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OutBack FLEXmax FM100-300VDC 100A 300Vdc MPPT Charge Controller

(42 ratings)

SpecificationCompareSee all
Controller typeMPPT Charge Controllers
Maximum charging current100 A
Maximum voltage of the solar panels300 V
Attachments
OutBack FLEXmax FM100-300VDC 100A 300Vdc MPPT Charge Controller

Customer reviews & Questions

Verified buyer reviews

Reviews (42)
Questions (4)

Everret

07/10/2025

OutBack Power 5.0KW Skybox Grid-Hybrid Inverter Open Box

Bought this one in case I want to add some batteries to my installation later. So far, so good

Sam

08/17/2024

OutBack Mobile Inverters FX2524MT

that's a 5-star service and a 5-star product!

Sam Space

08/01/2024

OUTBACK Charge Controller MPPT 60A Battery FM60-150VDC

You're killing it guys, thanks

Henry

07/23/2024

OutBack Power 5.0KW Skybox Grid-Hybrid Inverter Open Box

Very easy customer service experience. Thank you.

Manney

07/16/2024

OutBack Mobile Inverters FX2524MT

So far i'm quite satisfied. would i recommend a1? 4sure

Iris

02/10/2022

OutBack Battery-Based Inverter 3.0kW FXR3048A-01

Grabbed that along with panels at their fulfillment center at Orlando. Very nice people, know their job. told me all about driving all this solar stuff home safely.

BorderLine

02/10/2022

OutBack Battery-Based Inverter 2.0 kW FXR2012A

Quite a convenient model, easy to program. The efficiency could be better, but for this money it’s a very good deal.

Garry

08/17/2021

OutBack Battery-Based Pre-wired Inverter 8.0 kW FLEXpower...

ok, i basically purchased this instead of getting an inverter and controller for my panels. quite convenient indeed and very easy to setup – i just basically hung it on the wall in the garage, connected it to my PV system and main panel and ran its standard program and voila. approved.

Cain

08/12/2021

OutBack Battery-Based Inverter 3.5 kW VFXR3524A-01

I was very pleased with the speed of delivery, thx! Yesterday we’ve finally finished the installation, everything is in place. The inverter works, it is very silent, let’s hope it stays that way.

P. Willis

08/11/2021

OUTBACK Charge Controller MPPT 60A Battery FM60-150VDC

Awesome charge controller! Yes, not the cheapest, but if you want to get an MPPT charge controller, I suggest you give this brand and A1 a try. I like that it can store 128 days of data, allowing you to see trends over time.

Patrick

08/06/2021

OutBack FLEXmax FM100-300VDC 100A 300Vdc MPPT Charge Controller

Works great with my li-ion batteries. Don’t expect any miracles from this unit, but it is a durable workhorse that can be installed outside without worries. I also liked the service and a pickup option, it saved me a lot of time.

bowser

08/05/2021

OutBack Battery-Based Pre-wired Inverter 8.0 kW FLEXpower...

very convenient. thank you very much

Tawnya A.

07/28/2021

OUTBACK Charge Controller MPPT 60A Battery FM60-150VDC

Excellent quality! Very well made. Had a bit of a problem with setting it up though.The manual is 126 pages long! Could not get customer service after waiting for 13 minutes. Would buy it again, but this time hire another electrician other than myself to help with the installation.

Dilis Calvin

07/21/2021

OutBack FLEXmax FM100-300VDC 100A 300Vdc MPPT Charge Controller

I did my research before the purchase and you should do the same. Under my circumstances it was the best option, but keep in mind that it requires MATE3, MATE and MATE2 are not supported.

Jose Luke

07/19/2021

OUTBACK Charge Controller MPPT 60A Battery FM60-150VDC

I took an FM60 to Haiti recently. Very hot and high humidity. We coupled it with eight 180watt 26v modules. The controller was very easy to set up, and the charging began immediately. We had a 24v battery bank (8 x 6v). We put some heavy loads on it like pressure pumps, a big miter saw and a fridge. The unit never missed a beat.

Lamar Kodey

07/19/2021

OutBack FM80-150VDC 80A FLEXmax MPPT Charge Controller

Just awesome. The same goes for the service and delivery. The display shows all the relevant system data. Highly recommend

Remy J00

07/14/2021

OutBack Battery-Based Inverter 3.6 kW VFXR3648A-01

Just want you to know that the package arrived, everything is good. We’ll start the installation this week. Your calculator really helped with sizing, great tool.

