Backup Systems for Long Power Failures

Sinetech’s products will help you to provide power through those difficult load shedding hours and other unplanned power failures. No noise, no petrol/diesel, no fumes. Seamless, instant, 100% automatic backup power.

The products shown here are particularly well suited for homes, townhouse developments, farms and guesthouses. These systems should also be considered for small businesses such as restaurants, shops, medical practices, pharmacies, workshops, etc. where data capture/transfer is not necessarily critical. (For critical backup such as for servers and important computers, you should consider a UPS system.)

Individual shops in shopping centres would find these systems ideal as they can basically be installed anywhere unlike generators. Sinetech offers cost-effective, reliable and carefree back-up systems.

On average these systems need about one sq. meter of space only.

The advantage of these products is that you don’t have to install a noisy generator. Generators need constant refilling and maintenance and are not ideal for residential areas or for small businesses where noise and pollution from the exhaust are a problem.

The systems offered here consist of either a modified sinewave or a sinewave inverter; with a built-in battery charger, automatic changeover switch and a large battery bank. Frequently asked questions are answered on this page.

How do these systems work?

The unit is permanently connected to utility power so that while mains is present the extra large built-in battery charger recharges the batteries and keeps the batteries fully charged until a power failure occurs. The equipment you want to back up is also permanently connected via the system. In case of a power failure the backup system automatically switches over, via an extra fast transfer switch to the inverter, which will continue to provide power to the equipment within 15 msec. This is extremely fast and standard equipment like TVs, DSTV decoders, microwaves, fans, etc. are unaffected. The sinewave systems can also backup computers but it is possible that a very small percentage of computers could reset during the switchover time.

When utility power returns, the whole procedure is reversed and the unit will switch back to utility power and will automatically start re-charging the batteries. Your equipment remains connected to the system even when power is restored. The whole process is fully automatic.

System Example: Plug ‘n Play Backup Power
System Example: Professional Backup Power System
How long will the inverter system run when there is a power failure?

The amount of backup time is determined by the size of the connected battery bank and the load drawn from the system. The backup time is directly in proportion to the load drawn. The backup time is normally calculated at full load (i.e. if the system is a 2200VA system, full load is 2200VA). If you remove some of the connected load, then the backup time will be extended accordingly.

How long does it take to charge the batteries when utility power returns?

The recharge time of the batteries depends on how much power was removed from the batteries during a power failure. The recharge times in the catalogues is indicated at full battery discharge.

If there is a planned power outage, can the system last for the full power outage time?

Yes, but the system has to be correctly sized to begin with. These systems are capable of bridging power outages from 2 – 24 hours or (e.g. for 2 hours per day twice a day) as the battery chargers are powerful enough to recharge the battery bank to cater for the second outage on the same day (providing there is enough time between the 2 outages – at least 4-6 hours). Again this process if fully automatic.


The smaller systems can be used as stand-alone systems or can be wired into your DB board. The larger systems can also be used as stand-alone systems but it is by far more convenient if they are hard-wired into your DB board. Sinetech will provide support, such as block diagrams, for the electrical installation.


These systems require minimum maintenance. Depending on the system chosen, the batteries are either semi sealed lead calcium batteries or fully sealed Gel batteries. Batteries are maintenance free and do not have to be filled. It is recommended that battery sets are installed in a battery cabinet and are locked in a room with ventilation, where small children do not have access. As with all batteries, these batteries can be dangerous if tampered with. Sinetech does supply complete systems with batteries and battery cabinets if required.

What is the difference between a home long backup system and a UPS system?

A UPS system is designed to backup sensitive equipment like servers, computers, medical equipment, telecommunications equipment, etc. Standard UPS systems have small internal battery sets and can only provide short backup times of approximately 5 – 10 minutes which cannot be extended as the internal battery chargers are small and can only cater for the internal battery sets they were designed for. Additional or external batteries cannot be connected to these UPS systems.

There are also long backup UPS systems available which can be supplied with external battery sets to provide backup for, usually not more than 2 hours. If the user requires longer backup than 2 hours, the system would then have to be intentionally oversized to cater for the longer backup time, which can then be extended to 4 – 6 hours. For longer backup times, UPS systems should be installed in conjunction with a generator.

The double conversion online UPS systems have no break whatsoever and the sensitive equipment will always run on electronically produced power and is not directly connected to the mains power.

