To make the real comparison of AGMs versus flooded you must include the costs savings from the reduced engine or generator running costs. See pages 4-6 here:
Originally Posted by Mistroma
Lifeline AGMs come out as cheapest, but the I suppose you can prove anything with figures if you want to.
Graphs on link look exactly like ones on the spreadsheet I downloaded. Key point for me was that the costs were miles out for UK prices I could get. I entered data for power usage, battery prices and all other relevant data. The result persuaded me to go for T105s.
Originally Posted by sailinglegend420
I did say that everyone had different usage patterns and mine probably suit T105s. I have records of engine hours, wind-gen output etc. for last few years. I would need to check but am pretty certain that I only ran the engine for 2-3 hours just for charging in 2011. I didn't count the cost of running the engine when actually travelling. I assumed that any difference in fuel cost was minimal when using the engine for propulsion. i.e. Fuel usage to charge AGM or flooded aren't significant when motoring at 7 knots. Could be wrong of course.
I suspect that many people use this spreadsheet without updating all the relevant data (including battery prices).
The battery question is difficult but we have used standard (so called sealed) lead acid batteries for two years now .. deep cycled often.. if you take the plastic label off the top you will probably find regular filling plugs underneath . Ours needed about 1.5 Ltrs of distilled water after a year of use (not exactly maintenance free !)
I bought two gel batteries in 2005,second hand,from an electric car.One lasted a few months and died.The other is still in perfect condition,not just consinged to running the bilge pump but for the last two years its a lighting and bilge dedicated battery charged with an 18w solar panel
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