Forum Replies Created
But R&J’s rig is not your circus, not your monkeys. What’s your beef? Next thing you’ll be giving people crap about what they use their power for. Give it a rest.
What’s my beef? I don’t think you can beat a nice stew with dumplings especially on those sub 10degC days when your lithium batteries won’t charge. If too many people have too much solar power it is just going to suck all the energy out of the sun and make it go out. Then where will we be? I was just getting used to the higher temperatures from global warming which is another good reason to be burning more oil. Small solar is the way to go for sure. We need the sun to keep burning. :Silly: :Sun: :Love:
[quote quote=52405]We are 1070 watts and 8-6 volt T-105’s 900 ah’s.
[quote quote=52403]Hi Flyingppg yes I am insane LOL.
these rigs are our homes , with the charge controller I found it was the cloud effect that was causing a problem and I might need to add Another Solar charge controller might have too much power.
I’m hearing that you can never have too much power it seems. Like a flat screen TV it can never be too large. :bye:
Hello Jerry and Martha, it depends on the sun you have but if that is good generally a 150w panel and a couple of batteries will keep up with low energy lighting, charging your phones, a bit of laptop use and a little TV nothing more. If you are running a microwave, fridge, leaving your inverter on all the time then you need to spec up a lot! If you are running your generator for 2 hours a day that’s a lot of power and if you want to get off the generator then unless you want to install a lot of panels then you need to change how you live. Personally I live carefully but I only have a small roof space anyway. Richard
Hello Jeff, that’s insane! Did you ever find out why your charge controller was struggling to find it’s maximum power point and running up and down the VI curve all the while? Didn’t seem right to me. Nice off road electric bikes too! It’s rare to see even a single large 60 element panel on a vehicle over here. You’re all doing solar on a completely different scale.
Hello Eddie and Eileen, 1500 watts! Maybe 6 x 250 watt panels, that’s 5m x 2m of clear roof space just to fit the panels? What batteries do you have? I don’t use power like that at home. What are you driving, must be a bus? What are you powering, must be a steel foundry? :Big-Grin: :Cool:
We’re planning on joining you next year from about May 19 and I’ve been really enjoying the love your rv blog as part of making plans to ship our motorhome across the pond on a roro ship to Halifax, NS and found the forums from that.
We’re in a seemingly modest 6.5m (21.5ft) coach built, ci carioca 656, and until I started needing to charge our electric bike batteries we managed, still with more power than we needed, with a single 100w panel for lighting, TV, laptops and phone charging and two 95ah 12v leisure batteries. I can’t imagine what you are doing with 15 times that much power. Since upgrading the bikes to electric I’ve upgraded to a single 265w watt panel for charging the bikes which now fills all the available roof space I have, and an Epever tracer 3210AN charge controller. I still manage to run the 130w fridge for a few hours a day with the excess power we would otherwise throw away and save a bit of propane as a result
We’ve been spoiled by the free camping, water, waste points, refuse bins and even electricity (not that we tend to bother with electric hook ups) everywhere in France, Spain and Portugal and the we won’t bother you if you don’t bother us attitudes in continental Europe generally and so slightly apprehensive as to what we will find in Canada and the US and how spread out and accessible those things may be? From reading it all seems very spread out from what we are used to.
We have 100ltr (26.5 us gal) water and a cassette toilet. We can stretch that out to a week generally as long as we can find somewhere to empty the toilet. We have (for us) 2 months of propane and never need electric hook up. 350 mile diesel fuel range.
We’re not full time but get at least 3 months and up to 8 months in the RV each year. We’re coming for a year to North America and considering near full time living and seeing some more of the world
Richard and Julie.
- This reply was modified 4 years, 1 month ago by Flyingppg.
Jeepers Doug, what are you wanting to power with that 800-900w of power on your roof? Blackpool illuminations? 😉 Given you sound unsure have you calculated the power you actually need? No point in over doing it. But that said you Americans do do everything much bigger over there.
Without question, if they will fit, go with the 300w panels. They are always much cheaper per watt and often for sale cheap as leftovers from a solar farm installation. *BUT* those panels will probably have a Voc of 38v or so and Vmpp of 32v or so. Check the label on the back of the panel. You will then *have* to run them into an MPPT charge controller (however I recommend to be using one anyway) like the Epever tracer 4210AN. If 600w is enough however for your needs get two big panels and wire them in series and you well have lower cable losses. Put the charge controller next to your batteries on short thick cables. Make sure you have enough batteries because you could be charging them at up to 40 amps, maybe more, (up a big cold mountain on a windy very sunny day).July 6, 2018 at 3:05 am in reply to: Wiring my solar panels, charge controler, batteries, etc #52378
Hi, the problem in your system, and from what I read in most of the starter kits on the market, is your charge controller. You are using a PWM charge controller which is very inefficient. You may be throwing away 20-30% of your power with that charge controller, almost a whole panel, and making them run hotter too which increases the losses further. You also, as you figured out, need thicker wires if you are going to be dragging the voltage down to 13-15v with pwm charge controller to charge your batteries. Given your longish cable run, connect your 18v panels in series (72v) run it (still at 5 amps) into an MPPT charge controller like the Epever tracer ($100 on eBay), the 3210AN is right for your 400w of panels. A single set of 4mm cables will be OK although obviously the thicker the better and with a 6m run I’d use 6mm. Put the charge controller as close to your batteries as you can on short big thick cables, 10mm or so. Running higher voltages from your panels is how to minimise your cable losses.
I’m generally baffled as to why all you Americans with your enormous RV’s are still using 18v panels on PWM charge controllers. You get a lot more bang for your buck with the big 60 element 36v panels but of course then you absolutely must use an MPPT charge controller.
Kind regards. Richard