LourensJB

Its is a 70 Ah 54 volt unit. I will do so - currently the unit seems to behave a lot better since the change in settings.

In line with Blue Nova instructions, I am using Absorption Voltage of 56.2V currently.

Is there a top "safe" limit to keep in mind or would the internal protection processes both in the battery and the Mutliplus kick in?

Good morning all - thanks for all the feedback. I must just maybe make a correction - to me as a noob asking a question without looking at the setup screens, is dangerous it seems - I used the word "Equalisation" while I should have used "Absorption". The default setting on the Multiplus 48/5000 for Lithium batteries comes up as : Repeated Absorption Time = 1Hr / Repeated Absorption Interval = 7 Days / Absorption Time = 1Hr Since getting the loss in performance over time, I have increased these settings now to: Repeated Absorption Time = 0.5Hr (Shorter time lapse between peaks) / Repeated Absorption Interval = 1 Days (Every day instead of 7 days)/ Absorption Time = 1Hr Since I cannot find specific info on what is advised for these settings for the Lithium battery I need to find out what the pro's/con's are of increasing the Absorption process to the intensity I have done now to try and recover capacity as quick as possible. There is already a huge improvement in individual cell voltages early morning compared to before making this change two days ago, so it seems to be a step in the right direction.

Hi all - first time post here 🙂 I have a 54 Volt Blue Nova battery approximately 10 months old now. It is controlled by a Victron Multiplus 48/5000 unit - age of installation approx 5 years. The available energy from the battery is constantly decreasing up to a point where it now disconnects the Multiplus while even being at 40-50% State of Charge. This is with an approximate continuous load of around 120watt overnight. Originally when new it could go down to below 5% SOC with such a low load, only requiring a big load for it to go into protection (Low Battery state) while still at say 20% SOC. I have a full island system being on a small holding and have a generator as backup but it does not auto-start. The island setup means that the battery is fully charged every day and drained to on average about 25% SOC overnight, infrequently down to 15% and lower. It never stays at that SOC for longer than a few hours - it is usually charged back up to at least 50% within 90 minutes - so chances of it getting damaged through prolonged discharge is slim. I have been advised by Blue Nova to allow for Equalisation charge which it does currently once a week (and has always been set like that) - we draw very low loads in the afternoons so the battery is fully charged daily. Does anybody else have the same experience with Lithium batteries? If so - how does one handle this? What is the safe Equalization repeat setting for Lithium batteries - will it do any damage to the batteries if set for "Daily"?

Tx for the input Wetkit... I will follow up this morning. According to the below however the wiring is correct. The logic to me is that this way it can sense what the PV Inverter specifically is contributing : Installation 1. Pull one of the AC wires of the PV inverter through the AC Current sensor. 2. Connect the sensor to the AUX or TEMP-sense input of an Inverter, Multi or Quattro in the same phase as being measured by that current sensor. 3. Configure the power range with the dipswitches. Select the power equal or higher than the maximum expected power. For example, with a 4kW PV installation, the correct dipswitch setting is 5kW. 4. Multi-phase installations: add one AC current sensor for each phase of the PV inverter. Wire it to the Multi in the same phase." (From http://www.victronenergy.com/upload/documents/Manual-AC-Current-sensor-EN.pdf)

Thanks for the input Wetkit... The system is wired according to A but the current sensor is in position 3 as shown here: ( http://powerforum.co.za/index.php?app=gallery&module=images&section=img_ctrl&img=31 ) As this only happens once the batteries has been fully charged (Multiplus not directing large current to the batteries itself) I will see if I can duplicate the error tomorrow when I am close to the system. The same thing happened today while I was out so I am just charging batteries now. I don't think I will have enough sun left to play with today still.

The reason I wnt this route is due to being a direct Eskom client in a rural area. We are being charged for network and support which is n9t lj ked to consumption so one cannot bring that fixed cost down with using less energy. In effect I have paid more than R4-30 per kwh before the latest increases. So yes it is very costly but it makes financial sense to go off grid completely. The way it is being connected is PVPanels - SB inverter - Load. Then from the other side: Batteries - Multiplus - Load. So in essence the MP and the SB is in parallel over the load. Not one before or after the other. I have a Victron Current sensor over the Live AC output. The basic setup was done by the suppliers technician here in Pta.

I am not sure if this has been covered in other threads here - if so please refer me to the correct thread. I have a new installation with a Sunnyboy PV inverter with a Victron Multiplus 48/5000 charge controller. It 8s up and running after loading the correct assistants and settings. What happens under certain conditions is that the PV inverter gets stopped via adjusting the frequency of the output power by the Multiplus. This is when demand has almost stopped or lowered significantly. The PV inverter then supplies only a fraction of what it could based on available sunlight. This is apparently normal. However when demand increases again through switching on appliances etc the PV inverter 8s not triggered to increase its supply and the Multiplus supplies from batteries. This will and has discharged the batteries far lower than what is safe for them while there is up to 3kw available via the PV Inverter. I can rectify this only by switching off everything and restarting the Multiplus and then the Sunnyboy and then apply load. How is this situation rectified and the Sunnyboy put into operation again automatically when demand increases? Any help or explanation would be sincerely appreciated.