{"id":4722,"date":"2015-05-15T12:16:26","date_gmt":"2015-05-15T02:46:26","guid":{"rendered":"http:\/\/www.solarquotes.com.au\/blog\/?p=4722"},"modified":"2025-12-19T14:00:06","modified_gmt":"2025-12-19T04:30:06","slug":"powerwall-vs-lead-acid-batteries-which-is-best-for-off-grid","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/powerwall-vs-lead-acid-batteries-which-is-best-for-off-grid\/","title":{"rendered":"Powerwall Vs. Lead Acid Batteries. Which is best for off grid?"},"content":{"rendered":"
\"powerwall<\/a>

Does the Powerwall make sense for off grid applications?<\/p><\/div>\n

I recently wrote about how my parents could save money by going off-grid<\/a>\u00a0in sub-tropical Queensland under close to best case conditions, and how it made no sense at all for them to do this as the return from having grid connected rooftop solar is so much better.<\/p>\n

The recently announced Tesla Powerwall doesn’t change this. However, it will still be a very useful option for people who have no choice other than to live off grid, and for those who want to go off grid for non-economic reasons. It has a number of advantages over currently used lead-acid batteries, and in my opinion, for many applications the Powerwall knocks lead-acid batteries into a cocked hat, which will soon be squashed very flat, as lead-acid batteries are really heavy.<\/p>\n

Powerwall Warranty Versus Lead-Acid<\/h3>\n

 <\/p>\n

The Tesla Powerwall’s internal software carefully monitors its batteries’ rate of charge, discharge, voltage levels, temperature, percentage of world conquered, and so forth, in order to maximise their lifespan which enables it to come with a 10 year warranty with an optional extension out to 20 years. Meanwhile, the makers of lead-acid batteries have no control over how you are going to use their products and so only offer warranties of one year or perhaps two if you are willing to pay for a more expensive brand. This is the Powerwall’s greatest advantage over the competition. Most people, and particularly business people, are simply unwilling to shell out a significant amount of money for a new investment unless they know they won’t be out of pocket if something goes wrong. If lead-acid batteries were my only choice, I know I would pay a huge premium for ones that came with a ten year warranty.<\/p>\n

Powerwall Storage Capacity Versus Lead-Acid<\/h3>\n

 <\/p>\n

The capacities of the Powerwall and lead-acid batteries can’t be directly compared because life is confusing. For the $3,800 dollar cost of a 7 kilowatt-hour Powerwall I could buy around 17 kilowatt-hours of decent quality long life lead-acid batteries. However, because they can’t be discharged by more than 80% they really only have about 13.6 kilowatt-hours of effective storage. And if I want them to last 15 years then I’ll need to avoid discharging them by more than around 25% a night, so for the majority of the time they really only have about 4.25 kilowatt-hours of storage. So for day to day use the Powerwall is superior, but when required lead-acid batteries can be more deeply discharged to provide electricity during periods of bad weather and\/or high electricity use. But if this is done too often it will destroy them.<\/p>\n

Powerwall Efficiency<\/h3>\n

 <\/p>\n

A Powerwall’s energy storage efficiency is 92% which is significantly better than lead-acid batteries at around 85%. In practice this is not a huge difference, but it does help. It will take about one half to two-thirds of a kilowatt-hour less solar electricity to fully charge a Powerwall with 7 kilowatt-hours than lead-acid batteries, which is roughly half the average daily output of one solar panel.<\/p>\n

Space Invaders<\/h3>\n

 <\/p>\n

The Powerwall is suitable for inside or outside installation, takes up very little space, and as the name suggests is made to be mounted on walls. When properly installed it should be extremely safe. There are lead-acid batteries that can be installed indoors with suitable precautions, but due to the very small but real chance that a lead-acid battery will decide to transform itself into a hot pile of fuming goo, I strongly recommend putting them outside. The amount of space taken up by enough lead-acid batteries to power an off-grid house is not as great as many people often assume, but is still greater than what Powerwalls require. To take a two person household off-grid might require a bank of lead-acid batteries around the width of a single bed, the thickness of a dinner plate, and about as high as a bar fridge. While a battery enclosure is not strictly necessary for all installations, precautions do need to be taken to prevent children stress testing the system or vice-versa.<\/p>\n

