I have a heat pump that has displayed some random issues for a while and I’ve not being able to figure out why … until may be now …
I have an EasySolar 5K in a parallel setup with an external CT where the house is on AC-out and the heat pump on AC-in
I’ve just been able to reproduce an issue where the soft starter on the heat pump detects an alarm when I switch on a load e.g. the oven.
That’s causing problem because it stays in alarm mode for 5” and won’t start the compressor causing an incident on the heat pump.
I’ve done some tests
charger only - Not causing issue
limiting the inverter to 1K - still causing the issue
Has someone experienced such interference?
Now how do I figure out
if it’s electrical or electromagnetic interference?
if the EasySolar is the cause or the Emerson starter too sensitive?
If Victron says nothing wrong with our equipment the issue is with the heat pump and the other side says nothing wrong with us the issue is with inverter how do I get out of this situation and find a solution?
Yes that’s my parallel set up so both AC-in and Heat pump are on grid and the CT is before on the grid line.
ESS no injection. I’ve changed the set point from 25W to 50W but to no effect.
The Emerson is a CSS-32U
And whilst the heat pump is idle, if a load on my house comes in at around 1kW it will light a red led and the green will blink meaning: Message: Motor connection error Remarks: check wiring of R, RC and S terminals
If the load is switched off, after a delay of 5” the alarm disappears
I’ve now done several tests today and so far it can be repeated
Note: my inverter humms and the noise varies depending on the load e.g. switching oven on. Just did a test and that’s the case whether I‘m on or off grid. Although the humming is not as loud as when off grid. Not sure if it’s relevant
Given my serial number being HQ2220, is the PCBA retrofit merely for noise or could it cause of my issue?
Do you have peak shaving on?
Is the system set up to loads on input and output?
What is your input current limit set to? Is it more or less than the expected total load?
The house is on output and the PAC on in (parallel setup with an external CT)
The input current limit is 50A and my house is far from consuming that. The heatpump consumption is normally 3-5K so 15-25A
After rewiring so I can isolate the EasySolar from the grid and do some further tests it appears that
if PAC is on grid whilst EasySolar is cut off from grid (and as such house) switching on loads has no effect
if PAC and EasySolar are on grid, switching on loads causes alarm on the soft starter
So I suppose I have an electrical issue rather than electromagnetic one.
Now how to establish whether EasySolar or softstarter is at fault … ?
Has someone had a similar issue?
Could a galvanic isolator fix this issue?
I replied earlier “above minimum SOC only” is ticked and no limit for import/export
but may be I’m not answering your question … if the case what do you mean?