March 7, 20242 yr Hi guys, hope you can help me make sense of something please Apologies in advance if below writing is hard to read, just trying to state some facts - we have a Deye 8kW inverter - up to now our whole house was connected on load side (UPS?) - our swimming pool circuit at times contributes to about 6kW load (2 x 1.1kW pumps, heat pump, salt water chlorinator, etc.) - I decided that above pool circuit needs to be moved off the inverter and back on the grid as non-essential load - I wired a separate DB board with the pool circuit on and fed it from the grid - these grid wires also feed the Deye inverter BUT the pool load still shows as a load from the house on the inverter? Did I do above correctly? Is it a setting i missed? Could it be because of the CT coil? Many thanks for your advice much appreciated Thanks Ant
March 7, 20242 yr 26 minutes ago, anthonyhugo said: BUT the pool load still shows as a load from the house on the inverter? If moved correctly, it should show as a contribution to the figure above the house-icon load (instead of to the UPS load which is where it would've been before.) 26 minutes ago, anthonyhugo said: Could it be because of the CT coil? Correct, this is beneficial since it still allows you to run the pool load off excess solar (via zero export to CT) without worrying about tripping your inverter. If you want to test for certain, power off your main house breaker(s) and see if the pool stops running when the inverter kicks in.
March 8, 20242 yr Author Many thanks @JayMardern, hope this looks OK (please see attachment)? And yup when we have load shedding or if I flip the main grid breaker the pool circuit has no current Question please: suppose A=essential load and B=non-essential load, if A+B > 8kW, will our inverter trip or only when A > 8kW? Thanks Ant
March 8, 20242 yr Looks perfect. And correct, Essential (plus SmartLoad/Aux if applicable, though not in this case) exceeding the rating is what will cause tripping. (So your 'A' is all that matters here). Non-essential will just be supplemented by grid when exceeding the max; but with the CT in place and zero-export enabled, any excess solar will still power it - so win-win. Edited March 8, 20242 yr by JayMardern
March 8, 20242 yr 50 minutes ago, anthonyhugo said: Perfect thanks! Most welcome, One additional consideration: tripping can also be triggered by the battery exceeding it's rating/settings: the fault reported on the inverter when tripping will tell you whether it's a DC overcurrent (battery) or an AC overcurrent (inverter). If you share your battery model numbers we can check that your battery bank can handle the full 8kW.
March 8, 20242 yr Author Hi I've got 4 x of these?: Dyness 5.12KW Lithium Battery BX51100 Much appreciated!
March 8, 20242 yr @anthonyhugo, I'm sure those Batteries will out supply the inverter. So nothing to worry about there. You need to just be aware that the 8kW is only applicable when there's another source of energy, e.g. Solar. So at night, with Load shedding, you will only be able to draw +- 6.5kw (Mine trips at 128A from the battery). It looks like your CT coil is in the right place, it should be before your non-essential load as seen from the grid side. Test it. Switch on the pump, and observe the PV production, your PV production should rise by an additional 4kW. If not enough PV, the balance will be drawn from Battery/Grid, depending on you settings
March 11, 20242 yr They're rated for a recommended maximum 0.5C continuous (or a short-term 0.75C peak) which means (depending on how the BMS limits current - the LiBMS screen can tell you more precisely) you have a theoretical peak limit of 0.75 * 4 * 100 = 300A; and a recommended continuous limit of 0.5 * 4 * 100 = 200A from the batteries; whereas the inverter itself won't invert beyond 8kW - or around 160A from the battery bank. So even keeping within the recommended battery-draw maximum of just 0.5C and leaving a bit of room to spare on top of this (to cater for imperfect parallel wiring/batteries with slightly different resistances/etc - we seek to avoid max'ing this), the batteries will still comfortably out-supply the inverter's DC-battery current maximum of ~160A-ish max. @Sidewinder is right: 4 of these in parallel won't trip in your configuration; even if running entirely without grid/solar. On 2024/03/08 at 1:59 PM, anthonyhugo said: Hi I've got 4 x of these?: Dyness 5.12KW Lithium Battery BX51100 Much appreciated!
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