₦airaland Forum

Solidtech Power Inverter

Mesh Inverter

feflo:
Powerstar

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For those who find the price of regular inverter out of reach, i will be sharing info on how you can convert a UPS to an Inverter. I have done a couple of these conversions and have even sold to people and the result is quite heart warming.

That's good

1. Get a working UPS (preferably an APC), remove the battery if its available

2. Open the casing(outer cover)

3. Locate the buzzer on the board and yank it off.

4. Get a good DC fan(readily available in Lagos) and position it close to the transformer/panel as seen in the picture. You will need a silicon Gum to fasten the Fan to the base of the UPS

5. Carefully look for a DC point on the panel and connect the two cables from the DC fan to it. Note that if the UPS is 24VDC, you will need a 24VDC fan and if 12VDC, you will need a 12VDC fan.

6. Mark out the position of the fan on the outer casing and cut it. This is to allow the fan to extract out the hot air from the UPS

@feflo Thanks for the detailed guide. Please, how do we know when the battery gets to 50% dept of discharge?

bobojoshua:
@feflo Thanks for the detailed guide. Please, how do we know when the battery gets to 50% dept of discharge?

Knowing the depth of discharge(DoD) or the State of Charge(SoC) is a very difficult question to answer because it depends on so many variables. The type of battery(FLA,AGM, Gel etc), even the age of the battery is also a factor. I will answer your question purely from experience, at 11.6v -11.8v, some inverters cut off indicating a 80% DoD. Some go lower than that, some high end inverters even cut off at 12v (Note that i am using a 12v battery as case study).
So, generally from experience, 50% DoD is attained at between 12v and 12.2v for a 12v battery system.

7. Locate the red and black cables that connects the battery and extend them out of the Inverter. The end of the cable might be lugged or clipped as shown in the pictures below

8. Get a very good charger and you're good to go. For 12v get a 12v charger like this one in the picture

For 24v get a 24v charger like this one in the picture

Undergoing Conversion

After conversion, had been in operation for 3months

1.5kva pure sine wave converted APC UPS/INVERTER

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1kw APC UPS converted to INVERTER

Installation at Ibafon, ogun state using 1.5kva with 2pcs 100ah batteries

These UPS conversions work well as long as you take care of the temperature increase due to load and longer run time compared to what they were originally designed for.

iukpe:
These UPS conversions work well as long as you take care of the temperature increase due to load and longer run time compared to what they were originally designed for.

Yes, they work very well especially the APC. I installed one in a cafe of six systems with fans and other load since August 2015. The cafe opens between 9am and 9pm every day and there's not been a single issue. I have also installed for a couple of my clients, most of them got my contact through Nairaland. I personally use three of the APC myself and the results are quite heart warming.
So it works and works very well and it's also well protected against high temperature and overload.

APC installation in SuruLere, Lagos

how many watts can the ups take? if I may how many watts is the ups?

Allem:
how many watts can the ups take? if I may how many watts is the ups?

The UPS is 1500VA and can conveniently take 900W of load. It will conveniently pick a fridge with other house hold loads like TVs, blenders, bulbs, fans etc.

More conversion pictures

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Bros, i want to know if this kind of setup(modified ups) will affect the battery life since it has no battery indicator.

bobojoshua:
Bros, i want to know if this kind of setup(modified ups) will affect the battery life since it has no battery indicator.

It will not. It has a battery indicator and a load indicator. Indicators have nothing to do with battery life. Remember the batteries are charged by a smart external charger.

Wow this is really interesting..I have a blue type 12v battery just for my laptop.Can i use a ups as inverter?