Click here to go to our UPS system page on this website.

In contrast, inverter based long backup systems do have a small break when they switch over to backup power (irrespective of the inverter system brand or model). The higher quality systems, which Sinetech supplies, switch over in a very short time and it is hardly noticeable. Inverter backup systems incorporate larger battery chargers which allows larger battery sets to be installed which results in much longer backup times than UPS systems.

In contrast, home long backup systems, which do have a small break when they switch over to backup power (irrespective if the inverter system, but the good quality systems have a power break during switchover which is hardly noticeable), incorporate large battery chargers which enables extra large battery sets to be installed, which results in extra long back-up times.This is not possible with UPS systems.

What you need to do:

Firstly we recommend you read the explanation. Then make a list of exactly what appliances you want to provide backup power for. You need the appliance ratings in Watts, Amps or VA (this is usually stated on the back of the appliance on a label or in the manual). When you have this power rating, add them all together to come to a total power rating. This can be done with the help of an electrician or someone who understands these calculations.

You can then look at the different backup times provided by a particular unit. Please contact us for pricing and availability. We can arrange a trained electrician for installations in the greater Johannesburg and Pretoria areas.

You can connect the following appliances to the inverter systems as long as the total power consumption does not exceed the maximum VA rating of the unit:

  • Small to large Plasma or LCD TV
  • DSTV and MNet decoders
  • Surround sound systems
  • 5 to 10 energy saver lights
  • a Fan
  • Fridge and deep freezer
  • Home alarm system
  • Automatic garage door motor
  • Intercom
  • Electric fence
  • Microwave oven
  • Small kettle
  • Fax machine
  • some standard home Power tools

Avoid connecting the following items which have high inrush currents or use a lot of power:

  • Geysers
  • Underfloor heating
  • Stoves
  • Air conditioners
  • Washing machines
  • Tumble driers
  • Dishwashers
  • Pool motors

The larger inverter systems (5kW, 6kW, 8kW and 10kW systems) are able to run most of the more ‘power hungry’ items. Some of the more sophisticated systems are also available in three phase up to 72kVA.

KIT: TBB Energier Pro/Essential Inverter-Charger + Battery Bank

Fully-automated, fully integrated inverter-backup power systems for your home or office. Included in the system:

  • TBB Energier heavy-duty inverter featuring built-in AC charger with seamless switchover
  • Choice of Gel, Lead Acid or Lithium Batteries
  • Battery Cabinet
  • All cables, lugs and fuses.
  • Installation is NOT included in price.

How to calculate system size:
Work out the total WATTS rating of all the items you wish to power during a power failure, then consult the table below for the system you need. We’ve suggested average power ratings for appliances. Your load profile may differ.

± 120W

Router, DStv
± 20W

± 200W

± 5W each

± 800W

± 150W

Alarm System
± 20W

± 45W

Battery Type:Battery Qty:kWh Total:kWh at Rec. DoD*:Runtime @ 4 Hours:Compatible With:
Gel1 x 120Ah1.20kWh0.51kWh120W1kW | 1.6kW
Gel1 x 180Ah1.80kWh0.77kWh190W1kW | 1.6kW | 2kW
Gel1 x 240Ah2.40kWh1.02kWh250W1kW | 1.6kW | 2kW
Gel2 x 120Ah2.40kWh1.02kWh250W1.6kW | 2kW | 3kW
Gel2 x 180Ah3.60kWh1.53kWh380W1.6kW | 2kW | 3kW
Gel3 x 120Ah3.60kWh1.53kWh380W1.6kW | 2kW
Gel2 x 240Ah4.80kWh2.04kWh510W2kW | 3kW
Gel3 x 120Ah3.60kWh1.53kWh380W2kW
Gel3 x 180Ah5.40kWh2.30kWh570W2kW
Gel4 x 120Ah4.80kWh2.04kWh510W2kW | 3kW | 4kW |5kW | 6kW | 8kW
Gel4 x 180Ah7.20kWh3.06kWh760W3kW | 4kW | 5kW | 6kW | 8kW
Gel4 x 240Ah9.60kWh4.08kWh1020W3kW | 4kW | 5kW | 6kW | 8kW
Gel6 x 120Ah7.20kWh3.06kWh760W3kW
Gel8 x 120Ah9.60kWh4.08kWh1020W3kW | 4kW | 5kW | 6kW | 8kW
Gel8 x 180Ah14.40kWh6.12kWh1530W5kW | 6kW | 8kW
Gel12 x 120Ah14.40kWh6.12kWh1530W5kW | 6kW | 8kW
Gel8 x 240Ah19.20kWh8.16kWh2040W6kW | 8kW
Gel16 x 120Ah19.20kWh8.16kWh2040W6kW | 8kW
Gel12 x 180Ah21.60kWh9.18kWh2290W8kW
Gel20 x 120Ah24.00kWh10.20kWh2550W8kW
KIT: OmniPower Hybrid Inverter + OmniPower AGM+Gel Lead-Acid Batteries

