Why is my off grid system shutting down overnight?

Question

question

carlos-farfal asked Nov 22, '19

Why is my off grid system shutting down overnight?

Hi: 
I have an off grid system consisting of 6 270W panels, 1 Victron Phoenix of 500VA / 48V, a Blue Solar 150/35 48V regulator and an 8x100Ah battery bank in two series of 48V each. The loads are luminaires of a corridor (210W installed) that must be turned on when the darkness of the afternoon starts and off at dawn, however they go out between 1 and 3 in the morning. 
I checked the sizing and it is fine, what I don't know, is if there is any voltage parameter that is incorrectly configured in the inverter or regulator, and that causes the system to shut down, due to low voltage maybe. As a background, the maximum battery voltage during the day reaches 57.5V and the minimum voltage, when the charges are switched off is 37.44V. 
I would appreciate comments to someone with more experience in this type of configuration, to see if I can solve it. 
Thanks in advance,

battery charging Phoenix Inverter battery system voltage

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

carlos-farfal answered · Dec 04, 2019 at 06:25 PM

Last night I measured the batteries of two off grid systems, after it turned off completely. At sunset 9:15 p.m., the interior luminaires were turned on and the voltage was 51V. Then, at 1 am, the voltage dropped to 36V and the system stopped working. At that moment, we desconnected all the bateries bridges and proceeded to measure voltajes of each battery individually. Batt1=7V ; batt2=12V ; batt3=7V ; batt4=12V ; batt5=5V; batt6= 12V ; batt7=10V ; batt8= 12V

And other Off Grid System:

Batt1=10V ; batt2=12V ; batt3=12V ; batt4=10V ; batt5=12V; batt6= 10V ; batt7=10V ; batt8= 10V

Than you for advance. @Guy Stewart (Victron Community Manager)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2019-11-22T20:14:41Z

Guy Stewart (Victron Community Manager) answered · Nov 22, 2019 at 08:14 PM

When the system is shut off at 37.44V, check the individual voltages of each of the batteries with a multimeter and see if they are all consistent.

Write down the voltages and report back.

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 2 · 2019-12-04T19:56:28Z

Murray van Graan answered · Dec 04, 2019 at 07:56 PM

It does appear that the battery bank is not coping with your load. Further, batteries discharged down to between 7-10Vdc will certainly damage them. You definitely need a battery balancer, to keep all batteries at the same level. Ultimate solution would be to replace them with lifepo4 batteries

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 3 · 2019-12-05T05:54:29Z

loramoser answered · Dec 05, 2019 at 05:54 AM

is the inverter and it's fuse wired to the battery terminals, or to a Load terminal on the charge controller ?

1

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

carlos-farfal commented · Dec 08, 2019 at 03:15 PM

The inverter and its internal fuse are connected directly to the battery bank through a 6 mm2 solar cable. In turn, the output of the regulator is connected to the battery bank through a 6 mm2 solar cable

0 ·

question