expiredwwglen posted Dec 24, 2024 08:55 PM
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Item 1 of 2
expiredwwglen posted Dec 24, 2024 08:55 PM
Massimo 300W Folding Solar Panels $99
$99
$134
26% offAmazon
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Deal Details
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
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
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
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
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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75 Comments
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https://massimoelectric
Get a 10 gauge MC4 to bare wire cord and use that to make the connection.
It comes with cables which include:
XT-60
Anderson
Two pin circular connector (don't know the name)
Barrel connector with 10 adapters
And a cable with what looks like a 5.5x2.5 (2.1?) connector on both sides, but manual says it 24V.
Edit:
I left of that it has a MC4 connector.
Sort of a stupid question before I actually test it... I have a Bluetti EB3A, and the other thing that convinced me to buy was one of the amazon reviews was from a person who said they used the 300W panel with an EB3A and got ~200W charging (which is the max the EB3A is capable of).
I saw your post where you said you measured the Voc to be 31.33V. I've read in multiple places that the EB3A can accept a Voc range of 12-28V. FWIW the specs for the Massimo 300W panel says the Voc is ~24V.
So I know the Massimo has a controller, which is what I would connect the EB3A to. Does that controller limit the voltage to 24V, even if the panels themselves are higher voltage? I don't want to risk frying my EB3A by feeding it more than the 28V maximum voltage it states it can accept.
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Sort of a stupid question before I actually test it... I have a Bluetti EB3A, and the other thing that convinced me to buy was one of the amazon reviews was from a person who said they used the 300W panel with an EB3A and got ~200W charging (which is the max the EB3A is capable of).
I saw your post where you said you measured the Voc to be 31.33V. I've read in multiple places that the EB3A can accept a Voc range of 12-28V. FWIW the specs for the Massimo 300W panel says the Voc is ~24V.
So I know the Massimo has a controller, which is what I would connect the EB3A to. Does that controller limit the voltage to 24V, even if the panels themselves are higher voltage? I don't want to risk frying my EB3A by feeding it more than the 28V maximum voltage it states it can accept.
I haven't tried the "DC" output which claims 24V, just the XT-60 that hooks to other devices. The "DC" output is a 5.5mm x 2.1mm (or 2.5? not sure). You would need to measure the Voc on that and see what it comes out for you.
Matter of fact, you should check both the XT-60 output and the "DC" output and see what yours gives. Mine might have been high, but I don't think so. 31V is perfect for a Lead Acid 24V system, and the LiFePO4 24V systems need about 33V to work properly.
But then again I see the review where it says it works with the Bluetti.
this link has a graph which shows the EB3A drops off at around 30-31V,.
https://community.bluet
and once you start drawing power out, the voltage will drop.
All I can say is to play around and try if you feel comfortable. They should have a safety to cut off power if voltage is too high. Maybe partially shade the panel to drop the Voc and once power flows you can remove the shade and get full power.
Matter of fact, you should check both the XT-60 output and the "DC" output and see what yours gives. Mine might have been high, but I don't think so. 31V is perfect for a Lead Acid 24V system, and the LiFePO4 24V systems need about 33V to work properly.
But then again I see the review where it says it works with the Bluetti.
this link has a graph which shows the EB3A drops off at around 30-31V,.
https://community.bluet
and once you start drawing power out, the voltage will drop.
All I can say is to play around and try if you feel comfortable. They should have a safety to cut off power if voltage is too high. Maybe partially shade the panel to drop the Voc and once power flows you can remove the shade and get full power.
I guess I better plug mine in for a couple more hours to check to see if I have the same problems. I only ran mine for about 1 hour.
If it starts to overheat, I will take it apart and see what is going on.
Panel setup on the built-in stands without trying to optimize the angle. Cable was a MC4 to XT60i going into a Delta 2 Max. Current tested with a clamp meter, and temperature with a cheap Laser Temp Gun from Amazon. Power was based on EcoFlow App.
Low Temp was around 30 F and High around 50 F.
Started about 9:00 am and got around 170 watts.
Case around the electrical box was zipped closed.
Tested at 10:30 and got 219 Watts and 9.6 Amps. This calculated to a working voltage of about 22.8V.
Front Temp: 115 F
Box Temp By XT60: 90 F
Box by USB ports: 86 F
Left zipper open to cool off the electronic box.
Tested at 11:43 and got 219 Watts.
Front Temp: 113 F
Box Temp By XT60: 83 F
Box by USB ports: 74 F
3:15 pm
Sun was very off center, and front of panel barely lit up
70 Watts
Front Temp: 67 F
Box Temp By XT60: 61 F
Box by USB ports: 62 F
I will test my other panel tomorrow.
With the panel completely unfolded flat (i.e. not angled using the legs) at about 1pm CST (so sun past the meridian) I measured 32V on the XT60 output. Same voltage on the barrel connector. So I'm really not sure how Massimo gets away with claiming "~24" Voc (on their web site) for these.
I was able to find a discussion on an ecoflow Facebook group with a similar situation (although their portable battery had an even lower 25V max voltage on the MPPT input). https://www.facebook.co
There wasn't much in the way of conclusions there other than that these panels are quite a bit higher than 24V Voc.
The only other factor I'm not sure about (again, brand new to solar) is that apparently Voc increases as temperature decreases. It's in the mid 20s F outside right now. Apparently, manufacturers quote Voc in "ideal" conditions, which is probably 70-80 deg F. So maybe that could account for why the voltage I'm seeing is so much higher than stated?
I did take the gamble and try connecting my EB3A. It stayed at 0W (due to overvoltage) unless I left only two of the panels exposed and partially shaded them. That likely got the voltage down to around 28V. I was getting about 40W that way after I unshaded the two panels. I found I could then expose the 3rd panel and the charging rate would go up to about 70W, and then finally the 4th and 5th panels at which point I got about 135W. I then tried slightly angling the panels more towards the sun. I saw it go to 170W and then back 0 with the overvoltage message at which point I unplugged it. Nothing fried though, as I was able to fold it back up to only partially expose two panels. Then I plugged it back in and it started charging again at about 40W.
My EB3A was also already at 93% SOC, so it's possible the charging rate was being limited because the battery was almost at capacity. I need to run it down to 50% or so and then I can do some more testing.
But either way, I'm annoyed that Massimo lists these as ~24V Voc when they exceed that by over 30% (or that tilde is doing a LOT of work). Is this common in the solar panel industry? Kind of hard to believe that these were sold at Costco, although maybe this issue is why they're being dumped for $100 now.
These panels certainly aren't useless (although I'm concerned about the controller melting as it did for the previous poster), but I'm not sure it's worth keeping them. I don't really want to run out and buy a new (and undoubtedly more expensive) battery just to get an MPPT that can accept 33V. I read on reddit someone adding a buck converter to reduce the voltage, but that seems pretty hacky since the input voltage will vary with clouds and as the sun gets lower to the horizon.
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I just have no idea if it's typical for panels to measure out at much higher voltage than their specs state. If not, then that doesn't give much confidence about Massimo (or whoever actually manufactured these). However, other aspects make these appear to be a higher quality product (mono vs polycrystalline as someone else stated earlier in the thread, all the included cables, the fact that they were sold at Costco, etc.).
It's just strange that they would screw up the voltage specification though, as that's one of the most important aspects to know about a solar panel.
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