Mecer UPS / Inverter Batteries [Deep cycle]
Buy Mecer UPS / Inverter Batteries [Deep cycle] - online in South Africa
UPS and Inverter battery (Deep cycle batteries)Your UPS system is one of the most crucial components in your critical power infrastructure, and for your UPS, the batteries are really the “heart” of that system. Even though your UPS needs that heart, batteries are often neglected. Regardless of the batteries you choose, all batteries decrease in their ability to store and ....more..
UPS and Inverter battery (Deep cycle batteries)
Deep-cycle batteries are effectively capable of discharging up to 80% of its capacity.
The best lifespan vs cost method is to keep the battery at an 50% depth of discharge.
Deep cycles are rated in Volt-Amps (VA). A volt amp is how many amps the battery can supply at a certain voltage before it is flat.
100Ah is quite popular and it will supply 12V at 1 Amp for 8.3 hours (12V x 1A x 8.3 hours = 100Ah)
By using an inverter, you can supply 220V to devices. The battery will supply a certain amount of current at 12Volts to the inverter, which then coverts this to 220V at the required final current.
A power factor (p.f.) in the 0.6 to 0.8 range is typical.
- Peukert constant is the efficiency of the battery. A Peukert constant close to one indicates a well performing efficient battery with minimum losses and higher than one means less efficient battery.
- Inverter efficiency is the ratio of the usable AC output power to the sum of the DC input power and any AC input power. Typical grid-tied inverter efficiencies exceed 95% under most operating conditions. Efficiency changes as a function of AC output power, DC voltage, and inverter temperature.
We are using a power factor of 0.8.
Remember that inverters and batteries have losses - we have excluded this from the calculation to simplify this as much as possible.
- We are using a power factor of 0.8 (typical pf averaged)
- The supplied power needed = (Watts / pf) = (150Watts/0.8) = 187.5VA
- To get the Amps supplied by a 12Volt battery, we need to divide the VA by 12V
- (VA divide by 12V) = 214.28VA / 12 V = 15.625Amps
- To get the hours, simply divide the battery's Ah by the Amps
- (Battery Ah / Amps) = 100Ah / 15.625Amps = 6.4hours
- 18 Watts florescent light = 53 hours
(22.5VA, 1.875A @ 12V, 53hours on 100Ah)
- 42" inch TV 79Watts = 12.15 hours
(98.75VA, 8.2A @ 12V, 12.15 hours on 100Ah)