Posted September 21, 20159 yr Inverter with 2 x 100Ah batteries I queried with Voltronic why the battery charge indication was 0V, they replied that no pv panels were connected. Added 2 x 255W Yingli panels in parallel, shows PV voltage 30V, charging current is still 0V.
September 21, 20159 yr Check batteries are wired in series for 24V (2x12V) if its the 24V inverter... Regars Mark
September 21, 20159 yr The Axpert 3kVA model's MPPT operating range is 30V to 66V. Yingli panels VOC is 38.7 V but its PMax is 30.6 V @ STC. Under what they think is normal operating conditions PMax drops to 27.9 V for those panels. The Axpert was designed around panels with lower voltages. The voltage from 1 panel or 2 panels in parallel is too low for the 30V threshold and 2 panels in series could exceed the 66V ceiling. Try different panels in series that have a lower VOC between 20V and 30V should do if you do not have cold winters, or two 50V panels in parallel. I see there is an absolute max of 75V on the MPPT so depending whether you are a risk-taker and on how cold your winters are you could connect your Yinglis in series but 38.7 x 2 = 77.4 V and if you are in a cold area that could climb to about 85V.
September 21, 20159 yr Author It's the KS model with a PWM charge controller 50A, PV array VOC is 60V - Yingli panel VOC is 37.7V, Pmax is 30V @ STC. 6 of these panels can be connected in parallel, none in series (as mentioned, the VOC would be exceeded). Missing the point, the charging current should be displayed, whether AC or PV or a combination of both.
September 21, 20159 yr Author Extract from manual although formatting has been omitted. Take 2K/3KVA inverter as an example to select proper PV module. After considering Voc of PV module not exceed 60Vdc and max. Vmpp of PV module close to 30Vdc or within 30Vdc ~ 32Vdc, we can choose PV module with below specification. Maximum Power (Pmax) 260W Max. PV module numbers in series 1 > 30.9 x 1 = 30 ~ 32 Max. Power Voltage Vmpp(V) 30.9V Max. Power Current Impp(A) 8.42A PV module numbers in parallel 6 > 50 A / 8.42 Total PV module numbers 1 x 6 = 6 Open Circuit Voltage Voc(V) 37.7V Short Circuit Current Isc(A) 8.89A Maximum PV module numbers in Series: 1 PV module numbers in Parallel: 6 Total PV module numbers: 1 x 6 = 6
September 21, 20159 yr I see KS has no minimum voltage so you should be getting a current reading assuming you have direct sunlight on the PVs. The fact that you getting a voltage reading would seem to indicate that everything is wired up correctly.
September 22, 20159 yr Author Received a firmware update from Voltronic, software reported 'UPS not ready for firmware upgrade' and pv panel icon disappeared.
September 22, 20159 yr Author Waited about 3 hrs and tried again, new firmware loaded OK. Now have pv panel charging current indication on panel and Watchpower.
September 22, 20159 yr Author They supplied the software, upgrade is via RS232 or USB. https://onedrive.live.com/redir?resid=B6E11F173DB13421!1811&authkey=!AE0RxAH4OKsdHI0&ithint=file%2cpdf
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.