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isetech

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  1. I had the same problem today ... I connected a 5 kva RCT inverter to a socket outlet (as a temp. supply to test and setup the unit before delivering to site) ... because the neutral and earth are bonded at the inverter output ... it will trip the mains earth leakage feeding the socket outlet ... so to setup the unit ... I removed the neutral earth bridge (which will be reconnected before the unit is delivered to site).
  2. My ASC switches off everytime there is load shedding ... bit of a pain because it is inked to my lights in the house (use it to switch lights on/off when we are on holiday) ... I have to press the button after load shedding to get the lights to work. Tried to connect one of site the other day ... just out of range ... so I fitted a standard timer. I am trying to figue out why the ASC will not connect to a Alcatel-lucent ... I suspect the IT fellas have blocks the wifi from connecting to random devices. Took both units back to my workshop and they link to my wifi and my phone.
  3. I busy working on a site which has this setup (I didnt install the system ... cleaning up and checking a few things). I am waitng for the solar installer to produce a COC ... a visual check ... indicated that a more indepth investigation be carried out. Simple things like sharp metal parts where the panel was cut to install wiring (no gommits installed) NO indicator lights on output (essential DB) and the labeling not clear. Solar DC wires running in the same trunking to the sub DB's ... 1 trunking for all wiring ... battery/PV/input/output ... not even a 2 compartment.
  4. A question with regards to overloading an inverter. It seems to be a normal practise to install an inverter ... lets say a 5 kva with more than 25 amps of load connected to the inverter ... with a note ... if the power goes off just switch off some of the deivices and switch on the devices you want to run ... in most cases during the day when nobody is home the solar is charging the batteries and providing enough power for the 25 % load being consumed. What are the implications of doing this ... I see many installtions have 32 amp circuit breaker protection for a 5 kva unit ... will
  5. I was gonna go with a US2000C for the Temp. 1 inverter stand alone system until the 3 in parallel are ready to connect ... however as I learn more about batteries (what happened to the old days of just buying a 105 amp/hr Deltec deep cycle battery and be done) I realised it wasnt an option for a 5 KVA unit not even just for a few small essential loads ... I was ready to order the US3000C this morning to use the temp. and then buy an addtional battery and use it for another site ... which I might still do ... however after reading the spec sheet I decided to do a little more research ... create
  6. Application : 5 KVA RCT inverter RCT : 5KVA Voltage : 48 VDC Rated : 98 amps DC @ 4000 watts current required from the battery = 98 amps DC ( 200 amp hours recommended ... but assuming this is the recommendation for a lead acid battery or other batteires like the pylontech with a C 0.5 rating) @ 5000 watts on the output = 5000 / 230 = 21.74 amps (AC side) If you have a 3500 wh (72 amp/hr capacity) battery which can only sustain a max value of 1800 wh (37 amp/hr) If the battery could produce 3500 wh / 48 VDC = 72.92 amps. If the battery can only
  7. Simple you connect the inverter supply via the main DB which has earth leakage protection ... you fit a changeover switch on the output of the inverter and fit and earth leakage unit and all the circuits will be protected or You dont fit a changeover switch because you install a system with only 1 x 5 KVA or smaller and dont need to worry about a changeover switch ... so you connect the inverter via the main DB earth leakage through a 32 amp MCB and fit an earth leakage unit at the output of the inverter. The question ... Is it that simple and what are the implications o
  8. Looking at the big picture ... type of load being supplied ... is it just a few electronic devices ... TV's ... routers ... alarms ... if so why not a modified sine wave ... high frequencey inverter and 48VDC ... 2.4 kwh (50 amp/hr) lithium battery ... no problem. However ... if we talking ... fridges ... aircons ... pool pumps ... heat pumps etc ... then a pure sine wave ... low frequency ... 48 VDC ... 9.6kwh (200 amp/hr) would be the ideal setup. Disclaimer: Learning by the day ... please feel free to correct any of my posts if I am talking kak.
  9. I have a 5kva ... 4kw inverter and considering the same option and going to be adding another 2 x 5KVA units to the mix ... was planning to have 3 x 2.4 kwh lithium batteries. The system is being upgraded from 12 x 105 amp/hr deep cycle enertec batteries ( I didnt install the system ... just relocating and upgrading ... the enertec deep cycle batteries lasted around 4 years then blew out ... high heat and rotten egg smell ... it was a mess) The way I worked out that I could use a 2.4kwh - 48VDC x 100 amp/hr = 5040 kmh ... 20-50 % DOD x 0.5 = 2.5kwh. I would think the question
  10. There is a US3000B and a US3000C battery I am trying to figue out differnce ... other than the price and DOD (B - R 18490.00 ... 80 % DOD ... and the C - R 18450.00 ... 95% DOD) and why the C which has a better DOD is R40 cheaper?
  11. Just a note with regards to geysers ... it generally takes around 1h20min to heat up a 150 lt with a 3 kw element ... if you choose to reduce the size of the element like I have to 1 kw so that I can run my 5 kva generator and switch the changeover switch without having to go around switching off stuff ... then using a timer to limit the geyser operating times ... you could find yourself sleeping out with the dogs. It is a tricky bussiness getting the temperature settings and timer to work under all circumstances ... a trip to the beach on a Saturday morning could result in a midday col
  12. Anyone tried this product ? https://www.mustsolar.com/
  13. This makes sense ... copied and pasted. Contactors are typically built for and used in 3-phase applications where a relay is more commonly used in single phase applications. A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.
  14. Now the trick is to figue out how to fit all the electrical components into one DB within the SANS regulations ... I dont want a changeover/bypass panel ... a suppply DB ... an inverter DB scattered all ove rthe walls. I want to install one DB with all the components required in one enclosure with indicator lights and partitions if required. I have an 80 amp supply (25 mm supply cable) but only 3 inverters rated at 22 amps each ... total 66 amps ... there are no essential and non essential ... everything is connected to the inverter ... this system has been operational until the batt
  15. I downloaded and read it ... very informative ... thanks.
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