Solar Inverter chargers- can the 220V ac be powered directly off of the PV?




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  1. #1
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    Default Solar Inverter chargers - can the 220V AC be powered directly by the PV?

    I've been wondering with Solar Inverter chargers like the Axpert Hybrid models how does the 220V ac inverter output get powered, can it run solely off of the PV on a sunny day?
    This model for example:
    https://www.sustainable-energy-solut...pt-220v-24v-dc

    Can they function like that without a battery connected?

    I'm assuming in the above scenario a battery connected to the system would help even out any PV output fluctuations and is the preferable setup?
    Last edited by Skylark; 2018/08/29 at 12:03 AM.

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    Default Re: Solar Inverter chargers - can the 220V AC be powered directly by the PV?

    Anyone?

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    Default Re: Solar Inverter chargers - can the 220V AC be powered directly by the PV?

    Quote Originally Posted by Skylark View Post
    I've been wondering with Solar Inverter chargers like the Axpert Hybrid models how does the 220V ac inverter output get powered, can it run solely off of the PV on a sunny day?
    This model for example:
    https://www.sustainable-energy-solut...pt-220v-24v-dc

    Can they function like that without a battery connected?

    I'm assuming in the above scenario a battery connected to the system would help even out any PV output fluctuations and is the preferable setup?
    Your assumption is quite correct.
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    Default Re: Solar Inverter chargers - can the 220V AC be powered directly by the PV?

    Quote Originally Posted by Fluffy View Post
    Your assumption is quite correct.
    Thanks, theoretically if the pv was in full sun with a cloudless sky and the pv array had sufficient output could the pv run the inverter and power a 220v AC device on its own with no battery connected?
    Last edited by Skylark; 2018/08/30 at 08:55 PM.

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    Default Re: Solar Inverter chargers - can the 220V AC be powered directly by the PV?

    Quote Originally Posted by Skylark View Post
    Thanks, theoretically if the pv was in full sun with a cloudless sky and the pv array had sufficient output could the pv run the inverter and power a 220v AC device on its own with no battery connected?
    Yes

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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    That particular model inverter would not function without a battery connected.
    There are inverters available (from the same manufacturer) that can work with or without a battery.

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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    My little kit gives 19.5volts direct off the panel, hence the need for a regulated supply.

    While they say you can run a load (12v fridge) directly off the MPPT (and it is 15% more efficient that putting it through a battery)
    they specifically say NOT to run an inverter directly from the MPPT.
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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    Quote Originally Posted by Tallhorse View Post
    My little kit gives 19.5volts direct off the panel, hence the need for a regulated supply.

    While they say you can run a load (12v fridge) directly off the MPPT (and it is 15% more efficient that putting it through a battery)
    they specifically say NOT to run an inverter directly from the MPPT.
    So you could run the fridge directly off a MPPT 12V output, that would probably need to be a MPPT designed specifically for that scenario?

    In most of these systems if you have a battery connected and there's full sun on the pv and you are using the 12v dc output and inverter to power devices does the charger inverter dynamically draw the energy directly from the pv or does it use the battery as a "reservoir" per say which is being constantly fed by the pv output.

    I'd like to understand how a system with an inverter charger and battery under full sun utilises the pv output vs the battery and if the pv under full sun and battery capacity is summed, ie say if using an inverter you can utilise more wattage than if it was nighttime and only drawing from the battery.

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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    All the boreholes on a friends farm is running only from the panel no batteries, 12 volt pumps but can take up to 48 volts. Running everyday, keep all the waterholes full

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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    Quote Originally Posted by Skylark View Post
    So you could run the fridge directly off a MPPT 12V output, that would probably need to be a MPPT designed specifically for that scenario?

    In most of these systems if you have a battery connected and there's full sun on the pv and you are using the 12v dc output and inverter to power devices does the charger inverter dynamically draw the energy directly from the pv or does it use the battery as a "reservoir" per say which is being constantly fed by the pv output.

    I'd like to understand how a system with an inverter charger and battery under full sun utilises the pv output vs the battery and if the pv under full sun and battery capacity is summed, ie say if using an inverter you can utilise more wattage than if it was nighttime and only drawing from the battery.
    Well, my MPPT has a DC port as well as a battery charging port. Power priority is the DC port if connected. Any surplus power will be stored in the battery. I assume the charging of the battery has a loss as it is not perfect efficient system .

    Since this is my first MPPT I dont know if this is normal or not.

    I dont quite understand your last Sentence. The inverter can only use power if connected to a load. The load would be the same regardless of power source. That said the inverter does use power when on, as it too is not a perfect system
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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    Quote Originally Posted by Tallhorse View Post
    Well, my MPPT has a DC port as well as a battery charging port. Power priority is the DC port if connected. Any surplus power will be stored in the battery. I assume the charging of the battery has a loss as it is not perfect efficient system .

    Since this is my first MPPT I dont know if this is normal or not.

    I dont quite understand your last Sentence. The inverter can only use power if connected to a load. The load would be the same regardless of power source. That said the inverter does use power when on, as it too is not a perfect system
    I was referring to if I had an over speccd inverter in terms of the battery size/output, batteries can power 3kva but it's a 5Kva inverter, under full sun could I run that inverter past 3kva(load on the inverter) due to the batteries and pv output being summed/combined?
    Last edited by Skylark; 2018/09/08 at 03:34 PM.

  12. #12
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    Default Re: Solar Inverter chargers- can the 220V ac be powered directly off of the PV?

    Axpert programming manual answers your questions concerning power output priorities and settings. Applicable to most inverters. Obviously loads can only be supplied to limit of inverter's Kva ratings
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