I have installed a SSR to control a heater element. The reason is that I want my batteries to stay at a certain level (e.g 80%) and use the surplus solar energy for the heater element. My Node Red installation on my Cerbo monitors the solar input and the batter SOC and adjust the SSR accordingly. After installation I notice a “humming” sound from the inverter when the SSR is restricting power, obviously because of the cutting the relay does. My question is if this could harm my Multiplus inverter or reduce the lifetime.
What kind of SSR is it and what voltage are you using to control it?
Are you using the PV energy from the panels directly or the battery voltage?
0-10 volt to control the SSR.
The surplus energy is drawn from the inverter (220 V).
SSR looks ok … How much power does your inverter … and your heating rod have?
Inverter is 5000w and heating element is 2000w
Christian
Those SSRs, depending on types (especially the triac based ones, which I believe this is one of them), have some RC snubber circuits inside and they could interfere with the normal function and make the inverter create those sounds.
No harm will be done to the inverter.