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Search took 0.01 seconds. Search: Posts Made By: booster
Forum: Electrical | Charging, Systems, Solar and Generators 05-05-2015, 07:57 PM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

We had really good sun today, so I moved the van onto the most level area to check some more.

I would have expected to get the most output when the panel was at the max power voltage rated volts...
Forum: Electrical | Charging, Systems, Solar and Generators 05-05-2015, 01:05 AM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

It is very interesting that your readings that are at the max output, like the ones with the load, and the early battery charging are all just about right at 85 watts at the output of the controller....
Forum: Electrical | Charging, Systems, Solar and Generators 05-04-2015, 09:57 PM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

That is an easy to use calculator, for sure. I don't understand for sure why he gives the expected output in amps. When you do the conversions and compare it to the other calculator, it appears he...
Forum: Electrical | Charging, Systems, Solar and Generators 05-04-2015, 12:48 AM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

If you are trying to see what the panels are putting out, I would use the panel output/controller input voltage and amps, if you have both like I do. With a PWM controller your amps in and out...
Forum: Electrical | Charging, Systems, Solar and Generators 05-03-2015, 06:51 PM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

It is crazy how stuff doesn't like to play well together.

We had a couple of odd things happen with our solar on the last little trip, which was first with the 300 watts and running the coach...
Forum: Electrical | Charging, Systems, Solar and Generators 05-03-2015, 01:44 AM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

You may be getting into an issue where the panels mismatch enough that one panel is actually consuming power from the other. Grape told me that the rule of thumb is to make sure they have the same...
Forum: Electrical | Charging, Systems, Solar and Generators 05-02-2015, 01:46 PM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

Made sense as soon as I saw the picture of the controller. When I was messing around with getting an ammeter for alternator to coach, I learned that only analog meters (or inductive) will work on...
Forum: Electrical | Charging, Systems, Solar and Generators 05-02-2015, 01:25 PM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

Does the shared negative wire check to van and battery negative? I would imagine it does. They may have used the chassis for the negative of the solar to save a wire from the roof. At least on the...
Forum: Electrical | Charging, Systems, Solar and Generators 05-01-2015, 01:22 AM
Replies: 19
Views: 4,191
Posted By booster
Re: MPPT or PWM for older panels in parallel?

That is a real good question. Not only do you have a year built mismatch, but also a size mismatch. You may also have design type (poly or mono) mismatch, and a number of cells mismatch. Yowser!
...
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