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expiredwwglen posted Dec 24, 2024 08:55 PM
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expiredwwglen posted Dec 24, 2024 08:55 PM

Massimo 300W Folding Solar Panels $99

$99

$134

26% off
Amazon
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I found this deal while searching for a different solar panel. Looks like a good deal.

Reviews aren't the greatest, mainly people complaining about getting 70% of the rated output on the 100 watt unit.

https://www.amazon.com/Massimo-10...B09XGYQYPM

New Amazon Link:

Massimo 100W - 300W Solar Panels of Camping Outdoor Sports (300W) https://www.amazon.com/dp/B09XGYQYPM


Also available from Walmart for the same price.

https://www.walmart.com/ip/Massim.../978329269

New Walmart Link

https://www.walmart.com/ip/978329269


Edit:

Was sold by Costco about 2 years ago. $300

Here's a YouTube review where they got 291 watts.

https://youtu.be/vYp06kyA99k

New unboxing video from Yesterday where they paid $99

https://youtu.be/sTLENlePql8
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I found this deal while searching for a different solar panel. Looks like a good deal.

Reviews aren't the greatest, mainly people complaining about getting 70% of the rated output on the 100 watt unit.

https://www.amazon.com/Massimo-10...B09XGYQYPM

New Amazon Link:

Massimo 100W - 300W Solar Panels of Camping Outdoor Sports (300W) https://www.amazon.com/dp/B09XGYQYPM


Also available from Walmart for the same price.

https://www.walmart.com/ip/Massim.../978329269

New Walmart Link

https://www.walmart.com/ip/978329269


Edit:

Was sold by Costco about 2 years ago. $300

Here's a YouTube review where they got 291 watts.

https://youtu.be/vYp06kyA99k

New unboxing video from Yesterday where they paid $99

https://youtu.be/sTLENlePql8

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Dec 26, 2024 10:24 PM
1,063 Posts
Joined May 2015
BenjaminL6834Dec 26, 2024 10:24 PM
1,063 Posts
Quote from nyc10036 :
Excellent price.
I'd jump on this.

Before Covid , I paid $100+ for a 120W portable solar panel.

Where are people going to get a portable 200W solar panel for $99 these days?
Well there was another deal just a few weeks ago. 2x200 watt for $134
But some of them only had 3 legs 😂

https://slickdeals.net/f/17911566-2pc-200w-ugreen-powerroam-portable-foldable-monocrystalline-solar-panels-400w-total-133-98-free-shipping-w-code-solar40-at-wellbots?attrsrc=Thread%3AExpired%3ATrue&src=SiteSearchV2Algo
1
Dec 28, 2024 06:02 PM
2,352 Posts
Joined Jun 2013

This comment has been rated as unhelpful by Slickdeals users.

Dec 28, 2024 10:15 PM
667 Posts
Joined Jul 2014
dearmas54Dec 28, 2024 10:15 PM
667 Posts
Quote from koge811 :
Won't work for van life isn't useful since people need it for shelter to replace grid power due to high rents.

I was trying to get 60-80 working inside windshield while I park so I can leave reg on my battery won't work not enough juice

Also
Watch house rents and prop values crash as they have 90% vacancy demanding 90% salary median local area to service studio apt. Once landlords realize their vacancy is eating them alive. They can keep it off propped up for only so long I am encouraging people to vote for higher prop taxes as values go up it will destroy landlords and insurance rates

Because if they lower rent prop values drop and so dies their collateral leverage so they rather it keep staying vacant producing nothing of value.

This as a result isn't useful get flexible panels or solid ones for ca roof.

I guess it's ok if you glue it on up there.
Need for tools for homeless as landlords destroy cities
What the ….
3
Dec 29, 2024 09:52 PM
1,064 Posts
Joined Dec 2019
golfreakDec 29, 2024 09:52 PM
1,064 Posts
Feel like it's a misprint on the vendors part.
$44 for 100w $99 for 300w and $158 for 200w ??
It should be $99 for 200w and $158 for 300w.
Just know that it's being shipped from the vendor themselves and not Amazon.
Original Poster
Dec 30, 2024 08:10 PM
397 Posts
Joined May 2013
wwglen
Original Poster
Dec 30, 2024 08:10 PM
397 Posts
YouTube has a newer video on one of the $99 panels and it is rated at 300 watts.