POWER FAILURE? NOT YOUR PROBLEM. The Solar Station HYBRID Kit is the ultimate system for ensuring 100% automatic backup power during power failures. Kit includes:

  • Heavy-duty pure-sinewave 3-in-1 hybrid inverter with built-in battery charger
  • Battery cabinet
  • AGM+Gel Valve-Regulated Lead Acid batteries
  • All the cables and fuses required for setup.
  • Installation is NOT included in price

PV solar can be added at a later stage to create a Hybrid PV Solar System.

How to calculate system size:
Work out the total WATTS rating of all the items you wish to power during a power failure, then consult the table below for the system you need. We’ve suggested average power ratings for appliances. Your load profile may differ.

Model:Inverter:Phase:System Voltage:Battery Quantity:Battery Capacity: *
SSHY10000-Backup10kW OmniPower Hybrid InverterThree Phase48V16 x 12V 180Ah Sealed AGM 14.4kWh

* Useable Battery Capacity at recommended DoD

OmniPower PowerHex: Portable Compact Long Backup Power System

The OmniPower PowerHex is a mobile backup-power device delivering an elegant quality-of-life solution during loadshedding and other instances where the grid fails. Inside is a pure-sinewave power inverter capable of delivering 1000W continuously plus a choice of industry-leading OPR AGM+Gel battery (PowerHex) or a 12V 100Ah OPLi lithium-iron battery (PowerHex+). All of the components are housed in an ergonomic, portable, industrial-strength steel hexagon. The PowerHex also features wheels and a trolley handle for ease of handling.

The PowerHex is ready to use immediately. Plug it in at a wall socket using the cable provided and then plug your devices into the PowerHex’s AC socket: you’ll find 1 x 3-Pin (16A) Plug, 1 x 2-Pin Plug and 2 x USBs (2.1A). When the power fails, you will enjoy instant, seamless switchover from mains power to battery power. ECO-friendly and non-polluting. No Fumes. No Fuel. No Fuss.

The PowerHex powers a load of ±600W for an hour and the PowerHex+ will power a load of ±1000W for an hour. Suitable for TVs, DSTV Decoders, M-Net Decoders, Lights, Alarm Systems, Laptop computers, DeskJet Printers, Radios, Hi-Fi Systems, Security Systems, Cash Registers, PABX systems, modems, hubs, routers, etc.

OmniPower Power Caddy PS: Unique Personal Backup Power System

Reliable personal back-up power during loadshedding and other instances where the mains fail.

The Power Caddy PS is ready to use immediately. Remove the unit straight from its packaging, connect it to your LAPTOP, TV, DECODER, ROUTER, LAMPS and much more so that when the power fails, there is an INSTANT switchover from mains power to battery power.This compact unit with built-in inverter-charger sits unobtrusively in your living space, primed for action.

PowerCaddyPS-1xBatt (12V 1000VA Pure Sinewave Inverter + 1 x 105Ah 12V lead acid battery) Will power a load of 120W* for 4 Hours

PowerCaddyPS-2xBatt (24V 2000VA Pure Sinewave Inverter + 2 x 105Ah 12V lead acid batteries) Will power a load of 250W* for 4 Hours

* Back-up time varies according to load. Applies to fully charged and new 12V 100Ah batteries

With the Power Caddy PS, you will never be in the dark!

SPS: Personal Mini Power Station

Ever wish you had your own mini power-station? The SPS is it! Get backup power wherever you need it. Charge your SPS via grid power or solar panel. Solar panel must be purchased separately. Ideal for Computers, Laptops, Routers, TVs, Lights, Printers and more. ECO-friendly and non-polluting.