Ruins4

07/08/2021

OutBack Battery-Based Inverter 3.5 kW VFXR3524A-01

Thanks for the service! The package came in like 4 days or something, very happy. I followed your guidelines and installed the inverter in the garage. Hope that this one will last longer than my last one. Stay safe!

Mia

07/06/2021

OutBack FM80-150VDC 80A FLEXmax MPPT Charge Controller

I owned a cheap 30A controller before. It clearly wasn’t up to the challenge of marine life. Installing this one was very easy, and now I enjoy fully charged batteries even on cloudy days.

RockyLee

07/04/2021

OutBack Battery-Based Inverter 2.5 kW FXR2524A-01

The inverter is obviously too small for a home installation, but it fits my RV system just fine. The installation was a bit messy, cause my van is so old. your articles on the setup actually helped quite a bit

Ricardo Rolls

07/04/2021

OutBack Battery-Based Inverter 2.8 kW VFXR2812A

Overall, it’s a good model for a camper van or a boat for its money. The efficiency isn’t the best, but it works well when it’s hot, the warranty is all right and it’s somewhat programmable. I picked two of these and they've been serving me for 6 months now.

DanTheMan

07/03/2021

OutBack Inverter 50A GS4048A-01

Bought this model four month ago. Before the purchase I discussed with my electric supplier the possibility of grid connection and net metering. The procedure was very simple and my installer also helped a lot with little details. Now I sell into the grid basically half of what I generate. Very happy with myself and my purchase, so thank you

Orfo1

07/03/2021

OutBack Inverter 50A GS8048A-01

just got my package. everything’s good. Thanks for the help, the delivery was very fast indeed! Nick and I will finish the installation tomorrow, i think. take care

Kory

07/02/2021

OutBack Battery-Based Inverter 2.0 kW FXR2012A

The inverter itself I found to be too small for a home system. I put it in my van, works fine. the efficiency could be higher though. As for service, everything was good, the package arrived fast, tnx.

RetteR

06/27/2021

OutBack Battery-Based Inverter 3.0kW FXR3048A-01

Just received the package, everything seems to be in place. Thanks for the fast delivery!

Railz

06/24/2021

OutBack Battery-Based Inverter 2.0 kW FXR2012A

I installed this one on my yacht a long time ago, but it started clipping, because I added some stuff on the board. Anyway, I decided to buy another one to stack them. The retailer from which I purchased the first inverter went out of business, but luckily i found the same inverter here. The prices are good and the shipping was fast. Thanks a bunch..

Clyde B.

06/24/2021

OutBack Inverter 50A GS8048A-01

I picked this one for our Texas ranch where we live solely on solar energy. grabbed it at the warehouse in Arlington. It is a well-made product, quite heavy, but high-quality nevertheless. I backed it up with batteries and they made living off-grid a much more comfortable experience.

KirHar

06/21/2021

OutBack Inverter 50A GS4048A-01

A very good inverter from a reliable company. My friend has the same model so I decided to pick it. The delivery was fast, nothing was broken so you have my thanks and utmost respect. :)

Jerald

06/12/2021

OutBack Battery-Based Inverter 3.5 kW VFXR3524A-01

Purchased this one for my boat a year ago. Came back to find optimizers and decided to drop you a line and say thanks. Generally sea air doesn’t sit well with inverters, but so far this model is doing well.

Mr. Jasper

06/11/2021

OutBack FM80-150VDC 80A FLEXmax MPPT Charge Controller

We are not connected to the grid and all our energy comes from the sun. That’s why we need a backup for everything just in case. OutBack makes reliable equipment, hence our choice.

HuntF

06/11/2021

OutBack Battery-Based Inverter 3.6 kW VFXR3648A-01

Thanks! It’s been a year since me and my family went off-grid: the power lines here aren’t really good and we often sat in the dark for hours. Since we’ve installed solar, these problems have gone away. We also grabbed some batteries from you to have a supply for the night, they are nice.

Colin Jr

06/04/2021

OutBack Inverter 50A GS8048A-01

We used this inverter for our gas station in Ohio. The system is quite big so we had to get two of them. The results do not disappoint: we basically nullified our daily needs in commercial electricity. and at night the energy is cheaper anyway. Thanks a lot for the fast delivery!

