Holdontight
New Member
Is anyone aware of a DC to DC converter that can take a max input of 65V and output no more than 60V? I'm using a Bluetti AC180 and trying to input up to 60V at 8A into it.
Thank you
Thank you
Limiting solar voltage to 60V at 500W
- Thread starter Holdontight
- Start date
You may use a step-down module. In Aliexpress there many.
Step-down module is a very easy way to supply a current at a voltage no higher than the supplied.
The nominal power of the module will limit the current or you may purchase one with current regulation for some extra dollars.
https://es.aliexpress.com/item/1005...25c56044d03ab195e3615455980&afSmartRedirect=y
Step-down module is a very easy way to supply a current at a voltage no higher than the supplied.
The nominal power of the module will limit the current or you may purchase one with current regulation for some extra dollars.
https://es.aliexpress.com/item/1005...25c56044d03ab195e3615455980&afSmartRedirect=y
efficientPV
Solar Addict
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You will lose everything you gain with a step down module. Just what are your panels. I would guess they put out more than that open circuit.
Texas-Mark
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I believe he does not want to exceed the max PV input voltage of the Bluetti, so any loss would be better than cooking the unit.
efficientPV
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I know how to do it and that is what he wants. It is never going to work with someone who buys before they understand what they are doing.
Then what about a DC-DC buck boost converter with current limiter?
I have one and it can transform a DC voltage into a lower or higher voltage while providing a current from 0 to 5A with 0,001 accuracy.
Problem is that mine is only for 80W, but there should be for 500W.
Example:
https://es.aliexpress.com/i/1005005070334058.html
I have one and it can transform a DC voltage into a lower or higher voltage while providing a current from 0 to 5A with 0,001 accuracy.
Problem is that mine is only for 80W, but there should be for 500W.
Example:
https://es.aliexpress.com/i/1005005070334058.html
Holdontight
New Member
Thank you
Holdontight
New Member
Thank you
efficientPV
Solar Addict
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With a buck converter it will no longer be MPPT. These all in ones are a bit of a scam. They always spec an input voltage and current that can't be obtained. They rely on you not being able to meet it. If you could find a panel that matched the specs, the unit would burn up.
In my case I got 73W out of the 80W advertised.
If I used the maximum input voltage the unit can take and output the maximum voltage the unit can offer, I'd get much closer to those 80W.
So indeed, If you want 500W, get a buck for 600-800W. Then the overheating will be more balanced and you'll comfortably reach your 500W target.
zanydroid
Solar Wizard
How can you be so confident that your results are scalable?
You could operate well outside the maximum power point of the 500W panel and still max out the 80W buck converter.
If you are correct why do people even implement MPPTs?
If you want to do voltage conversion off a solar panel you need to get a buck or buck boost DC DC converter with MPPT control. Basically a DC optimizer. These are floating around on AliExpress in various configs. At present I don’t believe folks outside China have common access to the tunable ones.
pollenface
Solar Addict
Last time i plugged a buck into an mppt, it was destroyed in about 10 seconds ?
ShaneC
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Tell us your situation and the problem you're trying to solve, there's possibly a better solution here.
ShaneC
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Just read through your previous thread. It sounds like you're concerned at the low current level at 40V. That's probably just down to the time of year and poor light.
I assume the current of 5.5A is with all your series connected in parallel?
For reference I have 2.5kw of panels that yesterday produced 500wh of power. Winter!
I assume the current of 5.5A is with all your series connected in parallel?
For reference I have 2.5kw of panels that yesterday produced 500wh of power. Winter!
Holdontight
New Member
Thanks. I'm using Renogy 100w panels with an open circuit of just over 21V. Unfortunately this is just over the 60V input limit of the Bluetti AC180. I was hoping the 60ft of cable would have enough of a voltage drop to work, but that's not the case.
Later in the day I'm going to reconfigure my solar array for 2 panels in series at just over 40V and will have several parallel strings to help on cloudy days. I'll just have to accept the max 375watt input limit of the AC180
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