Hi. I have a domestic system running at 48v with 24 panels and 2 x Axpert 5Kv. This set up works fine for everything I have in the house except for a heat pump that I have recently installed to heat the swimming pool. Once running the heat pump uses about 2Kw of power almost constantly, switching on an off automatically. This consumption is fine, as I will put it on during the 5 hours of the day when we have most sun and are generating around 5Kw constantly.

The only problem is that the heat pump seems to have a very high consumption peak as the heat exchanger engages and disengages automattically. Every time it does this I see a peak power demand of 14,990 watts (15Kw). This causes the inverters to switch immediately to Line mode because their maximum output with solar is 10Kw for 5 seconds. When the Axpert switches to line mode like this it stays there for 10 minutes before returning to Battery mode (solar) - this is a default hardware config. My question is if there is any way to avoid this switching with some kind of device installed in the circuit anywhere in the house to compensate for these momentary peaks. Not sure if it's possible to do this with a capacitor or something, or a starter battery set.

Does anyone have any advice?

Thanks.

The right capacitor should reduce these peaks.

https://en.m.wikipedia.org/wiki/Motor_soft_starter

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On 13/03/2016 at 11:11 PM, incagarcilaso said:

When the Axpert switches to line mode like this it stays there for 10 minutes before returning to Battery mode (solar)... 

I hate that too. Our patched firmware reduces this 10 minute period to 2 minutes, which seems ample.