Raj174 ✭✭✭


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Solar Expert


  • diallodjeri
    Also the system is a complete off grid.
    August 8
  • diallodjeri
    Yes my estimate consumption is based on hourly basis and it should be 3kwh to 3.5kwh during the day 1.5kwh to 2kwh at night, but I just want set up enough panels that can generate up 5kw just to give enough cushion to myself otherwise my consumption will never reach that amount even during the peak time 12pm to 4pm.
    August 8
    • Raj174
      answered below
  • diallodjeri
    Yes, you right the Radian is 48v, but that shouldn't be a problem because SimpliPhi has 24v and 48v. 
    What is the difference between simple inverter and inverter/charger. So the role of a charge controller is just to protect your battery from over charging not from over discharging?
    August 8
    • Raj174
      An inverter just converts DC power to AC power. An inverter charger does the same but has the capability of charging the battery from either a generator or the grid, depending on whether it is an off grid only inverter or a hybrid inverter. (Like the Outback Radian hybrid inverter/charger which can connect to the grid increasing features and options.)

      The main role of the charge controller is to charge the batteries using the available PV power generated by the solar panels. They come in various sizes based on the amps they can supply to the battery, just like a regular battery charger. If set up correctly it should not overcharge the battery. Normally the PV power supplying the charge controller should not exceed it's output capability in amps. Example: a 48 volt 80 amp charge controller, would be 48V times 80 amps equal 3840 watts. So about 4000 watts of solar panels for an 80 amp controller. However, since the main role of the charge controller is to charge the battery, the amp output should not exceed the maximum amp input of the battery. Example: the SimpliPhi 48 volt battery has a maximum charge rate of 33 amps, 2 in parallel would be 66 amps, so an 80 amp charge controller would need no more than 1800 watts of panels to charge one Simplphy battery or 3600 watts to charge 2 Simpliphy batteries in parallel. The wattage amounts include power losses due to hot panels.

      The output amps of the charge controller can be limited by a setting in the controller to allow for more PV input power than is necessary to charge the batteries, but this is not usually done because it will waste any power generated by the solar panels above what is needed by the battery and the loads on a sunny day.

      Protection from over discharging is usually a function of the inverter since it is using power from the batteries, by means of the LVD (Low Voltage Disconnect) setting in the inverter.

  • diallodjeri
    Do I still  have to worry about the size of my battery as long as I have a good charge controller? My understanding was that the charge controller will protect you battery from overcharging.
    August 2
    • Raj174
      When designing a solar power system, the battery size is determined based on the loads it needs to supply. The battery you have chosen is a 3.4 kWh lithium iron phosphate battery, and you can use about 80% of it, or about 2.7 kWh, from dusk till a couple of hours after dawn. That's about 12 hours, so 2700 watt hours divided by 12 is 225 watts per hour average. If that doesn't meet your needs then a bigger battery is necessary. However once you have decided on a battery, then you size the PV array to meet the charging requirements of the battery. The maximum charging amperage of 3.4 kWh LFP battery is 33 amps. That would require an array of about 2200 watts including heat losses.
      A larger array may be installed, but the charge controller will have to be set to limit the amperage output. The split array is handy in this respect as it will give you a higher production in the morning and afternoon and lower production at noon time. I hope this is an adequate explanation. If I can help further, let me know.

    • diallodjeri
      Thank you for the explanation.
      Some expert said that you should buy as many panels as you can effort. My total consumption would not reach 5kwh even at the peak time, but I just want to install an array that generate 5kw in order to give enough cushion to my self. The peak of my consumption should be between 12pm and 4 pm and in Mali where I'm setting up the system is sunny there all day and every day.
  • codger47
     Raj174 :

    Thank you for the information;that's the kind of thing I had hoped it was.

    No, I have not rung the company responsible. During the setup after installation they were most unhelpful with the setup paperwork. What should have taken me literally ten minutes took a week. I am NOT criticising the product; that I'm very happy with,so far , but really too early to tell

    I had not realised that members would not be familiar with the brand. I will drop in from time-to time, to see what's round

    August 6
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    August 3
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    July 30
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    July 13
  • djohnyvonne
    Do you have an email that I can send that permitting packet to?
    July 9