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Everything posted by Vince85

  1. Hi sgs. I have seen this a couple times and there are one or two things to keep in mind. The UP5000 battery is designed to output around 2.5KW (50A discharge as indicated in manual). This can cause some confusion because a user will read 5KWh and assume that the battery can output 5000W. Once the load exceeds this value, it will cause a sharp voltage drop (even when it is only a momentary "spike"). So what tends to happen is that the inverter picks up this "voltage drop" and assumes that the battery has reached its "point back to grid" and then gets stuck waiting for the "point back to Battery" set point. Also note that when this happens, the battery voltage will pop back up as soon as the inverter transfers to grid (removes the load from the battery). I understand that you mention that the load is linear so this should not be a problem but I figured it best to have this presented for clarity. Having the back to grid voltage at 48V will leave your Lithium battery SOC rather high (probably around 75%). I have changed mine to a lower value to allow the inverter to make use of more of the stored power. See the image attached, it indicates that the battery can operate between voltages of 44.5V to 53.5V so allowing your inverter to draw from the battery to a voltage of 46.5V should not cause any issues. This does change the depth of discharge that your battery is operating under and would give you more usable wattage while the grid is available. Should this be the preferred solution, then it is important to note that you will also then have less reserved energy available should you experience a power outage at night time. You are welcome to contact me directly for a more detailed look at you situation. https://mecadon.co.za/wp/
  2. The Sunsync might be a good option for your needs. It is also approved for grid tied use by SA governments. It's a true Hybrid and comes with all the Wi-Fi communication devices for remote access to the system. They can be dynamically set up with various power scenarios and kan be expanded in a modular manner (Parallel inverters). They have user friendly touch display and are cost-effective compared to similar quality True Hybrid inverters. They are easily found in 5Kva version and 8Kva version.
  3. You are welcome to contact me privately for more information. I am an installer in Cape Town so I am familiar with the local requirements. 076 052 0050 or www.mecadon.co.za
  4. I believe that this table you referred to above simply indicates the maximum amount of Kva you are allowed to "feed-in" to the grid. This does not necessarily limit the actual maximum production of your intended system. Think of it as two separate parts of your system. One part being the production for use plus excess for grid "Feed-in" and the second is only the amount allowable to "Feed-in" to the grid. For example: If you have 4000wp production capability (amount of panels power) and you are using a 5kva SunSync inverter, then you will need to set up the software to only export (feed-in) to the grid at a maximum rate based on your utility line capacity (for 60A supply 3500Watts is maximum) while you are still able to produce more for self consumption. Also note that produced power will be used on-site first (includes charging battery) then the excess power available will be allowed to be fed to the grid. I hope this helps.
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