Mine arrived today and is still on the front porch. I plan to set it out in the morning and see how they do.
Original Poster
Dec 30, 2024 09:37 PM
397 Posts
Joined May 2013
wwglen
Original Poster
Dec 30, 2024 09:37 PM
397 Posts
I tested Voc as 31.33 volt.

About 0.5 V below the turn on voltage (5 volt above battery) required for my 24 volt system at 86% charge (26.71 V) using a Victron Smart Solar 100/15 charge controller.

With lower temperatures and a lower charge state, it should work on a 24V system, but is not optimal.
Last edited by wwglen December 30, 2024 at 01:58 PM.
2
Original Poster
Jan 02, 2025 12:12 AM
397 Posts
Joined May 2013
wwglen
Original Poster
Jan 02, 2025 12:12 AM
397 Posts

Our community has rated this post as helpful. If you agree, why not thank wwglen

Definitely more than 200 watts. At least 250 watt panels and probably close to the 300 watt rating.

Conditions: Fairly clear low winter sun in North Carolina at 9:00am.

Tested with Victron 24V system at 65% charge. They started charging, one panel gave 4 watts and the other gave 130 watts. Cutting them off and back on resulted in one starting at 100 watts and the other one not starting.

Moved to an EcoFLOW Delta 2 Max at about 60%. Instantly started charging at 170+ watts per panel. I placed two BougeRV 100 watt Arch flexible panels in series on the Victron 24V system and got 144 watts. So at the low sun level I got about 39 watts more than the 200 watts of Bouge RV

Continued test until around noon when I got 183 watts from the BougeRV panels and 238 on the Massimo panels. The 300 watt panels gave 55 watts more than the 200 watt panels.

I wish they had another 2-3 volts open circuit to reliably start the 24V Victron system, but 238 on a warm day with a low sun is in my expected range.
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Jan 05, 2025 07:53 PM
316 Posts
Joined Dec 2014
vsluongJan 05, 2025 07:53 PM
316 Posts
Just got mine in. Despite the listing, the panels are mono crystalline, not poly. They are producing 4-5 times more than my Renogy 100W (charge controller and cable length probably impacts the lower wattage panel more). This probably has close to the advertised watts. It is heavier than I expected, but makes sense for a 300W panel
Partial shading performance is also pretty good, so the panels are connected in parallel
Jan 06, 2025 10:44 PM
24 Posts
Joined Apr 2020
SharpLaborer946Jan 06, 2025 10:44 PM
24 Posts
Quote from wwglen :
Definitely more than 200 watts. At least 250 watt panels and probably close to the 300 watt rating. Conditions: Fairly clear low winter sun in North Carolina at 9:00am. Tested with Victron 24V system at 65% charge. They started charging, one panel gave 4 watts and the other gave 130 watts. Cutting them off and back on resulted in one starting at 100 watts and the other one not starting.Moved to an EcoFLOW Delta 2 Max at about 60%. Instantly started charging at 170+ watts per panel. I placed two BougeRV 100 watt Arch flexible panels in series on the Victron 24V system and got 144 watts. So at the low sun level I got about 39 watts more than the 200 watts of Bouge RVContinued test until around noon when I got 183 watts from the BougeRV panels and 238 on the Massimo panels. The 300 watt panels gave 55 watts more than the 200 watt panels. I wish they had another 2-3 volts open circuit to reliably start the 24V Victron system, but 238 on a warm day with a low sun is in my expected range.
Have you (or anyone) tried wiring two of these in series? FYI, a youtube video review has a warning about wiring them in parallel "Warning parallel connecting these panels into one charger will fry the panels". Thanks in advance.
Jan 06, 2025 10:53 PM
24 Posts
Joined Apr 2020
SharpLaborer946Jan 06, 2025 10:53 PM
24 Posts
Quote from wwglen :
Definitely more than 200 watts. At least 250 watt panels and probably close to the 300 watt rating. Conditions: Fairly clear low winter sun in North Carolina at 9:00am. Tested with Victron 24V system at 65% charge. They started charging, one panel gave 4 watts and the other gave 130 watts. Cutting them off and back on resulted in one starting at 100 watts and the other one not starting.Moved to an EcoFLOW Delta 2 Max at about 60%. Instantly started charging at 170+ watts per panel. I placed two BougeRV 100 watt Arch flexible panels in series on the Victron 24V system and got 144 watts. So at the low sun level I got about 39 watts more than the 200 watts of Bouge RVContinued test until around noon when I got 183 watts from the BougeRV panels and 238 on the Massimo panels. The 300 watt panels gave 55 watts more than the 200 watt panels. I wish they had another 2-3 volts open circuit to reliably start the 24V Victron system, but 238 on a warm day with a low sun is in my expected range.
Have you (or anyone else) tried wiring two of these in series? FYI, there is a warning from a YouTube review saying 'Warning parallel connecting these panels into one charger will fry the panels'.
Original Poster
Jan 07, 2025 03:07 AM
397 Posts
Joined May 2013
wwglen
Original Poster
Jan 07, 2025 03:07 AM
397 Posts
Quote from SharpLaborer946 :
Have you (or anyone else) tried wiring two of these in series? FYI, there is a warning from a YouTube review saying 'Warning parallel connecting these panels into one charger will fry the panels'.
I don't see why it would be a problem, except in series it will exceed the voltage on my EcoFlow Delta 2 (60V).


