High Power Cycles Solar panels

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High Power Cycles Solar panels

Postby Electro-Fox » Mon Feb 13, 2017 11:32 pm

Hi,
Have any of you bought a folding panel setup from HPC High Power Cycles? http://www.hi-powercycles.com/portable- ... hargers-1/
They seem to be a very good system and they build a converter to match your battery voltage. I have a Bosch mid drive with 2 500 watt 36 volt batteries and Bosch says you can only use their chargers. But if the panels are the same output as the charger (voltage/amps) you should be fine right?

Thanks in advance...
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Re: High Power Cycles Solar panels

Postby neptronix » Tue Feb 14, 2017 12:32 am

I'm sure those folding panels are not very popular. They are probably the most expensive solar panel you could ever buy, on a watts per dollar basis.

For $1100, you can get a 120 watt panel that is portable. Whereas i can find a stationary 120 watt solar panel kit for around $125-$200 fairly easy.. why not, for the same price, install 500-700 watts of solar at your home, including battery storage, charge controller etc for the same price, and charge your bike much faster at home?

Versus.. a very expensive solar panel that can get you 120 watt hours into your battery over a period of 1 hour at the very best. How often are you leaving your bike + a $1100 solar panel outside? This makes sense if you are camping and have long stretches of time where you can just hang out and wait for a charge... otherwise, i don't see where it would be very useful to have one of these things.

Don't know about your bosch question, but there is probably a way to hack that.
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Re: High Power Cycles Solar panels

Postby rborger73 » Tue Feb 14, 2017 1:18 am

If they were reasonably priced I would like having them. Super light, folds up small enough to carry without too much fuss. Would be great to have on ebike touring trips. If you got stuck too far from an outlet, worst case scenario you spend a day or two camping to charge up enough to get to back to civilization. I think within another 2 years there should be some reasonable options similar.
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Re: High Power Cycles Solar panels

Postby Electro-Fox » Sat Feb 18, 2017 12:22 am

I want to use it to charge while camping and would be at the campsite for days at a time. This would be a cross-country trip, and so the home thing is not applicable. I want to charge an ebike, which uses 36 volt batteries. I have looked into all kinds of solar panels but there just does not seem to be anything that will do what High Power Cycles says their panels can do. The dealer that sells ebikes had the following comment.

The idea of charging your batteries with a solar panel isn't really a viable solution with any quality E-Bike battery, These batteries are high capacity and have been designed to charge most effectively when using the provided charger witch requires 120v at 15amps (standard home outlet). This amount of power would require an extremely large Solar panel set up. Solar panels can not be hooked up directly to any E-Bike battery, you would have need to store the energy via capacitors and have it converted to a 120v 15amp AC so that you could use the charger provided. Bear in mind all Quality E-Bikes use batteries and chargers that work together exclusively using battery management systems.

I don't know who is right...
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Re: High Power Cycles Solar panels

Postby rborger73 » Sat Feb 18, 2017 12:28 am

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Re: High Power Cycles Solar panels

Postby neptronix » Sat Feb 18, 2017 2:35 am

Electro-Fox wrote: The dealer that sells ebikes had the following comment.

The idea of charging your batteries with a solar panel isn't really a viable solution with any quality E-Bike battery, These batteries are high capacity and have been designed to charge most effectively when using the provided charger witch requires 120v at 15amps (standard home outlet). This amount of power would require an extremely large Solar panel set up. Solar panels can not be hooked up directly to any E-Bike battery, you would have need to store the energy via capacitors and have it converted to a 120v 15amp AC so that you could use the charger provided. Bear in mind all Quality E-Bikes use batteries and chargers that work together exclusively using battery management systems.

I don't know who is right...


LOL.. that kind of response is just blowing smoke up your ass from someone who does not understand what they are selling or dealing with. If i were you, i would not be buying anything from that dealer in the future.

120v x 15 amps = 1800 watts. He's saying that the minimum power requirement for a "quality ebike" ( what's the definition of that? ) is 1800 watts at the power source.. now tell me, have you ever seen a production ebike ship with a 1000w or higher charger?

I can't say i have seen such a thing.. 95% of OEM chargers i've seen are in the 100-500w range.

So, obviously you don't need a bare minimum of 1800w of solar panel output.

Also, the bike's batteries' BMS operates independently of the charger 99% of the time, so you just need a component that can convert the solar panel voltage to your bike battery voltage and limit the current, skipping the bike charger that wants 120v AC current altogether. There are some power supplies on the market that can do this. Capacitors are not necessarily required to buffer the charge, but would be helpful.


In my opinion, if you will be carrying solar panels on your bike, i would skip out on this idea entirely because the weight of the panels is going to require more energy under the bike's motion than they will produce. This is because the power density of solar panels is extremely low. We are talking 15-20lbs for a 100w panel that will create 100 watt hours per hour at absolute best if aimed optimally.

For 15lbs of weight, you could have 1.5kw-hrs of lithium battery.. you could build such a battery for around $1000 yourself. charge it up.. bring it to camp, and swap out your battery rather than even bother carrying a solar panel. Because the HPC solar panel is so wildly expensive ( a standard 100w solar panel can be had for $100 easily ), the battery is actually the more economical choice.. :lol:
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Re: High Power Cycles Solar panels

Postby neptronix » Sat Feb 18, 2017 2:45 am

Otherwise a cost effective rig for camping looks like this.. assuming you had a 600 watt hour battery and you had a 400 watt charger from your ebike that you wanted to use rather than a DC-DC that goes from the 12V of the lead acid battery straight to your ebike battery....
100w of solar panels ( $100-$150 )
100w charge controller ( ~$75 )
60 big marine lead acid battery for storing the charge ( $100 )
600w 12V to 120v inverter ( ~$100 )
+ your charger ( Free )

Total cost: about $400.

