Have a 5kva 48v inverter. When the DC battery switches off the inverter will lose all the settings and go back to default settings.

Has anyone ever found the solution to this problem?...

Clean it... 😁😁

Seriously, please provide more information. Answering the following might help:

• name and model of inverter

• does it lose settings even when connected to the grid?

• etc.

This usually comes down to how the inverter stores its settings.

On most decent inverters, settings are saved in non-volatile memory, so even if the battery is disconnected, it should NOT reset. If yours is resetting every time the DC is off, then there’s likely an issue.

Common causes:

• Faulty memory (EEPROM) or control board – this is a big one

• Firmware issue or low-quality inverter

• Internal backup component failure (some units use small capacitors or backup circuits)

• In rare cases, unstable DC supply when shutting down

A failing memory board can actually cause the inverter to revert to factory settings repeatedly

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What you can try:

• Update firmware (if the model supports it)

• Check if there’s a proper shutdown sequence (some cheaper units don’t store settings unless shut down correctly)

• Make sure battery voltage isn’t dropping too quickly when switching off

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Reality check:

If it’s one of the lower-end / older models, this is often not worth repairing — the control board replacement can cost close to a new unit.

👉 We supply and install solar systems across SA, focusing on reliable, properly tested equipment with good after-sales support. A big issue we see is cheaper inverters failing like this after a few years — especially with memory and stability.

You can check options here at x solar
https://xsolar.co.za/product-category/inverters/hybrid-inverter/

Yes I have cleaned it it's now clean of dust had taken the picture before I did anything to it...kkkk

On the data plate it's written

Model name : Inverter 5kva-48vdc

Brand name New Horizon (see attached data plate and picture).

When it's on grid it doesn't lose its settings.

Only when there is no grid and the battery switches off it goes to default settings, so am now afraid it will charge the battery using wrong default settings.

21 hours ago, Can said:

When it's on grid it doesn't lose its settings.

Only when there is no grid and the battery switches off it goes to default settings, so am now afraid it will charge the battery using wrong default settings.

Thanks for the response. Do you know how old this inverter is? I suspect that it might have a "button" battery to provide backup for the (guessing...) SRam (if it was manufactured pre 2010ish), and that battery could now be discharged. If so, just replacing it with a new battery might solve the problem.

In the words of @Coulomb , "You've got a clone". Not sure if a solution is at hand for this.

3 hours ago, Sidewinder said:

In the words of @Coulomb , "You've got a clone". Not sure if a solution is at hand for this.

Thank you all for the valuable information... it's a 2019 model and the control board doesn't have a small 'button' battery...

18 minutes ago, Can said:

t's a 2019 model and the control board doesn't have a small 'button' battery...

OK, let's dig a bit deeper:

• Have you powered it up again after cleaning the insides?

• If "yes", have you left it on for an extended period of time and confirmed that it is still resetting to default after restarting?

Electronics can overheat when covered in dust, and this could have affected the non-volatile memory. If rebooted after a good cleanup, and allowed to settle for some time (during which a hidden backup battery could have been recharged...), it might just work properly again...

Another thought - is the rear of the LED/LCD display accessible - it is quite possible that a small button battery could be hidden inside this display compartment.

Last thought (at this time...) - Most inverters require an "Accept" or "Save" confirmation after adjusting settings - when adjusting your settings, did you actually "save" the changes in some way? Apologies for asking such a simple question, but this is easily overlooked.

Thank you so much for all this information @HennieL .

I managed to find someone who said I should replace the IC5 24

On 2026/04/01 at 6:58 PM, HennieL said:

OK, let's dig a bit deeper:

• Have you powered it up again after cleaning the insides?

• If "yes", have you left it on for an extended period of time and confirmed that it is still resetting to default after restarting?

Electronics can overheat when covered in dust, and this could have affected the non-volatile memory. If rebooted after a good cleanup, and allowed to settle for some time (during which a hidden backup battery could have been recharged...), it might just work properly again...

Another thought - is the rear of the LED/LCD display accessible - it is quite possible that a small button battery could be hidden inside this display compartment.

Last thought (at this time...) - Most inverters require an "Accept" or "Save" confirmation after adjusting settings - when adjusting your settings, did you actually "save" the changes in some way? Apologies for asking such a simple question, but this is easily overlooked.

Thank you so much @HennieL . I was told by one to change IC5 C2404 on the control board, as it is the one responsible for the settings.

Am now looking for the IC and will update as soon as I try this solution.

Thank you all, we managed to change the IC5 circled with red on the attached photo, it is related to the EPROM. Now it is working well and settings are remaining...

Am forever grateful to @HennieL and @Sidewinder be blessed...