I could test it on my Victron 100/15 MPPT, but I am limited to a little over 400 watts so it would be a waste.


I think the reviewer was concerned about over current/voltage in his controller, and just stated it wrong.
Jan 08, 2025 11:13 PM
305 Posts
Joined Nov 2019
pigeon_deuceJan 08, 2025 11:13 PM
305 Posts
Just got mine in today. For reference I'm very comfortable with Solar/rv life so fairly knowledgeable and have a variety of stuff. Panel was Heavier and bigger than expected but makes sense being 300 watts. I have 2 100w folders and this is heavier and larger footprint than those. Seems well made. Nice amount of hook up options on the back, probably the most I've seen. As far as performance, it was relatively overcast and partially shaded and I topped out at 106 watts. As a point of reference I have 3 100 watts rigid Ecoflow panels and I rested this panel on them so same location/angle and it performed better. Most I saw on the EFs was 86 and 92 once. I like this so much I plan to buy more for this price. It's a perfect companion for all the 220w input max sogens such as the Ecoflow 500wh unit. Perfect set up for camping. One of these laid on top of a vehicle would be perfect and on a sunny day you'd get the full 220 for sure!
Jan 09, 2025 01:07 AM
63 Posts
Joined Aug 2010
OendarilJan 09, 2025 01:07 AM
63 Posts
Got mine in too, and I was getting almost 200 watts an hour before sunset so these are definitely looking as advertised. I am so satisfied I went ahead and grabbed another one, this is a spectacular deal on these panels overall even if they are a bit bigger and heavier than the new 25% conversion panels. At a quarter the price I'm not complaining, though.
Jan 10, 2025 01:36 AM
11 Posts
Joined Jan 2025
SlickBoundary6860Jan 10, 2025 01:36 AM
11 Posts
on their website, their 300W panel has almost the same unfolded dimensions as their 200W panel (both cover 2x the area of their 100W panels).
https://massimoelectric.com/solar-panels/

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Jan 10, 2025 06:10 AM
11 Posts
Joined Jan 2025
SlickBoundary6860Jan 10, 2025 06:10 AM
11 Posts
does anyone know what connectors it comes with?

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