Picked up a pallet (20 panels) of these used panels Signature Solar just got in.
I tested two of the panels at random
got 175w and 180w,
which was A-ok by me.
test context:
- used a “WS400A” auto mppt solar panel tester
(https://www.aliexpress.com/snapshot...d=8134822824065474&productId=1005002413187038)
- tested in Plano TX, 8/27/21, approx 2:30 pm (solar noon/peak sun approx 1:30pm)
- around 20 degree tilt angle, facing ~10-30 degrees off perfect south
- full sun
- 90 F, panels were out in sun for 1-2 hours before test so all heated up already
other details:
- $640 Or $32 per panel.
- $800 out the door for me ($40 per panel). Im in Dallas area, 1.5 hours drive to signature solar, so I a rented a truck ($100 with gas) and sales tax was $60.
- came filthy dirty (to be expected)
- previously purchased a dozen santan solar used “series T” 250w used panels. Ive got 210w (85%) max from them, but to be fair: this is with them at same test conditions above, except lying flat (0 degree tilt angle) — so call it even between these two sets of panels. I believe in both should be able to get up to 90% of rates output in ideal conditions (your mileage may vary)
- I bought these because I wanted to expand the santan solar 250w array, and these are a close voltage Match: 250w= (37.6 VOC, 30.3 VMP) vs 208w (36.3 VOC, 28.71 VMP). Strings of 3 250w + strings of 3 208w paralleled into my 150v charge controller should work seamlessly.
- they’re also cpcery close in size and weight to the santan 250w panels which again was ideal for me
- come with MC3 connectors, I cut off and replaced with staubli mc4
- claimed 7 years old and maybe that’s true, but I’d just be conservative & assume they’re older than that when making purchase decision — when did MC3 get phased out? But back to value - $35 a panel before 26% tax credit… and they’re performing
- not affiliated with santan or signature solar in any way, just happen to be a dude building an off grid system in Dallas area, wanted more panels than the dozen 250w santan used panels i initially got, and with signature solar a 1.5 hour drive (save freight shipping) realized how cheap I could make it happen. thought I’d post my test results since these panels just got on signature solars website in the past couple weeks.
Used Solar Panels
CURRENT PANEL POLICY After doing research on damages and shipping practices we discontinued palletizing shipments of less than 10 solar panels. We have found that the stability and overall success of delivery increases substantially on pallets with 10+ panels. You may select In Store Pick-Up if...
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I tested two of the panels at random
got 175w and 180w,
which was A-ok by me.
test context:
- used a “WS400A” auto mppt solar panel tester
(https://www.aliexpress.com/snapshot...d=8134822824065474&productId=1005002413187038)
- tested in Plano TX, 8/27/21, approx 2:30 pm (solar noon/peak sun approx 1:30pm)
- around 20 degree tilt angle, facing ~10-30 degrees off perfect south
- full sun
- 90 F, panels were out in sun for 1-2 hours before test so all heated up already
other details:
- $640 Or $32 per panel.
- $800 out the door for me ($40 per panel). Im in Dallas area, 1.5 hours drive to signature solar, so I a rented a truck ($100 with gas) and sales tax was $60.
- came filthy dirty (to be expected)
- previously purchased a dozen santan solar used “series T” 250w used panels. Ive got 210w (85%) max from them, but to be fair: this is with them at same test conditions above, except lying flat (0 degree tilt angle) — so call it even between these two sets of panels. I believe in both should be able to get up to 90% of rates output in ideal conditions (your mileage may vary)
- I bought these because I wanted to expand the santan solar 250w array, and these are a close voltage Match: 250w= (37.6 VOC, 30.3 VMP) vs 208w (36.3 VOC, 28.71 VMP). Strings of 3 250w + strings of 3 208w paralleled into my 150v charge controller should work seamlessly.
- they’re also cpcery close in size and weight to the santan 250w panels which again was ideal for me
- come with MC3 connectors, I cut off and replaced with staubli mc4
- claimed 7 years old and maybe that’s true, but I’d just be conservative & assume they’re older than that when making purchase decision — when did MC3 get phased out? But back to value - $35 a panel before 26% tax credit… and they’re performing
- not affiliated with santan or signature solar in any way, just happen to be a dude building an off grid system in Dallas area, wanted more panels than the dozen 250w santan used panels i initially got, and with signature solar a 1.5 hour drive (save freight shipping) realized how cheap I could make it happen. thought I’d post my test results since these panels just got on signature solars website in the past couple weeks.