Omnibuswoman Posted December 8 Author Share Posted December 8 19 hours ago, JohnMo said: It would be worth checking the voltage at both CUs they should be about the same. Check them at different times of the day to see the difference. How do I check this? Link to comment Share on other sites More sharing options...
Omnibuswoman Posted December 8 Author Share Posted December 8 19 hours ago, SteamyTea said: Is the PV and batteries on separate inverters? No, they are both on the same inverter. I have an app that allows me to choose how to use the batteries (to the extent that I understand what to do). I can charge them from the grid overnight at a cheap rate, then they will discharge during the day to supplement supply. Link to comment Share on other sites More sharing options...
JohnMo Posted December 8 Share Posted December 8 12 minutes ago, Omnibuswoman said: How do I check this? Multi meter? Link to comment Share on other sites More sharing options...
Omnibuswoman Posted December 8 Author Share Posted December 8 (edited) 34 minutes ago, JohnMo said: Multi meter? where do I place the probes?? Edited December 8 by Omnibuswoman Link to comment Share on other sites More sharing options...
G and J Posted December 8 Share Posted December 8 https://www.amazon.co.uk/ULTRICSÂ-Digital-Multimeter-Voltmeter-Ammeter/dp/B00TM0W8ZY/ref=sr_1_8?crid=2UE6HDXZIW6UV&dib=eyJ2IjoiMSJ9.GMoWxDsdxB9y2TrsYb5yPLNSR4dxqPPmAUDWFYk6KUQhFXkMt0BWaSL6Dk6hgLuGhfBly3GQQM1O7z3VqjYIlQ2CTDiDJ8PJvwjIhMM4roAqEEV7mYxFFFeg5mlgqtW40EsyiwATzNrFbj3Zc6fArKiqmp5fT77T5xmooA00yOEHi-tTE_UWBPVViRgI8xjO6fr-UbGt_TIXqJhiNIOaRtlkMA4Jqm45p8THswYH66YjBaqKw053BSWg0aBUKNeFYPUazagXmAMfTF7DVdVNnlPkDXPhnz9VM4JMSKQOyI0.d_GY3pwfwwqEi0bQQY4LpzXiFHqhWFsaRStjEGBXgvE&dib_tag=se&keywords=Multimeter&qid=1733659034&sprefix=multimter%2Caps%2C141&sr=8-8 would be an example. The picture even shows it set to the setting you will need. But please be careful. Or, [good idea alert!] having identified that your inverter is not operating correctly you can get the company in to honour their warranty (but a meter is a useful thing to have around). 1 Link to comment Share on other sites More sharing options...
Omnibuswoman Posted December 8 Author Share Posted December 8 3 minutes ago, G and J said: Or, [good idea alert!] having identified that your inverter is not operating correctly you can get the company in to honour their warranty (but a meter is a useful thing to have around). i think this will be my first port of call! Link to comment Share on other sites More sharing options...
G and J Posted December 8 Share Posted December 8 It appears likely that the inverter is tripping out as it believes the local mains voltage is too high. Before they start dismantling anything it might be worth getting them to check that the actual voltage at the inverter is close to the voltage reported on the app. If the fault is the voltage sensor then it’ll identify which bit to swap out. Good news is that you know how to check operation now. 1 Link to comment Share on other sites More sharing options...
Dillsue Posted December 8 Share Posted December 8 3 hours ago, Omnibuswoman said: How do I check this? Get someone who's familiar with doing this to show you where to measure, where to put the probes and which range to select. There's a fair chance of exposed bus bars behind the cover with 400vac on them that have got the potential to kill you and/or spoil your xmas. Link to comment Share on other sites More sharing options...
Dillsue Posted December 8 Share Posted December 8 (edited) 3 hours ago, Omnibuswoman said: The problem has clearly worsened the less load I have put on the system - Reducing load will increase the voltage, so 22 hours ago, Dillsue said: If you put a load on that phase, like an electric fire, it will pull the voltage down. Maybe add a kw or 2 of load to each phase when you want to test things Try that at the times you're getting the problem and see if it clears things up Edited December 8 by Dillsue 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted December 8 Share Posted December 8 First thing to learn, and you know a little bit of it already, is Ohm's Law. The second thing to know is the resistivity of cables, well metals really. https://en.m.wikipedia.org/wiki/Electrical_resistivity_and_conductivity Then, as others have said, how to use a multimeter. Bigger is better as the writing on the dial is bigger, or maybe that me just getting old. No need to buy an extra expensive one, I got one from Poundland, works well and the probes are pretty decent. Final thing to know, and this helps with PV as there are some quirks, is it he fundamental difference between AC (alternating current) and DC (direct current). There is a reason that people say play safely with DC. Though Topsy the Elephant was actually dispatched with AC, though there had been a long running arguement about which type of power delivery was the safer. Hopefully, all your AC side is covered by an RCD/RCBO. So your personal risk is low. 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now