Notes:

1. Apple Computers were based on findings from Apple themselves there are many models we chose the latest with the highest consumption please see your adapter for the wattage.
2. For Desktop PC‘s please see link to Cooler Master PSU Calculator to calculate typical usage based on specifications of your machine Please click here. A Typical office PC would use roughly 65-85 Watts. No The Power supply does not make up the watts being used i.e a PSU of 850W will not use 850W of power it will only use what it needs based on the hardware of the machine and the function its busy doing.
3. Computer Monitors now these vary quiet a bit as colour and resolution as well as display types play a roll we recommend researching or using a watt meter to determine what your monitor uses we can say though that they are typically low in consumption as apposed to a TV.
4. For printers, Inkjet / Ink Tank printers will idle 5-15 watts, Printing will be 20-50 Watts while Laser Printers idle will be 10-30 Watts and while printing will be 250-600 Watts depending on the size and speed of the printer, High end laser printers may take 1000 Watts while printing.
5. CPAP machines (Continuous Positive Airway Pressure), We put the highest wattage found from google (which showed between 30-60 watts) but it is best to confirm this amount before making a purchase we recommend using a watt meter to make close to 100% sure.
6. Oxygen Machines, Same as CPAP please confirm the wattage use of your machine with a watt meter, as on google showed 250-750 Watts (We selected 850W to be on the safe side should there be any surge spikes).
7. Purchase the machine you will be needing for your uses we strongly advise against a machine with close to the same output watts as what your devices will be drawing (pulling) for example 300W Portable power station but you want to use something that is 350w we don’t recommend this as it will trip and or damage the machine, what we do recommend is something with at least 30-50% higher than what your power draw will be for example your power draw is 350w we recommend 500-600w upwards as this will counter prevent any surges that may or may not occur. This part is aimed while on grid and the power goes out there is an approx 3-5ms delay on UPS devices while EPS may have up to 30ms delay which may trip your appliances depending on the sensitive of that appliance. Please do not use heating element machines on power back ups as these may damage the inverter/power station.
8. Strongly recommend reading the manuals of these machines once received them to see how to care for them as they can be sensitive and subject to degrading of the battery over a period of time.
   As well as surge protectors on the mains and your DB Board as a surge may void your warranty should it get damaged via a power surge.
9. Gel / Lead-acid Inverters have set rules that you should not use more than 50% of the battery otherwise this degrades/damages the battery with that being said those inverters their Wh ratings are displaying half as to display safe run-times. Lithium’s have a DOB of 80% but not recommended you can run them down to 100% and thus their Wh Ratings are showing in full. For the health of the battery it is best to keep lithium batteries including LifePO4 batteries not below 80% usage (Refer to your products manual).
10. UPS vs EPS, UPS would be invters and inverter trolley’s while EPS would be the portable power stations. The difference below
    “A UPS is designed to provide a continuous, uninterrupted power supply with minimal interuption as the power switches from grid to battery.”
    “An EPS is primarily for emergency situations. Its purpose is to provide backup power to essential equipment during a power outage, typically for safety or critical operations.”
    Most EPS products have UPS functionality however at a much higher delay from grid to battery in comparison. These are great for camping or connecting appliances during a black-out / Load-shedding / load reduction what ever Eskom wants to call spade these days. Sensitive electronics such as computers should rather use UPS system rather than EPS even though some EPS systems can handle computers that demand high wattage while switching from grid to battery for example Ecoflow Delta 2 running a Gaming PC using 600 watts is fine but anything above 600 may trip the PC while switching from grid to battery even though the Power supply on the PC is 1250W gold rated there is a 50% chance of it happening (Save your work and save your game)
11. We “Tech Guy SA” Takes no responsibility for any miss calculations based on this calculator.