paulsabatier

Panel is built and tested. Contactors are mechanically and electrically interlocked. Timer to prevent the common reconnect flickering.

Great feedback Sir. Mechanical interlocked they will be. Site is usually unattended after hours.

A friend has a factory where the incoming municipality cables are regularly cut and stolen. When the municipality reconnects very often the phase rotation is incorrect. The genset and solar system are setup to sync and share with the Mains. The idea is to have an incoming DB board with the phase correction contactors and rotation sensing relays. Is it safe to have a pair of incoming contactors designated 1 & 2 with a pair of phase rotation and voltage sensing relays designated A & B. The output of contactor 2 is reversed A/C/B to the output terminals. Relay A picks up contactor 1 when the incoming rotation is correct. Relay B sensing is reversed and picks up contactor 2 when the rotation is incorrect. The coils of both are interlocked via the NC auxiliary contacts. This would ensure that the rotation into the main DB is always A/B/C regardless of the incoming rotation. Using 2 phase rotation relays & their NO contacts to only select the appropriate contactor when the values are in spec ensures it's fail-safe. Looking for better solutions or ideas.

Marked Solar to make identification easy https://www.pv-magazine.com/2024/11/06/australian-pv-equipment-supplier-says-new-bundled-conduit-improves-residential-rooftop-solar-install-times-by-20/

There are multiple sources for ignition of the arc https://www.acsolarwarehouse.com/news/solar-fires-dc-arc-faults-on-solar-systems/

A associate of mine has been approached to source an Engineer's report on a situation where a generator was connected to the top of an incoming breaker WITHOUT any isolation switches. The back feed has apparently damaged equipment upstream. The extent of the damage has been determined and need to be explained in the report. The appropriate fees will be paid for by the parties concerned. Please contact me on 082 413 4614 [email protected]

What is the acceptable Earth to Neutral Voltage in a 3 phase 400 Volt workshop/office installation? The UPS supplier wants 2 Volts AC max between incoming Mains Neutral & Earth. The substation is located 130 meters away and the cable is under concrete & tar. I have not been able to establish whether an earth conductor is connected to both ends or are they relying on the armouring to complete the earth.

Hi Chris Factory warrenty has lapsed. About 5 cycles of 40 % DOD on each during vehicle demos. Repack to 48 volts without a problem. The BMS is 24 volts.

2 Nanowin 24 volt 600 Ah batteries for sale. Comprises of 16 x 300 Ah lithium Iron phosphate cells in series parallel connection, enclosed in a galvinised steel case. The batteries have been used in an electric vehicle project for the platinum mines which has been cancelled. The 100 Amp chargers are also for sale. Offers at R80,000-00 each not VAT

Hi Wetkit Unfortunately battery behaviour is not a linear function. Have a look at these documents for some clarity on depth of discharge, cycle life, recharge time, watts per cell. The reason I have posted these links is I work with these products daily. http://www.odysseybattery.com/documents/US-GPL-AM-003_0906.pdf http://www.odysseybattery.com/documents/US-ODY-TM-001_0411_000.pdf http://www.enersys-emea.com/reserve/pdf/EN-GPL-AM-005_0911.pdf http://www.enersys-emea.com/reserve/pdf/EN-GPL-SG-004_0911.pdf