For the BMS on this bank I chose to use the simple and cost effective EDIT: Has Closed It's Doors to DIY's from Clean Power Auto.


There are fancier and significantly more expensive BMS products out there but very few are geared towards off-grid or house bank use and usually offer more features and complexity than may be useful on a boat. Elithion and many other companies make BMS systems and there are enough to make your head spin. Genasun also used to make a beautiful BMS, they sold to DIY's, but like Clean Power Auto they have since pulled out of the DIY market.


Are we starting to see a trend here? I no longer consult long distance on LFP design because owners refused to follow design criteria, Genasun stopped Selling to DIY's and then dropped LPF altogether, and now Clean Power Auto has pulled out of the DIY space. If you've done your research I suspect you know why this trend exists.


If you are still looking to build your own a good company, as an alternative, would be; Orion BMS



The HPBMS is the small PCB in the box. I cut shaped & routed a piece of high density phenolic to fit inside the Velleman box so the layout of the BMS could be done outside the box then simply dropped into it.


Additional items shown:


#1 Two 70A Cole Hersee RC-700112-DN SPDT 70A Relays. One for Alternator HVC and one for Solar HVC. (Ignore the relays in this image they were for layout and mock up only and are SPST not SPDT)


#2 Blue Sea Terminal Strip


#3 Piezo alarm buzzer 12V.


#4 Momentary re-set switch.