In the end there was nothing to be change not my alternator or shore charger , It was made to sound as if this was going to be a very costly job, I didn't know what Bms was last Sept, in Oct I started reading the DIY solar forum then took up reading the forum on lithium here, at first very comfusing, you need to change this and you need to change that , Both Sterling and Victron B2Bs have fully user-configurable settings and are therefore suitable.Ĭlick to expand.People make lithium sound like rocket science and its not. It is a good idea to have a switch isolating the panels from the controller, as sometimes you may want to stop charging, and to have 'float' at 13.2 volts - no float at all in practice.īest to avoid specific LFP settings. This may be a concern about keeping the LFP at full charge. My BMS provides this but I have to do a full charge occasionally to reset.Ĭompletely untrue as Noelex says. But to avoid the knees an accurate enough stage of charge reading is required. The charging curve is very flat but the voltage does rise steeply near full charge and fall steeply at low charge (the upper and lower 'knees'). In fact mid-range state of charge is preferred for a long life. They do self-discharge at about 3% per month at room temperature - like lead acid - but this does not cause sulfation. The first chargers with LFP specific settings were 14.6 volts or above - generally recognised now as too high. Many people, myself included, use 13.8 volts. Target voltages for ending bulk are generally lower than for lead acid. There should be no float (or a float setting of 13.3 volts or below which is effectively no float), no equalisation, no temperature compensation. LFP is mostly all bulk charging as stated here but a short period at absorption may be required by some systems to balance the cells. Mostly correct but some errors in my view. Īs a example mine are charge to 13.8v then drop to 13.5v He is right they don't like to float but with most mppt a " float " setting is needed which is why many have this setting low so in reality the batteries never reach a voltages where the lithium are 100% and on float, as in the same as LA. If you have a good size bank you would never need to go that low. You be pushing it at 90% and personally I wouldnt want to go down to 80 % , Well not if you want to get any long term use out of them. Then he talks about, ( you can discharge them to 98% ) , įor a start you can use MPPT with lithium many hundreds people do, that just alone get me wonder if he knows what he talking about. I not sure who Grey Nomads is, but just by the bit you posted I not sure I agree with his comment. There also links to Rod site sadly he not too well , Lots written on lithium and I suggest you read although it's quite a long threat the one here on lithium started by poey50, there some good stuff from people here who has build their own banks. The Grey Nomads ForumĬlick to expand.I don't pretend to be any expert on lithium,īoth the banks I built my mate and mine are going strong and working 24/7 every day for the last 9 months. How can i run AGM and Lithium Ion batteries together on solar. All the mainstream units don't work for lithium.ĪC to DC chargers must have a specific lithium setting." MPPT controllers cannot be used on Lithium batteries.ĭC to DC chargers must have a specific lithium setting. 98% discharged so you must monitor your consumption because they do not like being completely discharged to 0 volts. They deliver the full charge voltage from full charge until approx. Lithium battery voltages don't vary based on charge state. You must not float/trickle charge lithium batteries as they do not self discharge like lead acid and you will over-charge them. Lithium require a charger specifically designed for them, that supplies both a constant voltage and specific current from start to finish, and when the battery gets to a specific terminal voltage then the charger must completely shut off. "Charging Lithium batteries is completely different to lead acid variations. Can't the normal alternator charge the lithium battery? Do you agree with this guy (from the GreyNomads forum)who seems to know what he is talking about? I was wondering about how you would charge the lithium battery.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |