{"id":97746,"date":"2026-02-18T05:40:02","date_gmt":"2026-02-17T20:10:02","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=97746"},"modified":"2026-02-18T14:31:12","modified_gmt":"2026-02-18T05:01:12","slug":"franklinwh-ac-coupled-loop-vpp","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/franklinwh-ac-coupled-loop-vpp\/","title":{"rendered":"FranklinWH – The AC Coupled Answer To VPPs"},"content":{"rendered":"

\"FranklinwhFranklinWH are busy making themselves a compelling reputation for Australian customers.<\/p>\n

So should you consider one for your place? Yes, if it\u2019s an AC coupled solution you need.<\/p>\n

This article is by no means a comprehensive product review but given how lively the comment section was after SolarQuotes founder Finn Peacock\u2019s recent post<\/a> on AC coupling, I thought it was worth mentioning a couple of key features for what is one of the few non-hybrid batteries<\/a> on the market.<\/p>\n

Franklin’s VPP Warranty<\/h2>\n

I had a call recently with FranklinWH’s refreshingly good technical support, and they mentioned the company has organised an integration with Origin\u2019s Virtual Power Plant programme<\/a> called Loop (full disclosure: Origin owns SolarQuotes<\/a>). Now the economics of using a VPP<\/a> at your place can be as variable as the weather and your mood for air conditioning, so we’ll leave that aside.<\/p>\n

What I thought was interesting is that Franklin have expressly stated they will warrant<\/a> the battery while you\u2019re operating as part of a VPP<\/a>. I think putting this down in writing is excellent.<\/p>\n

\"\"<\/p>\n

While batteries are supposed to store and discharge energy, some other brands effectively shorten or perhaps even void the warranty on the equipment if you decide to use it doing the work it\u2019s designed for – weird. They\u2019re afraid that a VPP will damage or prematurely degrade a domestic battery with a commercial workload.<\/p>\n

So flogging your battery too hard is ruled out, but I\u2019d liken a VPP to using a light passenger car for commercial deliveries. It\u2019s something that happens every day, just think of the Uber operators and taxi drivers out there and how they\u2019d respond to being told they have no warranty.<\/p>\n

Really a battery should be warranted no matter how you use it. If there\u2019s technical limitations then the battery management system is perhaps where the manufacturers should be looking to place limits, not the fine print.<\/p>\n

Franklin’s Quality Technical Support<\/h2>\n

The reason I was reaching out to Franklin in the first place wasn’t VPPs, but a question posed to me by a bloke who has two 5kW Fronius Primo inverters on a single phase property where they’ve recently installed a FranklinWH battery.<\/p>\n

Problem is, only one of the solar inverters is AC coupled so that it works to generate and recharge the battery during an outage, when the customer ideally wanted them both running to use all his solar.<\/p>\n

Bench Racing Some Ideas<\/h2>\n

When Finn and I recently visited a potential electrification project on a difficult inner city home, we were pointing out and talking through all the myriad ways available to tackle the different problems it presented.<\/p>\n

While I was gesticulating about how to route a new supply to the switchboard, where you\u2019d put the inverter and how the hot water could be integrated, Finn was peering at aerial imagery of the equally problematic small shady roof.<\/p>\n

As a card-carrying aficionado of the AC-coupled club, he arrived at a microinverter solution for the solar, and I had to admit he was right. This is one of the niches where DC coupled solar could work but something like Enphase makes perfect sense. Easier wiring to the roof, no box on the wall, efficiency individualised down to single panels.<\/p>\n

Of course this means an AC coupled battery solution was in order, even if it was a hybrid that just didn\u2019t have solar panels connected.<\/p>\n

Some years ago all the cool kids had a Powerwall 2 (or several of them) and a stack of solar using Enphase. The Tesla app provided a nicer user interface than Enphase’s Enlighten, while many soon forgot the panel level monitoring they were so keen on during the sales process.<\/p>\n

The only thing that brought it unstuck was if there was an outage and the battery went flat overnight. Generally you needed the grid to get things going again. And depending on your DNSP, sometimes the bigger problem was a connection limit, which at worst hamstrung you with 13.5kWh of storage and 6.6kW of solar, because the total inverter capacity hit the allowable 10kW ceiling.<\/p>\n

Control Is Needed<\/h2>\n

In many respects, the grid has an infinite capacity to soak up solar power, but once you\u2019re disconnected there must be much tighter control. You can\u2019t just keep pouring energy into a battery, and with AC coupling you don\u2019t want a solar inverter to overpower the battery inverter either.<\/p>\n

Some innovators would use a relay to signal mains failure and close a dry contact that might throttle solar output or simply cut an inverter off.<\/p>\n

With the 5kW Powerwall 2 there was an integrated control, where the battery could signal an outage and cause a Fronius (or other compatible inverter) to throttle it’s output to 5kW. In this instance, I suspect the installers didn\u2019t know and didn\u2019t care to learn this wasn\u2019t the case with FranklinWH.<\/p>\n

How Does Franklin Work?<\/h2>\n

Like many brands, FranklinWH uses a gateway to connect everything together and relies on frequency shifting<\/b> to actively control solar inverter output.<\/p>\n

This allows oversized solar inverter capacity up to a hefty 30 kW<\/b> to be connected to and controlled by the FranklinWH system during grid outages ensuring stable and safe system performance. So if you have a decent-sized single phase solar power system, Franklin might just be the simplest solution to add a battery.<\/p>\n

Just make sure that the installers aren’t making it their<\/em> simplest solution. Sometimes a DC coupled hybrid really is the best answer but installers may cite warranty concerns as an excuse to smash in a simple AC system, when really they’re just too busy (or a little too lazy) to replace an inverter and move DC wiring.<\/p>\n

Let us know if you have any other AC coupled questions and we\u2019ll look further into the subject. For now Franklin looks like a good option but if you have Enphase already, I wouldn\u2019t discount the batteries they offer, even if Enphase need to discount the price.<\/p>\n","protected":false},"excerpt":{"rendered":"

FranklinWH are busy making themselves a compelling reputation for Australian customers. So should you consider one for your place? Yes, if it\u2019s an AC coupled solution you need.<\/p>\n","protected":false},"author":28,"featured_media":97847,"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-97746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-battery-storage","entry"],"acf":[],"yoast_head":"\nFranklinWH The AC Coupled Answer To VPPs<\/title>\n<meta name=\"description\" content=\"FranklinWH offers battery warranty support even when you're trading energy. 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He\u2019s a licensed electrician, builder, roofer and solar installer who for 14 years did jobs all over SA - residential, commercial, on-grid and off-grid. A true enthusiast with a skillset the typical solar installer might not have, his blogs are typically deep dives that draw on his decades of experience in the industry to educate and entertain. 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I keep seeing installers and Facebook pundits claiming the only proper way to attach a battery to a\u2026","rel":"","context":"In "Battery Storage"","block_context":{"text":"Battery Storage","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/battery-storage\/"},"img":{"alt_text":"ac-coupling","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2026\/02\/unfashionable-ac-coupling.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":48930,"url":"https:\/\/www.solarquotes.com.au\/blog\/delta-hybrid-inverter-mb1936\/","url_meta":{"origin":97746,"position":1},"title":"New Delta Inverters Also Hybrid –\u00a0 At No Extra Cost","author":"Michael Bloch","date":"March 31, 2021","format":false,"excerpt":"When Delta Electronics told us about their new H8E and H10E single-phase solar inverters late last year, they didn't mention a \"secret\" feature. The company has revealed it to SolarQuotes, along with details of a new Delta battery and other bits. In December last year we mentioned some of the\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":"Delta Hybrid H8E and H10E inverters","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/delta-hybrid-inverter.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/delta-hybrid-inverter.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/delta-hybrid-inverter.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/delta-hybrid-inverter.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2021\/03\/delta-hybrid-inverter.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":94944,"url":"https:\/\/www.solarquotes.com.au\/blog\/the-truth-about-ac-dc-coupling\/","url_meta":{"origin":97746,"position":2},"title":"The Truth About AC & DC Coupling","author":"Finn Peacock","date":"October 4, 2025","format":false,"excerpt":"A few years ago I was invited to an \"energy roundtable\" hosted by the South Australian government. The idea was we'd all sit around and hatch some big ideas to push the energy transition forward. This was peak excitement in SA - Elon had recently cut the ribbon on the\u2026","rel":"","context":"In "Energy Efficiency"","block_context":{"text":"Energy Efficiency","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/energy-efficiency\/"},"img":{"alt_text":"People unhappy about a DC only option","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/ac-vs-dc-coupling.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/ac-vs-dc-coupling.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/ac-vs-dc-coupling.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/ac-vs-dc-coupling.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/10\/ac-vs-dc-coupling.png?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":4228,"url":"https:\/\/www.solarquotes.com.au\/blog\/micro-inverters-battery-backup-compatible\/","url_meta":{"origin":97746,"position":3},"title":"Are micro inverters & battery backup compatible?","author":"Finn Peacock","date":"November 5, 2014","format":false,"excerpt":"Can you use a micro inverter off grid? Or even for grid connect with batteries? With the growth in the use of micro inverters, I'm starting to get more and more emails asking: can micro inverters be used in off grid (or hybrid) solar power systems? The short answer 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":"3 microinverters and 2 batteries","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2014\/11\/microinverters-battery-backup.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2014\/11\/microinverters-battery-backup.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2014\/11\/microinverters-battery-backup.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":82363,"url":"https:\/\/www.solarquotes.com.au\/blog\/hybrid-vs-solar-inverters\/","url_meta":{"origin":97746,"position":4},"title":"Hybrid Inverter Or Solar Inverter: Which Is Best For Adding Batteries Later?","author":"Kim Wainwright","date":"March 25, 2024","format":false,"excerpt":"Lately at SolarQuotes, we're getting slammed with this question: \"I'm gonna get a battery at some point. Should I get a hybrid inverter or a regular grid-tie inverter?\" That's the million-dollar question. I know which one I would get, but I'm not you! First, let's get this out of the\u2026","rel":"","context":"In "Solar Inverters"","block_context":{"text":"Solar Inverters","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-inverters\/"},"img":{"alt_text":"should you buy a hybrid or regular solar inverter?","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/hybrid-or-solar-inverter.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/hybrid-or-solar-inverter.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/hybrid-or-solar-inverter.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/hybrid-or-solar-inverter.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/03\/hybrid-or-solar-inverter.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":10098,"url":"https:\/\/www.solarquotes.com.au\/blog\/powerwall-2-as4777\/","url_meta":{"origin":97746,"position":5},"title":"Will it be illegal to install a single phase Powerwall 2 from Thursday?","author":"Finn Peacock","date":"March 26, 2017","format":false,"excerpt":"Unless your local electricity network provides a local variation to a new Australian Standard that becomes mandatory\u00a0on Thursday, it may\u00a0be illegal to install a Powerwall 2 plus\u00a0solar on a single phase. [Note: Someone has contacted me to say that their interpretation of the standard is that a 5kW battery inverter\u2026","rel":"","context":"In "Battery Storage"","block_context":{"text":"Battery Storage","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/battery-storage\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/03\/2017-03-26_17-09-58.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/03\/2017-03-26_17-09-58.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/03\/2017-03-26_17-09-58.png?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/03\/2017-03-26_17-09-58.png?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/03\/2017-03-26_17-09-58.png?resize=1050%2C600 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/97746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=97746"}],"version-history":[{"count":9,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/97746\/revisions"}],"predecessor-version":[{"id":97851,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/97746\/revisions\/97851"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/97847"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=97746"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=97746"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=97746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}