Hi,
I've been lurking here in the group for a couple years now as the topics are interesting and sometimes give me ideas but not commenting much.
But I thought I might add an option here as I had a similar situation where I wanted to get a bank at lower cost and the lithium batteries can sometimes seem somewhat prohibitive in price for large banks. I went with a sealed marine battery. You can find reputable group 31 sized 12V with 100+ AH for about $100 a piece. For a 48V 300+AH bank, that would be 12 batteries for $1,200. As long as they are sealed marine/deep cycle batteries they should work fine especially and without requiring any of the special chargers and/or accessories which can be significant additional costs.
It does require some research to find reputable brands at reasonable prices but it can save you a lot of money for equivalent power as long as the motor that you are planning to use doesn't require particularly high output. Even then you may be able to compensate by just increasing the size of your bank. But these batteries are typically larger and heavier than an equivalent lithium bank so you will also need to be extra careful about bank placement and how it affects it's seaworthiness.
On Thursday, June 3, 2021, 3:56:00 PM PDT, Dan Pfeiffer <dan@pfeiffer.net> wrote:
I don't have first hand info on this but I do know of one installation on a 13,000lb monohull that just upgraded from Chevy Volt batteries to a bank made from the 280AH LiFePo4 cells that are currently very popular and have been discussed here. A single 280AH bank replacing a a bank of four of the 48V Volt (apr. 200AH) The report was that the new battery configuration is performing much better though I don't have any metrics. But the recommendation was that the Chevy Volt batteries were not worth considering with better options now available at competitive costs.
A 48V 280AH bank from the Eve or LeiShen cells will cost between $1700 and $2000 USD including a BMS (like a Daly). A similar sized bank from Chevy Volt batteries will be about $500 for each 48V 50AH unit. So that's about $3000 for the same capacity but the BMS will be more complicated I think. And those are not new cells but probably have a lot of life left and might be a good interim solution if you can find a good deal on 2 or 3 of them. They are more easily scaled with the 48V units. But they run at a slightly lower voltage than the LifePo4 cells I think.
Dan Pfeiffer
A 48V 280AH bank from the Eve or LeiShen cells will cost between $1700 and $2000 USD including a BMS (like a Daly). A similar sized bank from Chevy Volt batteries will be about $500 for each 48V 50AH unit. So that's about $3000 for the same capacity but the BMS will be more complicated I think. And those are not new cells but probably have a lot of life left and might be a good interim solution if you can find a good deal on 2 or 3 of them. They are more easily scaled with the 48V units. But they run at a slightly lower voltage than the LifePo4 cells I think.
Dan Pfeiffer
On 2021-06-03 10:31 am, Carsten via groups.io wrote:
Scouting for a useful and low-cost battery bank, I would like to know - are some of you using a used EV car battery (50-80% remaining) for powering your boat ?If so, how ?I would like to wait to spend BIG bucks for a large new bank, so this might be an alternative, until the battery technology has come up at a higher level.Cheers,Carsten
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