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CDL

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  1. Okay, so I had a look at some of the data again. It seems to happen when the batteries are full. A large load is switched on (let us say for example a draw of -70 A) and you see a sudden drop in the battery voltage at the same time. Say from 54.49 V down to 52.88 V. Then there's a sudden reversal in battery current. Goes from -70 A up to +14 A. Voltage then simultaneously bounces up to say 56.8 V (sometimes as high as 58 V) and then there's a sudden drop almost immediately after that down to 55.5. So it seems to be something along the lines of the charge controller overshooting. This is on my
  2. H Coulomb, thank you so much for this. I will relay the info.
  3. Thank you so very much Coulomb. These are LifePo4 batteries - but I see on the link you posted that this can occur with both battery types. This is a friend's installation. I see on my own Victron installation, they battery voltage will sometimes throw up a very brief spike on a hot day when something switches on. It looks like a kind of "voltage bounce". And sometimes will go as high as 59.87 V. I think the same batteries combined with the Axpert may also be "bouncing" and causing the inverters to throw up an error.
  4. Hi guys, We have a series of Axpert 5000VA inverters. On a hot day, we have a situation where sometimes something switches on and then the inverters throw up a 03 (high battery voltage) error and the system switches off for about 30 seconds and then back on. Battery importer has been in and checked BMS parameters, et cetera. Problem persists. I suspect possible voltage bounce on the batteries but am not certain. Anyone got any ideas? Thanks in advance.
  5. CDL

    LifePo4 Charge Rate

    The MPPTS are rated at a maximum of 70A on the photovoltaic side and 100A on the battery side. There are two of them. The panels are set up East/West (a bit below 5 kW in each direction), which works well in this application because it means we start generating earlier and we keep generating later and we have a more even power generation curve. Mostly, the batteries don't receive more than between 60 and 80 A (in total in respect of both of them together thus 30 and 40 each); a lot of the time it is a bit lower as well. It all depends upon solar conditions and how much is being used by direct
  6. CDL

    LifePo4 Charge Rate

    About 9.5kw nominal rating of panels - on a good day will push 8.5kw. MPPTs are Victron. Yes re the batteries. One set is 180ah the other 200ah. Actual, not rated.
  7. CDL

    LifePo4 Charge Rate

    The system is 48V. The distributor says doubling the charge rate is fine because the capacity is double.
  8. CDL

    LifePo4 Charge Rate

    Thank you. Following your advice I spoke to them a few minutes back. They have suggested that I can use 120 amp as the charge current maximum for charging the batteries through all three stages in the normal course of events. They do suggest though that if I want to balance the batteries (if they go out of balance at any point in time) that I should then use 60 A maximum to charge them and then float them for a period of about 24 hours, which should then bring them back into balance. Apparently that this should not be required very often at all.
  9. CDL

    LifePo4 Charge Rate

    Thank you very much 20VT – much appreciated. That helps.
  10. CDL

    LifePo4 Charge Rate

    Actually, I had to go and look for them after your post above (lekker dom) and then went to find them at the distributor's website. See attached. I see the maximum charge rate that is recommended is 65 A. That is for one battery array. Presumably if I have two battery arrays, then presumably I should set the maximum charge rate on the inverter to 130A? Is the logic correct? Revov-LFP200C48VN-C.pdf
  11. Hi guys, I have a Victron Quattro mated to Canadian Solar panels and some second life LifePo4 batteries with their own BMS' supplied with the batteries. The batteries are in two banks of a nominal 180 amp hours each (one bank is in fact about 200 amp hours), connected in parallel. Using the Victron Remote Control interface, DVCC allows one to set a maximum charge current. I am getting conflicting advice as to whether a maximum charge current should be used with these batteries and if so, what that maximum charge current should be. I have been told anything between 120 A and 60 A. Yet read
  12. Many thanks guys – only logged on today again so didn't see these previously. I have "without batterylife" option, so that factor doesn't apply.
  13. Thank you Plonkster. Your assumption that I am using ESS is correct. I have noted that now that the batteries are at 57% and I have put the grid back on, it is doing exactly as you say. I am not sure why it was not doing this once the batteries got to 47% as the threshold for them is set at 45%. Will keep an eye on it and see what happens. Cheers and many thanks again!
  14. Hi guys, I have a Victron Quattro 10 kVA inverter combined with solar panels and battery array. I have a query as to how I can configure the application of the incoming solar power. I let the system use the batteries down to 45% overnight, even though grid is available (the remaining 45% is "saved" for grid outage situations, the 55% usually being sufficient to carry us through the night). What happens is that in the morning the incoming solar power normally exceeds the AC loads. For example, as I write this, we have incoming photovoltaic of 2 kW and we have AC loads of 474 W. What i
  15. Thanks Richard. Thanks Jaws. I have found someone good to help. An assessment of the installation reveals that its been very poorly done from the outset. And contact with Revov reveals that the installer blew the BMS. So, will get it sorted out. Starting by throwing away the Axpert units and putting in Victron. Do it properly and be done with it. Many thanks for the help and advice.
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