantee it lasts that long 2 miles off coast and then you're in trouble.
Our new boat has 2 x140A batteries (upgraded by the last owner from 1x 100A ) that Im refitting today, squeezed into one port locker (hence the 4 hour refit time and aching arms) Cant say I find it performance affecting but we have a central fuel tank this time and forward water tank so it may counter the extra.
hope that helps
This is what i am afraid. The risk of flattening the battery. Mainly the need is when we take her on holiday. Previously to the Med. Anchor up in a bay for several hours it's nice to have music and also I run an electric pump for a big lilo and sometimes donut. Going to Lake Annecy this summer and expect to be out in the boat for much of the day and don't want to get stuck. Discussed with my engineer today and we decided we could squeeze the existing 95ah battery through the starboard gap. I thought it was too tight but he says it's ok. So think I will use bite the bullet and buy another dual purpose battery and go for it.
Thanks for all the thoughts and input.
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