How can I build a 36V or 48V system when I don’t have enough budget?

If you want to build a higher voltage battery system like 36V or 48V but don’t have the budget to directly purchase a higher voltage storage battery, you can achieve it by connecting multiple 12V batteries in series. In this blog post, I will explain the principles of series and parallel connection, provide some examples of how to assemble 36V or 48V systems using 12V batteries, and discuss the advantages of using the GoKWh 12V batteries for this DIY project.

Principles of series and parallel connection

To increase voltage, batteries must be connected in series. Connecting batteries in series means connecting the positive terminal of one battery to the negative terminal of the next. This adds together the voltage of each individual battery.

For example, to make a 36V system, you need to connect 3 x 12V batteries in series. The total voltage will be 12V + 12V + 12V = 36V.

To increase capacity (amp-hours), batteries can be connected in parallel. This means connecting all the positive terminals together and connecting all the negative terminals together. The capacity adds together while the voltage stays the same.

How to use 12V battery to implement 36V or 48V battery system

36V system: Connect 3 x 12V batteries in series. Measure that the total voltage is around 36V.

48V system: Connect 4 x 12V batteries in series. The total voltage should measure around 48V.

Make sure to use the same brand/model of batteries and that they are charged to the same level before connection. Also connect all batteries together with the correct polarity.

Benefits of using 12V batteries

The 12V batteries currently on the market have added many new functions in order to make them more convenient for users to use. For example, Bluetooth and LCD screens allow users to detect the status of the battery at any time, and the lightweight and compact design saves a lot of storage space, etc.

Such as GoKWh 12V 100Ah LiFePO4 Battery:

  • Built-in BMS for safe charging and discharging in series connections (models with Bluetooth or LCD)
  • Long lifecycle of 4,000+ charge cycles resulting in 10+ year lifespan
  • Lightweight and compact lithium battery pack that is easy to assemble
  • IP65 waterproof rating allows for outdoor/mobile applications
  • Real-time battery monitoring via app or LCD provides peace of mind

All in all, by connecting multiple 12V batteries in series, you can cost-effectively build higher voltage battery systems for your projects without exceeding your budget.

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