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Alternative to Synerji/Axpert inverter


Shortcircuit
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I'm looking for suggestions/recommendations to replace my Synerji Hybrid.  I have considered Victron, Goodwe and SunSynk but can't quite work out whether they can be set up the way that I want.  I also do not want to change the solar panel configuration (2 x 72cell panels in series with 3 strings in parallel) giving me 1600W.  I have dedicated power sockets to power all my comms, entertainment and fridges as well as feeding all my lighting (LED). The system is set up to run off solar/battery (SBU) but will switch to mains at 20% battery discharge (50V) if mains is available or run until cut-off if mains is not available.  I initially had an Axpert but the solar charger failed fairly quickly. I replaced it with the Synerji (Must clone) but the solar charger has now also failed after just 20 months.  I was quite impressed with the Synerji (if a bit noisy) and it worked flawlessly until the solar charger didn't startup one morning when the sun rose.  I currently have a 5kW 48V unit but a 3kW will be more then adequate as well.  I would like to stay with a 48V unit (lead acid batteries) as this gives a lower current drain than a 24V option which is far kinder to the batteries.  Any suggestions as to a drop in replacement that is also locally supported for spares/repairs.

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3 posts with the same question. 

I have no idea why no one wants to give a suggestion.

I already made a suggestion in the other thread you created asking the same question. 

Changing your string to 6 panels on one string should not be a complicated task and you really are limiting your options by not considering that. 

The sunsynk inverter is a good option which allows for scalability should you want to expand it later.

Would really like to know why you don't want to reconfigure the panels. Are they in different locations with different orientations? If they are all installed next to each other it should be a simple exercise to reconfigure them. 

Edited by Achmat
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56 minutes ago, Achmat said:

3 posts with the same question. 

I have no idea why no one wants to give a suggestion.

I already made a suggestion in the other thread you created asking the same question. 

Changing your string to 6 panels on one string should not be a complicated task and you really are limiting your options by not considering that. 

The sunsynk inverter is a good option which allows for scalability should you want to expand it later.

Would really like to know why you don't want to reconfigure the panels. Are they in different locations with different orientations? If they are all installed next to each other it should be a simple exercise to reconfigure them. 

Thanks for your suggestion and it is still an option but I have a multifaceted roof and the panels arranged in pairs on different parts of the roof that face true north hence the reluctance to change configuration.  Do you know what Sunsynk local support is like?

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11 minutes ago, Shortcircuit said:

Thanks for your suggestion and it is still an option but I have a multifaceted roof and the panels arranged in pairs on different parts of the roof that face true north hence the reluctance to change configuration.  Do you know what Sunsynk local support is like?

Local support is getting better. I have the 8kw unit and have no complaints. 

@Vassenhas the 5kw unit with 3 strings at different orientations. Only thing extra you would need is a micro inverter for the third string. 

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5 hours ago, Vassen said:

If you want to stick with your 2S 3P orientation then there is very little you are going to be able to use in terms of hybrid string inverters as these require a fairly large startup voltage of around 125V, more than your 2S panels are going to give you. 

The only other non-axpert type option you have, that I know of, is the victrons.... but that's going to cost you. You can get a victron 100-15 mppt for each of the 2s panels. 

Maybe another option is to look at just replacing the mppt with a micro-inverter or victron mppt and then continue using your existing synergi for the backup loads. 

OK, so I am leaning towards a Victron MultiPlus 48/3000/35 coupled with a Victron Smart Solar MPPT 150/35.  Roughly double the price of an Axpert/Must clone but if it lasts longer than 3 years then I will be scoring anyway. What other Victron kit will I need to be able to install and do basic configuration/management of the system.

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