In einem 25 Jahre alten Toyota LC sind 2x AGM Varta 95Ah Verbraucher verbaut, die über einen Sterling B2B und von der 320Wp Solar und Victron 100/20 geladen werden.
Für eine kurzfristige Nutzung ist ein 230V Inverter verbaut.
Doch wenn die beiden eBikes geladen werden sollen, dürfte nur AGM nicht ausreichend sein.
Daher die Frage - hilft hier ein AGM- Lithium-Hybrid System. Auf nur Lithium wollte ich derzeit nicht wechseln.
Wie müsste das Hybrid-System gestaltet werden, ohne das sie sich gegenseitig zerstören, durch zB unterschiedliche Innenwiederstände und geht es überhaupt (ala Hymer BOS LE300 System).
Was müssen im positiven Sinne dann BMS und Balancer können.
Gerne erwarte ich eure Tipps für ein upgrade meines treuen Vehikels.
It would be impossible to mix both batterie types on one DC bus. But you could create a second DC bus using an orion DC/DC charger to transfer energy from the AGM part to the Lithium, keep the AGM for the DC loads and use the lithuim part only for the inverter. You need to give more info about your setup for us to judge correctly of what to do.
The Hymer BOS LE 300 is sold as Hybrid AGM + Lithium.
But offered in vehicles like new Sprinter or Crafter with a lot of control electronics.
The stories what will be charged first and reloaded first is different.
The fact that the system resistor of the Lithium battery is smaller means for me charged first.
But what the BMS of the Lithium battery will do, when fully charged or currrent is flowing, I have no idea.
hallo,
ein hybrid-system ist zwar moeglich, allerdings nicht unproblematisch.
das problem dabei ist, dass zuerst die li-akkus entladen werden und danach erst die blei-akkus und beim laden sind auch zuerst die li-akkus wieder voll und erst danach die blei-akkus. dazu kommt noch, dass die ladeendspannung der li-akkus niedriger ist als die der blei-akkus, was zur folge hat, dass jedes mal das bms die ladung abschalten muss oder die blei-akkus nicht voll werden.
es kommt auch noch dazu, dass die blei-akkus nicht so schnell geladen werden koennen, wie die li-akkus. bis 90% soc ist das eher kein problem, aber fuer die letzten 10% werden noch mehrere stunden benoetigt.
If I understand you correctly you are planning to put both types of batteries in parralel? Considder a few facts. Both charging curves (relation between state of charge and voltage) are completely different. Let me give you some details. A lifepo4 has a steep drop and rise of voltage near to full and empty respectively. A charger will utilize that rise near full to switch from bulk to absortion. In absorption the charger switches to a very low current to slowly top of the battery till a certain voltage. So constant current at bulk and then a lower constant current to top of until a voltage threshold. An AGM will have a more steep voltage ramp over the whole SOC range. Therefore both battery types will have a crossover in voltage during charging making the charge current change during charge. But AGM needs a float system. In other words both batteries have diffrent needs in charging sequence. Therefore any form of “hybrid” system on one DC bus is in my opinion a very weak compromise. I would avoid it at all times. I understand companies making these compromises to fill up holes in the market. But from an electric engineers point of view it is a no-no. Feel free to shoot more questions. In a lithuim charge sequence the charger will also switch to constant voltage at the end and waits until the remaining charge current drops under a certain setpoint. The AGM will make sure that current never drops under the threshold. The Lithium’s BMS will only cutt-off charging over an absolute voltage ceiling, and cutoff the discharging under a absolute minimum voltage to keep cells somewhat healthy. The BOS system is acting as a charger in 2 directions. During charging it will be interpreted by the victron system as a DC load when configured correctly. But during injection back into the AGM i would be suprised how the system will interprete it. Because it is an internally managed system I wonder how the mppt will react to it during weak sunlight. When both AGM charging currents are combined into reloading the AGM + active DC loads + Inverter. How does your system is setup? What victron products do you have?
