Which 5kw inverter can i buy just for backup? I will not be adding panels to this inverter and it will be paired to a 5kwh battery. I really don't want to get Sunsynk/Deye because i feel like i don't need all those features for a simple UPS system. Also i will be installing the inverter inside the house so a quiet one would be ideal. 

Problem I see with the above thinking is that UPS manufacturers have fallen behind in building UPS's that are clever. The Inverter companies with solar input "UPS" are a lot more intelligent these days, and in SA you now need to have UPS's that are clever to "dance" around our ever changing load-shedding schedules.

That makes the likes of Sunsynk/Deye a better choice, even if it is just to do UPS function. 

With lots load-shedding still available for the foreseeable future (3 - 8 years), you may as well invest in a system that you can add panels at a later stage.

A UPS with a flat battery when Eskom in Load-shedding = nothing. Add panels, and you actually have a solution that can survive Eskom.

49 minutes ago, phidz said:

Which 5kw inverter can i buy just for backup? I will not be adding panels to this inverter and it will be paired to a 5kwh battery. I really don't want to get Sunsynk/Deye because i feel like i don't need all those features for a simple UPS system. Also i will be installing the inverter inside the house so a quiet one would be ideal. 

At a good price point, the Growatt spf5000es is a good inverter for UPS type functionality. And in future you can add panels if/when the need arises.
The fan may be an issue if you use constant loads closer to the high end.
If you run mostly base loads the fan will not be an issue.

Edited March 6, 20233 yr by WannabeSolarSparky

3 minutes ago, WannabeSolarSparky said:

At a good price point, the Growatt spf5000es is a good inverter for UPS type functionality. And in future you can add panels if/when the need arises.
The fan may be an issue if you use constant loads closer to the high end.
If you run mostly base loads the fan will not be an issue.

Yes, Growatt spf5000es, I have two in parallel running for over 1 1/2 years, so far so good, no complains. But and I quote (Also i will be installing the inverter inside the house so a quiet one would be ideal.) be aware they are Just a bit noisy.   

sunsynk 5kw is silent but a bit pricey for a UPS type scenario.

4 minutes ago, WannabeSolarSparky said:

sunsynk 5kw is silent but a bit pricey for a UPS type scenario.

@WannabeSolarSparky Agree with you 100%,  Growatt almost 1/2 the price, also I don't like the fact of the extra neutral/earth bonding hardware needed with the Sunsynk. Growatt does it internally. 

8 minutes ago, Sidewinder said:

Problem I see with the above thinking is that UPS manufacturers have fallen behind in building UPS's that are clever. The Inverter companies with solar input "UPS" are a lot more intelligent these days, and in SA you now need to have UPS's that are clever to "dance" around our ever changing load-shedding schedules.

That makes the likes of Sunsynk/Deye a better choice, even if it is just to do UPS function. 

With lots load-shedding still available for the foreseeable future (3 - 8 years), you may as well invest in a system that you can add panels at a later stage.

A UPS with a flat battery when Eskom in Load-shedding = nothing. Add panels, and you actually have a solution that can survive Eskom.

Thanks for you response but i guess i didn't put enough background to my question. The UPS will be installed at a complex where you can't install solar panels. The best i can do is to have a UPS with no expectation of adding solar panels in the future. 

20 minutes ago, phidz said:

The best i can do is to have a UPS with no expectation of adding solar panels in the future. 

Today's situation is such that you can get intelligent solar inverter like Growatt, Axpert, Synergj, Mecer at the price of conventional UPS. You get the solar MPPT for free.

1 hour ago, Sidewinder said:

Problem I see with the above thinking is that UPS manufacturers have fallen behind in building UPS's that are clever. The Inverter companies with solar input "UPS" are a lot more intelligent these days, and in SA you now need to have UPS's that are clever to "dance" around our ever changing load-shedding schedules.

Since there's no panels involved, you don't need a lot of cleverness.

EG on my system I would create a single rule that tells it to charge from 00:00 to 23:59 every day. So when there's grid it charges the batteries, fairly quickly, and then keeps them charged until the grid goes down again.

So I take your point, but you don't need the smartest inverter in town for this purpose.

1 hour ago, Beat said:

Today's situation is such that you can get intelligent solar inverter like Growatt, Axpert, Synergj, Mecer at the price of conventional UPS. You get the solar MPPT for free.

by UPS mean an inverter and battery without solar input.

2 hours ago, phidz said:

by UPS mean an inverter and battery without solar input.

You forgot the the integrated battery charger and the automatic switch over that is needed to make an UPS.

6 hours ago, Beat said:

Today's situation is such that you can get intelligent solar inverter like Growatt, Axpert, Synergj, Mecer at the price of conventional UPS. You get the solar MPPT for free.

This is a major plus as said one need not use the PV at all. Trying to buy say a 30A AC charger is expensive. These all in one units are great value for money. 

If it was not for the 5kW size I would also look at the 2.4kw Averge. Their fans are not very noisy if I look at the 1.6kW unit I installed.