# Replace Furrion 25A Charge Controller with SmartSolar 100/30...not charging! **URL:** \ **Category:** DIY\ **Tags:** rv, lithium\_battery, diy\ **Created:** [17 April 2026 00:58 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622 "2026-04-17T00:58:17Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [17 April 2026 00:58 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/1 "2026-04-17T00:58:17Z")
I have a 2022 Grand Design 261BH, that has solar panels on roof along with a Furrion 25A charge controller. I had changed my 2 lead acide batteries for (2) 100aH LifePO lithium batteries. Its been charging and working fine, but wanted to have a Charge Controller that worked better with lithium batteries as the Furrion controller only charges my lithiums to 80%. I swapped the charge controllers, pretty simple. Plugged the wires in on the SmartSolar and it powered up. I could read it on the bluetooth connection on my phone. It shows the battery charging when im connected to shore power, but it’s showing that my solar panels are not charging the battery. I checked all my fuses in the normal spot, all wires are connected as should be. Please help! ---
**Author:** ![water\_rat](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/water_rat/32/45_2.png) [@water\_rat](https://community.victronenergy.com/u/water_rat)\ **Post date:** [17 April 2026 10:33 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/2 "2026-04-17T10:33:41Z")
You are connected to the mppt via victron connect? Post some screen shots of the overview, battery settings and detailed history. ---
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [21 April 2026 02:59 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/3 "2026-04-21T02:59:54Z")
Yes 🙂 I am using the VIctron app on my iPhone. here is a short video showing my connection on the RV, as well as my settings on the app. In the video you can see just the BULK light is blinking. ![IMG_2219](https://europe1.discourse-cdn.com/victron/original/3X/5/a/5abb9c2506629ec9a5e234e68ea2b470c93f69d5.png) ![IMG_2218](https://europe1.discourse-cdn.com/victron/original/3X/9/5/95b4bd3aa0bb04e88963bfae37cba90c5b40e82e.png) ![IMG_2217](https://europe1.discourse-cdn.com/victron/original/3X/2/0/20be20308880257db61541b08247d4efc8d1d8d5.png) ![IMG_2216](https://europe1.discourse-cdn.com/victron/original/3X/2/1/212c18ffecfeeb81c794e02b6d0198e6e19f84d0.png) ---
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [21 April 2026 03:01 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/4 "2026-04-21T03:01:31Z")
and a few more pics of the APP ![Screenshot 2026-04-20 at 8.01.12 PM](https://europe1.discourse-cdn.com/victron/original/3X/9/3/93b1ea29f81e79a5609ff7a4b468a2bcab187418.jpeg) ![IMG_2222](https://europe1.discourse-cdn.com/victron/original/3X/6/e/6eaa63d219079ce6f2a157751c70e1034b4371d5.png) ![IMG_2219](https://europe1.discourse-cdn.com/victron/original/3X/5/a/5abb9c2506629ec9a5e234e68ea2b470c93f69d5.png) ---
**Author:** ![chrigu](https://avatars.discourse-cdn.com/v4/letter/c/ba9def/32.png) [@chrigu](https://community.victronenergy.com/u/chrigu)\ **Post date:** [21 April 2026 06:22 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/5 "2026-04-21T06:22:07Z")
> [@pchurchward](#): > > ![IMG_2217](https://europe1.discourse-cdn.com/victron/original/3X/2/0/20be20308880257db61541b08247d4efc8d1d8d5.png) > > ![IMG_2216](https://europe1.discourse-cdn.com/victron/original/3X/2/1/212c18ffecfeeb81c794e02b6d0198e6e19f84d0.png) You have no PV voltage coming in. Check the PV side for a blown fuse, bad connection or similar. ---
**Author:** ![M\_Lange](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/m_lange/32/16_2.png) [@M\_Lange](https://community.victronenergy.com/u/M_Lange)\ **Post date:** [21 April 2026 06:39 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/6 "2026-04-21T06:39:32Z")
> [@chrigu](#): > > You have no PV voltage coming in. Check the PV side for a blown fuse, bad connection or similar. Polarity ---
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [21 April 2026 16:01 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/7 "2026-04-21T16:01:02Z")
Thanks everyone, from the fuses I know of, none are blown. I’m going to reach out to the RV manufacturer if there’s a fuse hidden somewhere else specifically for the Solar. In the meantime, can you elaborate more on “polarity” and what you mean by that comment? ---
**Author:** ![lxonline](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/lxonline/32/25567_2.png) [@lxonline](https://community.victronenergy.com/u/lxonline)\ **Post date:** [21 April 2026 16:03 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/8 "2026-04-21T16:03:27Z")
Negative and positive are the wrong way around on the solar. Alternatively check that nothing is clamped on the cable insulation that is a common one as well. ---
