My setup is; 4x385W panels on the roof in paralle; a Synapse 2.4Kw inverter and 2 AM4 Hubble batteries 24v in paralle.

I have added a Hubble Riot monitering device via the cloud all is looking good BUT...

when the voltage drops below 24 volts the alarm comes on and stays on for untill the AC picksup or the Sun starts to charge the battery.

Alarm can run for more than an hour.

Today we have a very sunny day and I expected to see the solar pannels driving up the battries but a lass, The Pannels seem to switch off and back on according to the monitor.

I'll try and add a graph to show the switching, I want to add a third battery but if the inverter is dumping load then I will be wasting my resourses.

Remember is this peach of a day no clouds, so why is the pannels dumping the load/switching off.

Anyone with take on my issue.

Edited March 21Mar 21 by Leee

1 hour ago, Leee said:

My setup is; 4x385W panels on the roof in paralle; a Synapse 2.4Kw inverter

Could you please confirm the model number of the inverter, and the make and model of the panels? And then confirm please whether you definitely have four panels in parallel to each other.

Just from some general Googling, if it's the synapse 3.0+ Off-Grid inverter, the MPP Range is 30-115VDC. But if I look at the Max Power voltage of some 385W solar panels, the electrical parameters show Vmp of only just over 30V for example at NOCT, up to 35V at STC (example 385W JAM60S20 365-390/MR).

All speculation, could be something else, and I might be running ahead of the issue without knowing the true facts, but if you've got a setup like that, then some shading or hazy skies, or heat build-up could cause the panel Voltage to drift out of MPPT operating range. I'd look at changing that to a 2S2P configuration, two strings of two in series, and then those two strings in parallel to each other.

Thanks for the reply, the inverter is a Synapse 3.0+, the invoice has it 2.4Kw hybrid solar invert 24V - 1000w mppt

There are 4x 380w canadian Solar mono half cell module on the roof. 6mm cable was use in the installation.

What you say about heat may be the root cause, I have not heard the fans for a while. I have opened the unit and both fans

have been replaced with new ones but still not comming on, have left the inverter open to remove heat, was fairly hot.

13 hours ago, Leee said:

There are 4x 380w canadian Solar mono half cell module on the roof. 6mm cable was use in the installation.

This doesn't confirm the question above: Are these panels connected all 4 electrically in parallel to each other? For that matter, considering the upper limit of the MPPT Range (30-115VDC), could it even be that they are all 4 connected electrically in series? Both of those configurations could be problematic. I think it's the first question that really has to be understood in full before it makes sense to look at anything else. It is not clear, not known with certainty based on what you've said so far, whether the panel set's Voltage is matching to the MPPT range in your installation. Do you have a wiring diagram you can post, or can you ask your installer? Maybe a spec sheet for your panel as well or the actual model code of the panel to go with it?

13 hours ago, Leee said:

What you say about heat may be the root cause, I have not heard the fans for a while. I have opened the unit and both fans

have been replaced with new ones but still not comming on, have left the inverter open to remove heat, was fairly hot.

I was referring to the heat of the panels on the roof, not of the inverter, so that could be a separate issue. But if you can confirm that the panel configuration can be changed to a 2S2P (Two-Series, Two parallel), then the possible Voltage fluctuations with panel temperature would be less of an issue. The main issue is that in the worst case your MPPT input Voltage could be too close to the upper or lower limit of the MPPT range, so any fluctuations could push you out of the range.