Re: Converting my Amel 54 to lithium batteries: what I did, what I like and what I don't like (after one year of full time live aboard use)

Scott SV Tengah


Thanks for the reply!

Regarding your ML disconnect relay, which model are you using? For their disconnect relays, I only see 120amp max

Or did you use this charge disconnect? If so, any idea how I could use it with my system? 500amps may just be enough! The VE.BUS BMS load disconnect sends out 27v (more or less) when all is good and goes to open circuit when there is a problem with the batteries and the load needs to be disconnected. The other option, as someone suggested, is to buy THREE Victron BP-220 and attach one to each 25.8v pair. I presume that would give me 660 amps total?

Regarding your solar setup, any idea how many AH per day you average? Curious how that compares to our setup. We have a bit more rated capacity and we're doing parallel as noted before.  Also, do you have any concerns with your MPPT getting wet? We definitely use that wet locker for...wet items. 

The Victron Quattro also allows you to limit the input on both the 230v inputs. I leave the genset at 50amps but adjust the shore power as appropriate. That was very useful in Greece when we were "plugged into" someone's house circuit. Limiting it to 8 amps prevented constantly tripping their circuit breaker. :)

Regarding your shop vac'ing the engine room, we all get our kicks from somewhere I guess! My joy is in using the electric kettle and the microwave when I'm too lazy to do a proper meal and not having to fire up the genset.

To figure out SOC and charging voltage, I just played around. For example, my Mastervolt Alpha Pro2 set at 27.5v absorption will stop charging at about 90-93% SOC as reported on the Victron BMV-712 monitor. As you probably know, lifepo4 has very stable voltage until you hit the "knees" at near 0% SOC and 100% SOC. So you just have to play with it. I bet at 26.8v absorption, it'd be just about right for long term storage/docking.

I probably sound like a Victron rep, too, but like you, I just continued with choices made prior. My ecosystem lock-in with Victron started with the BlueSolar MPPT, which ironically I don't love!

2007 A54 #69
SV Tengah

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