**Author:** ![Karl-Heinz](https://avatars.discourse-cdn.com/v4/letter/k/ad7895/32.png) [@Karl-Heinz](https://community.victronenergy.com/u/Karl-Heinz)\ **Post date:** [22 April 2026 13:46 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/9 "2026-04-22T13:46:23Z")
Which Li Battery do you have? The SR is set for smart Lithium. ---
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [30 April 2026 19:53 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/10 "2026-04-30T19:53:17Z")
I swapped my old controller back and its charging like normal…maybe i have a defunct Victron unit. @Karl-Heinz the batteries are Lossigy 12v 280AH LiFePO4 Picture attached, also should this dial be set on something else? ![IMG_2278](https://europe1.discourse-cdn.com/victron/original/3X/d/d/ddd4cd4a52a776982bc77274d82ea06cd9a94134.jpeg) ---
**Author:** ![lxonline](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/lxonline/32/25567_2.png) [@lxonline](https://community.victronenergy.com/u/lxonline)\ **Post date:** [30 April 2026 20:05 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/11 "2026-04-30T20:05:15Z")
The dial means nothing if you have programed with Victron connect. You can leave it on 7 if you want to though. It is weird how its not picking up any voltage if the polarity is correct. ---
**Author:** ![Justin](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/justin/32/24_2.png) [@Justin](https://community.victronenergy.com/u/Justin)\ **Post date:** [30 April 2026 20:51 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/13 "2026-04-30T20:51:48Z")
Since Furrion uses a + - + - connection block instead of the + - - + block that Victron uses, I’m also leaning toward a reverse PV polarity condition. ---
**Author:** ![pchurchward](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@pchurchward](https://community.victronenergy.com/u/pchurchward)\ **Post date:** [30 April 2026 20:56 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/14 "2026-04-30T20:56:23Z")
thanks guys, i tried swapping the + and the - but still no change. ---
**Author:** ![Justin](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/justin/32/24_2.png) [@Justin](https://community.victronenergy.com/u/Justin)\ **Post date:** [30 April 2026 21:11 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/15 "2026-04-30T21:11:29Z")
Ah dang, well there goes that idea then. Well, though out-of-box failures are uncommon with Victron, they’re never impossible, so time to get in touch with the seller and file a warranty claim! ---
**Author:** ![lxonline](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/lxonline/32/25567_2.png) [@lxonline](https://community.victronenergy.com/u/lxonline)\ **Post date:** [1 May 2026 06:23 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/16 "2026-05-01T06:23:13Z")
And you are teating with a meter to make aure there is voltage at the terminals when it is connected? ---
**Author:** ![Justin](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/justin/32/24_2.png) [@Justin](https://community.victronenergy.com/u/Justin)\ **Post date:** [13 May 2026 23:01 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/17 "2026-05-13T23:01:55Z")
@pchurchward So, I had one of these (a 100/30, also in the HQ2601 serial range) as an RMA today, same symptoms of not recognizing PV input with a known-good known-polarity input, and discovered that Victron has added a PV relay control to these units. I have no idea when it was added, and it’s not documented anywhere yet, but seems relevant to the OP here as well. Get into the Device Info page (follow these instructions [5. Configuration and settings](https://www.victronenergy.com/media/pg/Manual_SmartSolar_MPPT_100-30__100-50/en/configuration-and-settings.html#UUID-330502da-9b37-93ce-dc17-09c2a4e131ce)) and _if_ the PV relay has tripped, there will be a button there to click to reset it. Once it’s been reset, the button disappears (thus I don’t have a screenshot of it to share). In the case of the unit I had here for an RMA, the unit immediately began responding normally and charging as expected once I’d reset the relay. ---
**Author:** ![CharlieJ](https://avatars.discourse-cdn.com/v4/letter/c/b5ac83/32.png) [@CharlieJ](https://community.victronenergy.com/u/CharlieJ)\ **Post date:** [14 May 2026 15:02 UTC](https://community.victronenergy.com/t/replace-furrion-25a-charge-controller-with-smartsolar-100-30-not-charging/56622/18 "2026-05-14T15:02:59Z")
FYI, the PV voltage must be at least 5VDC \> battery voltage for the MPPT to turn on.