Raynard Lewin

05/23/2021

OutBack FLEXmax FM100-300VDC 100A 300Vdc MPPT Charge Controller

Great charge controller, but I wonder why they couldn’t add a small display that you can see in so many other models. If this is an important feature for you, you will have to look through other options, but overall it is an excellent device

Clara

05/18/2021

OutBack Battery-Based Inverter 2.5 kW FXR2524A-01

We bought two of these a year ago for our home system. My husband actually used your calculator to size the installation. The inverters still work fine even though it can be quite dusty here in Arizona. just wanted to thank you once again for your amazing service!

Ernan

05/16/2021

OutBack Battery-Based Inverter 3.0kW FXR3048A-01

I purchased this inverter and so far I’m impressed with how well it withstands the weather here in Arizona. Each of my two previous inverters died within six month after the purchase because of the dust and heat, but this one is already 1 year old and is still going strong.

Simon Day

05/16/2021

OutBack Battery-Based Inverter 2.0 kW FXR2012A

Thx, I picked this model for my RV four month ago and it doesn’t disappoint so far. I drive around a lot, but since I installed solar, I don't really need camper parks anymore. There isn’t a lot in my van — a laptop, lights plus some stuff for cooking. this is why I chose an inverter with a little capacity — it’s enough for me.

Rem

05/12/2021

OutBack Inverter 50A GS4048A-01

A strong reliable inverter. In our cause it handles even a little more than expected, since our system is 4.2 kW in size or around that. I watch my system like a hawk and check everything: gotta hand it to him, it has very good efficiency. Overall, a solid product, would definitely recommend it.

Henry

11/02/2020

OutBack Power 5.0KW Skybox Grid-Hybrid Inverter Clearance

Very easy customer service experience. Thank you.

Everret

09/18/2020

OutBack Power 5.0KW Skybox Grid-Hybrid Inverter Clearance

Bought this one in case I want to add some batteries to my installation later. So far, so good

Patrick

08/06/2021

Dilis Calvin

07/21/2021

I did my research before the purchase and you should do the same. Under my circumstances it was the best option, but keep in mind that it requires MATE3, MATE and MATE2 are not supported.

Raynard Lewin

05/23/2021

Robert & Joe

08/15/2021

Can this work with 4 100 ah battleborn battery's And 3000 victron inverter for starters I plan on adding on , eventually Allso does it have remote viewing via smartphone Capabilities?

A1 SolarStore

The default settings of the FLEXmax 100 charge controller are for lead-chemistry batteries intended for deep discharge. These include all energy storage for marine, golf-cart, and forklift applications. They also include gel-cell batteries and absorbed glass-mat (AGM) batteries. OutBack Power recommends the use of batteries designed specifically for renewable energy applications. Lithium-based batteries and other advanced battery technologies may require special charging considerations.

08/04/2021

can it work with a remote temperature sensor? thx

A1 SolarStore

Yes, a remote temperature sensor is among listed options.

Bobbi S.

07/25/2021

Would it work well as part of a solar array in a mountain hut? What concerns me is height

A1 SolarStore

The device is rated for 10,000 ft

Janet Leopold

07/16/2021

Is there a minimum bank size or can I connect it to a single battery?

A1 SolarStore

Minimum battery bank size for this controller is 100 Ah.

Specification

Battery Charging Voltages	24/36/48VDC
Controller type	MPPT Charge Controllers
Maximum charging current	100 A
Maximum voltage of the solar panels	300 V
Dimensions LxWxH	23 x 8.8 x 6 in
Manufacturer	OutBack Power Systems
Manufacturer Part #	FM100-300VDC-AFCI
Operating Temperatures	–13° to 140°F
Warranty	5 years manufacture
Delivery Time	5-7 business days

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About product

Outback, 100 AFCI-300VDC MPPT Charge Controller, 100A, 300VDC, 12/24/48/60VDC, 100 AFCI

OUTBACK FLEXmax 100 AFCI is an innovative charge controller from OutBack Power Systems. To guarantee reliability, this model had to pass extensive testing, including Highly Accelerated Life Testing (HALT). The proprietary FLEXmax algorithm stays active at all times, boosting your energy production by up to 30% compared to controllers without MPPT. The model comes with integrated arc/ground fault protection and rapid shutdown functionality for advanced safety.

FlEXmax family of charge controllers is manufactured by a company with 15 years of experience in production of fault intolerant equipment. It has a special enclosure to keep the dust and moisture out, making it a good option for outside use. The device records and stores performance data for up to 128 days. Remote programming and monitoring are in the list of features too, providing superior system integration.

Performance, efficiency and versatility – these three words define FLEXmax MPPT Charge Controllers. They charge your batteries faster, maximizing electricity exports to the grid and your return on investment.