STORE LOCATION

STORE LOCATION

STATESVILLE NC United States

** 12 volts used to be a standard for extra low voltage power systems. Today, most systems are 24V or 48V You can use 2 -12 volt batteries in series for 24 volts 3 for 36 volts and 4 for 48 voltsA battery rated for 100 amp hours will provide 5 amps for 20 hours.If we have a 12 volt battery, we multiply 100 by 12 and determine that the battery will provide 1200 watt hours.A 24 volt 100 amp battery will provide 2400 watt hoursA 48 volt 100 amp hour battery will provide 4800 watt hours.** Keep in mind, no matter what voltage you choose you always have the option of running 12 volt from 24 or 48 volt using a 12 volt 30 amp step down transformer or multiple step down transformers to still run all your 12 volt power needs example 12 volt led lighting.

Should I choose a 12 volt, a 24 volt or a 48 volt stand-alone power system? your energy consumption should determine the voltage of your power system.

- 1,000 watts = 83 amps @ 12 volts
- 2,000 watts = 83 amps @ 24 volts
- 4,000 watts = 83 amps @ 48 volts
- 20,000 watts = 83 amps @ 230 volts
**BATTERY CABLE SIZING**- 1 AWG handles 200amps at length of 9.4feet, use 1 gauge cable.
- 2AWG has 150amps at 10 feet, use 2 gauge cable.
- 4AWG has 100amps at 9.4 feet, use 4 gauge cable.
- 6AWG has 50amps at 11.8 feet, use 6 gauge cable.
- 1/0 AWG handles 300amps at 8 feet.
- 2/0 AWG battery 60 volts DC. 200
**amps**at a**cable**length of 15 feet. - 3/0 AWG battery cable has 300amps at 15 feet.
- 4/0 AWG battery cable has 600amps at 9 feet.

Doubling the voltage effectively halves the DC loads and halves the voltage drop. Because the battery voltage is doubled, the percentage of the voltage drop in relation to the battery voltage is only a quarter of the percentage drop with the lower battery voltage. Hence, with a 24 Volt system the cable need only be one quarter of the diameter as it does with a 12 volt system.

- Power (Energy) (P) = Watts
- Current (Flow) (I) = Amps
- Voltage (Pressure) (V) = Volts
- Cell = Single component of a Battery
- Battery (Battery Bank) = Collection of Cells wired in series or parallel

**Example** **Imagine that you have an air conditioner rated for 1500 watts on a fixed 120V circuit. How many amps is it?Amps = 1500 ÷ 120 = 12.5So the air conditioner is rated for 12.5 amps, although you'll often see this rounded to the next highest number.Example :** **Imagine that you want to know how many watts it takes to charge a laptop. If you know that the laptop is rated for 0.5 amp and a fixed household current of 120 volts, you choose the following equation and plug in the missing pieces:Watts = Amps × VoltsWatts = 0.5 × 120 = 60So the laptop draws 60 watts of electricity as it charges.**

- 1-1500 watts = 12 volt system
- 1500-3000 watts = 24 volt system
- 3000-10000 watts = 48 volt system
- KEEP IN MIND IF YOU HAVE A ITEM THAT DRAWS 20 AMPS AC YOU NEED TO ADD DC TO AC INVERTER LOSS. OUR INVERTERS ARE VERY EFFIECIANT BUT AS A EXAMPLE ON A 98% EFFICIENT INVERTER YOU WILL HAVE LOSSES THERE ARE EXACT NUMBERS TO CACULATE BUT WITH OUT BEING A MATHEMATICIAN TO GET YOU IN THE BALL PARK AND GIVE YOU A QUICK IDEA OF LOSS USE 30% LOSS FROM DC TO AC THROUGH A QUALITY INVERTER. EXAMPLE IF YOUR ITEM NEEDS 20 AMPS TAKE 20X.30%= 26 AMPS FROM BATTERY. THIS IS NOT EXACT CACULATION BUT CAN HELP YOU GET AN IDEA OF REAL WORLD AMP DRAW FROM YOUR BATTERY TO WHATEVER YOUR POWERING. THESE NUMBERS CAN VARY UP OR DOWN THIS JUST A ROUGH WAY TO GET A IDEA OFF LOSS.
- Cable size for inverter, divide the inverter’s wattage by your battery voltage; this will give you the maximum current for your
__cables__. (5000 W)/(24 Vdc)=208.33 A

AMP HOURS VS WATT HOURS 12 volt batteries rated at 100 Amp Hours are connected in series the voltage would increase to 24 Volts, the Amp Hours would remain the same but the Watt Hours have increased to 2400 watts. Doubling the voltage effectively halves the DC loads and halves the voltage drop. Because the battery voltage is doubled, the percentage of the voltage drop in relation to the battery voltage is only a quarter of the percentage drop with the lower battery voltage. Hence, with a 24 Volt system the cable need only be one quarter of the diameter as it does with a 12 volt system.

To determine input PV max watts into controller. Take the watts of each panel times number of panels and divided by the volts of system, Then add 20% this gives you the max amps into the controller.

Charging Lithium with a alternator.It is important to understand using a alternator hooked directly to a lithium battery will over heat and damage your alternator. Lithium batteries can charge at 100 amps causing over load on the alternator. The way around this is a DC to DC charger. This regulates the amount of amps output from the alternator.

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