Maintenance<\/h3>\n

 <\/p>\n

Sealed long life lead-acid batteries require a small amount of maintenance every six months. The Powerwall requires none.<\/p>\n

Powerwall Power Output Versus Lead-Acid<\/h3>\n

 <\/p>\n

A single Powerwall can provide 2 kilowatts of continuous power or 3.3 kilowatts peak. I have no idea how long peak power can be maintained, but hopefully it would be long enough to let me boil the kettle and grill a cheese sandwich while I play Dance Dance Revolution. An off-grid household with a single Powerwall would be limited in what appliances could be run after sunset. Two kilowatts is enough to operate lights, refrigeration, laptops, TVs, and not much else. Air conditioning<\/a> is not really possible unless it is a very small unit or it can operate in a low energy mode, and even then care will have to be taken with the use of other appliances. Electric space heaters are similarly restricted, but a highly efficient heat pump<\/a> could still be used. It would be difficult to use an electric stove, and as for clothes dryers and dish washing machines – forget about it.<\/p>\n

Two Powerwalls should be enough to provide normal evening appliance use for many households, although care would still need to be taken to avoid running more than one or two power hungry items at a time. And it would still be a very good idea to use the air conditioner to cool the house down before the sun sets to reduce the amount of electricity it draws in the evening.<\/p>\n

If a lead acid battery bank is large enough to have a lifespan of a decade or more, it should be large enough to handle normal appliance use in an evening. However, care should still be taken to limit electricity use after sundown to extend its lifespan.<\/p>\n

Powerwalls Plus Extra Solar Panels Beat Lead-Acid Batteries<\/h3>\n

 <\/p>\n

I recently calculated that to take my parents off-grid would require about $6,300 worth of lead-acid batteries with a total capacity of 28.8 kilowatt-hours and hopefully they would have a lifespan of 15 years or more. But if I had the option, I would now prefer to purchase them a single Powerwall and spend the left over money on extra solar panels. And because I would not have to set money aside to cover the possibility of their lead-acid batteries failing early, that would allow me to buy additional panels. So while the Powerwall would only have 7 kilowatt-hours of storage compared to the 23 kilowatt-hours the lead-acid batteries would have with an 80% discharge, the extra solar panels, aided by the better energy storage efficiency of the Powerwall, would let them generate solar electricity equal to their average daily electricity use even on completely overcast days. This option would require my parents to be a little more careful with their appliance use in the evening, and they could still need to conserve electricity and\/or use their generator more during periods of bad weather and high electricity use, but I see it as the superior choice because of the Powerwall’s 10 year warranty. For me, the extra peace of mind and financial security is definitely worth it, especially since I know that if something did go wrong, I’d be the one who gets blamed.<\/p>\n

Of course, what works for my parents may not work for everyone. Most households have less constant sunshine and greater electricity use. But I’m confident a majority of people will agree with me that for many off-grid applications the Powerwall’s long term warranty makes it superior to lead-acid batteries, even though it is not currently a clear winner on initial costs and gives a smaller maximum usable amount of storage per dollar.<\/p>\n","protected":false},"excerpt":{"rendered":"

I recently wrote about how my parents could save money by going off-grid\u00a0in sub-tropical Queensland under close to best case conditions, and how it made no sense at all for them to do this as the return from having grid connected rooftop solar is so much better. The recently announced Tesla Powerwall doesn’t change this. […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[551],"tags":[112,77,552],"class_list":["post-4722","post","type-post","status-publish","format-standard","hentry","category-battery-storage","tag-buyers-guide","tag-off-grid-solar","tag-tesla","entry"],"acf":[],"yoast_head":"\nPowerwall Vs. Lead Acid Batteries. Which is best for off grid? - SolarQuotes Blog<\/title>\n<meta name=\"description\" content=\"The Powerwall has a number of advantages over lead-acid batteries. 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