All this stuff would probably weigh 40-60lbs though.

You'd slowly collect energy from the sun into the marine battery, which would hold 600 watt hours and would take about 6-8 hours to charge to full from the panel. You'd hook the bike up to the AC inverter, which would mostly get it's power from the battery.. drain that battery to charge the bike battery, and the battery and solar panel combined could produce 700 watts for about an hour until the 12v battery is dead. This would work well, but is gonna be heavy to carry around.

The HPC charger works if you're willing to leave your bike plus the panel out in the sun for many hours to recharge. I'd rather let a solar panel and battery accumulate energy so that my charge time off the sun is very short.. ideally 30 minutes, rather than the 6-ish hours you're probably looking at for the HPC panel ( i have no idea how big your battery is, but you can do the calcs )
Last edited by neptronix on Sat Feb 18, 2017 2:52 am, edited 1 time in total. View post history.
My first major build: 8T MAC motor on a Trek 4500.
The new all-arounder: Leafmotor 1500w on a Turner O2 full suspension.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB

"The best time to plant a tree was 20 years ago. The second best time is now."- Chinese Proverb
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Re: High Power Cycles Solar panels

Postby amberwolf » Sat Feb 18, 2017 2:55 am

Electro-Fox wrote: provided charger witch requires 120v at 15amps

Must be one big heavy charger, at 1800W. I have Meanwells that are the size of a trade paperback and a lot heavier (7-8lbs each?), that take in about 840w at 120vac 7a, and output up to 11a at 58vdc (638w), about 75% efficient I think.

Must also be a heck of a battery, being able to be charged at such high current: assuming even just 75% charger efficiency, that would still be 1367w at the dc side. Say it's 58v output (to compare with the 14s EIG packs I charge with the MWs), then that's a 23A output into the battery.

Not a lot of ebike batteries would like to be charged at 23A, "quality" or not. ;)

In some of them the BMS would cook at a quarter that charge current.

If it was a 36v pack (like 42v full), then it would be more like 32A charge current.

Those are just maximums the charger *could* put out, not that it necessarily would for teh whole charge...but if the pack was empty and the charger was limted only to that level, it would start the charge at that current, until the pack was full enough to lower the current draw from the charger.


So I think that whatever seller it is you're quoting there doesn't really have much idea what they've got, how it works, or how good or bad their stuff is compared to anyone else. ;)


Edit: neptronix replied while I was typing with basically what I was trying to say. :lol:
Last edited by amberwolf on Sat Feb 18, 2017 2:56 am, edited 1 time in total. View post history.
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Re: High Power Cycles Solar panels

Postby amberwolf » Sat Feb 18, 2017 3:00 am

BTW, if you ignore all the extraneous posts in it, there are a lot of good posts abotu how to do what you want in teh Solar Charging an Ebike thread, along with a few others if you just look up "solar" in titles and display by thread.
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Re: High Power Cycles Solar panels

Postby Punx0r » Sat Feb 18, 2017 10:57 am

Electro-Fox wrote:
The idea of charging your batteries with a solar panel isn't really a viable solution with any quality E-Bike battery, These batteries are high capacity and have been designed to charge most effectively when using the provided charger witch requires 120v at 15amps (standard home outlet). This amount of power would require an extremely large Solar panel set up. Solar panels can not be hooked up directly to any E-Bike battery, you would have need to store the energy via capacitors and have it converted to a 120v 15amp AC so that you could use the charger provided. Bear in mind all Quality E-Bikes use batteries and chargers that work together exclusively using battery management systems.

I don't know who is right...


If you apply a filter to this dealer's statement it's almost right. Sales people usually get the gist of something technical but don't have a full understanding. Many lay people think a solar charge is something the size a sheet of A4 paper and greatly underestimate the capacity of a decent ebike battery. I'd guess the 120V/15A refers to "wall outlet", meaning 120V AC and capable of supporting a high inrush current. Even a 300 or 500W charger does require a "very large" (perhaps up to 1000W-rated) solar panel by many people's reckoning. It is true you can't connect the battery charger direct to the solar panel, nor the panel directly to the battery/BMS. The part about capacitors is odd, but I've found some DC-input SMPS wouldn't start when powered by a solar panel due to the inrush current requirement. It was only a ~5W load and 20W of panel wouldn't do it, but a 10W panel and a small electrolytic capacitor did the trick.
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Re: High Power Cycles Solar panels

Postby bobc » Tue Feb 21, 2017 1:46 pm

A suitably specced PV array makes a pretty good battery charger, wired straight to the battery; it inherently current limits during the bulk phase and if you put a series voltage regulator in line it would stop when it got to the right voltage (easy to do with e.g. LM317). Not totally ideal but reasonable.
The problem with this incredibly simple arrangement is that goodness only knows what's going on in the BMS in your battery box.....
And, of course, the many numpty ways of getting something slightly wrong and setting fire to the batteries or at least voiding yr warranty.
But a PV array is the quintessential "current controlled power source"!

PS note the sun is getting brighter, but not very fast :)
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