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Solar Installation


Frans Ackermann
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Looks heavy are you running on a single phase or 3 phases?

Let's see 600 * 16W = 9600Wh or near enough 10kW draw X 2.5 hours = 25kWh just for lights...

For the Aircons you probably should budget the 3k8W X 2 X 2.5 hours = 19kWh and how many servers are there and what are their consumption, then I guess you have network infrastructure, switches? VoIP phones? link to the outdoors/internet? everything that consumes some electrons to a lesser or larger degree and you'll have to come up with numbers, lets assume only 1 server, consuming, lets say 800Wh, that's then, 2kWh for the 2.5hours, so now we're looking at 46kWh battery capacity and inverter, if its single phase, probably 20kW, presumably its 3phase, though, assuming you can balance things out, then 3 X 7kW capacity would probably cover you, still, you'd be looking at LiFePO4 based energy storage or, if you can afford it and are expecting a long life, the LTO based energy storage would be best.

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17 hours ago, Frans Ackermann said:

What is the best. Lithium or Caps?

Capacitors are not suitable for this application.

As above, it will be a considerable system, both battery and inverter. So it will be spendy.

Do you really need all the lights during a blackout? Perhaps only a third of them (say one phase) for security?

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One of the most common remarks you will see in these forums is: first optimise your energy usage BEFORE investing in expensive new solar/UPS systems.  This looks like a classic case.

As Coluomb said, look at the lights.  Perhaps even put is a separate "emergency lighting" circuit with just a few bulbs.  I don't know your setup, but I have never seen a server room with 600 x 16W LED lights.  Added bonus: you will proportionally reduce the heat load that the air conditioners will have to get rid of.  Almost all of the 9.6kW going to your lights end up as heat.

Your air-conditioners are very old (an inefficient) R22 nits.  Consider replacing them with modern R410A inverter units - it will probably save you more in UPS costs than the air conditioners will cost.

One other point - other  posters have assumed 2 hour loadshedding durations.  Remember that stages 5-8 are 4 hours at a time

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