{"id":94782,"date":"2025-09-27T07:05:00","date_gmt":"2025-09-26T21:35:00","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=94782"},"modified":"2025-09-27T10:46:21","modified_gmt":"2025-09-27T01:16:21","slug":"the-big-battery-trap","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/the-big-battery-trap\/","title":{"rendered":"The Big Battery Trap"},"content":{"rendered":"

\"\"<\/p>\n

Last week, I mentioned a bloke who was beaming after placing his order for a new 30 kWh home battery.<\/a> The plan was simple: charge it with solar during the day, then use it to both run his house and charge his EV at night. He reckoned he was set for energy independence.<\/p>\n

Here’s the problem: unless his installer has done some careful system design – and unless this budget battery actually has the control interface required – he’ll still be pulling power from the grid every time he plugs in his car.<\/p>\n

What the Fine Print Reveals<\/h2>\n

The retailer’s marketing looked impressive, but the small print told a different story. Backup power during a blackout? That’ll cost extra.<\/p>\n

That’s already a red flag. Most people assume a home battery always provides backup. It doesn’t. Always check the quote and get it in writing.<\/p>\n

Then I dug into the datasheet. It was billed as a:<\/p>\n

“30 kWh battery with 5 kWh hybrid inverter.”<\/p>\n

There’s no such thing. They meant 5 kW, not kWh. If the people selling you the system can’t tell the difference between power and energy<\/a>, that’s a worry.<\/p>\n

Why 5 kW Isn’t Enough<\/h2>\n

A 5 kW inverter1<\/a><\/sup> running a 30 kWh battery is like trying to drain your hot tub through a drinking straw.<\/p>\n

To fully charge from solar in winter, it would need about six hours of perfect sun. To discharge, the limit is still 5 kW.<\/p>\n

Now think about the EV. A standard single-phase home charger pulls 7 kW. That means as soon as the car plugs in, the battery can only cover 5 kW of that demand. The missing 2 kW? Straight from the grid.<\/p>\n

Add in the rest of the household loads – cooking, lighting, heating, hot water – and the grid is doing even more work. The battery will run out of power way before it runs out of energy.<\/p>\n

Can It Be Fixed?<\/h2>\n

In theory, yes. A good installer can set up a smart EV charger to monitor grid draw and throttle the charging speed so you always stay under the 5 kW battery limit. But that requires:<\/p>\n

1. A battery<\/a>, inverter<\/a> and EV charger<\/a> that support those smarts.
\n2. An installer who’s sat down with you and worked out your load profile.<\/p>\n

I’ll be blunt: at under $10k for 30 kWh installed, I doubt either of those things have happened.<\/p>\n

The Bigger Picture<\/h2>\n
\"Ad

The federal battery rebate has triggered a flood of deals on oversized battery systems. <\/a><\/p><\/div>\n

Cheap, giant batteries are flooding the market. And they’re being sold like flat-pack furniture: one size fits all, just whack it in the garage and “energy independence” is yours.<\/p>\n

But batteries aren’t flat-packs. They’re high-energy machines that only pay off optimally when the design matches the household. Without that, the dream of “no bills” becomes a reality of “mystery imports.”<\/p>\n

So by all means, grab a 30 or 50 kWh battery while the rebate makes them tempting.<\/p>\n

Just don\u2019t expect a cheap, cookie-cutter install to make your bills disappear. Without proper design, all you\u2019ve really bought is an oversized box that still needs the grid every night.<\/p>\n

Phase Shift is a weekly opinion column by SolarQuotes founder Finn Peacock. Subscribe to\u00a0SolarQuotes\u2019 free newsletter<\/a>\u00a0to get it emailed to your inbox each week along with our other home electrification coverage.\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Last week, I mentioned a bloke who was beaming after placing his order for a new 30 kWh home battery. The plan was simple: charge it with solar during the day, then use it to both run his house and charge his EV at night. He reckoned he was set for energy independence.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","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":[],"class_list":["post-94782","post","type-post","status-publish","format-standard","hentry","category-battery-storage","entry"],"acf":[],"yoast_head":"\nThe Big Battery Trap<\/title>\n<meta name=\"description\" content=\"Cheap, giant batteries are flooding the market. 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Batteries do not pay for themselves before the warranty is\u2026","rel":"","context":"In "General Solar & Storage News"","block_context":{"text":"General Solar & Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Solar battery backup","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/10\/solar-battery-backup.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/10\/solar-battery-backup.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/10\/solar-battery-backup.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/10\/solar-battery-backup.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2019\/10\/solar-battery-backup.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":98309,"url":"https:\/\/www.solarquotes.com.au\/blog\/beware-bargain-battery-offers-in-your-letterbox\/","url_meta":{"origin":94782,"position":1},"title":"Beware ‘Bargain’ Battery Offers In Your Letterbox","author":"Ronald Brakels","date":"April 15, 2026","format":false,"excerpt":"Sometimes I write blog posts that are fact checks. But today's is more a statement of fact.\u00a0 And that fact is: If your electricity consumption is anywhere close to normal, it's a bad idea to blow your only chance to use the battery rebate on a tiny 5 kilowatt-hour (kWh)\u2026","rel":"","context":"In "Battery Storage"","block_context":{"text":"Battery Storage","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/battery-storage\/"},"img":{"alt_text":"Snail mail home battery offers","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/battery-offer-mail.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/battery-offer-mail.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/battery-offer-mail.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/battery-offer-mail.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/02\/battery-offer-mail.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":67884,"url":"https:\/\/www.solarquotes.com.au\/blog\/home-battery-blackouts-mb2722\/","url_meta":{"origin":94782,"position":2},"title":"Beating Blackouts: 4 Levels Of Home Battery Backup","author":"Michael Bloch","date":"November 21, 2022","format":false,"excerpt":"If you have solar panels and are keen on getting a home battery for blackout protection, make sure you get the right one - and it's correctly installed. Blackouts in the suburbs of Australia's major cities are reasonably rare and short-lived - mostly. A recent exception to the rule was\/is\u2026","rel":"","context":"In "Battery Storage"","block_context":{"text":"Battery Storage","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/battery-storage\/"},"img":{"alt_text":"Home battery blackout capabilities","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/11\/battery-blackout-capability.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/11\/battery-blackout-capability.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/11\/battery-blackout-capability.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/11\/battery-blackout-capability.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2022\/11\/battery-blackout-capability.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":55433,"url":"https:\/\/www.solarquotes.com.au\/blog\/blackout-solar-battery-mb2216\/","url_meta":{"origin":94782,"position":3},"title":"Blackouts, Solar Power And Batteries","author":"Michael Bloch","date":"November 1, 2021","format":false,"excerpt":"Whenever there are significant blackout events, there's an uptick in solar power and battery interest. Hailstorms, heavy rain, lightning and wild winds have recently pummeled various parts of the country again; leaving left hundreds of thousands of households and businesses without mains grid electricity - and some for extended periods.\u2026","rel":"","context":"In "General Solar & Storage News"","block_context":{"text":"General Solar & Storage News","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-battery-news\/"},"img":{"alt_text":"Solar power and battery systems during blackouts","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/11\/solar-power-blackout.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/11\/solar-power-blackout.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/11\/solar-power-blackout.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/11\/solar-power-blackout.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/11\/solar-power-blackout.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":56453,"url":"https:\/\/www.solarquotes.com.au\/blog\/sonnen-evo-battery-review\/","url_meta":{"origin":94782,"position":4},"title":"sonnenBatterie Evo. 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