Kankama said..
Something odd here - of course. The 130 AH lithiums should be fine to run 25 amps, there should be no need to get three. The problem is somewhere else. It would help if we knew the type of Lithiums - maybe they are just bad batteries. I certainly know my Watt cycle 200AHs can deliver up to 100 amps as stated on the box - no worries with the anchor winch or inverter loads. Lithiums are great at running motors usually.
Maybe they didn't charge properly and are flat - the voltage curve on lithiums is really flat and hard to tell if they are depleted. If Kryspen has not updated the alternator then maybe this got fried initially and the lithiums didn't charge at all. Maybe take them home and charge one at home and try again.
I just read that there is solar too - so probably not charge - it could be a strange thing.
There are some anchor winches that do not like lithiums - Quicks IIRC. The electric motors are designed for less than 12 volts. So when connected up to lithiums (which don't do voltage drop like AGM or flooded) the motors get too HIGH a voltage. The Jabsco toilet may have some sort of voltage monitor to stop too HIGH a voltage running through it. Toilet wires are long and probably thin, so the voltage with the AGMs was probably about 11 volts and with lithiums it could be 13.5 still.
However AI tells me this will not be it, so maybe we are back to the lithiums and a shoddy BMS. When the connector is opened there could be a much hugher inrush current an the 25 amps pulled - maybe up to 50 or more for a microsecond. It would be a pretty terrible lithium not to be able to handle 100 amps, but if the BMS can only handle 40 amps, then the inrush current could certainly trip it - but what lithium would be so low in current delivery?
Kryspen could try putting another high load on the system - an inverter running something or the anchor winch. Do they work?
We need to know the specs of the battery and more about the system.
I did used inverter and there's no problem at all , it's 4000/8000 inverter, slight voltage drop but works ok ( used to power up my Watermaker.
Quixotic said..
I've lithiums and no problem powering my jabsco heads or my muir anchor winch. If the batteries went in, in May and its July you're having problems with the toilet, makes me wonder about length of time away from the boat, and whether its a heads problem independent of the batteries (ie just a coincidence). Assuming it's salt water flush, you can get salt build up around the impeller, if there's evaporation from the bowl while away for a long period. And/or the impeller can bind to the porcelain when not used for a lengthy period, or if it has been run dry. Best to put freshwater into the bowl and pump a little through when you're going to leave the head for a long time. I'd try running the jabsco directly off an AGM, and if its not turning willingly, pull it apart and make sure the impeller is OK. If it does turn willingly on the AGM, then that does suggest it is the new batteries, somehow. (BTW I'm assuming you've remembered to open the stopcocks etc 😉 and haven't got a blockage problem with a holding tank or somesuch)
Appreciate advice.
I live on my boat so there's no " away from boat ". Macerator pump pulled apart, inspected, all good. Lifting water with no problem.
After spending $ on lithium battery + victron DC DC charger + mppt I'm not going back to AGM or gell ( they are gone ).
I try upgrade wiring to 8wg size, maybe will help.
