How Many Batteries For a 3000W Inverter?

In this video I will tell you how

many

batteries

you need for a 3000 WT

inverter

. The answer may surprise you because most people are wrong. So I'll give you two examples of a lithium battery and a lead acid battery that I see often. people using a 3000W

inverter

with a 12 volt 100 amp hour battery, which surprises me, no wonder the battery dies after half a year. I'm going to talk about battery voltage and capacity, which are the most important factors when sizing the battery on an off-grid. solar power system must limit the current to 100 amps, this has several reasons and benefits, lower cable cost, cheaper charge controllers, higher efficiency, we can limit the current by increasing the voltage, which means that for each voltage of the battery we can have a maximum power range of the inverter.

They are for 12v battery inverters up to 1,000 Watts 24v battery inverters up to 2,000 WTS 48v battery inverters up to 5,000 WTS If you want more power use a 48v battery with inverters in parallel I will calculate it for a 3000 watt inverter we divide 3,000 WTS between 48 volts to become 63 amps, then we need to multiply it by a 125% safety factor to convert it to 78 amps, we need to use an 80 amp fuse, this is less than 100 amps, so okay, as already was analyzed, an additional benefit is that the charge controller current will decrease as can be seen in the following calculation 800 W of solar energy divided by a 12vt battery equals 66 amps we choose for a 70 amp charge controller but with a 48 volt system we can repeat the calculation and we will see that it only needs a 20 amp charge controller.

It will be much cheaper to buy it now. The second part of the calculation is a term called C-rate. Every battery has a recommended C-rate. This is the 2 C point for lead acid and 1 C for lithium. This is a recommended charge and discharge current of a battery, for example, a 100 amp hour lithium battery should be charged and discharged at a maximum of 100 amps because 100 amp hours * 1 C equals 100 amps. Let's repeat the calculation for Le acid 100 amp hours * 2 C = 20 amps, we can see that a lead-acid battery can deliver significantly less current; You can still draw 100 amps from a lead-acid battery, but the battery won't last long because heat will be generated and it will degrade faster than you will either. capable of extracting 100 amp hours because a lot of energy is lost in heat.

Now let's get back to the topic with an example of lithium

batteries

. We already know that we need a 48 V battery. Next, we need to calculate the current it will consume. 3000 W / 48 Vol is the same. 62.5 amps, this is below the recommended discharge rate of a 100 amp hour battery, which is 100 amps. We need to use a 48 volt 62.5 amp lithium battery. A 48 volt 100 amp hour server rack is an ideal example of a battery suitable for a 3 Kow inverter can also use multiple batteries connected together, such as 4 12 volt 100 amp hour batteries connected in series or two 12 volt 100 amp hour batteries connected in series. 24 volts of 100 amp hours in series.

There will be a link in the description to lithium batteries. I recommend now we will repeat the calculation for the lead. acid batteries we start by doing the same calculations 3000 watts divided by 48 volts equals 62.5 amps a 100 amp hour lead-acid battery with a rate of 2 C can deliver 20 amps, then we divide the battery current by 20 amps 62.5 amps / 20 amps equals 3 we need three 100 amp hour batteries for a total capacity of 300 amp hours because 300 amp hours * 2 C = 60 amps we need a 48 volt 300 amp hour Le acid battery to effectively power a 3000W inverter, this is three times the size of lithium and will weigh 1000b compared to lithium's 110b.

A possible battery configuration is four 12 volt 100 amp hour batteries in series and then in parallel with two other strings for a 4S 3p battery. Always charge batteries fully before connecting for lithium. You need a 48 volt. 100 amp hour battery and for lead acid you need a 48V 300 amp hour battery. Always adhere to the C rating of a battery for maximum life. Thank you for watching this video like this if you want to get more information like this. Are you confused about solar energy? Get seven free Solar Diagrams by commenting on the pin below.