Off-Grid Solar Systems Uncategorized

Powerwall or Lead Acid?

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Different types of batteries are available in the market that is suitable for off-grid situations. Here we analyse two of those batteries: Powerwall and Lead acid batteries based on various parameters like efficiency, lifespan, output, dependability and maintenance.


Powerwall 2 is now out

Read the latest Australian review on the powerwall 2 here.


Powerwall batteries are designed in a way that will help in monitoring discharge, rate of charge, temperature and voltage levels. Powerwall batteries are loaded with a 10-year warranty. There is no guarantee over the lifetime of lead acid batteries. Most of the manufacturers offer one year warranty; some go up to offering two years, which comes only for the highly-priced product. What customers look for in products is reliability, and hence Powerwall seems to be the natural choice of those who want a support.


Powerwall batteries’ efficiency is 92% and this is much better than that of lead acid batteries. About 85% of efficiency is seemed to be provided by the lead acid batteries.

Powerwall battery

Power Output

Continuously 2 kilowatts of power can be expected from a Powerwall battery. Maximum what you can expect from this battery is an extension up till 3 kw. It requires 2 kilowatts energy to refrigerator, lights, TV, laptops – more things will not be possible – after sunset. Air conditioning can be run on low power mode, but usage of other electronic appliances may be too risky. Other electric appliances, that require high power, may not be possible to run while on off-grid situation. Powerwall batteries help you achieve all these.

It would be sufficient with two Powerwall batteries to run the home appliances after sunset. Care is still advised in running too many items finally leading to a collapse. Air conditioning the house, before sunset, is always advised. This would help in reducing the amount of electricity required.

Normal lead acid batteries cannot be fully trusted while on off-grid mode with many appliances running simultaneously. If the lead acid battery comes with a 10-year lifespan, then using various appliances at the same time can be considered. If you are looking for batteries that run for a long time, exercising caution while using them is advised.

A lot of information has been written about the powerwall here. Good for Americans to read especially.

Space Requirement

As the name suggests, Powerwall batteries can be mounted on walls. Not only that, these batteries can also be installed inside the house or outside. These do not take up much space. If these are installed in the proper manner, these are safe inside the house. Lead acid batteries may get heated up anytime. It is safe to install them outside the house. The space required for lead acid batteries is much more than that required for Powerwall batteries. Lead acid batteries can take up a considerable amount of space if these have to support two houses off-grid.



Powerwall batteries do not require maintenance whereas lead acid batteries require a check every six months, if they have long lifespan.

Considering all of the above, it is very clear that Powerwall batteries are much better than lead acid batteries for off-grid situations. Though the power required to run the house completely depends on the solar energy stored during daylight, for immediate and reliable power need, Powerwall batteries are excellent. Most importantly, usage of solar energy for sometime reduces the electricity consumption.

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