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title: ECU | Help Center
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1. [Help Center](https://support.yottaenergy.com/knowledge)
2. [ECU](https://support.yottaenergy.com/knowledge/ecu)

# ECU

- [What is the UID of my ECU?](https://support.yottaenergy.com/knowledge/what-is-the-uid-of-my-ecu)
- [What is the frequency of your Zigbee communication?](https://support.yottaenergy.com/knowledge/how-do-i-connect-the-ecu-to-wifi)
- [I have set-up and powered on the ECU and there is no communication between the ECU and the microinverters. Why?](https://support.yottaenergy.com/knowledge/i-have-set-up-and-powered-on-the-ecu-and-there-is-no-communication-between-the-ecu-and-the-microinverters.-why)
- [Will the microinverters be automatically detected by the ECU after connection?](https://support.yottaenergy.com/knowledge/will-the-microinverters-be-automatically-detected-by-the-ecu-after-connection)
- [I have connected the ECU with and ethernet cable, yet I don't seem to be connected to the internet.](https://support.yottaenergy.com/knowledge/i-have-connected-the-ecu-with-and-ethernet-cable-yet-i-dont-seem-to-be-connected-to-the-internet)
- [How many solar modules can an ECU reliably communicate with and demonstrate power production?](https://support.yottaenergy.com/knowledge/how-many-solar-modules-can-an-ecu-reliably-communicate-with-and-demonstrate-power-production)
- [I see black lines on the ECU LCD screen, how do I resolve the issue?](https://support.yottaenergy.com/knowledge/i-have-a-site-where-the-utility-will-not-allow-excess-power-back-into-the-grid.-do-you-have-a-function-in-the-ecu-to-prevent-power-reinjection/exportation)
- [I have an ECU and I see -W or -Web on the screen, what does that mean?](https://support.yottaenergy.com/knowledge/i-have-an-ecu-and-i-see-w-or-web-on-the-screen-what-does-that-mean)
- [I have replaced a defective microinverter, do I need to use the EMA Manager APP to enter new microinverters in the ECU?](https://support.yottaenergy.com/knowledge/i-have-replaced-a-defective-microinverter-do-i-need-to-use-the-ema-manager-app-to-enter-new-microinverters-in-the-ecu)
- [Can we use Zigbee antenna extensions?](https://support.yottaenergy.com/knowledge/can-we-use-zigbee-antenna-extensions)
- [Can I use any CTs with an ECU?](https://support.yottaenergy.com/knowledge/can-i-use-any-cts-with-an-ecu)
- [The location of the main panel and the solar sub panel is longer than the CT leads, How can I extend the CT leads that go to the ECU?](https://support.yottaenergy.com/knowledge/the-location-of-the-main-panel-and-the-solar-sub-panel-is-longer-than-the-ct-leads-how-can-i-extend-the-ct-leads-that-go-to-the-ecu)
- [How far from the microinverters can the ECU be placed? How far from the site's wireless router?](https://support.yottaenergy.com/knowledge/how-far-from-the-microinverters-can-the-ecu-be-placed-how-far-from-the-sites-wireless-router)
- [Can microinverter systems provide MODBUS protocol?](https://support.yottaenergy.com/knowledge/can-microinverter-systems-provide-modbus-protocol)
- [The ECU can connect to a max of 100 microinverters. What if I have 101 microinverters? DO I need a second ECU?](https://support.yottaenergy.com/knowledge/the-ecu-can-connect-to-a-max-of-100-microinverters.-what-if-i-have-101-microinverters-do-i-need-a-second-ecu)
- [How do I install CT?](https://support.yottaenergy.com/knowledge/how-do-i-install-ct)
- [How do I connect the ECU to Wifi?](https://support.yottaenergy.com/knowledge/how-do-i-connect-the-ecu-to-wifi-1)
- [My customer recently changed their router or internet provider, how do I reconnect their ECU-R or ECU-C to the internet?](https://support.yottaenergy.com/knowledge/my-customer-recently-changed-their-router-or-internet-provider-how-do-i-reconnect-their-ecu-r-or-ecu-c-to-the-internet)
- [What is the difference between ECU-R and ECU-C](https://support.yottaenergy.com/knowledge/what-is-the-difference-between-ecu-r-and-ecu-c-1)
- [Can I access an ECU-R in the local area network?](https://support.yottaenergy.com/knowledge/can-i-access-an-ecu-r-in-the-local-area-network-1)

See less ▼

- [General](https://support.yottaenergy.com/knowledge/general)
- [Gateway (ECU-R/C)](https://support.yottaenergy.com/knowledge/gateway-ecu-r-c)
- [MicroInverters](https://support.yottaenergy.com/knowledge/microinverters)
- [EMP](https://support.yottaenergy.com/knowledge/emp)
- [ECU](https://support.yottaenergy.com/knowledge/ecu)
- [App](https://support.yottaenergy.com/knowledge/app)

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