
About Wi-Fi Configuration
Q: Why can't I find the Solar-WiFi* signal on mobile devices?
A: Normally Solar-WiFi* signal could be searched right after inverter has powered up. But Solar-Wi-
Fi signal will disappear when EM connects to internet. If changes to the setting are required,
connect to the router for change. If you can't find the WiFi signal or connect to the router, then
please try to reload Wi-Fi (please refer to "3.1 Wi-Fi Configuration").
Q: Why can't I connect Solar-WiFi* signal on my phone?
A: The Wifi module can only connect to one device at a time. If the signal is already connected to
another device at the time for some reason, you cannot connect to the signal.
Q: Why does the Wi-Fi module fail to connect to network after I choose the right router
hotspot and enter the right passwords?
A: It's possible that there are special characters not supported by module in the hotspot
passwords. Please modify the password to consist of only Arabic numerals or uppercase
/lowercase letters.
About Battery Operation
Q: Why does the battery not discharge when grid is not available, while it discharges
normally when grid is available?
A: On the App, off-grid output and back-up function should be turned on to make battery
discharge under off-grid mode.
Q: Why is there no output on back-up side?
A: For back-up supply, the "Back-Up Supply" on PV Master App must be turned on. Under off-grid
mode or when grid power is disconnected, "Off-Grid Output Switch" function must be turned on
as well.
Questions & Answer (Q&A)
Note: When turning "Off-Grid Output Switch" on, don't restart inverter or battery, otherwise the
function will be switched off automatically.
Q: On Portal, why battery SOC has a sudden jump up to 95%?
A: This normally happens on when BMS communication fail on lithium. If battery enter float
charge, SOC will be reset to 95% compulsively.
Q: Why battery cannot be fully charged to 100%?
A: Battery will stop charge when battery voltage reaches charge voltage set on PV Master APP.
Q: Why battery breaker always trip when starts it up (Lithium battery)?
A: The breaker of lithium battery normally trips for following reasons:
1. BMS communication fails.
2. Battery SOC is too low, battery trips to protect itself.
3. An electrical short-cut happened on battery connection side. Or other reasons please con-
tact After-sales for details.
Q: Which battery should I use for BH?
A: For BH series inverter, it could connect lithium batteries which have compatibility with BH
series inverter with nominal voltage from 85V to 450V. Compatible lithium batteries can see on
battery list in PV Master APP.
About PV Master Operation and Monitoring
Q: Why can't I save settings on PV Master App?
A: It could be caused by losing connection to Solar-WiFi *.
1. Make sure you have already connected Solar-WiFi* (make sure no other devices connected) or
router (if connected Solar-WiFi* to router). APP's homepage shows connection well.
2. Make sure you restart inverter 10mins after you change some settings because inverter will
save settings every 10 mins under normal mode. We recommend to change setting parame-
ters when inverter is in wait mode.
Q: Why are the data displayed on the homepage different from the param page, like
charge/discharge, PV value, load value or grid value?
A: The data refresh frequency is different, so there will be a data inconformity between different
pages on the App as well as between these on portal and App.
Q: Some columns show NA, like battery SOH, etc. Why does that happen?
A: NA means App does not receive data from inverter or server because of communication
problem, such as battery communication, and communication between inverter and the App.
High Power Fluctuation on Battery Charge or Discharge:
Solution:
Check if there is a fluctuation on load power.
Battery Does Not Charge:
Solution:
1. Make sure BMS communication is OK on PV Master.
2. Check if CT connected in the right position and to right direction as on the user manual page 15.
Possible Problems During Operation
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