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Off Grid CS6P-250 x 14 panels
We have inherited an old Canadian PV system with a small holding in East Anglia UK. The present setup comprises 14 panels, each CS6P-250 type. Wired 7S2P to a junction box on panels, then fed to MPPT epever ET6415BND 60 Amp controller. 8 batteries in 4S2P configuration, each 115 AH 12 volt. Inverter Pure Sine Wave power inverter unbranded.
Panels read 110 volts at the junction box and 107.5 volts at the MPPT controller terminal ( Via isolator) This was tested in the morning in bright sunlight but only at 4 degrees C. Previous reading Full midday sun October 22nd sunshine gave 136 volts at the junction box on the rear of panels.
Batteries are 2017 and read 8 volts at best. MPPT is not powering up and is possibly dead due to a lack of ventilation in the shed where housed ( Hot summer in 2022 would have reached over 40 degrees C ) Or could be Voc breaching 150 volts?
Load is only a small shop with a total of 10 LED lights, a till, and a weighing machine. Some power at socket outlets is needed to charge phones and mobile camping lights for the evening—maximum load 500 watts which would be required in low light conditions or evening for six hours.
My questions/queries are:
14 Panesl would appear an overkill at present.
Voc may approach 150-volt maximum .( Given a winter sunny morning at minus 5 Degrees C ), Thus killing MOSFETS?
The battery arrangement seems too light, given amount of panels.
If I charged the dead batteries charged at home, could I at least prove the rest of the system works prior to spending more than 2000 pounds on new batteries? Or is it like inheriting a stately home, which will cost us more and more every year?
The picture shows the shed contents as inherited.
Does anyone have any good advice please
Marrp
Panels read 110 volts at the junction box and 107.5 volts at the MPPT controller terminal ( Via isolator) This was tested in the morning in bright sunlight but only at 4 degrees C. Previous reading Full midday sun October 22nd sunshine gave 136 volts at the junction box on the rear of panels.
Batteries are 2017 and read 8 volts at best. MPPT is not powering up and is possibly dead due to a lack of ventilation in the shed where housed ( Hot summer in 2022 would have reached over 40 degrees C ) Or could be Voc breaching 150 volts?
Load is only a small shop with a total of 10 LED lights, a till, and a weighing machine. Some power at socket outlets is needed to charge phones and mobile camping lights for the evening—maximum load 500 watts which would be required in low light conditions or evening for six hours.
My questions/queries are:
14 Panesl would appear an overkill at present.
Voc may approach 150-volt maximum .( Given a winter sunny morning at minus 5 Degrees C ), Thus killing MOSFETS?
The battery arrangement seems too light, given amount of panels.
If I charged the dead batteries charged at home, could I at least prove the rest of the system works prior to spending more than 2000 pounds on new batteries? Or is it like inheriting a stately home, which will cost us more and more every year?
The picture shows the shed contents as inherited.
Does anyone have any good advice please
Marrp
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