aandncaravan Posted January 22, 2019 Share Posted January 22, 2019 spirou - 2019-01-22 9:57 AM Don't have time to research much, just comparing Victron spec sheets LiFePO https://www.victronenergy.com/upload/documents/Datasheet-12,8-&-25,6-Volt-lithium-iron-phosphate-batteries-Smart-EN.pdf CYCLE LIFE (capacity = 80% of nominal) 80% DoD 2500 cycles 70% DoD 3000 cycles 50% DoD 5000 cycles So taking a standard 100Ah battery pack it is automatically downrated to 80Ah. If we still want 60Ah out of it, that goes right between the 2500 & 3000 figures above. Their new lead carbon battery: = 1000 cycles at 60% DOD = 500 cycles at 100% DOD https://www.victronenergy.com/upload/documents/Datasheet-Lead-carbon-battery-EN.pdf AGM supercycle = 300 cycles @ 100% DoD = 700 cycles @ 60% DoD https://www.victronenergy.com/upload/documents/Datasheet-AGM-Super-Cycle-battery-EN.pdf Prices are also available to anyone on their website. OK, they don't specify the lithium testing procedure, but if we believe them on lead-acid technology, perhaps they can be trusted on lithium? Spirou, They look good, but then Victron are three times better than the competition in the Lead battery market. They are also not the motorhome targeted offerings we talk about and have seen, 3 of which we saw that had suffered premature capacity loss. While Techie gurus may have created their own Lithium set-ups, most of the Lithiums going into motorhomes in the UK now are very different to the Victrons above. Two of them, for example have only a 2 year guarantee. One has a three year guarantee, but you have to have the Lithium installation inspected annually by the installer, otherwise warranty is void. You know as well as I there are budget wet batteries and Victrons, they are a World apart. I would be willing to bet there also are 'motorhome' Lithiums and Victron Lithiums that are also a world apart. As will be the support and maintenance. Even if the Victrons where as declared, costing £1,300 ea battery, it will still be cheaper and almost as efficient to install 12 x Yuasa L36 batteries, one after the other every two years, to get a 2,700 cycle life and 24 years of life time for the same money. That is without the huge £800+ installation costs UK customers are being charged on top of the battery to have these fitted. I don't get them at all, motorhome owners change the vehicle an average of every seven years, that is just 3 sets of decent batteries, or one set of super high quality Gels. Why would you want to spend the equivalent of 24 years of battery lifetime you won't ever see? In reality each Yuasa will probably last 3 - 4 years so £1300 of batteries could deliver 48 years worth of life time. You focus above on cycle and lifetime, so I have, but isn't even talking about nearly £1,300/50 years battery life just crazy? The 'mis-marketing' in the UK Motorhome arena, which was the subject of this thread, is very different to what is happening in the wider world lithium arena. Link to comment Share on other sites More sharing options...
plwsm2000 Posted January 22, 2019 Share Posted January 22, 2019 Not sure where that graph came from Allan, but the Y axis scale is x10^4 so that reads 30,000 cycles at 20% DOD (not 3,000) , 10,000 at 50% etc. As you said, without knowing how these figures were obtained, a pinch or 2 of salt might be needed. Link to comment Share on other sites More sharing options...
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