Re: [Amel Yacht Owners] Re: Engine and Service Battery circuits Isolated
toggle quoted messageShow quoted text
Hi Jean Pierre,
I had AGM batteries in my last boat. They were 5 years old when I sold the boat and in top condition. We had a large alternator on the engine with a 3 stage regulator plus solar panels with an MPPT controller, and this system kept the batteries in good condition.
Our Amel has a 175Amp alternator on the engine that has an automotive regulator in it...ie it produces 28.8 V all the time its running.
This is no good for any deep cycle battery, AGM or flooded...this I believe has been the nail in the coffin for my current lead calcium batteries....long hours of motoring with the voltage staying at 28.8
Deep cycle batteries need a bulk stage (max current until voltage rises to a preset value e.g. 28.8V), and absorption phase (constant voltage e.g. 28.8V until the current drops to a value of around 5% of total Ah capacity) then a float stage (constant voltage e.g. 26V)...this is what the dolphin chargers run from your genset do.
I'm replacing the 12 x 12V batteries with 12 x 6v AGM batteries wired 4 in series and then 3 banks in parallel.
I'm taking the automotive reg out of the 175A alternator and setting up a Next Step 3 stage reg...
And I'm putting up an arch (ala Bebe) on the stern to carry 3 x 190W solar panels wired in parallel and with an MPPT controller.
This setup will keep my new AGM batteries in good condition, as they were on my last boat, I am sure.
SV Elyse SM437 ...still on the hard at Gulf Harbour - weather !!
---In amelyachtowners@..., <jgermain@...> wrote :
Hello Alan and Richard,
I had GLASS batteries in my last boat. They require some very specific handling. I will use lead/acid in any cruising vessel I purchase.